subject:(Polarimetric)

1. Clancy, Carl. Assessing The Utility of Passive Optical Polarimetric Observations for the Characterization of Resident Space Objects.

Degree: MSc (MS/Ma??trise ??s sciences), Physics/Physique, 2016, Royal Military College of Canada

URL: http://hdl.handle.net/11264/941

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The protection and management of valuable Earth orbits and operational satellites for military, commercial and research objectives is widely recognised as a task of urgency… (more)

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The protection and management of valuable Earth orbits and operational satellites for military, commercial and research objectives is widely recognised as a task of urgency and complexity. A critical component of this task is the tracking, characterization and identification of these active satellites as well as the space debris objects that pose a threat to them. As such advances in methods and technologies to improve these functions are constantly being investigated. One such broad method being employed to enhance space situational awareness (SSA) is the analysis of sunlight reflected from Earth-orbiting satellites. There are a number of studies that have focussed on studying variations in the intensity to learn more about a satellite???s operational status and activity however there is very little research on how the polarization of the reflected light could be used to gain additional knowledge about the reflecting body. To understand the utility of doing so as a means of characterizing satellites and space debris objects, an experiment was designed and conducted to gain insight into the trends of relative reflective polarimetric behaviors of some common spacecraft construction materials. For this thesis, five material samples were studied: two types of triple-junction photovoltaic cells, a bare 6061-T6 aluminum panel and a white-coated aluminum panel. The samples were mounted on a goniometer in which the illumination and reflection angles could be precisely controlled. The samples were then illuminated with a collimated unpolarised white light meant to simulate the Sun. The reflected light from the sample was then analysed using a dichroic linear polariser and a charge-coupled device (CCD) sensitive to optical wavelength light. From these measurements, the Stokes parameters were determined and the degree of linear polarisation and angle of polarisation calculated. The resulting values were plotted to allow a qualitative assessment of the trends in the polarimetric characteristics of each material with respect to illumination and observation geometries. The findings from this research project yielded two significant outcomes. First, the results provide a general understanding of how the polarisation trends of the reflected light vary as the illumination and observational geometry is changed. Second, the polarisation trends differed between samples for a given illumination and observational geometry. It can be concluded from these results that studying the polarimetric characteristics of light reflected from resident space objects can aid in their characterization and ultimately contribute to the advancement of gaining and maintaining SSA.

La protection et gestion d'orbites et de satellites op??rationels ?? des fins militaires, commercialles, et de recherche sont des t??ches reconnues comme ??tant urgentes et complexes. Un ??l??ment essentiel de cette t??che est le suivi, la caract??risation et l'identification de ces satellites ainsi que les d??bris spatiaux qui constituent une menace pour eux. ?? ce titre,…

Advisors/Committee Members: Royal Military College of Canada / Coll??ge militaire royal du Canada, B??dard, Donald, Wade, Gregg.

Subjects/Keywords: Space; Observations; Passive; Polarimetric; Characterization

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APA (6^th Edition):

Clancy, C. (2016). Assessing The Utility of Passive Optical Polarimetric Observations for the Characterization of Resident Space Objects. (Masters Thesis). Royal Military College of Canada. Retrieved from http://hdl.handle.net/11264/941

Chicago Manual of Style (16^th Edition):

Clancy, Carl. “Assessing The Utility of Passive Optical Polarimetric Observations for the Characterization of Resident Space Objects.” 2016. Masters Thesis, Royal Military College of Canada. Accessed January 22, 2021. http://hdl.handle.net/11264/941.

MLA Handbook (7^th Edition):

Clancy, Carl. “Assessing The Utility of Passive Optical Polarimetric Observations for the Characterization of Resident Space Objects.” 2016. Web. 22 Jan 2021.

Vancouver:

Clancy C. Assessing The Utility of Passive Optical Polarimetric Observations for the Characterization of Resident Space Objects. [Internet] [Masters thesis]. Royal Military College of Canada; 2016. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/11264/941.

Council of Science Editors:

Clancy C. Assessing The Utility of Passive Optical Polarimetric Observations for the Characterization of Resident Space Objects. [Masters Thesis]. Royal Military College of Canada; 2016. Available from: http://hdl.handle.net/11264/941

Colorado State University

2. Thompson, Elizabeth Jennifer. Development of a polarimetric radar based hydrometeor classification algorithm for winter precipitation.

Degree: MS(M.S.), Atmospheric Science, 2012, Colorado State University

URL: http://hdl.handle.net/10217/72363

► The nation-wide WSR-88D radar network is currently being upgraded for dual-polarized technology. While many convective, warm-season fuzzy-logic hydrometeor classification algorithms based on this new suite… (more)

▼ The nation-wide WSR-88D radar network is currently being upgraded for dual-polarized technology. While many convective, warm-season fuzzy-logic hydrometeor classification algorithms based on this new suite of radar variables and temperature have been refined, less progress has been made thus far in developing hydrometeor classification algorithms for winter precipitation. Unlike previous studies, the focus of this work is to exploit the discriminatory power of polarimetric variables to distinguish the most common precipitation types found in winter storms without the use of temperature as an additional variable. For the first time, detailed electromagnetic scattering of plates, dendrites, dry aggregated snowflakes, rain, freezing rain, and sleet are conducted at X-, C-, and S-band wavelengths. These physics-based results are used to determine the characteristic radar variable ranges associated with each precipitation type. A variable weighting system was also implemented in the algorithm's decision process to capitalize on the strengths of specific dual-polarimetric variables to discriminate between certain classes of hydrometeors, such as wet snow to indicate the melting layer. This algorithm was tested on observations during three different winter storms in Colorado and Oklahoma with the dual-wavelength X- and S-band CSU-CHILL, C-band OU-PRIME, and X-band CASA IP1 polarimetric radars. The algorithm showed success at all three frequencies, but was slightly more reliable at X-band because of the algorithm's strong dependence on specific differential phase. While plates were rarely distinguished from dendrites, the latter were satisfactorily differentiated from dry aggregated snowflakes and wet snow. Sleet and freezing rain could not be distinguished from rain or light rain based on polarimetric variables alone. However, high-resolution radar observations illustrated the refreezing process of raindrops into ice pellets, which has been documented before but not yet explained. Persistent, robust patterns of decreased correlation coefficient, enhanced differential reflectivity, and an inflection point around enhanced reflectivity occurred over the exact depth of the surface cold layer indicated by atmospheric soundings during times when sleet was reported at the surface. It is hypothesized that this refreezing signature is produced by a modulation of the drop size distribution such that smaller drops preferentially freeze into ice pellets first. The melting layer detection algorithm and fall speed spectra from vertically pointing radar also captured meaningful trends in the melting layer depth, height, and mean correlation coefficient during this transition from freezing rain to sleet at the surface. These findings demonstrate that this new radar-based winter hydrometeor classification algorithm is applicable for both research and operational sectors. Advisors/Committee Members: Rutledge, Steven A. (advisor), Dolan, Brenda (committee member), Chandrasekar, V. (committee member), van den Heever, Susan (committee member).

Subjects/Keywords: winter; algorithm; radar; polarimetric

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Thompson, E. J. (2012). Development of a polarimetric radar based hydrometeor classification algorithm for winter precipitation. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/72363

Chicago Manual of Style (16^th Edition):

Thompson, Elizabeth Jennifer. “Development of a polarimetric radar based hydrometeor classification algorithm for winter precipitation.” 2012. Masters Thesis, Colorado State University. Accessed January 22, 2021. http://hdl.handle.net/10217/72363.

MLA Handbook (7^th Edition):

Thompson, Elizabeth Jennifer. “Development of a polarimetric radar based hydrometeor classification algorithm for winter precipitation.” 2012. Web. 22 Jan 2021.

Vancouver:

Thompson EJ. Development of a polarimetric radar based hydrometeor classification algorithm for winter precipitation. [Internet] [Masters thesis]. Colorado State University; 2012. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/10217/72363.

Council of Science Editors:

Thompson EJ. Development of a polarimetric radar based hydrometeor classification algorithm for winter precipitation. [Masters Thesis]. Colorado State University; 2012. Available from: http://hdl.handle.net/10217/72363

Rochester Institute of Technology

3. Flusche, Brian M. An Analysis of multimodal sensor fusion for target detection in an urban environment.

Degree: Chester F. Carlson Center for Imaging Science (COS), 2011, Rochester Institute of Technology

URL: https://scholarworks.rit.edu/theses/2972

► This work makes a compelling case for simulation as an attractive tool in designing cutting-edge remote sensing systems to generate the sheer volume of data… (more)

Subjects/Keywords: Multimodal fusion; Polarimetric sensing; Simulation; Target detection

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APA (6^th Edition):

Flusche, B. M. (2011). An Analysis of multimodal sensor fusion for target detection in an urban environment. (Thesis). Rochester Institute of Technology. Retrieved from https://scholarworks.rit.edu/theses/2972

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Flusche, Brian M. “An Analysis of multimodal sensor fusion for target detection in an urban environment.” 2011. Thesis, Rochester Institute of Technology. Accessed January 22, 2021. https://scholarworks.rit.edu/theses/2972.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Flusche, Brian M. “An Analysis of multimodal sensor fusion for target detection in an urban environment.” 2011. Web. 22 Jan 2021.

Vancouver:

Flusche BM. An Analysis of multimodal sensor fusion for target detection in an urban environment. [Internet] [Thesis]. Rochester Institute of Technology; 2011. [cited 2021 Jan 22]. Available from: https://scholarworks.rit.edu/theses/2972.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Flusche BM. An Analysis of multimodal sensor fusion for target detection in an urban environment. [Thesis]. Rochester Institute of Technology; 2011. Available from: https://scholarworks.rit.edu/theses/2972

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Penn State University

4. Loeffler, Scott David. Dual-polarization signatures in nonsupercell tornadic storms.

Degree: 2017, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/14344swl5295

► Tornadoes associated with nonsupercell storms present unique challenges for forecasters. These tornadic storms, although often not as violent or deadly as supercells, occur disproportionately during… (more)

▼ Tornadoes associated with nonsupercell storms present unique challenges for forecasters. These tornadic storms, although often not as violent or deadly as supercells, occur disproportionately during the overnight hours and the cool season, times when the public is more vulnerable. Additionally, there is significantly lower warning skill for these nonsupercell tornadoes compared to supercell tornadoes. Thus, these storms warrant further attention. This study utilizes dual-polarization WSR-88D radar data to analyze nonsupercell tornadic storms over a three-and-a-half-year period focused on the mid-Atlantic and southeastern United States. The analysis reveals three repeatable signatures: the separation of specific differential phase (KDP) and differential reflectivity (ZDR) enhancement regions owing to size sorting, the descent of high KDP values preceding intensification of the low-level rotation, and rearward movement of the KDP enhancement region prior to tornadogenesis. This study employs a new method to define the ``separation vector," comprising the distance separating the enhancement regions and the direction from the KDP enhancement region to the ZDR enhancement region, measured relative to storm motion. The median separation distance between the enhancement regions is found to be around 4 km and tends to maximize around the time of tornadogenesis. A preferred quadrant for separation direction is found to be between parallel to and 90 degrees to the right of storm motion. Furthermore, it is shown that, for a given separation distance, the storm-relative helicity increases as the separation direction increases from 0 degrees toward 90 degrees. Discussions on the implications of the other two signatures (i.e., descending high KDP values and rearward movement of KDP enhancement regions) are presented, although higher temporal resolution data are crucial for further analysis of these signatures. Advisors/Committee Members: Matthew Robert Kumjian, Thesis Advisor/Co-Advisor, Paul Markowski, Committee Member, Yvette Pamela Richardson, Committee Member.

Subjects/Keywords: Severe storms; Radar; Polarimetric radar; Tornadoes

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APA (6^th Edition):

Loeffler, S. D. (2017). Dual-polarization signatures in nonsupercell tornadic storms. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/14344swl5295

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Loeffler, Scott David. “Dual-polarization signatures in nonsupercell tornadic storms.” 2017. Thesis, Penn State University. Accessed January 22, 2021. https://submit-etda.libraries.psu.edu/catalog/14344swl5295.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Loeffler, Scott David. “Dual-polarization signatures in nonsupercell tornadic storms.” 2017. Web. 22 Jan 2021.

Vancouver:

Loeffler SD. Dual-polarization signatures in nonsupercell tornadic storms. [Internet] [Thesis]. Penn State University; 2017. [cited 2021 Jan 22]. Available from: https://submit-etda.libraries.psu.edu/catalog/14344swl5295.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Loeffler SD. Dual-polarization signatures in nonsupercell tornadic storms. [Thesis]. Penn State University; 2017. Available from: https://submit-etda.libraries.psu.edu/catalog/14344swl5295

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Sydney

5. Herron, Christopher Andrew. Advanced Radio Polarimetric Techniques for the Study of the Magnetised, Turbulent, Interstellar Medium .

Degree: 2017, University of Sydney

URL: http://hdl.handle.net/2123/17781

► Galactic processes, such as the formation of stars and the evolution of the Galactic magnetic field, are dependent on the turbulent motion of magnetised gas… (more)

Subjects/Keywords: Radio; Polarimetric; Magnetised; Turbulent; Interstellar; Medium

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APA (6^th Edition):

Herron, C. A. (2017). Advanced Radio Polarimetric Techniques for the Study of the Magnetised, Turbulent, Interstellar Medium . (Thesis). University of Sydney. Retrieved from http://hdl.handle.net/2123/17781

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Herron, Christopher Andrew. “Advanced Radio Polarimetric Techniques for the Study of the Magnetised, Turbulent, Interstellar Medium .” 2017. Thesis, University of Sydney. Accessed January 22, 2021. http://hdl.handle.net/2123/17781.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Herron, Christopher Andrew. “Advanced Radio Polarimetric Techniques for the Study of the Magnetised, Turbulent, Interstellar Medium .” 2017. Web. 22 Jan 2021.

Vancouver:

Herron CA. Advanced Radio Polarimetric Techniques for the Study of the Magnetised, Turbulent, Interstellar Medium . [Internet] [Thesis]. University of Sydney; 2017. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/2123/17781.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Herron CA. Advanced Radio Polarimetric Techniques for the Study of the Magnetised, Turbulent, Interstellar Medium . [Thesis]. University of Sydney; 2017. Available from: http://hdl.handle.net/2123/17781

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Oklahoma

6. Bukovcic, Petar. Polarimetric Measurements of Ice Pellets and Aggregated Snow.

Degree: PhD, 2017, University of Oklahoma

URL: http://hdl.handle.net/11244/52406

► The recent upgrade of the National Weather Service WSR-88D radar network to polarimetric capabilities provides the abundance of information about the precipitation microphysics. Even with… (more)

▼ The recent upgrade of the National Weather Service WSR-88D radar network to polarimetric capabilities provides the abundance of information about the precipitation microphysics. Even with the plethora of polarimetric measurements at our disposal, use of this essential information regarding the microphysical processes is underutilized. For example, there is no polarimetric relation for snow estimation. The focus of this study is to improve the existing state of polarimetric data usage for discrimination between the ice pellets and freezing rain if their occurrence is away from the radar (patchy, no radar-centric structure), and more importantly the development of the polarimetric relations for snow quantification. Observations and analysis of an ice-liquid phase precipitation event, collected with an S-band polarimetric KOUN radar and a two-dimensional video disdrometer in central Oklahoma are presented. Using the disdrometer measurements, precipitation is classified either as ice pellets or rain/freezing rain. The ice pellets were challenging to detect by looking at conventional polarimetric radar data due to the localized and patchy nature of the ice phase and occurrence close to the ground. In this study, a new, unconventional way of looking at polarimetric radar data is introduced: Slanted Vertical Profiles SVPs at low (0° - 1°) radar elevations. From the analysis of the localized and patchy structures using SVPs, the polarimetric refreezing signature, reflected in local enhancement in ZDR and reduction in ZH and ρhv, became much more evident. Model simulations of sequential drop freezing using Marshal-Palmer DSDs along with the disdrometer observations suggest that preferential freezing of small drops may be responsible for the refreezing polarimetric signature. Accurate measurements of snow amounts by radar are very difficult to achieve. The inherent uncertainty in radar snow estimates based on the radar reflectivity factor Z is caused by the variability of snow particle size distributions and snow particle density as well as large diversity of snow growth habits. In this study, a novel methodology for snow quantification based on the joint use of radar reflectivity Z and specific differential phase KDP is introduced. An extensive dataset of 2D video disdrometer measurements of aggregated snow in central Oklahoma is used to derive polarimetric relations for liquid-equivalent snowfall rate S and ice water content IWC in the forms of bivariate power-law relations. The physical basis of these relations is explained. Their multipliers are sensitive to variations in the width of the canting angle distribution, and to lesser extent particles’ aspect ratios and densities, whereas the exponents are practically invariant. This novel approach is tested against the S(Z) relation using snow disdrometer measurements in three geographical regions (Oklahoma, Colorado, and Canada). Similarly, the new approach is tested on polarimetric radar data at three localities, Oklahoma, Virginia, and Colorado. Polarimetric relations… Advisors/Committee Members: Zhang, Guifu (advisor), Zrnic, Dusan (advisor), Shapiro, Alan (committee member), Xue, Ming (committee member), Zhang, Yan (committee member).

Subjects/Keywords: Winter Precipitation Measurements; Disdrometer; Polarimetric Radar

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APA (6^th Edition):

Bukovcic, P. (2017). Polarimetric Measurements of Ice Pellets and Aggregated Snow. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/52406

Chicago Manual of Style (16^th Edition):

Bukovcic, Petar. “Polarimetric Measurements of Ice Pellets and Aggregated Snow.” 2017. Doctoral Dissertation, University of Oklahoma. Accessed January 22, 2021. http://hdl.handle.net/11244/52406.

MLA Handbook (7^th Edition):

Bukovcic, Petar. “Polarimetric Measurements of Ice Pellets and Aggregated Snow.” 2017. Web. 22 Jan 2021.

Vancouver:

Bukovcic P. Polarimetric Measurements of Ice Pellets and Aggregated Snow. [Internet] [Doctoral dissertation]. University of Oklahoma; 2017. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/11244/52406.

Council of Science Editors:

Bukovcic P. Polarimetric Measurements of Ice Pellets and Aggregated Snow. [Doctoral Dissertation]. University of Oklahoma; 2017. Available from: http://hdl.handle.net/11244/52406

University of Oklahoma

7. May, Ryan Michael. Estimating and Mitigating Errors in Dual-Polarization Radar Attenuation Correction.

Degree: PhD, 2014, University of Oklahoma

URL: http://hdl.handle.net/11244/13621

► Correction for rain attenuation is an important data quality issue when using data collected by radars operating at attenuating wavelengths, specifically C and X bands.… (more)

Subjects/Keywords: polarimetric radar; dual-polarization; attenuation; simulation

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

May, R. M. (2014). Estimating and Mitigating Errors in Dual-Polarization Radar Attenuation Correction. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/13621

Chicago Manual of Style (16^th Edition):

May, Ryan Michael. “Estimating and Mitigating Errors in Dual-Polarization Radar Attenuation Correction.” 2014. Doctoral Dissertation, University of Oklahoma. Accessed January 22, 2021. http://hdl.handle.net/11244/13621.

MLA Handbook (7^th Edition):

May, Ryan Michael. “Estimating and Mitigating Errors in Dual-Polarization Radar Attenuation Correction.” 2014. Web. 22 Jan 2021.

Vancouver:

May RM. Estimating and Mitigating Errors in Dual-Polarization Radar Attenuation Correction. [Internet] [Doctoral dissertation]. University of Oklahoma; 2014. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/11244/13621.

Council of Science Editors:

May RM. Estimating and Mitigating Errors in Dual-Polarization Radar Attenuation Correction. [Doctoral Dissertation]. University of Oklahoma; 2014. Available from: http://hdl.handle.net/11244/13621

University of Oklahoma

8. Putnam, Bryan. THE PREDICTION AND ASSIMILATION OF POLARIMETRIC RADAR DATA USING ENSEMBLE-BASED METHODS.

Degree: PhD, 2016, University of Oklahoma

URL: http://hdl.handle.net/11244/34807

► Accurately representing the microphysical state of precipitation using bulk microphysics schemes, including the hydrometeor particle size distributions (PSDs), is vital to improving convective-scale forecasts. In… (more)

▼ Accurately representing the microphysical state of precipitation using bulk microphysics schemes, including the hydrometeor particle size distributions (PSDs), is vital to improving convective-scale forecasts. In this dissertation, results will be presented from three related projects that combine the use of dual-polarimetric (dual-pol) radar observations and ensemble forecast methods to evaluate and improve the forecast model microphysical state. The dual-pol variables provide additional information on hydrometeor types and their PSDs compared to reflectivity (Z) alone. In the first project, simulated dual-pol variables from several members of the 2013 CAPS Storm Scale Ensemble Forecasts (SSEF) that use different microphysics schemes are compared to dual-pol observations. The microphysics schemes vary significantly and include single-moment (SM) WSM6, partially double-moment (DM) Thompson and WDM6, and fully DM Milbrandt and Yau and Morrison. Both a mesoscale convective system (MCS) and supercell case are considered due to the different patterns in the dual-pol variable fields unique to each case. Results show that the forecasts using the Morrison scheme and the Milbrandt and Yau scheme have patterns of high differential reflectivity (ZDR) indicative of size sorting that match similar patterns in the observations. The dual-pol variables also help highlight biases in the forecasts including the under-prediction of liquid water content and the over-prediction of particular hydrometeor types such as graupel. In the second project, probabilistic forecasts of simulated dual-pol variables are performed. Ensemble forecasts of a mesoscale convective system (MCS) from 9 May 2007 are initialized from ensemble Kalman filter (EnKF) analyses using both SM and DM microphysics schemes. Qualitative analysis of simulated ZDR shows that the DM experiment better represents the PSDs of the convective and stratiform precipitation regions, while the KDP fields show that the SM experiment over-forecasts liquid water content in the convective areas. Quantitative ensemble forecast verification methods using dual-pol variables are considered for the first time and reveal the challenges associated with evaluating dual-pol fields that have very fine-scale details. Finally, in the third project, dual-pol variables are assimilated using the EnKF and a DM microphysics scheme for two supercell cases: 10 May 2010 and 20 May 2013. For each case, both ZDR and KDP are assimilated in separate experiments in addition to Z and radial velocity (Vr) and compared to a control experiment that assimilates only Z and Vr. The results show that the simulated dual-pol fields in the analyses of the dual-pol experiments better represent documented polarimetric signatures, such as the ZDR arc, compared to the control experiment. Additionally, comparisons of model microphysical variables and mean mass diameter between the dual-pol and control experiments show that the dual-pol experiments have an improved microphysical state. For example, the mean mass… Advisors/Committee Members: Xue, Ming (advisor), Zhang, Guifu (advisor), Jung, Youngsun (committee member), Bluestein, Howard (committee member), Lakshmivarahan, S (committee member).

Subjects/Keywords: data assimilation; polarimetric radar; convective-scale modeling

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Putnam, B. (2016). THE PREDICTION AND ASSIMILATION OF POLARIMETRIC RADAR DATA USING ENSEMBLE-BASED METHODS. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/34807

Chicago Manual of Style (16^th Edition):

Putnam, Bryan. “THE PREDICTION AND ASSIMILATION OF POLARIMETRIC RADAR DATA USING ENSEMBLE-BASED METHODS.” 2016. Doctoral Dissertation, University of Oklahoma. Accessed January 22, 2021. http://hdl.handle.net/11244/34807.

MLA Handbook (7^th Edition):

Putnam, Bryan. “THE PREDICTION AND ASSIMILATION OF POLARIMETRIC RADAR DATA USING ENSEMBLE-BASED METHODS.” 2016. Web. 22 Jan 2021.

Vancouver:

Putnam B. THE PREDICTION AND ASSIMILATION OF POLARIMETRIC RADAR DATA USING ENSEMBLE-BASED METHODS. [Internet] [Doctoral dissertation]. University of Oklahoma; 2016. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/11244/34807.

Council of Science Editors:

Putnam B. THE PREDICTION AND ASSIMILATION OF POLARIMETRIC RADAR DATA USING ENSEMBLE-BASED METHODS. [Doctoral Dissertation]. University of Oklahoma; 2016. Available from: http://hdl.handle.net/11244/34807

University of Oklahoma

9. Mahale, Vivek. Analysis of the Dynamics and Microphysics of a Wet Downburst Case Using Dual-Polarization Radar Data.

Degree: PhD, 2019, University of Oklahoma

URL: http://hdl.handle.net/11244/319368

► A significant, wet downburst affected Norman, Oklahoma, on 14 June 2011. Surface winds in excess of 35 m/s (>80 mph) and hailstones in excess of… (more)

▼ A significant, wet downburst affected Norman, Oklahoma, on 14 June 2011. Surface winds in excess of 35 m/s (>80 mph) and hailstones in excess of 4 cm diameter occurred during the downburst. The polarimetric S-band (~11.09-cm wavelength) KOUN Weather Surveillance Radar-1988 Doppler (WSR-88D) and the rapid-scan X-band (~3-cm wavelength) polarimetric, Doppler radar (RaXPol) collected nearly simultaneous polarimetric radar data (PRD) of the downburst. The focus of this dissertation is the characterization and analysis of the dynamics and microphysics of the 14 June 2011 downburst and parent thunderstorm using various analysis methods. Analysis of the PRD from both KOUN and RaXPol radars are conducted using low-level plan position indicator (PPI) elevation scans and reconstructed range–height indicator (RHI) data. A hydrometeor classification algorithm (HCA) is applied to the KOUN PRD to understand the microphysical evolution of hydrometeors in the downburst. Dual-Doppler analysis is conducted with KOUN and the KTLX WSR-88D. Dual-frequency analysis and a comparison of the PRD are conducted between KOUN and RaXPol. Finally, a variational retrieval algorithm of rain microphysics is developed and applied to KOUN based on S-band parametrized polarimetric observation operators. Through the above analyses, an understanding of the structure and evolution of the downburst and its potential driving mechanism(s) is developed. It is found that graupel aloft transitioned to nearly all rain and hail mixture above the 0 °C level. Eventually, this large area of rain and hail mixture (i.e., mixed-phase precipitation) descended to the ground with some melting of the hail, causing the downburst. The downburst grew from a microburst at ~2.1 km horizontal scale to a macroburst at ~6.4 km in less than 7 min. As the downburst expanded, its near-surface horizontal winds intensified from 23 m/s to 42 m/s. Descending surges of mixed-phase precipitation cores aloft, indicated by a reduction in co-polar correlation coefficient (ρhv), provided a continued stream of precipitation loading and melting hail that may have aided in the continued expansion and intensity of the downburst. The unique, rapid-scan observations also captured the development of features such as a horizontal rotor, vertical vortices, multiple gust front heads, and an elevated nose on the leading edge of the gust front. The structure of the downburst is compared to the current conceptual model of a downburst and to 1-min Oklahoma Mesonet observations that were nearly collocated with the radar as well. Advisors/Committee Members: Zhang, Guifu (advisor), Xue, Ming (advisor), Bluestein, Howard (committee member), Jung, Youngsun (committee member), Zhang, Yan (committee member).

Subjects/Keywords: Polarimetric Radar; Downbursts; Microphysics; Variational Retrieval

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APA (6^th Edition):

Mahale, V. (2019). Analysis of the Dynamics and Microphysics of a Wet Downburst Case Using Dual-Polarization Radar Data. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/319368

Chicago Manual of Style (16^th Edition):

Mahale, Vivek. “Analysis of the Dynamics and Microphysics of a Wet Downburst Case Using Dual-Polarization Radar Data.” 2019. Doctoral Dissertation, University of Oklahoma. Accessed January 22, 2021. http://hdl.handle.net/11244/319368.

MLA Handbook (7^th Edition):

Mahale, Vivek. “Analysis of the Dynamics and Microphysics of a Wet Downburst Case Using Dual-Polarization Radar Data.” 2019. Web. 22 Jan 2021.

Vancouver:

Mahale V. Analysis of the Dynamics and Microphysics of a Wet Downburst Case Using Dual-Polarization Radar Data. [Internet] [Doctoral dissertation]. University of Oklahoma; 2019. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/11244/319368.

Council of Science Editors:

Mahale V. Analysis of the Dynamics and Microphysics of a Wet Downburst Case Using Dual-Polarization Radar Data. [Doctoral Dissertation]. University of Oklahoma; 2019. Available from: http://hdl.handle.net/11244/319368

Penn State University

10. Tobin, Dana Marie. Polarimetric and Thermodynamic Observations of Hydrometeor Refreezing.

Degree: 2016, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/29519

► Recent studies document a polarimetric radar signature of refreezing. The signature is characterized by a low-level enhancement in differential reflectivity (ZDR) and decrease in co-polar… (more)

▼ Recent studies document a polarimetric radar signature of refreezing. The signature is characterized by a low-level enhancement in differential reflectivity (ZDR) and decrease in co-polar correlation coefficient (ρhv) within a region of decreasing radar reflectivity factor at horizontal polarization (ZH) toward the ground. The signature is examined for the first time in conjunction with crowdsourced precipitation reports and thermodynamic data. Time-averaged quasi-vertical profiles (QVPs) retain the most prominent features of the signature, which appear to line up with certain thermodynamic features among cases. The height at which the low-level ZDR values begin to increase towards the ground corresponds to wet-bulb temperatures (Tw) = -5 °C, and may indicate the height at which freezing begins. Humidity profiles suggest the local generation of anisotropic crystals growing at the expense of small liquid drops via evaporation and vapor deposition. These crystals may promote the refreezing of fully melted hydrometeors via contact nucleation. Some regions suggest the rapid cooling of hydrometeors, that may act to freeze drops quickly and reduce their fall speeds, which may be responsible for producing an enhancement in ZH near the top of the refreezing layer (RFL) present in some cases. The evolution of the signature is also examined during three winter storms in which surface precipitation type transitions from ice pellets to freezing rain. Synoptic analyses reveal similarities among these cases in the location of nearby surface features associated with an approaching low-pressure system, namely an advancing warm front and an inverted surface trough, and strong warm-air advection aloft at 850 hPa and weak temperature advection at the surface. During transition events, the refreezing signature descends monotonically and intersects the ground at the time of the transition. A simple method for forecasting this changeover time from quasi-vertical profiles (QVPs) of polarimetric radar data is developed and compared to crowdsourced precipitation reports and surface precipitation types derived from Rapid Refresh (RAP) model wet-bulb temperatures (Tw) and a recently developed background precipitation classification algorithm. This simple technique shows greater skill in predicting changeover times as compared to forecasts based on RAP Tw profiles. The repeatability of the refreezing signature’s descent in precipitation transition events from ice pellets to freezing rain suggests the potential for its use in operational settings. Advisors/Committee Members: Matthew Robert Kumjian, Thesis Advisor/Co-Advisor, Jerry Y Harrington, Thesis Advisor/Co-Advisor, Yvette Pamela Richardson, Thesis Advisor/Co-Advisor.

Subjects/Keywords: ice pellets; microphysics; refreezing; polarimetric; dual-polarization; radar; wet-bulb temperature

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APA (6^th Edition):

Tobin, D. M. (2016). Polarimetric and Thermodynamic Observations of Hydrometeor Refreezing. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/29519

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Tobin, Dana Marie. “Polarimetric and Thermodynamic Observations of Hydrometeor Refreezing.” 2016. Thesis, Penn State University. Accessed January 22, 2021. https://submit-etda.libraries.psu.edu/catalog/29519.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Tobin, Dana Marie. “Polarimetric and Thermodynamic Observations of Hydrometeor Refreezing.” 2016. Web. 22 Jan 2021.

Vancouver:

Tobin DM. Polarimetric and Thermodynamic Observations of Hydrometeor Refreezing. [Internet] [Thesis]. Penn State University; 2016. [cited 2021 Jan 22]. Available from: https://submit-etda.libraries.psu.edu/catalog/29519.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Tobin DM. Polarimetric and Thermodynamic Observations of Hydrometeor Refreezing. [Thesis]. Penn State University; 2016. Available from: https://submit-etda.libraries.psu.edu/catalog/29519

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Guelph

11. McKeown, Steven. Discrimination of Agricultural Land Management Practices using Polarimetric Synthetic Aperture RADAR.

Degree: MS, Department of Geography, 2012, University of Guelph

URL: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/3901

► This thesis investigates the sensitivity and separability of post-harvest tillage conditions using polarimetric Synthetic Aperture RADAR in southwestern Ontario. Variables examined include: linear polarizations HH,… (more)

Subjects/Keywords: Synthetic Aperture RADAR; Tillage; Image Classification; Polarimetric SAR; Agriculture; Crop Residue

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APA (6^th Edition):

McKeown, S. (2012). Discrimination of Agricultural Land Management Practices using Polarimetric Synthetic Aperture RADAR. (Masters Thesis). University of Guelph. Retrieved from https://atrium.lib.uoguelph.ca/xmlui/handle/10214/3901

Chicago Manual of Style (16^th Edition):

McKeown, Steven. “Discrimination of Agricultural Land Management Practices using Polarimetric Synthetic Aperture RADAR.” 2012. Masters Thesis, University of Guelph. Accessed January 22, 2021. https://atrium.lib.uoguelph.ca/xmlui/handle/10214/3901.

MLA Handbook (7^th Edition):

McKeown, Steven. “Discrimination of Agricultural Land Management Practices using Polarimetric Synthetic Aperture RADAR.” 2012. Web. 22 Jan 2021.

Vancouver:

McKeown S. Discrimination of Agricultural Land Management Practices using Polarimetric Synthetic Aperture RADAR. [Internet] [Masters thesis]. University of Guelph; 2012. [cited 2021 Jan 22]. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/3901.

Council of Science Editors:

McKeown S. Discrimination of Agricultural Land Management Practices using Polarimetric Synthetic Aperture RADAR. [Masters Thesis]. University of Guelph; 2012. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/3901

University of Adelaide

12. Morris, James Thomas Stewart. Polarimetric properties of radar echoes from features on the ocean surface.

Degree: 2004, University of Adelaide

URL: http://hdl.handle.net/2440/79322

► This thesis presents the results of an investigation of the polarimetric properties of radar echoes from features on the sea surface, including freely-propagating gravity and… (more)

▼ This thesis presents the results of an investigation of the polarimetric properties of radar echoes from features on the sea surface, including freely-propagating gravity and capillary waves, breaking waves and ship wakes. Analysis and interpretation of the data is based mainly on the Cloude-Pottier H/A/ᾱ decomposition of the coherence / covariance matrix. Variations in the distribution of polarimetric entropy, scattering alpha and anisotropy of radar echoes are examined in the in the H-ᾱ , H-A and H-A-ᾱ spaces to catergorise the dominant scattering mechanisms. First, a review of the concepts and theory of polarimetric scattering from point and distributed targets is given. A detailed examination of the theory and techniques developed to calibrate polarimetric radar systems follows, focussing on the need to calibrate in the field as opposed to the ideal laboratory environment. A new calibration scheme is described that employs a parabolic dish antenna with a dual linear feed horn with two delay lines to perform the radio metric callibration, while a rotating dihedral corner reflector is used to perform the phase callibration; this design achieves stable, accurate calibration to ±0.5 dB in magnitude and 4° in phase. Radar scattering from the sea surface is then discussed in the context of the hydrodynamic problem of describing the sea surface and the electromagnetic problem of finding an approximate solution to Maxwell's equations. The X-Bragg model is applied to predict variations in the polarimetric parameters for progressive and breaking waves. The problem of validating polarimetric measurements of the sea surface is discussed and the possibility of exploiting a quasi-deterministic surface, in the form of a Kelvin wake generated by a moving ship, is proposed and assessed by experiment. Investigations of the polarimetric characteristics of the near shore wave field are then reported and a comparison with the results predicted by the X-Bragg model given. Polarimetric wake measurements are analysed using (i) eigen-decomposition of the coherency matrix, and (ii) a novel method based on the distribution of the cross-polar nulls. These approaches are compared with the scattering predictions obtained using numerical wake prediction codes, combined with the Bragg scattering model. The application of wakes as a tool for studying highly nonlinear hydrodynamic processes is demonstrated using the interaction between the wake produced by a boat and ambient swell to initiate wave breaking events. Advisors/Committee Members: Anderson, Stuart (advisor), School of Electrical and Electronic Engineering (school).

Subjects/Keywords: polarimetric; radar; ocean surface; Bragg

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APA (6^th Edition):

Morris, J. T. S. (2004). Polarimetric properties of radar echoes from features on the ocean surface. (Thesis). University of Adelaide. Retrieved from http://hdl.handle.net/2440/79322

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Morris, James Thomas Stewart. “Polarimetric properties of radar echoes from features on the ocean surface.” 2004. Thesis, University of Adelaide. Accessed January 22, 2021. http://hdl.handle.net/2440/79322.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Morris, James Thomas Stewart. “Polarimetric properties of radar echoes from features on the ocean surface.” 2004. Web. 22 Jan 2021.

Vancouver:

Morris JTS. Polarimetric properties of radar echoes from features on the ocean surface. [Internet] [Thesis]. University of Adelaide; 2004. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/2440/79322.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Morris JTS. Polarimetric properties of radar echoes from features on the ocean surface. [Thesis]. University of Adelaide; 2004. Available from: http://hdl.handle.net/2440/79322

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

New Jersey Institute of Technology

13. Romano, Joao Miguel Mendes. Exploitation of infrared polarimetric imagery for passive remote sensing applications.

Degree: PhD, Electrical and Computer Engineering, 2013, New Jersey Institute of Technology

URL: https://digitalcommons.njit.edu/dissertations/389

► Polarimetric infrared imagery has emerged over the past few decades as a candidate technology to detect manmade objects by taking advantage of the fact… (more)

▼ Polarimetric infrared imagery has emerged over the past few decades as a candidate technology to detect manmade objects by taking advantage of the fact that smooth materials emit strong polarized electromagnetic waves, which can be remotely sensed by a specialized camera using a rotating polarizer in front of the focal plate array in order to generate the so-called Stokes parameters: S₀, S₁, S₂, and DoLP. Current research in this area has shown the ability of using such variations of these parameters to detect smooth manmade structures in low contrast contrast scenarios. This dissertation proposes and evaluates novel anomaly detection methods for long-wave infrared polarimetric imagery exploitation suited for surveillance applications requiring automatic target detection capability. The targets considered are manmade structures in natural clutter backgrounds under unknown illumination and atmospheric effects. A method based on mathematical morphology is proposed with the intent to enhance the polarimetric Stokes features of manmade structures found in the scene while minimizing its effects on natural clutter. The method suggests that morphology-based algorithms are capable of enhancing the contrast between manmade objects and natural clutter backgrounds, thus, improving the probability of correct detection of manmade objects in the scene. The second method departs from common practices in the polarimetric research community (i.e., using the Stokes vector parameters as input to algorithms) by using instead the raw polarization component imagery (e.g., 0°, 45°, 90°, and 135°) and employing multivariate mathematical statistics to distinguish the two classes of objects. This dissertation unequivocally shows that algorithms based on this new direction significantly outperform the prior art (algorithms based on Stokes parameters and their variants). To support this claim, this dissertation offers an exhaustive data analysis and quantitative comparative study, among the various competing algorithms, using long-wave infrared polarimetric imagery collected outdoor, over several days, under varying weather conditions, geometry of illumination, and diurnal cycles. Advisors/Committee Members: Edip Niver, Dalton Rosario, Venkataraman S. Swaminathan.

Subjects/Keywords: Polarimetric; Anomaly; Remote; Infrared; Detection; Sensing; Electrical and Electronics

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APA (6^th Edition):

Romano, J. M. M. (2013). Exploitation of infrared polarimetric imagery for passive remote sensing applications. (Doctoral Dissertation). New Jersey Institute of Technology. Retrieved from https://digitalcommons.njit.edu/dissertations/389

Chicago Manual of Style (16^th Edition):

Romano, Joao Miguel Mendes. “Exploitation of infrared polarimetric imagery for passive remote sensing applications.” 2013. Doctoral Dissertation, New Jersey Institute of Technology. Accessed January 22, 2021. https://digitalcommons.njit.edu/dissertations/389.

MLA Handbook (7^th Edition):

Romano, Joao Miguel Mendes. “Exploitation of infrared polarimetric imagery for passive remote sensing applications.” 2013. Web. 22 Jan 2021.

Vancouver:

Romano JMM. Exploitation of infrared polarimetric imagery for passive remote sensing applications. [Internet] [Doctoral dissertation]. New Jersey Institute of Technology; 2013. [cited 2021 Jan 22]. Available from: https://digitalcommons.njit.edu/dissertations/389.

Council of Science Editors:

Romano JMM. Exploitation of infrared polarimetric imagery for passive remote sensing applications. [Doctoral Dissertation]. New Jersey Institute of Technology; 2013. Available from: https://digitalcommons.njit.edu/dissertations/389

University of Victoria

14. Hobart, Geordie. A System of Mapping Historical Wildfire Events in the Boreal Forest using Polarimetric Radar.

Degree: Department of Computer Science, 2015, University of Victoria

URL: http://hdl.handle.net/1828/5966

► The boreal forest covers 11% of the earth’s land surface and contains 37 percent of the planet’s terrestrial carbon, which is more than the combined… (more)

▼ The boreal forest covers 11% of the earth’s land surface and contains 37 percent of the planet’s terrestrial carbon, which is more than the combined total of both the tropical and the temperate forests [1]. This estimate translates to 703 Pg of carbon with the vast majority contained within the organic soils and peat layers [2-4]. The western-north American boreal forest is a fire ecosystem [2, 5-7] where fires typically occur every 50 to 200 years [8, 9], allowing vast quantities of carbon to re-enter the atmosphere. Understanding and estimating past fire history and the related changes in carbon budget [3, 4, 7, 10] in this biome is of significant importance for climate researchers as they attempt to model for future changes in the planet’s climate [2, 4, 11-14]. Many techniques are available to remotely sense wildfires - using optical, thermal and passive microwave remote sensors - during and immediately after an event - although resolution and availability of images due to cloud cover can make these techniques operationally challenging. Radar remote sensing can provide a complement to these optical and passive microwave techniques, since radar is not affected by cloud cover and solar illumination levels. The Advanced Land Observatory Satellite (ALOS) operates a phased array L band synthetic aperture radar (PALSAR) and Canada’s Radarsat-2 contains a C-Band (SAR) instrument. These radar satellites can be used to detect information about the boreal forest environment including the effects of wildfire. Polarimetric radar is an emerging technology whose full potential is still being actively explored and discovered. More specifically, this research is ground-breaking since very little work has been performed investigating the relationship between polarimetric radar data and historical boreal wildfire events. This area of investigation is a complex marriage of forestry, geospatial information and radar engineering that requires an extensive array of data sets to facilitate analysis. This research has demonstrated that both PALSAR L-Band and Canada’s Radarsat-2 C-Band full polarimetric radars can be used to detect and classify wildfire scars within individual images. The boreal forest is a dynamic ecosystem where both the level of burn severity and the subsequent regeneration of the forest is affected by many factors that can vary widely across small distances. This work contributes to the understanding of the relationships between remotely sensed quad-pol radar signals and both the boreal ecosystem and how wildfire interacts in this environment. Advisors/Committee Members: Goodenough, D. (supervisor), Myrvold, W. J. (supervisor).

Subjects/Keywords: radar; boreal; wildfire; remote sensing; PALSAR; Radarsat; ALOS; polarimetric; forest; carbon

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APA (6^th Edition):

Hobart, G. (2015). A System of Mapping Historical Wildfire Events in the Boreal Forest using Polarimetric Radar. (Masters Thesis). University of Victoria. Retrieved from http://hdl.handle.net/1828/5966

Chicago Manual of Style (16^th Edition):

Hobart, Geordie. “A System of Mapping Historical Wildfire Events in the Boreal Forest using Polarimetric Radar.” 2015. Masters Thesis, University of Victoria. Accessed January 22, 2021. http://hdl.handle.net/1828/5966.

MLA Handbook (7^th Edition):

Hobart, Geordie. “A System of Mapping Historical Wildfire Events in the Boreal Forest using Polarimetric Radar.” 2015. Web. 22 Jan 2021.

Vancouver:

Hobart G. A System of Mapping Historical Wildfire Events in the Boreal Forest using Polarimetric Radar. [Internet] [Masters thesis]. University of Victoria; 2015. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/1828/5966.

Council of Science Editors:

Hobart G. A System of Mapping Historical Wildfire Events in the Boreal Forest using Polarimetric Radar. [Masters Thesis]. University of Victoria; 2015. Available from: http://hdl.handle.net/1828/5966

University of Adelaide

15. Pincus, Paul. Coherent Change Detection Under a Forest Canopy.

Degree: 2020, University of Adelaide

URL: http://hdl.handle.net/2440/123504

► Coherent change detection (CCD) is an established technique for remotely monitoring landscapes with minimal vegetation or buildings. By evaluating the local complex correlation between a… (more)

▼ Coherent change detection (CCD) is an established technique for remotely monitoring landscapes with minimal vegetation or buildings. By evaluating the local complex correlation between a pair of synthetic aperture radar (SAR) images acquired on repeat passes of an airborne or spaceborne imaging radar system, a map of the scene coherence is obtained. Subtle disturbances of the ground are detected as areas of low coherence in the surface clutter. This thesis investigates extending CCD to monitor the ground in a forest. It is formulated as a multichannel dual-layer coherence estimation problem, where the coherence of scattering from the ground is estimated after suppressing interference from the canopy by vertically beamforming multiple image channels acquired at slightly different grazing angles on each pass. This 3D SAR beamforming must preserve the phase of the ground response. The choice of operating wavelength is considered in terms of the trade-off between foliage penetration and change sensitivity. A framework for comparing the performance of different radar designs and beamforming algorithms, as well as assessing the sensitivity to error, is built around the random-volume-over-ground (RVOG) model of forest scattering. If the ground and volume scattering contributions in the received echo are of similar strength, it is shown that an L-band array of just three channels can provide enough volume attenuation to permit reasonable estimation of the ground coherence. The proposed method is demonstrated using an RVOG clutter simulation and a modified version of the physics-based SAR image simulator PolSARproSim. Receiver operating characteristics show that whilst ordinary single-channel CCD is unusable when a canopy is present, 3D SAR CCD permits reasonable detection performance. A novel polarimetric filtering algorithm is also proposed to remove contributions from the ground-trunk double-bounce scattering mechanism, which may mask changes on the ground near trees. To enable this kind of polarimetric processing, fully polarimetric data must be acquired and calibrated. Motivated by an interim version of the Ingara airborne imaging radar, which used a pair of helical antennas to acquire circularly polarised data, techniques for the estimation of polarimetric distortion in the circular basis are investigated. It is shown that the standard approach to estimating cross-talk in the linear basis, whereby expressions for the distortion of reflection-symmetric clutter are linearised and solved, cannot be adapted to the circular basis, because the first-order effects of individual cross-talk parameters cannot be distinguished. An alternative approach is proposed that uses ordinary and gridded trihedral corner reflectors, and optionally dihedrals, to iteratively estimate the channel imbalance and cross-talk parameters. Monte Carlo simulations show that the method reliably converges to the true parameter values. Ingara data is calibrated using the method, with broadly consistent parameter estimates obtained across flights. Genuine… Advisors/Committee Members: Gray, Douglas (advisor), Preiss, Mark (advisor), School of Electrical and Electronic Engineering (school).

Subjects/Keywords: synthetic aperture radar; interferometry; change detection; polarimetric calibration

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APA (6^th Edition):

Pincus, P. (2020). Coherent Change Detection Under a Forest Canopy. (Thesis). University of Adelaide. Retrieved from http://hdl.handle.net/2440/123504

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Pincus, Paul. “Coherent Change Detection Under a Forest Canopy.” 2020. Thesis, University of Adelaide. Accessed January 22, 2021. http://hdl.handle.net/2440/123504.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Pincus, Paul. “Coherent Change Detection Under a Forest Canopy.” 2020. Web. 22 Jan 2021.

Vancouver:

Pincus P. Coherent Change Detection Under a Forest Canopy. [Internet] [Thesis]. University of Adelaide; 2020. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/2440/123504.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Pincus P. Coherent Change Detection Under a Forest Canopy. [Thesis]. University of Adelaide; 2020. Available from: http://hdl.handle.net/2440/123504

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Melbourne

16. WEN, GUANG. A study on hydrometeor classification with polarimetric variables.

Degree: 2014, University of Melbourne

URL: http://hdl.handle.net/11343/42123

► Quality control algorithms are studied using data collected by the CP-2 S-band radar located in Brisbane, Queensland, Australia. A data smoothing method is introduced to… (more)

▼ Quality control algorithms are studied using data collected by the CP-2 S-band radar located in Brisbane, Queensland, Australia. A data smoothing method is introduced to eliminate data errors and fluctuations. Specific differential phase, K_dp, is estimated from the range derivative of propagation differential phase shift, φ_dp. A cluster-based algorithm for clutter cancellation is developed. Several standard statistical classification algorithms are investigated with aims to develop a rather rigorous classification to address problems of hydrometeor type classification with polarimetric variables. In order to develop hydrometeor classification algorithms based on probabilistic theory, three statistical methods are investigated, namely, a maximum likelihood (ML) method, a Markov random field - maximum a posterior (MRF-MAP) method and a decision tree - Bayesian (DTB) method. In the ML method, the likelihood conditional probability is constructed according to the characteristics of scattering and propagation effects of illuminated hydrometeors, and a Gaussian function is chosen as the base form of probability functions. In the MRF-MAP method, the prior probability is modelled as a smoothness prior in terms of Markov random field to consider the spatial correlations within the data. In the DTB method, locations and boundaries of the melting layers together with convection and stratiform classification are taken into account for hydrometeor classification. A novel approach involving prototypes defined via clustering techniques to interpret and analyse polarimetric signatures is described in an effort to develop a cluster-based classification algorithm for distinguishing and thus identifying hydrometeor types. An iterative procedure is developed using logic of case-based reasoning for each hydrometeor type and incorporating knowledge of polarimetric variables and understanding of the forms of precipitation to derive the prototypes. In this procedure, the prototypes for different hydrometeor types are generated using an \lq\lq Expectation-Maximisation\rq\rq (EM) clustering technique based on Gaussian mixture models, in which the prototypes are modelled as Gaussian distributions derived by the distributions of the clusters, and the underlying probability density function (PDF) for each hydrometeor type is modelled as a Gaussian mixture composed by these prototypes. The PDFs obtained in this way are compared with boundaries and thresholds used in a fuzzy-logic method from the literature, which are largely based on scattering calculations. The results show that this proposed approach facilitates the discrimination of hydrometeor types. The identified prototypes and the constructed PDFs could be used to build reliable and robust algorithms for hydrometeor type classification. We present two new algorithms for hydrometeor classification based on clustering-derived prototypes. The first, Maximum Prototype Likelihood Classifier, defines a prototype as the distribution of a labelled cluster. The…

Subjects/Keywords: weather radar; Bayesian classification; polarimetric variables; hydrometeor classification

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APA (6^th Edition):

WEN, G. (2014). A study on hydrometeor classification with polarimetric variables. (Doctoral Dissertation). University of Melbourne. Retrieved from http://hdl.handle.net/11343/42123

Chicago Manual of Style (16^th Edition):

WEN, GUANG. “A study on hydrometeor classification with polarimetric variables.” 2014. Doctoral Dissertation, University of Melbourne. Accessed January 22, 2021. http://hdl.handle.net/11343/42123.

MLA Handbook (7^th Edition):

WEN, GUANG. “A study on hydrometeor classification with polarimetric variables.” 2014. Web. 22 Jan 2021.

Vancouver:

WEN G. A study on hydrometeor classification with polarimetric variables. [Internet] [Doctoral dissertation]. University of Melbourne; 2014. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/11343/42123.

Council of Science Editors:

WEN G. A study on hydrometeor classification with polarimetric variables. [Doctoral Dissertation]. University of Melbourne; 2014. Available from: http://hdl.handle.net/11343/42123

University of South Florida

17. Zhu, Ziyi. Measuring and Utilizing High-Dimensional Information of Optical Fields.

Degree: 2019, University of South Florida

URL: https://scholarcommons.usf.edu/etd/8097

► Currently, many areas of optical techniques including imaging, inspection and communication emphasize the utilization of the high-dimensional information encoded in optical fields. There is also… (more)

▼ Currently, many areas of optical techniques including imaging, inspection and communication emphasize the utilization of the high-dimensional information encoded in optical fields. There is also a requirement for novel measurement techniques to extract this high-dimensional information with high-speed and accuracy. We firstly introduce a scan-free direct measurement technique that is capable of simultaneously characterizing the amplitude and phase of a coherent scalar optical field. Our direct measurement approach is constituted of a weak polarization perturbation which is followed by the recording of a polarization-resolving imaging process. The weak perturbation rotates the linear polarization on the spatial frequency domain of the detected field without noticeably changing the properties of the optical field. Then the high-dimensional Stokes parameter profiles are recorded in a single-shot such that the amplitude and phase profiles of the optical field are presented without some of the common complications from imaging or digital processing methods. Because our approach does not require an additional reference beam, the common-path optical configuration can minimize the effects of vibration and reduce the complication of the optical system. We have also developed our technique to measure the high-dimensional information encoded in an optical vector field, which has spatially varying polarization and phase profiles. Through a sequence of separating polarization components, a weak polarization perturbation, and a polarization-resolving imaging process, the final readout is directly related to the complex amplitude profile of the two polarization components of the vector beam. We experimentally demonstrate that our direct measurement technique can characterize both scalar and optical vector fields in a single-shot proving its use as a high-speed, extremely high-resolution, unambiguous measurement technique. Currently, many areas of optical techniques including imaging, inspection and communication emphasize the utilization of the high-dimensional information encoded in optical fields. There is also a requirement for novel measurement techniques to extract this high-dimensional information with high-speed and accuracy. We firstly introduce a scan-free direct measurement technique that is capable of simultaneously characterizing the amplitude and phase of a coherent scalar optical field. Our direct measurement approach is constituted of a weak polarization perturbation which is followed by the recording of a polarization-resolving imaging process. The weak perturbation rotates the linear polarization on the spatial frequency domain of the detected field without noticeably changing the properties of the optical field. Then the high-dimensional Stokes parameter profiles are recorded in a single-shot such that the amplitude and phase profiles of the optical field are presented without some of the common complications from imaging or digital processing methods. Because our approach does not require an additional reference…

Subjects/Keywords: holography; optical communications; optical metrology; polarimetric imaging; Optics; Other Education

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APA (6^th Edition):

Zhu, Z. (2019). Measuring and Utilizing High-Dimensional Information of Optical Fields. (Thesis). University of South Florida. Retrieved from https://scholarcommons.usf.edu/etd/8097

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Zhu, Ziyi. “Measuring and Utilizing High-Dimensional Information of Optical Fields.” 2019. Thesis, University of South Florida. Accessed January 22, 2021. https://scholarcommons.usf.edu/etd/8097.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Zhu, Ziyi. “Measuring and Utilizing High-Dimensional Information of Optical Fields.” 2019. Web. 22 Jan 2021.

Vancouver:

Zhu Z. Measuring and Utilizing High-Dimensional Information of Optical Fields. [Internet] [Thesis]. University of South Florida; 2019. [cited 2021 Jan 22]. Available from: https://scholarcommons.usf.edu/etd/8097.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Zhu Z. Measuring and Utilizing High-Dimensional Information of Optical Fields. [Thesis]. University of South Florida; 2019. Available from: https://scholarcommons.usf.edu/etd/8097

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Arizona

18. Drummond, Krista. Polarimetric Road Ice Detection .

Degree: 2014, University of Arizona

URL: http://hdl.handle.net/10150/347115

► Ever since automobiles became affordable for the average American, with the introduction of the Ford Model T in 1908, making driving safer has been a… (more)

▼ Ever since automobiles became affordable for the average American, with the introduction of the Ford Model T in 1908, making driving safer has been a priority. While driver intoxication and distraction are the leading causes of automotive fatalities, poor road conditions increase the frequency and deadliness of these incidents. Monitoring road conditions for thousands of miles of road is a huge undertaking, one too large for human surveillance. Automated systems capable of detecting and reacting to dangerous road conditions would be life-saving. These systems could be mounted to the sides of road and notify an operator of conditions in real-time. Drivers could be warned, action taken, and many lives saved. This thesis investigated the science behind polarimetric road ice detection systems. Laboratory Mueller matrix measurements of a simulated road under differing surface conditions were collected searching for a discriminatory polarization property. These Mueller matrices were decomposed into depolarization, diattenuation, and retardance. Individual sample surface polarization properties were then calculated from these three unique matrices and compared. Simulated road samples were measured under many wavelengths and angles, which gave us a larger data library from which to observe trends. Specular and off-specular reflection responses of each sample were also collected. Four polarization properties stood out for having high separation between dry and iced measurements: Depolarization Index, Linear Diattenuation, Linear Polarizance, and Linear Retardance. Through our investigation polarimetric ice detection is possible. Continued research of the polarization properties of road ice can result in the development of a road ice detection system. Proposed deployment methods of such a system have been outlined following the analysis of the data collected in this experiment. Not only is polarimetric ice detection an exciting and novel use of polarization, it has the potential to improve road safety through real-time ice response measures. Advisors/Committee Members: Chipman, Russell A (advisor), Chipman, Russell A. (committeemember), Milster, Thomas (committeemember), Schwiegerling, James (committeemember).

Subjects/Keywords: Ice; Mueller; Polarimetric; Polarimetry; Polarization; Optical Sciences; Depolarization

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APA (6^th Edition):

Drummond, K. (2014). Polarimetric Road Ice Detection . (Masters Thesis). University of Arizona. Retrieved from http://hdl.handle.net/10150/347115

Chicago Manual of Style (16^th Edition):

Drummond, Krista. “Polarimetric Road Ice Detection .” 2014. Masters Thesis, University of Arizona. Accessed January 22, 2021. http://hdl.handle.net/10150/347115.

MLA Handbook (7^th Edition):

Drummond, Krista. “Polarimetric Road Ice Detection .” 2014. Web. 22 Jan 2021.

Vancouver:

Drummond K. Polarimetric Road Ice Detection . [Internet] [Masters thesis]. University of Arizona; 2014. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/10150/347115.

Council of Science Editors:

Drummond K. Polarimetric Road Ice Detection . [Masters Thesis]. University of Arizona; 2014. Available from: http://hdl.handle.net/10150/347115

University of Oklahoma

19. Dunn, Zachary. Digital Predistortion of Pseudo-Orthogonal Wideband Waveforms for Dual-Polarimetric Phased Array Radars.

Degree: PhD, 2016, University of Oklahoma

URL: http://hdl.handle.net/11244/34587

► Many new and interesting radar operational modes and techniques are being explored to maximize the efficiency and utility of next-generation radar systems while complying with… (more)

▼ Many new and interesting radar operational modes and techniques are being explored to maximize the efficiency and utility of next-generation radar systems while complying with increasingly stringent operational and budgeting requirements. This dissertation's aim is to analyze and present possible techniques to help maximize the scientific value of measurements while complying with operational requirements through methods of physical transmission and exciting the target area, methods of processing the received waveforms, and methods of designing waveforms for a given system. In regard to methods of physical transmission and exciting the target area, this dissertation addresses unique problems that will be faced by next-generation radar systems utilizing simultaneous transmit and simultaneous receive operational modes in polarimetric active phased array architectures. This is accomplished through establishing mathematical representations of the received complex baseband waveforms for dual-polarimetric radar operation and analyzing the predicted behavior versus traditional polarimetric radar alternating transmit and simultaneous receive operation. In regard to methods of processing the received waveforms, pulse compression will undoubtedly be widely utilized in future radar systems due to the increase in range resolution that it provides for a given pulse length. Additionally, matched filtering allows the realization of simultaneously transmitted pseudo-orthogonal waveforms occupying the same spectral region that would be otherwise impossible. As a result, the mathematical basis of pulse compression is provided, and pulse compression effects are taken into account in all relevant system analyses in this manuscript. This dissertation arguably provides the most attention in regard to methods for designing and modifying waveforms for application in a given system. An analysis of common pulse compression waveforms for suitability in pseudo-orthogonal waveform sets is provided in addition to a novel method for designing polyphase coded waveform and non-linear frequency modulated waveform based pseudo-orthogonal waveform sets utilizing particle swarm optimization. Additionally, for the first time, research is presented on the full design and application methods for digital predistortion of wideband solid state radar amplifiers. Digital predistortion methods and results are presented for both the impedance matched high power amplifier case and for the varying load impedance case that can be expected to be encountered in radar systems utilizing electronic beamsteering in active phased array architectures. Overall, this dissertation's aim is to provide relevant results from conducted research in the form of analysis and novel design methods that can be applied in both the design and operation of next-generation radar systems to maximize utility and scientific data quality while operating within given system and environmental specifications. Advisors/Committee Members: Yeary, Mark (advisor), Fulton, Caleb (committee member), Goodman, Nathan (committee member), Ruyle, Jessica (committee member), Biggerstaff, Michael (committee member).

Subjects/Keywords: Digital Predistortion; Phased Array; Polarimetric; Engineering, Electronics and Electrical.

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Dunn, Z. (2016). Digital Predistortion of Pseudo-Orthogonal Wideband Waveforms for Dual-Polarimetric Phased Array Radars. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/34587

Chicago Manual of Style (16^th Edition):

Dunn, Zachary. “Digital Predistortion of Pseudo-Orthogonal Wideband Waveforms for Dual-Polarimetric Phased Array Radars.” 2016. Doctoral Dissertation, University of Oklahoma. Accessed January 22, 2021. http://hdl.handle.net/11244/34587.

MLA Handbook (7^th Edition):

Dunn, Zachary. “Digital Predistortion of Pseudo-Orthogonal Wideband Waveforms for Dual-Polarimetric Phased Array Radars.” 2016. Web. 22 Jan 2021.

Vancouver:

Dunn Z. Digital Predistortion of Pseudo-Orthogonal Wideband Waveforms for Dual-Polarimetric Phased Array Radars. [Internet] [Doctoral dissertation]. University of Oklahoma; 2016. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/11244/34587.

Council of Science Editors:

Dunn Z. Digital Predistortion of Pseudo-Orthogonal Wideband Waveforms for Dual-Polarimetric Phased Array Radars. [Doctoral Dissertation]. University of Oklahoma; 2016. Available from: http://hdl.handle.net/11244/34587

University of Oklahoma

20. Griffin, Erica. A Polarimetric and Microphysical Investigation of Winter Storms.

Degree: PhD, 2018, University of Oklahoma

URL: http://hdl.handle.net/11244/316762

► The U.S. WSR-88D network has been upgraded to polarimetric capabilities, providing dual-polarization data for regions of the country never before sampled by polarimetric radar and… (more)

▼ The U.S. WSR-88D network has been upgraded to polarimetric capabilities, providing dual-polarization data for regions of the country never before sampled by polarimetric radar and allowing for an unprecedented view into the ice microphysical processes within winter precipitation. As the polarimetric data became available, a database was compiled, consisting of thousands of hours of polarimetric observations in a wide variety of winter precipitation events and exhibiting several intriguing and repetitive polarimetric signatures. Understanding what these polarimetric signatures reveal about different microphysical processes is crucial for improving their representation in numerical weather prediction models and quantitative precipitation estimation algorithms, as well as for better understanding precipitation formation and evolution throughout the depth of a cloud, ultimately improving winter weather forecasting. This study first investigates the evolution and nature of intriguing and previously undocumented polarimetric signatures observed during the historic 8-9 February 2013 Northeast blizzard, and examines them in light of the thermodynamic environment within which they developed and the apparent microphysical processes that were active when they appeared. A more climatological and quantitative analysis is then conducted using a new quasi-vertical profile (QVP) methodology to investigate the microphysical evolution and significance of polarimetric signatures and their statistical correlations in the dendritic growth layer (DGL), at the tops of clouds, and near and within the melting layer (ML) in a selection of winter events. A statistical polarimetric model of the ML is introduced and a new method to estimate KDP in the ML is used to present the first reliable QVP statistics of KDP in the ML at S band. Advisors/Committee Members: Schuur, Terry (advisor), Chilson, Phillip (advisor), Biggerstaff, Michael (committee member), Zhang, Guifu (committee member), Engel, Michael (committee member).

Subjects/Keywords: Polarimetric radar; Ice microphysics; Winter storms; Quasi-Vertical Profiles

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Griffin, E. (2018). A Polarimetric and Microphysical Investigation of Winter Storms. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/316762

Chicago Manual of Style (16^th Edition):

Griffin, Erica. “A Polarimetric and Microphysical Investigation of Winter Storms.” 2018. Doctoral Dissertation, University of Oklahoma. Accessed January 22, 2021. http://hdl.handle.net/11244/316762.

MLA Handbook (7^th Edition):

Griffin, Erica. “A Polarimetric and Microphysical Investigation of Winter Storms.” 2018. Web. 22 Jan 2021.

Vancouver:

Griffin E. A Polarimetric and Microphysical Investigation of Winter Storms. [Internet] [Doctoral dissertation]. University of Oklahoma; 2018. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/11244/316762.

Council of Science Editors:

Griffin E. A Polarimetric and Microphysical Investigation of Winter Storms. [Doctoral Dissertation]. University of Oklahoma; 2018. Available from: http://hdl.handle.net/11244/316762

University of Oklahoma

21. Li, Zhe. CYLINDRICAL POLARIMETRIC PHASED ARRAY RADAR DEMONSTRATOR: PERFORMANCE ASSESSMENT AND WEATHER MEASUREMENTS.

Degree: PhD, 2020, University of Oklahoma

URL: http://hdl.handle.net/11244/325311

► A desirable candidate for future weather observation is a polarimetric phased array radar (PPAR), which is capable of both using polarimetry for multi-parameter measurements and… (more)

▼ A desirable candidate for future weather observation is a polarimetric phased array radar (PPAR), which is capable of both using polarimetry for multi-parameter measurements and the fast-scan proficiency of the PAR. However, it is challenging to collect high-quality polarimetric radar data of weather with a planar PPAR (PPPAR), whose beam and polarization characteristics change with the electronic beam direction, causing geometrically induced cross-polarization coupling, sensitivity losses, and measurement biases when the PPPAR beam is steered away from the broadside. As an alternative to PPPAR, the concept of cylindrical polarimetric phased array radar (CPPAR) was proposed, which has scan-invariant beam characteristics in azimuth and polarization purity in all directions using commutating scan, thus enables high quality polarimetric weather measurements. To validate the CPPAR concept, a small-scale CPPAR demonstrator has been jointly developed by the Advanced Radar Research Center (ARRC) at the University of Oklahoma (OU) and the National Severe Storms Laboratory (NSSL) of NOAA. This dissertation presents the results of initial weather measurements, shows the performance of the CPPAR demonstrator, and evaluates the polarimetric data quality that has been achieved. The system specifications and field tests of the CPPAR demonstrator are provided, including system overview, waveform design and verification, pattern optimization and far-field tests. In addition, three methods of system calibration are introduced and compared, including calibration with an external source, calibration with weather measurements of mechanical scan, and calibration with ground clutter. It is found that calibration with weather measurements of mechanical scan has the best performance and it is applied on the CPPAR demonstrator for the first time, which effectively improved the beam-to-beam consistency and radar data quality in commutating beam electronic scan by minimizing gain and beamwidth variations. Performance of the CPPAR is assessed through system simulation and weather measurements. The CPPAR is evaluated through an end-to-end phased array radar system simulator (PASIM). The simulation framework, weather returns modeling, antenna pattern, channel electronics, and simulation results of CPPAR, as well as comparison with those that would be obtained with a PPPAR, are provided. Also, weather measurements of a few convective precipitation cases and a stratiform precipitation case made with the CPPAR, employing the single beam mechanical scan and commutating beam electronic scan respectively, are presented. First, a qualitative comparison is made between the CPPAR and a nearby operational NEXRAD. Then a quantitative comparison is conducted between the mechanical scan and electronic scan, and error statistics are estimated and discussed. In addition, a theoretical explanation of a feature of the commutating beam electronic scan in clutter detection that is different from mechanical scan is presented and verified by measurements in clear… Advisors/Committee Members: Zhang, Guifu (advisor), Sigmarsson, Hjalti (committee member), Zrnić, Dusan (committee member), Zhu, Meijun (committee member), Zhang, Yan (committee member).

Subjects/Keywords: Engineering, Electronics and Electrical.; Weather Radar; Cylindrical Polarimetric Phased Array Radar

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Li, Z. (2020). CYLINDRICAL POLARIMETRIC PHASED ARRAY RADAR DEMONSTRATOR: PERFORMANCE ASSESSMENT AND WEATHER MEASUREMENTS. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/325311

Chicago Manual of Style (16^th Edition):

Li, Zhe. “CYLINDRICAL POLARIMETRIC PHASED ARRAY RADAR DEMONSTRATOR: PERFORMANCE ASSESSMENT AND WEATHER MEASUREMENTS.” 2020. Doctoral Dissertation, University of Oklahoma. Accessed January 22, 2021. http://hdl.handle.net/11244/325311.

MLA Handbook (7^th Edition):

Li, Zhe. “CYLINDRICAL POLARIMETRIC PHASED ARRAY RADAR DEMONSTRATOR: PERFORMANCE ASSESSMENT AND WEATHER MEASUREMENTS.” 2020. Web. 22 Jan 2021.

Vancouver:

Li Z. CYLINDRICAL POLARIMETRIC PHASED ARRAY RADAR DEMONSTRATOR: PERFORMANCE ASSESSMENT AND WEATHER MEASUREMENTS. [Internet] [Doctoral dissertation]. University of Oklahoma; 2020. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/11244/325311.

Council of Science Editors:

Li Z. CYLINDRICAL POLARIMETRIC PHASED ARRAY RADAR DEMONSTRATOR: PERFORMANCE ASSESSMENT AND WEATHER MEASUREMENTS. [Doctoral Dissertation]. University of Oklahoma; 2020. Available from: http://hdl.handle.net/11244/325311

22. Jagannathan, Preshanth. Full Mueller imaging: direction dependent corrections in polarimetric radio imaging.

Degree: Image, Astronomy, 2018, University of Cape Town

URL: http://hdl.handle.net/11427/28421

► Magnetic fields pervade the universe, spanning a multitude of scales from the dipolar field on Earth, to the largest gravitationally bound structures such as galaxy… (more)

Subjects/Keywords: Polarimetric Radio Imaging; astronomy

…implementation refer Sec. 3.3.3.) Large area spectro-polarimetric surveys have produced grids of… …of radio polarimetric surveys are a part of a new era of wideband, wide-area, full Stokes… …rotation measure 1.2 Overview of the thesis 11 high fidelity polarimetric imaging forms the…

10 more images…

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APA (6^th Edition):

Jagannathan, P. (2018). Full Mueller imaging: direction dependent corrections in polarimetric radio imaging. (Thesis). University of Cape Town. Retrieved from http://hdl.handle.net/11427/28421

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Jagannathan, Preshanth. “Full Mueller imaging: direction dependent corrections in polarimetric radio imaging.” 2018. Thesis, University of Cape Town. Accessed January 22, 2021. http://hdl.handle.net/11427/28421.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Jagannathan, Preshanth. “Full Mueller imaging: direction dependent corrections in polarimetric radio imaging.” 2018. Web. 22 Jan 2021.

Vancouver:

Jagannathan P. Full Mueller imaging: direction dependent corrections in polarimetric radio imaging. [Internet] [Thesis]. University of Cape Town; 2018. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/11427/28421.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Jagannathan P. Full Mueller imaging: direction dependent corrections in polarimetric radio imaging. [Thesis]. University of Cape Town; 2018. Available from: http://hdl.handle.net/11427/28421

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Dayton

23. Sargent, Garrett Craig. A Conditional Generative Adversarial Network Demosaicing Strategy for Division of Focal Plane Polarimeters.

Degree: PhD, Electrical and Computer Engineering, 2020, University of Dayton

URL: http://rave.ohiolink.edu/etdc/view?acc_num=dayton1606050550958383

► Division of focal plane (DoFP), or integrated microgrid polarimeters, typically consist of a 2x2 mosaic of linear polarization filters overlaid upon a focal plane array… (more)

Subjects/Keywords: Electrical Engineering; deep learning; GAN; demosaicing; polarimetric imaging; microgrid polarimeters

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APA (6^th Edition):

Sargent, G. C. (2020). A Conditional Generative Adversarial Network Demosaicing Strategy for Division of Focal Plane Polarimeters. (Doctoral Dissertation). University of Dayton. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=dayton1606050550958383

Chicago Manual of Style (16^th Edition):

Sargent, Garrett Craig. “A Conditional Generative Adversarial Network Demosaicing Strategy for Division of Focal Plane Polarimeters.” 2020. Doctoral Dissertation, University of Dayton. Accessed January 22, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1606050550958383.

MLA Handbook (7^th Edition):

Sargent, Garrett Craig. “A Conditional Generative Adversarial Network Demosaicing Strategy for Division of Focal Plane Polarimeters.” 2020. Web. 22 Jan 2021.

Vancouver:

Sargent GC. A Conditional Generative Adversarial Network Demosaicing Strategy for Division of Focal Plane Polarimeters. [Internet] [Doctoral dissertation]. University of Dayton; 2020. [cited 2021 Jan 22]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=dayton1606050550958383.

Council of Science Editors:

Sargent GC. A Conditional Generative Adversarial Network Demosaicing Strategy for Division of Focal Plane Polarimeters. [Doctoral Dissertation]. University of Dayton; 2020. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=dayton1606050550958383

24. Cesar Edwin Garcia Cortes. Análise de imagem polarimétrica TerraSAR-X para classificação de uso e cobertura da terra na porção sudoeste da Amazônia Brasileira.

Degree: 2011, Instituto Nacional de Pesquisas Espaciais

URL: http://urlib.net/sid.inpe.br/mtc-m19/2011/02.16.20.25

►

The objective of this study is to analyze the potential use of images from satellite TerraSAR-X, at StripMap acquisition mode, to map and identify the… (more)

▼

The objective of this study is to analyze the potential use of images from satellite TerraSAR-X, at StripMap acquisition mode, to map and identify the land use and land cover (LULC) in the southwestern Brazilian Amazon. Classifiers based on statistical functions for maximum likelihood (ML) method and based on frequency-based contextual and neural network classification technique (Context) was used in images of amplitude in dual polarization (HH and VV), a synthesized image derivative of the covariance matrix <HH.VV*>and entropy (Entropy (H)), derived from the decomposition of targets by Cloude and Pottier. The results of these classifications were evaluated by the confusion matrix and itΚ index. Physiognomic-structural and field observation points (GPS) served as reference for classification of six land cover classes and to evaluate the performance of the approaches used. It can be stated that all components [A_<HH>, A_<VV>, A_<HH.VV*> e A_Entropy], at Context Classification performed better with an overall accuracy of 78,33% and itΚ 0,70. This allows us to conclude on the important role of TerraSAR-X images for the characterization of thematic landscape in the southwestern Brazilian Amazon, including new tools for monitoring human activities and its environmental impact, adding information to already existing traditional optical products obtained in areas of high cloud cover, as it occurs in tropical rain forests.

O presente trabalho tem como objetivo analisar o uso potencial de imagens SAR polarimétricas do sensor TerraSAR-X, no modo it{StripMap}, para mapear o uso e cobertura da terra na região sudoeste da Amazônia brasileira. No procedimento metodológico foram empregados dois classificadores, um baseado nas funções estatísticas de máxima verossimilhança (MAXVER) e o método contextual (it{Context}), utilizando imagens de amplitude nas polarizações individuais (A_<HH> e A_<VV>) e da derivada da matriz de covariância A_<HH.VV*>, bem como da entropia (A_{Entropia (H)}), derivada da decomposição de alvos por auto-valores. Os resultados temáticos dessas classificações foram avaliados através da matriz de confusão e pelo índice itΚ. Levantamentos fisionômico-estruturais em campo e pontos de observação devidamente georreferenciados serviram de referência para classificação de 6 classes de uso e cobertura da terra e para avaliação do desempenho das abordagens utilizadas. De forma sintetizada pode-se afirmar que o conjunto de componentes [A_<HH>, A_<VV>, A_<HH.VV*> e A_Entropia], por meio da classificação it{Context}, apresentou melhor desempenho classificatório, com exatidão global de 78.33% e índice itΚ 0.70. Isso nos permite concluir sobre o importante papel das imagens TerraSAR-X na caracterização temática da paisagem sudoeste da Amazônia, contribuindo também no processo de monitoramento das atividades decorrentes da ação humana, adicionando informações aos já tradicionalmente existentes produtos ópticos…

Advisors/Committee Members: Márcio de Morisson Valeriano, João Roberto dos Santos, José Cláudio Mura, Hermann Johann Heinrich Kux, Marisa Dantas Bitencourt Pereira.

Subjects/Keywords: mapeamento florestal; radar; classificação polarimétrica; Amazônia; forest mapping; radar; polarimetric classification; Amazon (region)

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APA (6^th Edition):

Cortes, C. E. G. (2011). Análise de imagem polarimétrica TerraSAR-X para classificação de uso e cobertura da terra na porção sudoeste da Amazônia Brasileira. (Thesis). Instituto Nacional de Pesquisas Espaciais. Retrieved from http://urlib.net/sid.inpe.br/mtc-m19/2011/02.16.20.25

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Cortes, Cesar Edwin Garcia. “Análise de imagem polarimétrica TerraSAR-X para classificação de uso e cobertura da terra na porção sudoeste da Amazônia Brasileira.” 2011. Thesis, Instituto Nacional de Pesquisas Espaciais. Accessed January 22, 2021. http://urlib.net/sid.inpe.br/mtc-m19/2011/02.16.20.25.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Cortes, Cesar Edwin Garcia. “Análise de imagem polarimétrica TerraSAR-X para classificação de uso e cobertura da terra na porção sudoeste da Amazônia Brasileira.” 2011. Web. 22 Jan 2021.

Vancouver:

Cortes CEG. Análise de imagem polarimétrica TerraSAR-X para classificação de uso e cobertura da terra na porção sudoeste da Amazônia Brasileira. [Internet] [Thesis]. Instituto Nacional de Pesquisas Espaciais; 2011. [cited 2021 Jan 22]. Available from: http://urlib.net/sid.inpe.br/mtc-m19/2011/02.16.20.25.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Cortes CEG. Análise de imagem polarimétrica TerraSAR-X para classificação de uso e cobertura da terra na porção sudoeste da Amazônia Brasileira. [Thesis]. Instituto Nacional de Pesquisas Espaciais; 2011. Available from: http://urlib.net/sid.inpe.br/mtc-m19/2011/02.16.20.25

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Michigan

25. Oh, Yisok. Microwave polarimetric backscattering from natural rough surfaces.

Degree: PhD, Geophysics, 1993, University of Michigan

URL: http://hdl.handle.net/2027.42/129296

► In this thesis the radar backscatter response of natural rough surfaces is studied for the purpose of retrieving the soil moisture and surface roughness parameters… (more)

▼ In this thesis the radar backscatter response of natural rough surfaces is studied for the purpose of retrieving the soil moisture and surface roughness parameters from microwave radar observations. This investigation, which included theoretical, numerical and experimental components, has lead to the development of a hybrid scattering model for predicting the polarimetric radar response of bare soil surfaces. This model is then used as a basis to develop an inversion algorithm for the soil moisture and surface roughness parameters based on the measured polarimetric radar backscatter when the radar parameters are known. Classical scattering models, such as the small perturbation method and the Kirchhoff approximation (the physical optics and the geometrical optics models), are re-examined and an improved Kirchhoff approximate solution is derived. The analytical solutions based on the classical scattering models are examined by comparing them to the results obtained from exact numerical simulations and extensive experimental observations. A Monte Carlo method is used in conjunction with the method of moments to provide a scattering solution for one-dimensional conducting surfaces. Also, the effect of dielectric inhomogeneity in a soil medium is studied by developing an efficient numerical technique for one-dimensional inhomogeneous dielectric rough surfaces. Unfortunately, the numerical simulation for a one-dimensional surface does not produce depolarization and its prediction for co-polarized components are much different from real surfaces that are two-dimensional. Therefore, careful controlled experiments are conducted to study surfaces with two-dimensional roughness. An accurate technique for measuring the polarimetric backscatter from distributed targets was also developed. Using this method, an extensive experimental data set are acquired from bare soil surfaces with many different roughness and moisture conditions at microwave frequencies. The scattering behavior based on these experimental observations and the results derived from the theoretical and the numerical studies have been combined to develop the hybrid (semi-empirical) scattering model for the backscattering coefficients, σ_sp{vv}{{o}}, σ_sp{hh}{{o}}, σ_sp{hv}{{o}}. This model and its inversion algorithm are tested against many independent data sets, and excellent agreement is obtained. Advisors/Committee Members: Sarabandi, Kamal (advisor), Ulaby, Fawwaz T. (advisor).

Subjects/Keywords: Backscattering; Microwave; Natural; Polarimetric; Rough; Surfaces

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Oh, Y. (1993). Microwave polarimetric backscattering from natural rough surfaces. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/129296

Chicago Manual of Style (16^th Edition):

Oh, Yisok. “Microwave polarimetric backscattering from natural rough surfaces.” 1993. Doctoral Dissertation, University of Michigan. Accessed January 22, 2021. http://hdl.handle.net/2027.42/129296.

MLA Handbook (7^th Edition):

Oh, Yisok. “Microwave polarimetric backscattering from natural rough surfaces.” 1993. Web. 22 Jan 2021.

Vancouver:

Oh Y. Microwave polarimetric backscattering from natural rough surfaces. [Internet] [Doctoral dissertation]. University of Michigan; 1993. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/2027.42/129296.

Council of Science Editors:

Oh Y. Microwave polarimetric backscattering from natural rough surfaces. [Doctoral Dissertation]. University of Michigan; 1993. Available from: http://hdl.handle.net/2027.42/129296

26. Miller, Thomas Jerome. Polarimetric Radar Scattering Analysis in a Maritime Environment.

Degree: PhD, Electrical Engineering and Computer Science, 2015, Catholic U of America

URL: http://hdl.handle.net/1961/cuislandora:28280

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This dissertation evaluates multiple effects that will cause a satellite borne radar to observe transformation of the transmitted polarization by an ocean surface. Knowing the… (more)

Subjects/Keywords: Electrical engineering; Remote sensing; Electromagnetics; Antennas; Ocean Remote Sensing; Polarimetric; Radar; Scatterometry; XPI

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Miller, T. J. (2015). Polarimetric Radar Scattering Analysis in a Maritime Environment. (Doctoral Dissertation). Catholic U of America. Retrieved from http://hdl.handle.net/1961/cuislandora:28280

Chicago Manual of Style (16^th Edition):

Miller, Thomas Jerome. “Polarimetric Radar Scattering Analysis in a Maritime Environment.” 2015. Doctoral Dissertation, Catholic U of America. Accessed January 22, 2021. http://hdl.handle.net/1961/cuislandora:28280.

MLA Handbook (7^th Edition):

Miller, Thomas Jerome. “Polarimetric Radar Scattering Analysis in a Maritime Environment.” 2015. Web. 22 Jan 2021.

Vancouver:

Miller TJ. Polarimetric Radar Scattering Analysis in a Maritime Environment. [Internet] [Doctoral dissertation]. Catholic U of America; 2015. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/1961/cuislandora:28280.

Council of Science Editors:

Miller TJ. Polarimetric Radar Scattering Analysis in a Maritime Environment. [Doctoral Dissertation]. Catholic U of America; 2015. Available from: http://hdl.handle.net/1961/cuislandora:28280

Colorado State University

27. Chen, Haonan. Quantitative precipitation estimation for an X-band weather radar network.

Degree: MS(M.S.), Electrical and Computer Engineering, 2013, Colorado State University

URL: http://hdl.handle.net/10217/79026

► Currently, the Next Generation (NEXRAD) radar network, a joint effort of the U.S. Department of Commerce (DOC), Defense (DOD), and Transportation (DOT), provides radar data… (more)

▼ Currently, the Next Generation (NEXRAD) radar network, a joint effort of the U.S. Department of Commerce (DOC), Defense (DOD), and Transportation (DOT), provides radar data with updates every five-six minutes across the United States. This network consists of about 160 S-band (2.7 to 3.0 GHz) radar sites. At the maximum NEXRAD range of 230 km, the 0.5 degree radar beam is about 5.4 km above ground level (AGL) because of the effect of earth curvature. Consequently, much of the lower atmosphere (1-3 km AGL) cannot be observed by the NEXRAD. To overcome the fundamental coverage limitations of today's weather surveillance radars, and improve the spatial and temporal resolution issues, the National Science Foundation Engineering Center (NSF-ERC) for Collaborative Adaptive Sensing of the Atmosphere (CASA) was founded to revolutionize weather sensing in the lower atmosphere by deploying a dense network of shorter-range, low-power X-band dual-polarization radars. The distributed CASA radars are operating collaboratively to adapt the changing atmospheric conditions. Accomplishments and breakthroughs after five years operation have demonstrated the success of CASA program. Accurate radar quantitative precipitation estimation (QPE) has been pursued since the beginning of weather radar. For certain disaster prevention applications such as flash flood and landslide forecasting, the rain rate must however be measured at a high spatial and temporal resolution. To this end, high-resolution radar QPE is one of the major research activities conducted by the CASA community. A radar specific differential propagation phase (Kdp)-based QPE methodology has been developed in CASA. Unlike the rainfall estimation based on the power terms such as radar reflectivity (Z) and differential reflectivity (Zdr), Kdp-based QPE is less sensitive to the path attenuation, drop size distribution (DSD), and radar calibration errors. The CASA Kdp-based QPE system is also immune to the partial beam blockage and hail contamination. The performance of the CASA QPE system is validated and evaluated by using rain gauges. In CASA's Integrated Project 1 (IP1) test bed in Southwestern Oklahoma, a network of 20 rainfall gauges is used for cross-comparison. 40 rainfall cases, including severe, multicellular thunderstorms, squall lines and widespread stratiform rain, that happened during years 2007 - 2011, are used for validation and evaluation purpose. The performance scores illustrate that the CASA QPE system is a great improvement compared to the current state-of-the-art. In addition, the high-resolution CASA QPE products such as instantaneous rainfall rate map and hourly rainfall amount measurements can serve as a reliable input for various distributed hydrological models. The CASA QPE system can save lived and properties from hazardous flash floods by incorporating hydraulic and hydrologic models for flood monitoring and warning. Advisors/Committee Members: Chandrasekar, V. (advisor), Notaros, Branislav M. (committee member), Mielke, Paul W. (committee member).

Subjects/Keywords: polarimetric radar; specific differential phase (KDP) estimation; radar network; quantitative precipitation estimation

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APA (6^th Edition):

Chen, H. (2013). Quantitative precipitation estimation for an X-band weather radar network. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/79026

Chicago Manual of Style (16^th Edition):

Chen, Haonan. “Quantitative precipitation estimation for an X-band weather radar network.” 2013. Masters Thesis, Colorado State University. Accessed January 22, 2021. http://hdl.handle.net/10217/79026.

MLA Handbook (7^th Edition):

Chen, Haonan. “Quantitative precipitation estimation for an X-band weather radar network.” 2013. Web. 22 Jan 2021.

Vancouver:

Chen H. Quantitative precipitation estimation for an X-band weather radar network. [Internet] [Masters thesis]. Colorado State University; 2013. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/10217/79026.

Council of Science Editors:

Chen H. Quantitative precipitation estimation for an X-band weather radar network. [Masters Thesis]. Colorado State University; 2013. Available from: http://hdl.handle.net/10217/79026

28. Anna, Guillaume. Optimisation du contraste dans les images polarimétriques : étude théorique, algorithmes et validation expérimentale : Contrast optimisation in polarimetric images : theoretical study, algorithms and experimental validation.

Degree: Docteur es, Physique, 2013, Université Paris-Sud – Paris XI

URL: http://www.theses.fr/2013PA112143

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L'imagerie polarimétrique consiste à acquérir des images contenant des informations relatives à la polarisation de la lumière diffusée par une scène. L'objectif de cette thèse… (more)

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L'imagerie polarimétrique consiste à acquérir des images contenant des informations relatives à la polarisation de la lumière diffusée par une scène. L'objectif de cette thèse est d'utiliser les propriétés de ce type d'imagerie afin de d'améliorer le contraste entre plusieurs objets d'intérêt.Dans le cadre de l'optimisation du contraste entre deux objets d'intérêt, nous démontrons que, si l'on travaille à temps d'acquisition fixe, c'est l'acquisition d'une unique image avec des états d'illumination et d'analyse optimisés qui permet d'atteindre les meilleures performances. C'est pourquoi nous avons développé un imageur pouvant générer et analyser n'importe quel état de polarisation sur la sphère de Poincaré, en utilisant des cellules à cristaux liquides. Ces états peuvent être contrôlés afin de faire varier le contraste dans les images et nous montrons que les ``états optimaux" permettant de maximiser le contraste dépendent des conditions de mesure. En particulier, la valeur des états de polarisation maximisant le contraste entre deux objets d'intérêt dépend des bruits de mesure (bruit de détecteur, bruit de Poisson, Speckle) ainsi que des fluctuations spatiales des propriétés polarimétriques dans la scène. Une mauvaise estimation de la source de bruit peut donc amener à une perte significative de contraste.Nous nous intéressons ensuite à un scénario d'imagerie plus complexe où la scène peut être illuminée de manière non-uniforme. Nous proposons une méthode d'acquisition utilisant l'ensemble des degrés de liberté fournis par notre imageur et montrons que cette méthode permet d'augmenter significativement le contraste par rapport aux résultats obtenus avec d'autres types d'imagerie comme l'imagerie OSC (Orthogonal State Contrast).Nous étendons ensuite nos études à un cas ``multicibles" où plus de deux objets doivent être distingués. Nous montrons notamment que l'accroissement du nombre d'images peut dégrader le contraste et qu'il existe un nombre optimal d'images à acquérir si l'on travaille à temps d'acquisition fixe.Enfin, nous proposons une méthode visant à automatiser notre imageur pour l'optimisation du contraste en combinant de manière itérative l'acquisition d'images polarimétriques optimisées et un algorithme de segmentation par contours actifs statistiques. Des premiers résultats expérimentaux mettent en évidence l'avantage de cette intégration d'algorithmes de traitement numérique au c\oe ur du processus d'acquisition de l'image.

The polarimetric imaging consists in acquiring images containing information relating to the polarization of the scattered light from a scene. The objective of this thesis is to use the properties of this type of imaging to enhance the contrast between several objects of interest.Considering the optimization of the contrast between two objects of interest, we demonstrate that, if the time for the measurement is fixed, it is the acquisition of a single image with optimized states in illumination and analysis that achieves the best performance. That is why we have developed an…

Advisors/Committee Members: Goudail, François (thesis director).

Subjects/Keywords: Polarisation; Imagerie; Bruit; Traitement du signal; Polarimetric imaging; Signal processing; Contrast enhancement

10 more images…

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APA (6^th Edition):

Anna, G. (2013). Optimisation du contraste dans les images polarimétriques : étude théorique, algorithmes et validation expérimentale : Contrast optimisation in polarimetric images : theoretical study, algorithms and experimental validation. (Doctoral Dissertation). Université Paris-Sud – Paris XI. Retrieved from http://www.theses.fr/2013PA112143

Chicago Manual of Style (16^th Edition):

Anna, Guillaume. “Optimisation du contraste dans les images polarimétriques : étude théorique, algorithmes et validation expérimentale : Contrast optimisation in polarimetric images : theoretical study, algorithms and experimental validation.” 2013. Doctoral Dissertation, Université Paris-Sud – Paris XI. Accessed January 22, 2021. http://www.theses.fr/2013PA112143.

MLA Handbook (7^th Edition):

Anna, Guillaume. “Optimisation du contraste dans les images polarimétriques : étude théorique, algorithmes et validation expérimentale : Contrast optimisation in polarimetric images : theoretical study, algorithms and experimental validation.” 2013. Web. 22 Jan 2021.

Vancouver:

Anna G. Optimisation du contraste dans les images polarimétriques : étude théorique, algorithmes et validation expérimentale : Contrast optimisation in polarimetric images : theoretical study, algorithms and experimental validation. [Internet] [Doctoral dissertation]. Université Paris-Sud – Paris XI; 2013. [cited 2021 Jan 22]. Available from: http://www.theses.fr/2013PA112143.

Council of Science Editors:

Anna G. Optimisation du contraste dans les images polarimétriques : étude théorique, algorithmes et validation expérimentale : Contrast optimisation in polarimetric images : theoretical study, algorithms and experimental validation. [Doctoral Dissertation]. Université Paris-Sud – Paris XI; 2013. Available from: http://www.theses.fr/2013PA112143

George Mason University

29. Foster, Kyle A. Measurements of the Opposition Effect in the Visible and Near-Infrared Using an Improvised Imaging Spectropolarimeter .

Degree: 2013, George Mason University

URL: http://hdl.handle.net/1920/8001

► Spectropolarimetry is a remote sensing technique that combines both spectral and polarimetric measurements. It is already well-established in the astronomical community as an indispensable tool,… (more)

▼ Spectropolarimetry is a remote sensing technique that combines both spectral and polarimetric measurements. It is already well-established in the astronomical community as an indispensable tool, permitting characterization of dust clouds and stars, and enhancing observations of planetary bodies. One such noteworthy phenomenon is the opposition effect, wherein a planetary body such as the Moon exhibits a surge in reflected intensity as the phase angle—an angle between the Sun, the Moon, and the observer—decreases to below approximately five degrees. Astronomical and laboratory investigations into the opposition effect reveal that the light of this surge often has a polarized component. The terrestrial remote sensing community is starting to develop an interest in spectropolarimetry. Spectral and polarimetric measurements alone, while useful in their diverse applications, stand to benefit from the added dimensionality that spectropolarimetric measurements provide. Examples of applications that benefit from spectropolarimetric measurement include environmental monitoring, search & rescue, and countering denial and deception techniques. To that end, an improvised imaging spectropolarimeter sensitive in the visible and near-infrared spectrum has been developed by attaching a linear polarization filter to a SOC700 hyperspectral imaging system for use in further development of spectropolarimetric applications. The results of three research objectives are reported upon. First, validation of the operation of the improvised imaging spectropolarimeter and the resulting data calibration and processing techniques, including generating Stokes parameter imagery, is successfully completed. Second, demonstrating that the improvised system is capable of observing the opposition effect in a laboratory setting is also confirmed. Third, the improvised system is used to characterize various materials—including rare earth element oxides and ultra-high performance concrete—in various phase angle geometries, with the intent of determining whether the polarized component of the opposition effect yields sufficient additional information for material detection and identification. Advisors/Committee Members: Cervone, Guido (advisor).

Subjects/Keywords: spectropolarimetry; polarimetric imaging; hyperspectral imaging; Stokes imagery; opposition effect; visible and near-infrared

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APA (6^th Edition):

Foster, K. A. (2013). Measurements of the Opposition Effect in the Visible and Near-Infrared Using an Improvised Imaging Spectropolarimeter . (Thesis). George Mason University. Retrieved from http://hdl.handle.net/1920/8001

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Foster, Kyle A. “Measurements of the Opposition Effect in the Visible and Near-Infrared Using an Improvised Imaging Spectropolarimeter .” 2013. Thesis, George Mason University. Accessed January 22, 2021. http://hdl.handle.net/1920/8001.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Foster, Kyle A. “Measurements of the Opposition Effect in the Visible and Near-Infrared Using an Improvised Imaging Spectropolarimeter .” 2013. Web. 22 Jan 2021.

Vancouver:

Foster KA. Measurements of the Opposition Effect in the Visible and Near-Infrared Using an Improvised Imaging Spectropolarimeter . [Internet] [Thesis]. George Mason University; 2013. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/1920/8001.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Foster KA. Measurements of the Opposition Effect in the Visible and Near-Infrared Using an Improvised Imaging Spectropolarimeter . [Thesis]. George Mason University; 2013. Available from: http://hdl.handle.net/1920/8001

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Iowa

30. Domaszczynski, Piotr. Performance evaluation of a network of polarimetric X-Band radars used for rainfall estimation.

Degree: PhD, Civil and Environmental Engineering, 2012, University of Iowa

URL: https://ir.uiowa.edu/etd/3286

► Networks of small, often mobile, polarimetric radars are gaining popularity in the hydrometeorology community due to their rainfall observing capabilities and relative low purchase… (more)

▼ Networks of small, often mobile, polarimetric radars are gaining popularity in the hydrometeorology community due to their rainfall observing capabilities and relative low purchase cost. In recent years, a number of installations have become operational around the globe. The problem of signal attenuation by intervening rainfall has been recognized as the major source of error in rainfall estimation by short-wavelength (C-, X, K-band) radars. The simultaneous observation of precipitation by multiple radars creates new prospects for better and more robust attenuation correction algorithms and, consequently, yields more accurate rainfall estimation. The University of Iowa hydrometeorology group's acquisition of a network of four mobile, polarimetric, X-band radars has resulted in the need for a thoughtful evaluation of the instrument. In this work, we use computer simulations and the data collected by The University of Iowa Polarimetric Radar Network to study the performance of attenuation correction methods in single-radar and network-based arrangements. To support the computer simulations, we developed a comprehensive polarimetric radar network simulator, which replicates the essential aspects of the radar network rainfall observing process. The simulations are based on a series of physics- and stochastic-based simulated rainfall events occurring over the area of interest. The characteristics of the simulated radars are those of The University of Iowa Polarimetric Radar Network. We assess the correction methods by analyzing the errors in reflectivity and rainfall rate over the area of interest covered by the network's radars. To enable the implementation of the attenuation correction methods to the data collected by The University of Iowa Polarimetric Radar Network, we first developed a set of utilities to assist with efficient data collection and analysis. Next, we conducted a series of calibration tests to evaluate the relative calibration and channel balance of the 2 network's radars. Finally, in an attempt to verify the results obtained via computer simulations, we applied the set of attenuation correction algorithms to the data collected by The University of Iowa Polarimetric Radar Network. Advisors/Committee Members: Krajewski, Witold F. (supervisor).

Subjects/Keywords: attenuation correction; Polarimetric radar networks; radar network simulator; X-band radar; Civil and Environmental Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Domaszczynski, P. (2012). Performance evaluation of a network of polarimetric X-Band radars used for rainfall estimation. (Doctoral Dissertation). University of Iowa. Retrieved from https://ir.uiowa.edu/etd/3286

Chicago Manual of Style (16^th Edition):

Domaszczynski, Piotr. “Performance evaluation of a network of polarimetric X-Band radars used for rainfall estimation.” 2012. Doctoral Dissertation, University of Iowa. Accessed January 22, 2021. https://ir.uiowa.edu/etd/3286.

MLA Handbook (7^th Edition):

Domaszczynski, Piotr. “Performance evaluation of a network of polarimetric X-Band radars used for rainfall estimation.” 2012. Web. 22 Jan 2021.

Vancouver:

Domaszczynski P. Performance evaluation of a network of polarimetric X-Band radars used for rainfall estimation. [Internet] [Doctoral dissertation]. University of Iowa; 2012. [cited 2021 Jan 22]. Available from: https://ir.uiowa.edu/etd/3286.

Council of Science Editors:

Domaszczynski P. Performance evaluation of a network of polarimetric X-Band radars used for rainfall estimation. [Doctoral Dissertation]. University of Iowa; 2012. Available from: https://ir.uiowa.edu/etd/3286

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Open Access Theses and Dissertations