subject:(Weather Radar)

Colorado State University

1. Le, Minda. Microphysical retrieval and profile classification for GPM dual-frequency precipitation radar and ground validation.

Degree: PhD, Electrical and Computer Engineering, 2013, Colorado State University

URL: http://hdl.handle.net/10217/78832

► The Global Precipitation Measurement (GPM) mission, planned as the next satellite mission following the Tropical Rainfall Measurement Mission (TRMM), is jointly sponsored by the National… (more)

▼ The Global Precipitation Measurement (GPM) mission, planned as the next satellite mission following the Tropical Rainfall Measurement Mission (TRMM), is jointly sponsored by the National Aeronautic and Space Administration (NASA) of USA and the Japanese Aerospace Exploration Agency (JAXA) with additional partners, the Centre National d'Études Spatiales (CNES), the Indian Space Research Organization (ISRO), the National Oceanic and Atmospheric Administration (NOAA), the European Organization for the Exploitation of Meteorological Satellites (EUMETSAT), and others. The core satellite of GPM mission will be equipped with a dual-frequency precipitation radar (DPR) operating at Ku- (13.6 GHz) and Ka- (35.5 GHz) band with the capability to cover ±65° latitude of the earth. One primary goal of the DPR is to improve accuracy in estimation of drop size distribution (DSD) parameters of precipitation particles. The estimation of the DSD parameters helps achieve more accurate estimation of precipitation rates. The DSD is also centrally important in the determination of the electromagnetic scattering properties of precipitation media. The combination of data from the two frequency channels, in principle, can provide more accurate estimates of DSD parameters than the TRMM Precipitation radar (TRMM PR) with Ku- band channel only. In this research, a methodology is developed to retrieve DSD parameters for GPM-DPR. Profile classification is a critical module in the microphysical retrieval system for GPM-DPR. The nature of microphysical models and equations for use in the DSD retrieval algorithm are determined by the precipitation type of each profile and the phase state of the hydrometeors. In the GPM era, the Ka- band channel enables the detection of light rain or snowfall in the mid- and high- latitudes compared to the TRMM PR (Ku- band only). GPM-DPR offers dual-frequency observations (measured reflectivity at Ku- band:Ζm (Ku) and measured reflectivity at Ka- band:Ζm (Ku)) along each vertical profile, which provide additional information for investigating the microphysical properties using the difference in measured radar reflectivities at the two frequencies, a quantity often called the measured dual-frequency ratio (DFRm) can be defined (DFRm=Ζm (Ku) — Ζm (Ka)). Both non-Rayleigh scattering effects and attenuation difference control the shape of the DFRm profile. Its pattern is determined by the forward and backscattering properties of the mixed phase and rain media and the backscattering properties of ice. Therefore, DFRm could provide better performance in precipitation type classification and hydrometeor profile characterization than TRMM PR. In this research, two methods, precipitation type classification (PCM) and hydrometeor profile characterization (HPC), are developed to perform profile classification for GPM-DPR using the DFRm profile and its range variability. The methods have been implemented into the GPM-DPR day one algorithm. Ground validation is an integral part of all satellite precipitation missions. Similar to… Advisors/Committee Members: Chandrasekar, V. Chandra (advisor), Jayasumana, Anura P. (committee member), Mielke, Paul W. (committee member), Notaros, Branislav (committee member).

Subjects/Keywords: microphysics; weather radar

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Le, M. (2013). Microphysical retrieval and profile classification for GPM dual-frequency precipitation radar and ground validation. (Doctoral Dissertation). Colorado State University. Retrieved from http://hdl.handle.net/10217/78832

Chicago Manual of Style (16^th Edition):

Le, Minda. “Microphysical retrieval and profile classification for GPM dual-frequency precipitation radar and ground validation.” 2013. Doctoral Dissertation, Colorado State University. Accessed February 27, 2021. http://hdl.handle.net/10217/78832.

MLA Handbook (7^th Edition):

Le, Minda. “Microphysical retrieval and profile classification for GPM dual-frequency precipitation radar and ground validation.” 2013. Web. 27 Feb 2021.

Vancouver:

Le M. Microphysical retrieval and profile classification for GPM dual-frequency precipitation radar and ground validation. [Internet] [Doctoral dissertation]. Colorado State University; 2013. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10217/78832.

Council of Science Editors:

Le M. Microphysical retrieval and profile classification for GPM dual-frequency precipitation radar and ground validation. [Doctoral Dissertation]. Colorado State University; 2013. Available from: http://hdl.handle.net/10217/78832

Texas A&M University

2. Mosier, Richard Matthew. Radar-Derived Forecasts of Cloud-to-Ground Lightning Over Houston, Texas.

Degree: MS, Atmospheric Sciences, 2011, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7263

► Ten years (1997 - 2006) of summer (June, July, August) daytime (14 - 00 Z) Weather Surveillance Radar - 1988 Doppler data for Houston, TX… (more)

Subjects/Keywords: Radar: Reflectivity; Lightning; Weather; Forecasting

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Mosier, R. M. (2011). Radar-Derived Forecasts of Cloud-to-Ground Lightning Over Houston, Texas. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7263

Chicago Manual of Style (16^th Edition):

Mosier, Richard Matthew. “Radar-Derived Forecasts of Cloud-to-Ground Lightning Over Houston, Texas.” 2011. Masters Thesis, Texas A&M University. Accessed February 27, 2021. http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7263.

MLA Handbook (7^th Edition):

Mosier, Richard Matthew. “Radar-Derived Forecasts of Cloud-to-Ground Lightning Over Houston, Texas.” 2011. Web. 27 Feb 2021.

Vancouver:

Mosier RM. Radar-Derived Forecasts of Cloud-to-Ground Lightning Over Houston, Texas. [Internet] [Masters thesis]. Texas A&M University; 2011. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7263.

Council of Science Editors:

Mosier RM. Radar-Derived Forecasts of Cloud-to-Ground Lightning Over Houston, Texas. [Masters Thesis]. Texas A&M University; 2011. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7263

Delft University of Technology

3. Figueras i Ventura, J. Design of a High Resolution X-band Doppler Polarimetric Weather Radar.

Degree: 2009, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:d90b9ad6-237b-435d-9dc5-5660d9e7fbdd ; urn:NBN:nl:ui:24-uuid:d90b9ad6-237b-435d-9dc5-5660d9e7fbdd ; urn:NBN:nl:ui:24-uuid:d90b9ad6-237b-435d-9dc5-5660d9e7fbdd ; http://resolver.tudelft.nl/uuid:d90b9ad6-237b-435d-9dc5-5660d9e7fbdd

► The impact of the increase in anthropogenic aerosols on the global climate and the precipitation cycle is not yet fully understood. One of the reasons… (more)

Subjects/Keywords: weather radar

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Figueras i Ventura, J. (2009). Design of a High Resolution X-band Doppler Polarimetric Weather Radar. (Doctoral Dissertation). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:d90b9ad6-237b-435d-9dc5-5660d9e7fbdd ; urn:NBN:nl:ui:24-uuid:d90b9ad6-237b-435d-9dc5-5660d9e7fbdd ; urn:NBN:nl:ui:24-uuid:d90b9ad6-237b-435d-9dc5-5660d9e7fbdd ; http://resolver.tudelft.nl/uuid:d90b9ad6-237b-435d-9dc5-5660d9e7fbdd

Chicago Manual of Style (16^th Edition):

Figueras i Ventura, J. “Design of a High Resolution X-band Doppler Polarimetric Weather Radar.” 2009. Doctoral Dissertation, Delft University of Technology. Accessed February 27, 2021. http://resolver.tudelft.nl/uuid:d90b9ad6-237b-435d-9dc5-5660d9e7fbdd ; urn:NBN:nl:ui:24-uuid:d90b9ad6-237b-435d-9dc5-5660d9e7fbdd ; urn:NBN:nl:ui:24-uuid:d90b9ad6-237b-435d-9dc5-5660d9e7fbdd ; http://resolver.tudelft.nl/uuid:d90b9ad6-237b-435d-9dc5-5660d9e7fbdd.

MLA Handbook (7^th Edition):

Figueras i Ventura, J. “Design of a High Resolution X-band Doppler Polarimetric Weather Radar.” 2009. Web. 27 Feb 2021.

Vancouver:

Figueras i Ventura J. Design of a High Resolution X-band Doppler Polarimetric Weather Radar. [Internet] [Doctoral dissertation]. Delft University of Technology; 2009. [cited 2021 Feb 27]. Available from: http://resolver.tudelft.nl/uuid:d90b9ad6-237b-435d-9dc5-5660d9e7fbdd ; urn:NBN:nl:ui:24-uuid:d90b9ad6-237b-435d-9dc5-5660d9e7fbdd ; urn:NBN:nl:ui:24-uuid:d90b9ad6-237b-435d-9dc5-5660d9e7fbdd ; http://resolver.tudelft.nl/uuid:d90b9ad6-237b-435d-9dc5-5660d9e7fbdd.

Council of Science Editors:

Figueras i Ventura J. Design of a High Resolution X-band Doppler Polarimetric Weather Radar. [Doctoral Dissertation]. Delft University of Technology; 2009. Available from: http://resolver.tudelft.nl/uuid:d90b9ad6-237b-435d-9dc5-5660d9e7fbdd ; urn:NBN:nl:ui:24-uuid:d90b9ad6-237b-435d-9dc5-5660d9e7fbdd ; urn:NBN:nl:ui:24-uuid:d90b9ad6-237b-435d-9dc5-5660d9e7fbdd ; http://resolver.tudelft.nl/uuid:d90b9ad6-237b-435d-9dc5-5660d9e7fbdd

University of Oklahoma

4. Byrd, Andrew. Multistatic Passive Weather Radar.

Degree: PhD, 2020, University of Oklahoma

URL: http://hdl.handle.net/11244/323907

► Practical and accurate estimation of three-dimensional wind fields is an ongoing challenge in radar meteorology. Multistatic (single transmitter / multiple receivers) radar architectures offer a… (more)

Subjects/Keywords: Radar; Weather; Multistatic; Pattern Synthesis

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Byrd, A. (2020). Multistatic Passive Weather Radar. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/323907

Chicago Manual of Style (16^th Edition):

Byrd, Andrew. “Multistatic Passive Weather Radar.” 2020. Doctoral Dissertation, University of Oklahoma. Accessed February 27, 2021. http://hdl.handle.net/11244/323907.

MLA Handbook (7^th Edition):

Byrd, Andrew. “Multistatic Passive Weather Radar.” 2020. Web. 27 Feb 2021.

Vancouver:

Byrd A. Multistatic Passive Weather Radar. [Internet] [Doctoral dissertation]. University of Oklahoma; 2020. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/11244/323907.

Council of Science Editors:

Byrd A. Multistatic Passive Weather Radar. [Doctoral Dissertation]. University of Oklahoma; 2020. Available from: http://hdl.handle.net/11244/323907

Delft University of Technology

5. Akerboom, M.H.G. (author). Tornado Detection using a Dual Polarimetric X-band Doppler Weather Radar in The Netherlands: A Case Study.

Degree: 2016, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:566b629b-fb13-4240-98db-865599af3b3f

►

Hazardous whirlwind and tornado events are uncommon in the Netherlands. Though, the phenomenon is more frequently spotted over the last years, where significant damage is… (more)

Subjects/Keywords: X-band radar; Weather radar; Tornado detection

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Akerboom, M. H. G. (. (2016). Tornado Detection using a Dual Polarimetric X-band Doppler Weather Radar in The Netherlands: A Case Study. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:566b629b-fb13-4240-98db-865599af3b3f

Chicago Manual of Style (16^th Edition):

Akerboom, M H G (author). “Tornado Detection using a Dual Polarimetric X-band Doppler Weather Radar in The Netherlands: A Case Study.” 2016. Masters Thesis, Delft University of Technology. Accessed February 27, 2021. http://resolver.tudelft.nl/uuid:566b629b-fb13-4240-98db-865599af3b3f.

MLA Handbook (7^th Edition):

Akerboom, M H G (author). “Tornado Detection using a Dual Polarimetric X-band Doppler Weather Radar in The Netherlands: A Case Study.” 2016. Web. 27 Feb 2021.

Vancouver:

Akerboom MHG(. Tornado Detection using a Dual Polarimetric X-band Doppler Weather Radar in The Netherlands: A Case Study. [Internet] [Masters thesis]. Delft University of Technology; 2016. [cited 2021 Feb 27]. Available from: http://resolver.tudelft.nl/uuid:566b629b-fb13-4240-98db-865599af3b3f.

Council of Science Editors:

Akerboom MHG(. Tornado Detection using a Dual Polarimetric X-band Doppler Weather Radar in The Netherlands: A Case Study. [Masters Thesis]. Delft University of Technology; 2016. Available from: http://resolver.tudelft.nl/uuid:566b629b-fb13-4240-98db-865599af3b3f

Colorado State University

6. Nguyen, Cuong Manh. Electronic scan weather radar: scan strategy and signal processing for volume targets.

Degree: PhD, Electrical and Computer Engineering, 2013, Colorado State University

URL: http://hdl.handle.net/10217/80963

► Following the success of the WSR-88D network, considerable effort has been directed toward searching for options for the next generation of weather radar technology. With… (more)

▼ Following the success of the WSR-88D network, considerable effort has been directed toward searching for options for the next generation of weather radar technology. With its superior capability for rapidly scanning the atmosphere, electronically scanned phased array radar (PAR) is a potential candidate. A network of such radars has been recommended for consideration by the National Academies Committee on Weather Radar Technology beyond NEXRAD. While conventional weather radar uses a rotating parabolic antenna to form and direct the beam, a phased array radar superimposes outputs from an array of many similar radiating elements to yield a beam that is scanned electronically. An adaptive scan strategy and advanced signal designs and processing concepts are developed in this work to use PAR effectively for weather observation. An adaptive scan strategy for weather targets is developed based on the space-time variability of the storm under observation. Quickly evolving regions are scanned more often and spatial sampling resolution is matched to spatial scale. A model that includes the interaction between space and time is used to extract spatial and temporal scales of the medium and to define scanning regions. The temporal scale constrains the radar revisit time while the measurement accuracy controls the dwell time. These conditions are employed in a task scheduler that works on a ray-by-ray basis and is designed to balance task priority and radar resources. The scheduler algorithm also includes an optimization procedure for minimizing radar scan time. In this research, a signal model for polarimetric phased array weather radar (PAWR) is presented and analyzed. The electronic scan mechanism creates a complex coupling of horizontal and vertical polarizations that produce the bias in the polarimetric variables retrieval. Methods for bias correction for simultaneous and alternating transmission modes are proposed. It is shown that the bias can be effectively removed; however, data quality degradation occurs at far off boresight directions. The effective range for the bias correction methods is suggested by using radar simulation. The pulsing scheme used in PAWR requires a new ground clutter filtering method. The filter is designed to work with a signal covariance matrix in the time domain. The matrix size is set to match the data block size. The filter's design helps overcome limitations of spectral filtering methods and make efficient use of reducing ground clutter width in PAWR. Therefore, it works on modes with few samples. Additionally, the filter can be directly extended for staggered PRT waveforms. Filter implementation for polarimetric retrieval is also successfully developed and tested for simultaneous and alternating staggered PRT. The performance of these methods is discussed in detail. It is important to achieve high sensitivity for PAWR. The use of low-power solid state transmitters to keep costs down requires pulse compression technique. Wide-band pulse compression filters will partly reduce the system… Advisors/Committee Members: Chandra, Chandrasekar V. (advisor), Jayasumana, Anura P. (committee member), Mielke, Paul W. (committee member), Notaros, Branislav (committee member).

Subjects/Keywords: polarimetric weather radar; remote sensing; radar signal processing; electronic scan strategy; phased array weather radar; radar pulse compression

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Nguyen, C. M. (2013). Electronic scan weather radar: scan strategy and signal processing for volume targets. (Doctoral Dissertation). Colorado State University. Retrieved from http://hdl.handle.net/10217/80963

Chicago Manual of Style (16^th Edition):

Nguyen, Cuong Manh. “Electronic scan weather radar: scan strategy and signal processing for volume targets.” 2013. Doctoral Dissertation, Colorado State University. Accessed February 27, 2021. http://hdl.handle.net/10217/80963.

MLA Handbook (7^th Edition):

Nguyen, Cuong Manh. “Electronic scan weather radar: scan strategy and signal processing for volume targets.” 2013. Web. 27 Feb 2021.

Vancouver:

Nguyen CM. Electronic scan weather radar: scan strategy and signal processing for volume targets. [Internet] [Doctoral dissertation]. Colorado State University; 2013. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10217/80963.

Council of Science Editors:

Nguyen CM. Electronic scan weather radar: scan strategy and signal processing for volume targets. [Doctoral Dissertation]. Colorado State University; 2013. Available from: http://hdl.handle.net/10217/80963

7. Nichols, Ryan T. Winter Weather Observation with the Ma1 Radar.

Degree: MSin Electrical and Computer Engineering (M.S.E.C.E.), Electrical & Computer Engineering, 2009, U of Massachusetts : Masters

URL: http://scholarworks.umass.edu/theses/231

Subjects/Keywords: radar; casa; weather

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Nichols, R. T. (2009). Winter Weather Observation with the Ma1 Radar. (Masters Thesis). U of Massachusetts : Masters. Retrieved from http://scholarworks.umass.edu/theses/231

Chicago Manual of Style (16^th Edition):

Nichols, Ryan T. “Winter Weather Observation with the Ma1 Radar.” 2009. Masters Thesis, U of Massachusetts : Masters. Accessed February 27, 2021. http://scholarworks.umass.edu/theses/231.

MLA Handbook (7^th Edition):

Nichols, Ryan T. “Winter Weather Observation with the Ma1 Radar.” 2009. Web. 27 Feb 2021.

Vancouver:

Nichols RT. Winter Weather Observation with the Ma1 Radar. [Internet] [Masters thesis]. U of Massachusetts : Masters; 2009. [cited 2021 Feb 27]. Available from: http://scholarworks.umass.edu/theses/231.

Council of Science Editors:

Nichols RT. Winter Weather Observation with the Ma1 Radar. [Masters Thesis]. U of Massachusetts : Masters; 2009. Available from: http://scholarworks.umass.edu/theses/231

University of Oklahoma

8. Ge, Guoqing. ON THE FURTHER STUDIES OF SUITABLE STORM-SCALE 3DVAR DATA ASSIMILATION FOR THE PREDICTION OF TORNADIC THUNDERSTORMS.

Degree: PhD, 2011, University of Oklahoma

URL: http://hdl.handle.net/11244/319176

► To help boost dynamic consistency among model variables, the storm-scale diagnostic pressure equation is incorporated into the storm-scale 3DVAR cost function in the form of… (more)

Subjects/Keywords: Thunderstorm forecasting; Weather forecasting; Tornadoes; Doppler radar

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Ge, G. (2011). ON THE FURTHER STUDIES OF SUITABLE STORM-SCALE 3DVAR DATA ASSIMILATION FOR THE PREDICTION OF TORNADIC THUNDERSTORMS. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/319176

Chicago Manual of Style (16^th Edition):

Ge, Guoqing. “ON THE FURTHER STUDIES OF SUITABLE STORM-SCALE 3DVAR DATA ASSIMILATION FOR THE PREDICTION OF TORNADIC THUNDERSTORMS.” 2011. Doctoral Dissertation, University of Oklahoma. Accessed February 27, 2021. http://hdl.handle.net/11244/319176.

MLA Handbook (7^th Edition):

Ge, Guoqing. “ON THE FURTHER STUDIES OF SUITABLE STORM-SCALE 3DVAR DATA ASSIMILATION FOR THE PREDICTION OF TORNADIC THUNDERSTORMS.” 2011. Web. 27 Feb 2021.

Vancouver:

Ge G. ON THE FURTHER STUDIES OF SUITABLE STORM-SCALE 3DVAR DATA ASSIMILATION FOR THE PREDICTION OF TORNADIC THUNDERSTORMS. [Internet] [Doctoral dissertation]. University of Oklahoma; 2011. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/11244/319176.

Council of Science Editors:

Ge G. ON THE FURTHER STUDIES OF SUITABLE STORM-SCALE 3DVAR DATA ASSIMILATION FOR THE PREDICTION OF TORNADIC THUNDERSTORMS. [Doctoral Dissertation]. University of Oklahoma; 2011. Available from: http://hdl.handle.net/11244/319176

University of Oklahoma

9. Griffin, Casey. Polarimetric and Rapid-Scan Radar Observations of Tornadoes.

Degree: PhD, 2019, University of Oklahoma

URL: http://hdl.handle.net/11244/320424

► Tornadoes are capable of lofting large pieces of debris that present irregular shapes, near-random orientations, and a wide range of dielectric constants to polarimetric radars.… (more)

▼ Tornadoes are capable of lofting large pieces of debris that present irregular shapes, near-random orientations, and a wide range of dielectric constants to polarimetric radars. While ties between tornadic debris signature (TDS) characteristics and tornado- and storm-scale kinematic processes have been speculated upon or investigated using photogrammetry and single-Doppler analyses, little work has been done to relate the three-dimensional wind eld to TDS characteristics and behavior. Additionally a knowledge gap in larger-scale transport and sedimentation of debris exists within the literature. This study utilizes data collected by the University of Oklahoma's Advanced Radar Research Center's OU-PRIME C-band radar as well as KTLX and KOUN WSR-88D S-band radars to study three tornadoes that occurred in Central Oklahoma on 10 May 2010. The relationship between polarimetric and kinematic variables are interrogated revealing an instance where large tornado subvortices were associated with comparatively high reflectivity, low correlation coefficient, and were surrounded by negative differential reflectivity. Comparisons of the polarimetric characteristics of two tornadoes interacting with similar land cover but with different intensities are documented. Also, the storm-scale sedimentation of debris within the supercell is investigated revealing a novel observation of TDS rotation and elongation with height. Additionally, a novel dual-wavelength comparison of debris within the tornado to debris in the near-tornado environment is presented revealing larger dual-wavelength differences in polarimetric variables for debris within the tornado and increasingly similar inner and out debris characteristics as height increases. While new insight into the behavior of tornadic debris is elucidated in this study, tornadoes themselves evolve on much shorter timescales than what can be resolved by traditional, mechanically steered radars. In order to illustrate the benefit of rapid-scan radars for the study of tornado evolution and to motivate future rapid-scan polarimetric radar observations of tornadoes and debris, high-temporal resolution observations of the 27 May 2015 Canadian, Texas, tornado collected by the Atmospheric Imaging Radar (AIR) are presented. A 10-s resolution time-height investigation of vortex tilt and differential velocity ( V) is presented and illustrates an instance of upward vortex intensification as well as downward tornado decay. Changes in tornado intensity over periods of less than 30 s coincided with rapid changes in tornado diameter. At least two small-scale vortices were observed being shed from the tornado during a brief weakening period. A persistent layer of vortex tilt was observed near the level of free convection, which separated two layers with contrasting modes of tornado decay. Finally, the vertical cross-correlation of vortex intensity reveals that apart from the brief instances of upward vortex intensification and downward decay, tornado intensity was highly correlated throughout the… Advisors/Committee Members: Palmer, Robert (advisor), Bodine, David (advisor), Fulton, Caleb (committee member), Zhang, Guifu (committee member), Chilson, Phillip (committee member).

Subjects/Keywords: Weather Radar; Tornado; Debris; Supercell Thunderstorm

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Griffin, C. (2019). Polarimetric and Rapid-Scan Radar Observations of Tornadoes. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/320424

Chicago Manual of Style (16^th Edition):

Griffin, Casey. “Polarimetric and Rapid-Scan Radar Observations of Tornadoes.” 2019. Doctoral Dissertation, University of Oklahoma. Accessed February 27, 2021. http://hdl.handle.net/11244/320424.

MLA Handbook (7^th Edition):

Griffin, Casey. “Polarimetric and Rapid-Scan Radar Observations of Tornadoes.” 2019. Web. 27 Feb 2021.

Vancouver:

Griffin C. Polarimetric and Rapid-Scan Radar Observations of Tornadoes. [Internet] [Doctoral dissertation]. University of Oklahoma; 2019. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/11244/320424.

Council of Science Editors:

Griffin C. Polarimetric and Rapid-Scan Radar Observations of Tornadoes. [Doctoral Dissertation]. University of Oklahoma; 2019. Available from: http://hdl.handle.net/11244/320424

Penn State University

10. Manion, Robert Charles. Transition of Convection from the Mountains to the Plains along the Colorado Front Range as Detected by TDWR .

Degree: 2011, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/11918

► The relationship between primary convection over the mountains and secondary convection over the plains is examined along the Front Range of northeastern Colorado. Data collected… (more)

Subjects/Keywords: weather; meteorology; tdwr; terminal doppler weather radar; radar; mountain meteorology; colorado; thunderstorms; denver

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Manion, R. C. (2011). Transition of Convection from the Mountains to the Plains along the Colorado Front Range as Detected by TDWR . (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/11918

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):

Manion, Robert Charles. “Transition of Convection from the Mountains to the Plains along the Colorado Front Range as Detected by TDWR .” 2011. Thesis, Penn State University. Accessed February 27, 2021. https://submit-etda.libraries.psu.edu/catalog/11918.

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

MLA Handbook (7^th Edition):

Manion, Robert Charles. “Transition of Convection from the Mountains to the Plains along the Colorado Front Range as Detected by TDWR .” 2011. Web. 27 Feb 2021.

Vancouver:

Manion RC. Transition of Convection from the Mountains to the Plains along the Colorado Front Range as Detected by TDWR . [Internet] [Thesis]. Penn State University; 2011. [cited 2021 Feb 27]. Available from: https://submit-etda.libraries.psu.edu/catalog/11918.

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

Council of Science Editors:

Manion RC. Transition of Convection from the Mountains to the Plains along the Colorado Front Range as Detected by TDWR . [Thesis]. Penn State University; 2011. Available from: https://submit-etda.libraries.psu.edu/catalog/11918

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

Université Catholique de Louvain

11. Quibus, Laurent. Modelling propagation impairments of Earth-Space links using Numerical Weather Prediction tools.

Degree: 2020, Université Catholique de Louvain

URL: http://hdl.handle.net/2078.1/232080

► Communication channels between the Earth and satellites are in the on-going process to be scaled up to higher and higher carrier frequencies above 20 GHz.… (more)

▼ Communication channels between the Earth and satellites are in the on-going process to be scaled up to higher and higher carrier frequencies above 20 GHz. The change is driven forward as an increasing number of services fill up the spectral bands allocated at lower frequencies, and as using higher frequencies also results in larger bandwidths, antenna gains and directivity. However, challenges to high frequency transmissions are posed by the stronger impairments of the signal as it propagates through the troposphere. In particular, the power of the signal is attenuated due to the presence of oxygen, water vapour, clouds, rain, and turbulence. The attenuation affects the signal-to-noise ratio (SNR) by up to tens of dB so that Fade Mitigation Techniques (FMTs) become needed. Ideally, the design of FMTs should be based on direct measurements of the attenuation. Earth-space propagation experimental campaigns offer this reference thanks to spaceborne beacons emitting continuously at selected frequencies. These experiments are however costly, limited to a few receiving stations in a certain region, and lasting typically only a few years. The stations also require additional equipments such as radiometers in order to obtain the total attenuation and not just the contribution from rain events and amplitude scintillation. There is therefore an interest for models capable to derive the attenuation components from alternative measurements, so as to supplement the beacon data or fill the gaps in their coverage. Numerical Weather Predictions (NWPs) are important candidates as they aim to re-create, or even forecast, the state of the atmosphere (pressure, temperature, water, ...) starting with the assimilation of various measurements collected globally. This thesis principal objective is hence the investigation of the performances of a NWP-based simulator of the attenuation within the context of propagation experiments. The thesis opens by introducing further the problems in Earth-space propagation, FMTs, propagation impairments, propagation experiments, and NWPs. A short review of the propagation experiments shows their current limits in frequency (1 to 3, ~ 20 GHz and < 50 GHz), coverage (mostly temperate), duration (usually ~ 1 − 5 years), number of stations (from 1 to rarely ~ 20), and orbits (overwhelmingly geosynchronous orbits (GSO)). A short review of the previous usage of NWPs demonstrates the rarity of results simulated over the long-term (> 1 year), with high resolutions (< 5km horizontally, < 1 h), or for non-GSO links. It also points out the existence of two methods for the rain attenuation (rain volumetric content or rain rate), and of two methods for the cloud attenuation (NWP parametrisation or Salonen/Mattioli). The thesis continues on the description of the propagation models, NWP models, interpolations or conversion of coordinates, and error metrics involved in the simulation of the attenuation from NWP data and its comparison with other reference datasets (beacon, radiometer, and weather radar). The theoretical… Advisors/Committee Members: UCL - SST/ICTM - Institute of Information and Communication Technologies, Electronics and Applied Mathematics, UCL - Ecole Polytechnique de Louvain, Vanhoenacker-Janvier, Danielle, Craeye, Christophe, Oestges, Claude, Delobbe, Laurent, Hamdi, Rafiq, Féral, Laurent.

Subjects/Keywords: Tropospheric attenuation; Weather radar; Numerical Weather Prediction; Weather Research and Forecasting; Radiowave propagation; Microwave radiometer

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Quibus, L. (2020). Modelling propagation impairments of Earth-Space links using Numerical Weather Prediction tools. (Thesis). Université Catholique de Louvain. Retrieved from http://hdl.handle.net/2078.1/232080

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):

Quibus, Laurent. “Modelling propagation impairments of Earth-Space links using Numerical Weather Prediction tools.” 2020. Thesis, Université Catholique de Louvain. Accessed February 27, 2021. http://hdl.handle.net/2078.1/232080.

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

MLA Handbook (7^th Edition):

Quibus, Laurent. “Modelling propagation impairments of Earth-Space links using Numerical Weather Prediction tools.” 2020. Web. 27 Feb 2021.

Vancouver:

Quibus L. Modelling propagation impairments of Earth-Space links using Numerical Weather Prediction tools. [Internet] [Thesis]. Université Catholique de Louvain; 2020. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/2078.1/232080.

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

Council of Science Editors:

Quibus L. Modelling propagation impairments of Earth-Space links using Numerical Weather Prediction tools. [Thesis]. Université Catholique de Louvain; 2020. Available from: http://hdl.handle.net/2078.1/232080

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

University of Oklahoma

12. Nai, Feng. On the Potential of Adaptive Beamforming for Phased-Array Weather Radar.

Degree: PhD, 2017, University of Oklahoma

URL: http://hdl.handle.net/11244/48164

► As the Weather Surveillance Radar 1988 Doppler network reaches the end of its expected life, a network of multifunction phased-array radars (MPAR) supporting both aircraft… (more)

▼ As the Weather Surveillance Radar 1988 Doppler network reaches the end of its expected life, a network of multifunction phased-array radars (MPAR) supporting both aircraft and weather surveillance missions has been proposed. A phased-array system should match the sensitivity, spatial resolution, and data quality of the WSR-88D while having a update time of 60 seconds for weather surveillance. Since an MPAR system must complete both weather and aircraft surveillance missions, the update time reduction provided by having multiple faces is insufficient to achieve the desired 60 second update time for weather surveillance. Therefore, it is likely that multiple simultaneous beams would be needed per face to meet the timeline requirements. An approach to achieve multiple receive beams is to use a spoiled transmit beam and to form a cluster of simultaneous receive beams. However, a significant challenge for this approach is the potential of high sidelobe levels in the two-way radiation pattern, which can result in significantly biased estimates of the radar variables in situations where the signal power has large spatial variation. This dissertation proposes an adaptive beamspace algorithm designed for phased-array weather radar that utilizes a spoiled transmit beam and a cluster of simultaneous receive beams to achieve the desired timeline. Taking advantage of the adaptive algorithm's ability to automatically adjust sidelobe levels to match the scene, the high-sidelobe problem associated with a spoiled transmit beam is mitigated. Through extensive simulations, it is shown that adaptive beamspace processing can produce accurate and calibrated estimates of weather radar variables. Furthermore, it is demonstrated that the adaptive beamspace algorithm can automatically reject interference signals and reduce their impact on the radar-variable estimates. Additionally, it is shown that, despite higher sidelobe levels, the adaptive beamspace algorithm can perform similarly to a conventional system based on a dish antenna in terms of biases when reflectivity gradients are present. Finally, the adaptive beamspace algorithm is shown to compare favorably to some alternative solutions that can also achieve the desired MPAR timeline requirement while preserving data quality. Advisors/Committee Members: Palmer, Robert (advisor), Torres, Sebastian (advisor), Goodman, Nathan (committee member), Yu, Tian-You (committee member), Wang, Xuguang (committee member).

Subjects/Keywords: Adaptive Beamforming; Phased-Array Radar; Weather Radar; Beamspace

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Nai, F. (2017). On the Potential of Adaptive Beamforming for Phased-Array Weather Radar. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/48164

Chicago Manual of Style (16^th Edition):

Nai, Feng. “On the Potential of Adaptive Beamforming for Phased-Array Weather Radar.” 2017. Doctoral Dissertation, University of Oklahoma. Accessed February 27, 2021. http://hdl.handle.net/11244/48164.

MLA Handbook (7^th Edition):

Nai, Feng. “On the Potential of Adaptive Beamforming for Phased-Array Weather Radar.” 2017. Web. 27 Feb 2021.

Vancouver:

Nai F. On the Potential of Adaptive Beamforming for Phased-Array Weather Radar. [Internet] [Doctoral dissertation]. University of Oklahoma; 2017. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/11244/48164.

Council of Science Editors:

Nai F. On the Potential of Adaptive Beamforming for Phased-Array Weather Radar. [Doctoral Dissertation]. University of Oklahoma; 2017. Available from: http://hdl.handle.net/11244/48164

University of Oklahoma

13. 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

Record Details Similar Records Cite « Share

❌

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 February 27, 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. 27 Feb 2021.

Vancouver:

Li Z. CYLINDRICAL POLARIMETRIC PHASED ARRAY RADAR DEMONSTRATOR: PERFORMANCE ASSESSMENT AND WEATHER MEASUREMENTS. [Internet] [Doctoral dissertation]. University of Oklahoma; 2020. [cited 2021 Feb 27]. 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

University of Oklahoma

14. Li, Zhengzheng. Applications of Gaussian Mixture Model to Weather Observations.

Degree: PhD, 2011, University of Oklahoma

URL: http://hdl.handle.net/11244/318575

► The estimation of weather parameters such as attenuation and rainfall rates from weather radar data has been based mainly on deterministic regression models. The applications… (more)

Subjects/Keywords: Gaussian processes; Radar meteorology; Weather forecasting; Numerical weather forecasting; Monte Carlo method

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Li, Z. (2011). Applications of Gaussian Mixture Model to Weather Observations. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/318575

Chicago Manual of Style (16^th Edition):

Li, Zhengzheng. “Applications of Gaussian Mixture Model to Weather Observations.” 2011. Doctoral Dissertation, University of Oklahoma. Accessed February 27, 2021. http://hdl.handle.net/11244/318575.

MLA Handbook (7^th Edition):

Li, Zhengzheng. “Applications of Gaussian Mixture Model to Weather Observations.” 2011. Web. 27 Feb 2021.

Vancouver:

Li Z. Applications of Gaussian Mixture Model to Weather Observations. [Internet] [Doctoral dissertation]. University of Oklahoma; 2011. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/11244/318575.

Council of Science Editors:

Li Z. Applications of Gaussian Mixture Model to Weather Observations. [Doctoral Dissertation]. University of Oklahoma; 2011. Available from: http://hdl.handle.net/11244/318575

University of Oklahoma

15. Li, Zhengzheng. Applications of Gaussian Mixture Model to Weather Observations.

Degree: PhD, 2011, University of Oklahoma

URL: http://hdl.handle.net/11244/319529

► The estimation of weather parameters such as attenuation and rainfall rates from weather radar data has been based mainly on deterministic regression models. The applications… (more)

Subjects/Keywords: Gaussian processes; Radar meteorology; Weather forecasting; Numerical weather forecasting; Monte Carlo method

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Li, Z. (2011). Applications of Gaussian Mixture Model to Weather Observations. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/319529

Chicago Manual of Style (16^th Edition):

Li, Zhengzheng. “Applications of Gaussian Mixture Model to Weather Observations.” 2011. Doctoral Dissertation, University of Oklahoma. Accessed February 27, 2021. http://hdl.handle.net/11244/319529.

MLA Handbook (7^th Edition):

Li, Zhengzheng. “Applications of Gaussian Mixture Model to Weather Observations.” 2011. Web. 27 Feb 2021.

Vancouver:

Li Z. Applications of Gaussian Mixture Model to Weather Observations. [Internet] [Doctoral dissertation]. University of Oklahoma; 2011. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/11244/319529.

Council of Science Editors:

Li Z. Applications of Gaussian Mixture Model to Weather Observations. [Doctoral Dissertation]. University of Oklahoma; 2011. Available from: http://hdl.handle.net/11244/319529

University of Oklahoma

16. Ivic, Igor Rade. DETECTION THRESHOLDS FOR SPECTRAL MOMENTS AND POLARIMETRIC VARIABLES.

Degree: PhD, 2008, University of Oklahoma

URL: http://hdl.handle.net/11244/319382

► Presently, the Signal-to-Noise-Ratio (SNR) measurement is used to determine the presence of a weather signal for Weather Surveillance Radar - 1988 Doppler (WSR-88D). Growing popularity… (more)

Subjects/Keywords: Doppler radar; Weather radar networks; Spectrum analysis; Weather forecasting

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Ivic, I. R. (2008). DETECTION THRESHOLDS FOR SPECTRAL MOMENTS AND POLARIMETRIC VARIABLES. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/319382

Chicago Manual of Style (16^th Edition):

Ivic, Igor Rade. “DETECTION THRESHOLDS FOR SPECTRAL MOMENTS AND POLARIMETRIC VARIABLES.” 2008. Doctoral Dissertation, University of Oklahoma. Accessed February 27, 2021. http://hdl.handle.net/11244/319382.

MLA Handbook (7^th Edition):

Ivic, Igor Rade. “DETECTION THRESHOLDS FOR SPECTRAL MOMENTS AND POLARIMETRIC VARIABLES.” 2008. Web. 27 Feb 2021.

Vancouver:

Ivic IR. DETECTION THRESHOLDS FOR SPECTRAL MOMENTS AND POLARIMETRIC VARIABLES. [Internet] [Doctoral dissertation]. University of Oklahoma; 2008. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/11244/319382.

Council of Science Editors:

Ivic IR. DETECTION THRESHOLDS FOR SPECTRAL MOMENTS AND POLARIMETRIC VARIABLES. [Doctoral Dissertation]. University of Oklahoma; 2008. Available from: http://hdl.handle.net/11244/319382

University of Oklahoma

17. Ivic, Igor Rade. DETECTION THRESHOLDS FOR SPECTRAL MOMENTS AND POLARIMETRIC VARIABLES.

Degree: PhD, 2008, University of Oklahoma

URL: http://hdl.handle.net/11244/318431

► Presently, the Signal-to-Noise-Ratio (SNR) measurement is used to determine the presence of a weather signal for Weather Surveillance Radar - 1988 Doppler (WSR-88D). Growing popularity… (more)

Subjects/Keywords: Doppler radar; Weather radar networks; Spectrum analysis; Weather forecasting

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Ivic, I. R. (2008). DETECTION THRESHOLDS FOR SPECTRAL MOMENTS AND POLARIMETRIC VARIABLES. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/318431

Chicago Manual of Style (16^th Edition):

Ivic, Igor Rade. “DETECTION THRESHOLDS FOR SPECTRAL MOMENTS AND POLARIMETRIC VARIABLES.” 2008. Doctoral Dissertation, University of Oklahoma. Accessed February 27, 2021. http://hdl.handle.net/11244/318431.

MLA Handbook (7^th Edition):

Ivic, Igor Rade. “DETECTION THRESHOLDS FOR SPECTRAL MOMENTS AND POLARIMETRIC VARIABLES.” 2008. Web. 27 Feb 2021.

Vancouver:

Ivic IR. DETECTION THRESHOLDS FOR SPECTRAL MOMENTS AND POLARIMETRIC VARIABLES. [Internet] [Doctoral dissertation]. University of Oklahoma; 2008. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/11244/318431.

Council of Science Editors:

Ivic IR. DETECTION THRESHOLDS FOR SPECTRAL MOMENTS AND POLARIMETRIC VARIABLES. [Doctoral Dissertation]. University of Oklahoma; 2008. Available from: http://hdl.handle.net/11244/318431

18. Hopf, Anthony P. Informativeness and the Computational Metrology of Collaborative Adaptive Sensor Systems.

Degree: PhD, Electrical and Computer Engineering, 2011, U of Massachusetts : PhD

URL: https://scholarworks.umass.edu/open_access_dissertations/367

► Complex engineered systems evolve, with a tendency toward self-organization, which can, paradoxically, frustrate the aims of those seeking to develop them. The systems engineer,… (more)

▼ Complex engineered systems evolve, with a tendency toward self-organization, which can, paradoxically, frustrate the aims of those seeking to develop them. The systems engineer, seeking to promote the development in the context of changing and uncertain requirements, is challenged by conceptual gaps that emerge within engineering projects, particularly as they scale up, that inhibit communication among the various stakeholders. Overall optimization, involving multiple criterion, is often expressed in the language of the individual parties, increasing the complexity of the overall situation, subsuming the participants within the evolution of the complex engineered system, containing the objective and subjective in counterproductive or inefficient ways that can arrest healthy development. The conventional pragmatic systems engineering approach to the resolution of such situations is to introduce architectural discipline by way of separation of concerns. In complex engineered systems projects, the crucial interface, at any level of abstraction, is between the technical domain experts and higher level decision makers. Bridging the ensuing conceptual gap requires models and methods that provide communication tools promoting a convergence of the conversation between these parties on a common "common sense" of the underlying reality of the evolving engineered system. In the interest of conceptual clarity, we confine our investigation to a restricted, but important general class of evolving engineered system, information gathering and utilizing systems. Such systems naturally resolve the underlying domain specific measures by reduction into common plausible information measures aimed at an overall sense of informativeness. For concreteness, we further restrict the investigation and the demonstration to a species that is well documented in the open literature: weather radar networks, and in particular to the case of the currently emerging system referred to as CASA. The multiobjective problem of objectively exploring the high dimensionality of the decision space is done using multiobjective genetic algorithms (MOGA), specifically the John Eddy genetic algorithms (JEGA), resulting in well-formed Pareto fronts and sets containing Pareto optimal points within 20% of the ideal point. A visualization technique ensures a clear separation of the subjective criterion provided by the decision makers by superficially adding preferences to the objective optimal solutions. To identify the integrative objective functions and test patterns utilized in the MOGA analysis, explorations of networked weather radar technologies and configuration are completed. The explorations identify trends within and between network topologies, and captures both the robustness and fragility of network based measurements. The information oriented measures of fusion accuracy and precision are used to evaluate pairs of networked weather radars against a standardized low order vortex test pattern, resulting in a metrics for characterizing the… Advisors/Committee Members: Alfred P. DeFonzo, Christopher V. Hollot, Stephen Frasier.

Subjects/Keywords: decision problem; information oriented; Informativeness; radar network; sensor systems; weather radar; Electrical and Computer Engineering

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Hopf, A. P. (2011). Informativeness and the Computational Metrology of Collaborative Adaptive Sensor Systems. (Doctoral Dissertation). U of Massachusetts : PhD. Retrieved from https://scholarworks.umass.edu/open_access_dissertations/367

Chicago Manual of Style (16^th Edition):

Hopf, Anthony P. “Informativeness and the Computational Metrology of Collaborative Adaptive Sensor Systems.” 2011. Doctoral Dissertation, U of Massachusetts : PhD. Accessed February 27, 2021. https://scholarworks.umass.edu/open_access_dissertations/367.

MLA Handbook (7^th Edition):

Hopf, Anthony P. “Informativeness and the Computational Metrology of Collaborative Adaptive Sensor Systems.” 2011. Web. 27 Feb 2021.

Vancouver:

Hopf AP. Informativeness and the Computational Metrology of Collaborative Adaptive Sensor Systems. [Internet] [Doctoral dissertation]. U of Massachusetts : PhD; 2011. [cited 2021 Feb 27]. Available from: https://scholarworks.umass.edu/open_access_dissertations/367.

Council of Science Editors:

Hopf AP. Informativeness and the Computational Metrology of Collaborative Adaptive Sensor Systems. [Doctoral Dissertation]. U of Massachusetts : PhD; 2011. Available from: https://scholarworks.umass.edu/open_access_dissertations/367

19. Marco Aurelio de Barros Teixeira. Analysis of the trajectory and circulation of the precipitating systems.

Degree: 2010, Instituto Nacional de Pesquisas Espaciais

URL: http://urlib.net/sid.inpe.br/mtc-m19/2010/10.24.21.44

►

A partir da técnica "it{Least Square- Velocity Azimuth Display}" aplicada aos dados de velocidade radial, obtida a partir da varredura volumétrica de um dos radares… (more)

▼

A partir da técnica "it{Least Square- Velocity Azimuth Display}" aplicada aos dados de velocidade radial, obtida a partir da varredura volumétrica de um dos radares da rede do Departamento de Controle do Espaço Aéreo, foi obtida uma metodologia que permite a recuperação do vento médio horizontal. Além disso, com a sequência temporal dos perfis verticais do vento médio horizontal, foi possível efetuar o estudo bidimensional do comportamento dos campos médios de vento, divergência e refletividade, em uma linha de instabilidade, a partir da conversão da coordenada tempo em espaço pela velocidade de translação deste sistema. Utilizando o algoritmo de rastreamento de sistemas convectivos - ForTraCC, adaptado ao radar meteorológico, em operação na Divisão de Satélites e Sistemas Ambientais do Centro de Previsão do Tempo e Estudos Climáticos, estabeleceu-se uma climatologia dos deslocamentos dos sistemas precipitantes para a área de detecção do radar meteorológico, localizado na cidade de Santiago-RS, no período de setembro de 2007 a dezembro de 2008. Nesta climatologia, buscou-se ainda estabelecer padrões de deslocamento quanto à variação diurna e quanto ao tamanho dos sistemas precipitantes. Para a mesma área de detecção estipulada acima, foi elaborada uma classificação para os sistemas precipitantes, baseando-se no índice de Energia Potencial Convectiva Disponível (CAPE) e no cisalhamento do vento ("it{shear}"), obtidos da análise do "it{National Center for Environmental Prediction}" adaptada para grade de 20km do modelo Eta, para diversos tamanhos e refletividades máximas calculadas pelo ForTraCC-radar. Foi ainda elaborado um estudo sobre a possível influência do campo de instabilidade nos desvios (aparentes), em relação vetor vento médio da camada, durante a propagação dos sistemas precipitantes, investigando a influência do campo do CAPE distribuido em uma área de 100km ao redor do centro geométrico dos sistemas precipitantes detectados pelo radar meteorológico e computados pelo ForTraCC-radar. Neste estudo, parametrizou-se uma relação entre o vetor deslocamento aparente e o gradiente médio do CAPE, calculado para a área estipulada acima, para os deslocamentos dos sistemas precipitantes com duração do ciclo de vida de 1800s (30min). O radar meteorológico trouxe novas perspectivas para melhorar a compreensão dos fenômenos de mesoescala e, por isso, a preocupação em utilizá-los mais e melhor.

Using a technique named Least Square-Velocity Azimuth Display applied to the radial velocity data, obtained from volumetric scanning of one of the Departamento de Controle do Espaço Aéreo radars, a methodology was elaborated to retrieve the horizontal mean wind for several levels. Besides, with a time sequence of the mean wind vertical profiles, it was possible to study the wind bi-dimensional behavior, divergence and reflectivity media fields, within a squall line, by converting the time coordenate into space, from the translation speed of the system. By using an algorithm to track convective clouds named…

Advisors/Committee Members: Carlos Frederico de Angelis, Luiz Augusto Toledo Machado, Marcos Daisuke Oyama, Maria Assunção Faus da Silva Dias.

Subjects/Keywords: radar meteorológico; sistema precipitante; circulação de mesoescala; propagação; weather radar; precipitating system; mesoscale circulation; propagation

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Teixeira, M. A. d. B. (2010). Analysis of the trajectory and circulation of the precipitating systems. (Thesis). Instituto Nacional de Pesquisas Espaciais. Retrieved from http://urlib.net/sid.inpe.br/mtc-m19/2010/10.24.21.44

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):

Teixeira, Marco Aurelio de Barros. “Analysis of the trajectory and circulation of the precipitating systems.” 2010. Thesis, Instituto Nacional de Pesquisas Espaciais. Accessed February 27, 2021. http://urlib.net/sid.inpe.br/mtc-m19/2010/10.24.21.44.

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

MLA Handbook (7^th Edition):

Teixeira, Marco Aurelio de Barros. “Analysis of the trajectory and circulation of the precipitating systems.” 2010. Web. 27 Feb 2021.

Vancouver:

Teixeira MAdB. Analysis of the trajectory and circulation of the precipitating systems. [Internet] [Thesis]. Instituto Nacional de Pesquisas Espaciais; 2010. [cited 2021 Feb 27]. Available from: http://urlib.net/sid.inpe.br/mtc-m19/2010/10.24.21.44.

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

Council of Science Editors:

Teixeira MAdB. Analysis of the trajectory and circulation of the precipitating systems. [Thesis]. Instituto Nacional de Pesquisas Espaciais; 2010. Available from: http://urlib.net/sid.inpe.br/mtc-m19/2010/10.24.21.44

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

20. Rocha Filho, Kleber Lopes da. Modelagem Hidrológica da Bacia do Rio Pirajuçara com TOPMODEL, Telemetria e Radar Meteorológico.

Degree: Mestrado, Meteorologia, 2010, University of São Paulo

URL: http://www.teses.usp.br/teses/disponiveis/14/14133/tde-21062013-124917/ ;

►

A Bacia do Alto Tiete abriga cerca de 50% dos habitantes do Estado de São Paulo e é afetada freqüentemente por eventos de inundações. Uma… (more)

▼

A Bacia do Alto Tiete abriga cerca de 50% dos habitantes do Estado de São Paulo e é afetada freqüentemente por eventos de inundações. Uma das principais fontes de problemas é a alta impermeabilização devida à ocupação da superfície nas últimas décadas. Um dos seus tributários secundários, a bacia do Rio Pirajuçara se insere neste contexto e sofre com problemas da mesma natureza. A modelagem hidrológica permite uma análise do escoamento superficial nestes ambientes e é útil na previsão de vazões por meio de redes telemétricas e sensoriamento remoto. Entretanto, redes telemétricas apresentam problemas de representatividade espacial e exposição, radares meteorológicos, apesar da maior resolução espaço-temporal das estimativas de precipitação, possuem várias fontes de erros e incertezas. A principal delas se refere à relação ZR. Deste modo, a integração dessas medições e estimativas pode minimizar erros de ambas. O objetivo deste estudo é analisar aspectos hidrológicos da Bacia do Rio Pirajuçara por meio do modelo TOPMODEL com medições de vazão e precipitação disponíveis para 18 eventos monitorados entre outubro de 2008 a outubro de 2009. O modelo TOPMODEL foi calibrado com dez eventos e verificado com os demais. A calibração foi realizada com os dados da telemetria da Bacia do Alto Tietê, radar meteorológico de São Paulo e a combinação de ambos por meio da análise objetiva estatística. Os resultados da calibração indicam que o melhor desempenho foi obtido com radar meteorológico, com número de NASH de 0,51, menor erro quadrático médio e menor viés médio absoluto. A verificação também indicou o mesmo resultado com número de NASH de 0,69. As simulações indicam que apesar da utilização da precipitação média, o modelo TOPMODEL simulou adequadamente cerca de 75% das vazões de alerta. O trabalho evidencia as limitações da telemetria e seus impactos na integração com os dados do radar.

The Alto Tiete watershed is home for about 50% of the inhabitants of São Paulo State and is affected by recurrent flashfloods. One major source of difficulties is the high rate of soil impermeabilization caused by dense surface occupation in the last decades. One of its secondary tributaries, the Pirajussara watershed suffers with similar problems. Hydrological modeling allows the analysis of runoff and other variables in these basins. It also useful for streamflow forecast based on telemetric networks and remote sensing measurements. However, surface networks lack spatial representativity and exposure is a also a issue, weather radars, in spite of their much higher spatial and temporal resolution rainfall estimation, are affect by several sources of errors and uncertainties; the most significant one being the ZR relationship. Thus, the integration of these measurements and estimates can minimize errors of both. The goal of the present work is to analyze the surface hydrology of the Pirajussara watershed based on the TOPMODEL, streamflow and rainfall measurements available for eighteen events between October 2008 and October 2009. The…

Advisors/Committee Members: Pereira Filho, Augusto Jose.

Subjects/Keywords: Hydrologic Modeling; Modelagem Hidrológica; Radar meteorológico; Raingauge Network.; Redes de Superfície; TOPMODEL; TOPMODEL; Weather Radar

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Rocha Filho, K. L. d. (2010). Modelagem Hidrológica da Bacia do Rio Pirajuçara com TOPMODEL, Telemetria e Radar Meteorológico. (Masters Thesis). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/14/14133/tde-21062013-124917/ ;

Chicago Manual of Style (16^th Edition):

Rocha Filho, Kleber Lopes da. “Modelagem Hidrológica da Bacia do Rio Pirajuçara com TOPMODEL, Telemetria e Radar Meteorológico.” 2010. Masters Thesis, University of São Paulo. Accessed February 27, 2021. http://www.teses.usp.br/teses/disponiveis/14/14133/tde-21062013-124917/ ;.

MLA Handbook (7^th Edition):

Rocha Filho, Kleber Lopes da. “Modelagem Hidrológica da Bacia do Rio Pirajuçara com TOPMODEL, Telemetria e Radar Meteorológico.” 2010. Web. 27 Feb 2021.

Vancouver:

Rocha Filho KLd. Modelagem Hidrológica da Bacia do Rio Pirajuçara com TOPMODEL, Telemetria e Radar Meteorológico. [Internet] [Masters thesis]. University of São Paulo; 2010. [cited 2021 Feb 27]. Available from: http://www.teses.usp.br/teses/disponiveis/14/14133/tde-21062013-124917/ ;.

Council of Science Editors:

Rocha Filho KLd. Modelagem Hidrológica da Bacia do Rio Pirajuçara com TOPMODEL, Telemetria e Radar Meteorológico. [Masters Thesis]. University of São Paulo; 2010. Available from: http://www.teses.usp.br/teses/disponiveis/14/14133/tde-21062013-124917/ ;

21. Ribaud, Jean-François. Etude tridimensionnelle de l'activité électrique, microphysique et dynamique d'une ligne de grain observée pendant la campagne HyMeX : Three-dimensional lightning activity relative to microphysics and kinematics during a HyMeX quall line.

Degree: Docteur es, Physique de l'atmosphère, 2015, Université Toulouse III – Paul Sabatier

URL: http://www.theses.fr/2015TOU30353

►

La question de la prévision des évènements fortement précipitants se produisant sur le bassin Méditerranéen est au coeur du programme international HyMeX (Hydrological cycle in… (more)

▼

La question de la prévision des évènements fortement précipitants se produisant sur le bassin Méditerranéen est au coeur du programme international HyMeX (Hydrological cycle in Mediterranean EXperiment, http://www.hymex.org/) dont l'un des objectifs est d'améliorer la prévision et la prévention des risques hydrométéorologiques du bassin méditerranéen dans le contexte du changement climatique. Durant l'automne 2012, une campagne de mesures de deux mois dite "Période d'Observation Spéciale" (SOP1) a été menée afin de documenter les conditions propices à la formation et au développement des évènements convectifs de type cévenol souvent responsables de crues dévastatrices. Pendant cette SOP1 un dispositif instrumental sans précédent a été déployé avec notamment pour la première fois sur le sol français un imageur à haute résolution spatio-temporelle permettant d'observer les décharges électriques en trois dimensions : le Lightning Mapping Array (LMA). Cet instrument a été combiné aux radars du réseau ARAMIS de Météo-France, et plus précisément aux radars Doppler à diversité de polarisation dans le Sud-Est de la France qui offrent la possibilité d'obtenir des informations sur le type et la distribution des hydrométéores au sein des systèmes précipitants. La production d'éclairs étant le résultat d'une électrisation issue des interactions microphysiques (collisions entre graupels et cristaux de glace en suspension), une description détaillée des différents types d'hydrométéores présents dans les nuages convectifs est essentielle. Dans cette optique, les algorithmes d'identification des hydrométéores développés par Météo-France ont été évalués puis améliorés. Les résultats de cette étude ont montré que les restitutions entre les différents radars étaient plutôt cohérentes, à condition que l'information sur l'altitude de l'isotherme 0°C soit correcte. Ce travail a ensuite été complété par la création, via une méthode originale, de composites 3D d'hydrométéores permettant de décrire la microphysique majoritairement présente dans les systèmes convectifs observés pendant la campagne HyMeX. La deuxième partie de ce travail s'est basée sur l'exploitation de la synergie radar-LMA sur une ligne de grain observée durant la SOP1 de HyMeX. Les principales informations déduites de ce couplage ont mis en exergue l'importance des processus microphysiques intervenant dans l'électrisation du nuage d'orage, ainsi que l'impact du relief sur l'activité électrique globale du système convectif. Sur les quatre heures de données analysées du 24 Septembre 2012, le déclenchement et la propagation des éclairs ont majoritairement été observés dans les espèces microphysiques que sont le graupel, les cristaux de glace et dans une moindre mesure la grêle. Cette étude souligne également le rôle important de la topographie sur l'activité électrique et montre que le passage d'un faible relief peut dramatiquement influencer la distribution et l'intensité des éclairs dans les régions convectives.

The Hydrological cycle in Mediterranean Experiment (HyMeX,…

Advisors/Committee Members: Coquillat, Sylvain (thesis director), Bousquet, Olivier (thesis director).

Subjects/Keywords: Orages; Eclairs; Radar polarimétrique; LMA; Dynamique; Microphysique; Thunderstorms; Lightning; Weather radar; LMA; Cloud dynamics; Microphysics

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Ribaud, J. (2015). Etude tridimensionnelle de l'activité électrique, microphysique et dynamique d'une ligne de grain observée pendant la campagne HyMeX : Three-dimensional lightning activity relative to microphysics and kinematics during a HyMeX quall line. (Doctoral Dissertation). Université Toulouse III – Paul Sabatier. Retrieved from http://www.theses.fr/2015TOU30353

Chicago Manual of Style (16^th Edition):

Ribaud, Jean-François. “Etude tridimensionnelle de l'activité électrique, microphysique et dynamique d'une ligne de grain observée pendant la campagne HyMeX : Three-dimensional lightning activity relative to microphysics and kinematics during a HyMeX quall line.” 2015. Doctoral Dissertation, Université Toulouse III – Paul Sabatier. Accessed February 27, 2021. http://www.theses.fr/2015TOU30353.

MLA Handbook (7^th Edition):

Ribaud, Jean-François. “Etude tridimensionnelle de l'activité électrique, microphysique et dynamique d'une ligne de grain observée pendant la campagne HyMeX : Three-dimensional lightning activity relative to microphysics and kinematics during a HyMeX quall line.” 2015. Web. 27 Feb 2021.

Vancouver:

Ribaud J. Etude tridimensionnelle de l'activité électrique, microphysique et dynamique d'une ligne de grain observée pendant la campagne HyMeX : Three-dimensional lightning activity relative to microphysics and kinematics during a HyMeX quall line. [Internet] [Doctoral dissertation]. Université Toulouse III – Paul Sabatier; 2015. [cited 2021 Feb 27]. Available from: http://www.theses.fr/2015TOU30353.

Council of Science Editors:

Ribaud J. Etude tridimensionnelle de l'activité électrique, microphysique et dynamique d'une ligne de grain observée pendant la campagne HyMeX : Three-dimensional lightning activity relative to microphysics and kinematics during a HyMeX quall line. [Doctoral Dissertation]. Université Toulouse III – Paul Sabatier; 2015. Available from: http://www.theses.fr/2015TOU30353

Brno University of Technology

22. Brada, Michal. Návrh pohonu natáčení monitorovací paraboly: Motion drive recording of monitoring dishes.

Degree: 2019, Brno University of Technology

URL: http://hdl.handle.net/11012/14790

► This bachelor’s thesis deals with construction of drive unit for setup accurate azimuth and elevation of weather radar. This thesis is consist of several parts.… (more)

Subjects/Keywords: Meteorologický radar; pohonná jednotka; krokový motor; Weather radar; drive unit; stepper motor

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Brada, M. (2019). Návrh pohonu natáčení monitorovací paraboly: Motion drive recording of monitoring dishes. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/14790

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):

Brada, Michal. “Návrh pohonu natáčení monitorovací paraboly: Motion drive recording of monitoring dishes.” 2019. Thesis, Brno University of Technology. Accessed February 27, 2021. http://hdl.handle.net/11012/14790.

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

MLA Handbook (7^th Edition):

Brada, Michal. “Návrh pohonu natáčení monitorovací paraboly: Motion drive recording of monitoring dishes.” 2019. Web. 27 Feb 2021.

Vancouver:

Brada M. Návrh pohonu natáčení monitorovací paraboly: Motion drive recording of monitoring dishes. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/11012/14790.

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

Council of Science Editors:

Brada M. Návrh pohonu natáčení monitorovací paraboly: Motion drive recording of monitoring dishes. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/14790

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

University of Oklahoma

23. Schvartzman, David. Signal Processing Techniques and Concept of Operations for Polarimetric Rotating Phased Array Radar.

Degree: PhD, 2020, University of Oklahoma

URL: http://hdl.handle.net/11244/326580

► The Weather Surveillance Radar 1988 Doppler (WSR-88D) network has been operational for over 30 years and is still the primary observational instrument employed by the… (more)

▼ The Weather Surveillance Radar 1988 Doppler (WSR-88D) network has been operational for over 30 years and is still the primary observational instrument employed by the National Weather Service (NWS) forecasters to support their critical mission of issuing severe weather warnings and forecasts in the United States. Nevertheless, the WSR-88Ds have exceeded their engineering design lifespan and are projected to reach the end of operational lifetime by 2040. Technological limitations may prevent the WSR-88D to meet demanding functional requirements for future observational needs. The National Oceanic and Atmospheric Administration (NOAA) has started considering radar systems with advanced capabilities for the eventual replacement of the WSR-88D. Unique and flexible capabilities offered by Phased Array Radar (PAR) technology support the required enhanced weather surveillance strategies that are envisioned to improve the weather radar products, making PAR technology an attractive candidate for the next generation of weather radars. If PAR technology is to replace the operational WSR-88D, important decisions must be made regarding the architecture that will be needed to meet the functional requirements. A four-faced planar PAR (4F-PAR) is expected to achieve the requirements set forth by NOAA and the NWS, but deploying and maintaining an operational network of these radars across the U.S. will likely be unaffordable. A more affordable alternative radar system is based on a single-face Rotating PAR (RPAR) architecture, which is capable of exceeding the functionality provided by the WSR-88D network. This dissertation is focused on exploring advanced RPAR scanning techniques in support of meeting future radar functional requirements. A survey of unique RPAR capabilities is conducted to determine which ones could be exploited under an RPAR Concept of Operations (CONOPS). Three capabilities are selected for further investigation: beam agility, digital beamforming, and dwell flexibility. The RPARs beam agility is exploited to minimize the beam smearing that results from the rotation of the antenna system over the collection of samples in the coherent processing interval. The use of digital beamforming is investigated as a possible way to reduce the scan time and/or the variance of estimates. The RPAR's dwell flexibility capability is explored as a possible way to tailor the scan to meteorological observations with the goal of improving data quality. Three advanced RPAR scanning techniques are developed exploiting these capabilities, and their performance in support of meeting the radar functional requirements is quantified. The proposed techniques are implemented on the Advanced Technology Demonstrator (ATD), a dual-polarization RPAR system at the National Severe Storms Laboratory (NSSL) in Norman, OK. Data collection experiments are conducted with the ATD to demonstrate the performance of the proposed techniques for dual-polarization observations. Results are verified by quantitatively comparing fields of radar-variable… Advisors/Committee Members: Yu, Tian-You (advisor), Torres, Sebastian (committee member), Yeary, Mark (committee member), Salazar-Cerreno, Jorge (committee member), Wang, Ying (committee member).

Subjects/Keywords: Weather Radar; Polarimetric Phased Array Radar; Signal Processing; Concept of Operations; Digital Beamdorming

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Schvartzman, D. (2020). Signal Processing Techniques and Concept of Operations for Polarimetric Rotating Phased Array Radar. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/326580

Chicago Manual of Style (16^th Edition):

Schvartzman, David. “Signal Processing Techniques and Concept of Operations for Polarimetric Rotating Phased Array Radar.” 2020. Doctoral Dissertation, University of Oklahoma. Accessed February 27, 2021. http://hdl.handle.net/11244/326580.

MLA Handbook (7^th Edition):

Schvartzman, David. “Signal Processing Techniques and Concept of Operations for Polarimetric Rotating Phased Array Radar.” 2020. Web. 27 Feb 2021.

Vancouver:

Schvartzman D. Signal Processing Techniques and Concept of Operations for Polarimetric Rotating Phased Array Radar. [Internet] [Doctoral dissertation]. University of Oklahoma; 2020. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/11244/326580.

Council of Science Editors:

Schvartzman D. Signal Processing Techniques and Concept of Operations for Polarimetric Rotating Phased Array Radar. [Doctoral Dissertation]. University of Oklahoma; 2020. Available from: http://hdl.handle.net/11244/326580

Colorado State University

24. Chen, Haonan. Radar and satellite observations of precipitation: space time variability, cross-validation, and fusion.

Degree: PhD, Electrical and Computer Engineering, 2017, Colorado State University

URL: http://hdl.handle.net/10217/185786

► Rainfall estimation based on satellite measurements has proven to be very useful for various applications. A number of precipitation products at multiple time and space… (more)

▼ Rainfall estimation based on satellite measurements has proven to be very useful for various applications. A number of precipitation products at multiple time and space scales have been developed based on satellite observations. For example, the National Oceanic and Atmospheric Administration (NOAA) Climate Prediction Center has developed a morphing technique (i.e., CMORPH) to produce global precipitation products by combining existing space-based observations and retrievals. The CMORPH products are derived using infrared (IR) brightness temperature information observed by geostationary satellites and passive microwave-(PMW) based precipitation retrievals from low earth orbit satellites. Although space-based precipitation products provide an excellent tool for regional, local, and global hydrologic and climate studies as well as improved situational awareness for operational forecasts, their accuracy is limited due to restrictions of spatial and temporal sampling and the applied parametric retrieval algorithms, particularly for light precipitation or extreme events such as heavy rain. In contrast, ground-based radar is an excellent tool for quantitative precipitation estimation (QPE) at finer space-time scales compared to satellites. This is especially true after the implementation of dual-polarization upgrades and further enhancement by urban scale X-band radar networks. As a result, ground radars are often critical for local scale rainfall estimation and for enabling forecasters to issue severe weather watches and warnings. Ground-based radars are also used for validation of various space measurements and products. In this study, a new S-band dual-polarization radar rainfall algorithm (DROPS2.0) is developed that can be applied to the National Weather Service (NWS) operational Weather Surveillance Radar-1988 Doppler (WSR-88DP) network. In addition, a real-time high-resolution QPE system is developed for the Engineering Research Center for Collaborative Adaptive Sensing of the Atmosphere (CASA) Dallas-Fort Worth (DFW) dense radar network, which is deployed for urban hydrometeorological applications via high-resolution observations of the lower atmosphere. The CASA/DFW QPE system is based on the combination of a standard WSR-88DP (i.e., KFWS radar) and a high-resolution dual-polarization X-band radar network. The specific radar rainfall methodologies at Sand X-band frequencies, as well as the fusion methodology merging radar observations at different temporal resolutions are investigated. Comparisons between rainfall products from the DFW radar network and rainfall measurements from rain gauges are conducted for a large number of precipitation events over several years of operation, demonstrating the excellent performance of this urban QPE system. The real-time DFW QPE products are extensively used for flood warning operations and hydrological modelling. The high-resolution DFW QPE products also serve as a reliable dataset for validation of Global Precipitation Measurement (GPM) satellite precipitation products. This… Advisors/Committee Members: Chandrasekar, V. (advisor), Reising, Steven C. (committee member), Cheney, Margaret (committee member), Mielke, Paul W. (committee member).

Subjects/Keywords: machine learning; remote sensing; weather radar network; quantitative precipitation estimation (QPE); dual-polarization radar; satellite

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Chen, H. (2017). Radar and satellite observations of precipitation: space time variability, cross-validation, and fusion. (Doctoral Dissertation). Colorado State University. Retrieved from http://hdl.handle.net/10217/185786

Chicago Manual of Style (16^th Edition):

Chen, Haonan. “Radar and satellite observations of precipitation: space time variability, cross-validation, and fusion.” 2017. Doctoral Dissertation, Colorado State University. Accessed February 27, 2021. http://hdl.handle.net/10217/185786.

MLA Handbook (7^th Edition):

Chen, Haonan. “Radar and satellite observations of precipitation: space time variability, cross-validation, and fusion.” 2017. Web. 27 Feb 2021.

Vancouver:

Chen H. Radar and satellite observations of precipitation: space time variability, cross-validation, and fusion. [Internet] [Doctoral dissertation]. Colorado State University; 2017. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10217/185786.

Council of Science Editors:

Chen H. Radar and satellite observations of precipitation: space time variability, cross-validation, and fusion. [Doctoral Dissertation]. Colorado State University; 2017. Available from: http://hdl.handle.net/10217/185786

Indian Institute of Science

25. Bhattacharya, Anwesa. Cloud Properties Over SHAR Region Derived From Weather RADAR Data.

Degree: MSc Engg, Faculty of Engineering, 2011, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/1009

► Weather radars are increasingly used for the study of clouds, understanding the precipitation systems and also for forecasting very short range weather (one hour to… (more)

▼ Weather radars are increasingly used for the study of clouds, understanding the precipitation systems and also for forecasting very short range weather (one hour to a few hours). Now, Doppler Weather Radar (DWR) data are available in India and it is possible to study cloud properties at fine temporal and spatial scales. Radar is a complex system and calibration of a radar is not an easy job. But derived cloud properties strongly depend on the absolute magnitude of the reflectivity. Therefore, there is a need to check how data from two or more radars compare if they measure a common volume. Chennai and SHAR radars are within 66 km from each other, and the data collected during their calibration and intercomparison experiment in 2006 enables the comparison of their reflectivity(Z) values. Individual reflectivity are compared after plotting SHAR versus Chennai in a scatter plot. Fitting a least square linear best fit line shows that the intercept has a value around 6 dBZ and the slope of the line is 1.06. Thus, there is a trend as well, and the difference between the two radars increase with Z, and for Z around 40 dBZ (for SHAR DWR), the difference between the two is around 8.5 dBZ. Visual intercomparison also validated the results. Data from the two radars are compared with Precipitation Radar (PR) data on board TRMM satellite. TRMM radar slightly overestimates compared to Chennai radar above the range of 30 dBZ. After standardized, SHAR data is used for understanding the evolution and propagation of cloud systems. The diurnal variation in convection is strong in the study region, with increase around local evening and morning and weakening around midnight except in December. Average liquid water content in the clouds is about 0.5 gm/m3. There is some seasonal dependence but no clear dependence on cloud size. Smaller systems of May have more liquid water content compared to larger ones. For nowcasting vertically projected maximum reflectivity is taken. A threshold of 30 dBZ is set to identify the cloud systems. Both center of gravity tracking (CG) and cross-correlation (CC) methods are used to track them. Frequent merging and splitting is common in the clouds which makes storm tracking difficult. Tracking by CC is giving better result than that by the CG method in the case of large systems (i.e., clusters). For smaller systems (individual cloud systems), CC method gives better result than CG method but not as good as cluster. Advisors/Committee Members: Bhat, G S (advisor).

Subjects/Keywords: Meteorology; Cloud Formation (Climatology); Radar Data; Shar Region; Weather Radar; Cloud/Storm Tracking; Meteorological Radar; Convective Clouds; Radar Meteorology; Convection (Meteorology); Clouds - Diurnal Variation; Doppler Weather Radar Data; Doppler Weather Radar (DWR); Clouds; Meteorology

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Bhattacharya, A. (2011). Cloud Properties Over SHAR Region Derived From Weather RADAR Data. (Masters Thesis). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/1009

Chicago Manual of Style (16^th Edition):

Bhattacharya, Anwesa. “Cloud Properties Over SHAR Region Derived From Weather RADAR Data.” 2011. Masters Thesis, Indian Institute of Science. Accessed February 27, 2021. http://etd.iisc.ac.in/handle/2005/1009.

MLA Handbook (7^th Edition):

Bhattacharya, Anwesa. “Cloud Properties Over SHAR Region Derived From Weather RADAR Data.” 2011. Web. 27 Feb 2021.

Vancouver:

Bhattacharya A. Cloud Properties Over SHAR Region Derived From Weather RADAR Data. [Internet] [Masters thesis]. Indian Institute of Science; 2011. [cited 2021 Feb 27]. Available from: http://etd.iisc.ac.in/handle/2005/1009.

Council of Science Editors:

Bhattacharya A. Cloud Properties Over SHAR Region Derived From Weather RADAR Data. [Masters Thesis]. Indian Institute of Science; 2011. Available from: http://etd.iisc.ac.in/handle/2005/1009

Texas A&M University

26. Fliegel, Jonathan 1988-. Quality Control and Census of SMART-R Observations from the DYNAMO/CINDY2011 Field Campaign.

Degree: MS, Atmospheric Sciences, 2012, Texas A&M University

URL: http://hdl.handle.net/1969.1/148108

► The Shared Mobile Atmospheric Research and Teaching Radar (SMART-R) is a truck-mounted C-band, Doppler radar that was deployed during the Dynamics of the Madden-Julian Oscillation… (more)

▼ The Shared Mobile Atmospheric Research and Teaching Radar (SMART-R) is a truck-mounted C-band, Doppler radar that was deployed during the Dynamics of the Madden-Julian Oscillation (DYNAMO) / Cooperative Indian Ocean Experiment on interseasonal variability in the year 2011 (CINDY2011) campaign on Addu Atoll, Maldives. One of SMART-R’s objectives was to provide continuous volume scans of precipitating clouds during all phases of the Madden-Julian Oscillation (MJO) for the full duration of the campaign. Data from SMART-R is available for 2 October 2011 through 9 February 2012. Every 10 minutes a full volume scan was produced, which was subsequently run through quality control algorithms that, among other filters, performed a calibration correction, noise filtering, and an attenuation correction. It was observed that data from SMART-R appeared to be slanted towards the WNW, and after analysis, a 0.75◦ tilt correction was applied towards azimuth 285◦. The data was then converted into Cartesian coordinates and an additional noise filter was applied. NETCDF files with radial velocities and corrected reflectivity were produced. From the reflectivity observations, a suite of products including rain maps, echo- top heights and convective/stratiform separations were produced. A modified version of the convective/stratiform separation was developed in an attempt to classify shallow and weak convection more correctly. The modified algorithm utilizes an isolation parameter set to 10 km to the north, south, east, and west, a 10-dBz echo-top height threshold set to 9 km, and a 16-dBz reflectivity threshold at 3 km to ensure only isolated, shallow, and weak rain originally classified as stratiform, is reclassified as convection. Analyses of these products clearly suggest two MJO events occurring in October and November as indicated by the Wheeler and Hendon Multivariate MJO index. While stratiform rain almost always encompassed a larger area of the radar domain, convective rain was the larger producer of rain with the exception of active MJO periods. In addition, echo-top height counts are observed to increase in both vertical structure and frequency as the MJO initiates and becomes active over the radar domain. Possible connections are also made between echo-top height data and humidity retrievals from soundings launched on Addu Atoll. It appears that during MJO initiation, convective echo tops lead the moistening of the mid troposphere, while during suppressed phases, the convective echo tops lag behind the moistening of the mid troposphere. Wind shear also appears to be weaker during an active MJO event, and increase as the active MJO exits the region. From these observations, as well as other rain statistics including the diurnal cycle, indicators for a localized MJO index are proposed that are based on local radar and sounding data, rather than satellite and reanalysis observations of wind and outgoing long-wave radiation. Advisors/Committee Members: Schumacher, Courtney (advisor), Korty, Robert (committee member), Washington-Allen, Robert (committee member).

Subjects/Keywords: Convective/Stratiform Separation; Weather Radar; SMART-R; MJO; Madden-Julian Oscillation

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Fliegel, J. 1. (2012). Quality Control and Census of SMART-R Observations from the DYNAMO/CINDY2011 Field Campaign. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/148108

Chicago Manual of Style (16^th Edition):

Fliegel, Jonathan 1988-. “Quality Control and Census of SMART-R Observations from the DYNAMO/CINDY2011 Field Campaign.” 2012. Masters Thesis, Texas A&M University. Accessed February 27, 2021. http://hdl.handle.net/1969.1/148108.

MLA Handbook (7^th Edition):

Fliegel, Jonathan 1988-. “Quality Control and Census of SMART-R Observations from the DYNAMO/CINDY2011 Field Campaign.” 2012. Web. 27 Feb 2021.

Vancouver:

Fliegel J1. Quality Control and Census of SMART-R Observations from the DYNAMO/CINDY2011 Field Campaign. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/1969.1/148108.

Council of Science Editors:

Fliegel J1. Quality Control and Census of SMART-R Observations from the DYNAMO/CINDY2011 Field Campaign. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/148108

Indian Institute of Science

27. Makkapati, Vishnu Vardhan. Ultra High Compression For Weather Radar Reflectivity Data.

Degree: MSc Engg, Faculty of Engineering, 2009, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/389

► Weather is a major contributing factor in aviation accidents, incidents and delays. Doppler weather radar has emerged as a potent tool to observe weather. Aircraft… (more)

▼ Weather is a major contributing factor in aviation accidents, incidents and delays. Doppler weather radar has emerged as a potent tool to observe weather. Aircraft carry an onboard radar but its range and angular resolution are limited. Networks of ground-based weather radars provide extensive coverage of weather over large geographic regions. It would be helpful if these data can be transmitted to the pilot. However, these data are highly voluminous and the bandwidth of the ground-air communication links is limited and expensive. Hence, these data have to be compressed to an extent where they are suitable for transmission over low-bandwidth links. Several methods have been developed to compress pictorial data. General-purpose schemes do not take into account the nature of data and hence do not yield high compression ratios. A scheme for extreme compression of weather radar data is developed in this thesis that does not significantly degrade the meteorological information contained in these data. The method is based on contour encoding. It approximates a contour by a set of systematically chosen ‘control’ points that preserve its fine structure upto a certain level. The contours may be obtained using a thresholding process based on NWS or custom reflectivity levels. This process may result in region and hole contours, enclosing ‘high’ or ‘low’ areas, which may be nested. A tag bit is used to label region and hole contours. The control point extraction method first obtains a smoothed reference contour by averaging the original contour. Then the points on the original contour with maximum deviation from the smoothed contour between the crossings of these contours are identified and are designated as control points. Additional control points are added midway between the control point and the crossing points on either side of it, if the length of the segment between the crossing points exceeds a certain length. The control points, referenced with respect to the top-left corner of each contour for compact quantification, are transmitted to the receiving end. The contour is retrieved from the control points at the receiving end using spline interpolation. The region and hole contours are identified using the tag bit. The pixels between the region and hole contours at a given threshold level are filled using the color corresponding to it. This method is repeated till all the contours for a given threshold level are exhausted, and the process is carried out for all other thresholds, thereby resulting in a composite picture of the reconstructed field. Extensive studies have been conducted by using metrics such as compression ratio, fidelity of reconstruction and visual perception. In particular the effect of the smoothing factor, the choice of the degree of spline interpolation and the choice of thresholds are studied. It has been shown that a smoothing percentage of about 10% is optimal for most data. A degree 2 of spline interpolation is found to be best suited for smooth contour reconstruction. Augmenting NWS thresholds… Advisors/Committee Members: Mahapatra, Pravas R (advisor).

Subjects/Keywords: Aviation Meteorology; Weather Radar; Weather Radar Data Compression; Contour Encoding; Meteorological Radar; Weather Radar Data Encoding; Weather Data; Aeronautics

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Makkapati, V. V. (2009). Ultra High Compression For Weather Radar Reflectivity Data. (Masters Thesis). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/389

Chicago Manual of Style (16^th Edition):

Makkapati, Vishnu Vardhan. “Ultra High Compression For Weather Radar Reflectivity Data.” 2009. Masters Thesis, Indian Institute of Science. Accessed February 27, 2021. http://etd.iisc.ac.in/handle/2005/389.

MLA Handbook (7^th Edition):

Makkapati, Vishnu Vardhan. “Ultra High Compression For Weather Radar Reflectivity Data.” 2009. Web. 27 Feb 2021.

Vancouver:

Makkapati VV. Ultra High Compression For Weather Radar Reflectivity Data. [Internet] [Masters thesis]. Indian Institute of Science; 2009. [cited 2021 Feb 27]. Available from: http://etd.iisc.ac.in/handle/2005/389.

Council of Science Editors:

Makkapati VV. Ultra High Compression For Weather Radar Reflectivity Data. [Masters Thesis]. Indian Institute of Science; 2009. Available from: http://etd.iisc.ac.in/handle/2005/389

University of Adelaide

28. Anderson, Nathan John. Effects of the troposphere upon radio communications and implications for weather measurement.

Degree: 2018, University of Adelaide

URL: http://hdl.handle.net/2440/118192

► The aim of this research is to use observations of Very High Frequency (VHF) radio wave propagation to estimate the refractive index of air over… (more)

Subjects/Keywords: Radio waves; propagation; refractivity; passive bistatic radar techniques; weather prediction models

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Anderson, N. J. (2018). Effects of the troposphere upon radio communications and implications for weather measurement. (Thesis). University of Adelaide. Retrieved from http://hdl.handle.net/2440/118192

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):

Anderson, Nathan John. “Effects of the troposphere upon radio communications and implications for weather measurement.” 2018. Thesis, University of Adelaide. Accessed February 27, 2021. http://hdl.handle.net/2440/118192.

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

MLA Handbook (7^th Edition):

Anderson, Nathan John. “Effects of the troposphere upon radio communications and implications for weather measurement.” 2018. Web. 27 Feb 2021.

Vancouver:

Anderson NJ. Effects of the troposphere upon radio communications and implications for weather measurement. [Internet] [Thesis]. University of Adelaide; 2018. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/2440/118192.

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

Council of Science Editors:

Anderson NJ. Effects of the troposphere upon radio communications and implications for weather measurement. [Thesis]. University of Adelaide; 2018. Available from: http://hdl.handle.net/2440/118192

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

University of KwaZulu-Natal

29. Gutsa, Tadiwanashe Simpson. An assessment of radar, gauge and kriged gauge rainfall data in Free State, South Africa.

Degree: 2019, University of KwaZulu-Natal

URL: https://researchspace.ukzn.ac.za/handle/10413/18673

► In the last decades, flooding has caused significant damages and death in South Africa. Flooding is associated with heavy rainfall events which vary largely in… (more)

▼ In the last decades, flooding has caused significant damages and death in South Africa. Flooding is associated with heavy rainfall events which vary largely in space and time. The forecast of such phenomena requires quality rainfall data to generate output with a reasonably high degree of confidence. This study aims to document the difference of rainfall estimates derived from radar, rain gauge and a kriged rain gauge network. A review on the use of weather radar in hydrological studies shows that there is an opportunity of using radar estimates in near-real time flood forecasting and warning applications. The quality of radar rainfall estimates is assessed using pluviometer rain gauges and a daily kriged rain gauge surface in the Vaalsub-catchment in the Free State, South Africa. The study uses data from the MRL5 S-band radar located at Bethlehem and from rain gauges within weather stations operated by South African Weather Services (SAWS). The analysis assesses the effect of rainfall seasonality, radar range dependencies and storm variation on the quality of estimated rainfall accumulations. In addition,gauge density is analysed to determine the effect it has on the performance of kriging estimation.During the research notable spatial rainfall variation and areas with quality radar estimates have been identified. The results show that there exists a seasonal bias between radar and rain gauge estimates with the radar underestimating low intensity gauge rainfall pronouncedly during the winter rainfall events by an average of 31%. The underestimation of rainfall by the MRL5 radar increases as we move away from the radar tower. During the summer rainfall events the radar estimates are almost similar to point gauge estimates especially during late summer (February and March) . Radar underestimation of winter rainfall is probably due to overshooting of the tops of stratiform rainfall by the radar beam. Correlations are high between MRL5 radar and rain gauges during summer rainfall events ranging between 0.7 and 1. Results from this study provide information to guide on the application and selection of rainfall estimation techniques. Advisors/Committee Members: Kumarasamy, Muthukrishna Vellaisamy. (advisor), Pegram, Geoffrey Guy Sinclair. (advisor).

Subjects/Keywords: Rain gauge.; Rainfall data.; Flooding.; Weather radar.; Hydrological studies.; Kriging.

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Gutsa, T. S. (2019). An assessment of radar, gauge and kriged gauge rainfall data in Free State, South Africa. (Thesis). University of KwaZulu-Natal. Retrieved from https://researchspace.ukzn.ac.za/handle/10413/18673

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):

Gutsa, Tadiwanashe Simpson. “An assessment of radar, gauge and kriged gauge rainfall data in Free State, South Africa.” 2019. Thesis, University of KwaZulu-Natal. Accessed February 27, 2021. https://researchspace.ukzn.ac.za/handle/10413/18673.

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

MLA Handbook (7^th Edition):

Gutsa, Tadiwanashe Simpson. “An assessment of radar, gauge and kriged gauge rainfall data in Free State, South Africa.” 2019. Web. 27 Feb 2021.

Vancouver:

Gutsa TS. An assessment of radar, gauge and kriged gauge rainfall data in Free State, South Africa. [Internet] [Thesis]. University of KwaZulu-Natal; 2019. [cited 2021 Feb 27]. Available from: https://researchspace.ukzn.ac.za/handle/10413/18673.

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

Council of Science Editors:

Gutsa TS. An assessment of radar, gauge and kriged gauge rainfall data in Free State, South Africa. [Thesis]. University of KwaZulu-Natal; 2019. Available from: https://researchspace.ukzn.ac.za/handle/10413/18673

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

University of Melbourne

30. Samarasekera, Senaka. A Bayesian signal processing framework for dual polarized weather radar.

Degree: 2015, University of Melbourne

URL: http://hdl.handle.net/11343/112409

► Current Weather radar algorithms for rain micro-physical parameter estimation do not make optimal use of the micro-physical models that govern the rain drop states. This… (more)

Subjects/Keywords: weather radar; micro-physical models; sequential Monte - Carlo sampler

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Samarasekera, S. (2015). A Bayesian signal processing framework for dual polarized weather radar. (Doctoral Dissertation). University of Melbourne. Retrieved from http://hdl.handle.net/11343/112409

Chicago Manual of Style (16^th Edition):

Samarasekera, Senaka. “A Bayesian signal processing framework for dual polarized weather radar.” 2015. Doctoral Dissertation, University of Melbourne. Accessed February 27, 2021. http://hdl.handle.net/11343/112409.

MLA Handbook (7^th Edition):

Samarasekera, Senaka. “A Bayesian signal processing framework for dual polarized weather radar.” 2015. Web. 27 Feb 2021.

Vancouver:

Samarasekera S. A Bayesian signal processing framework for dual polarized weather radar. [Internet] [Doctoral dissertation]. University of Melbourne; 2015. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/11343/112409.

Council of Science Editors:

Samarasekera S. A Bayesian signal processing framework for dual polarized weather radar. [Doctoral Dissertation]. University of Melbourne; 2015. Available from: http://hdl.handle.net/11343/112409

		in
And / Or
		in
And / Or
		in
And / Or
		in

Open Access Theses and Dissertations