subject:(synthetic aperture radar)

Colorado State University

1. Waddington, Chad. Synthetic aperture source localization.

Degree: PhD, Mathematics, 2018, Colorado State University

URL: http://hdl.handle.net/10217/191271

► The detection and localization of sources of electromagnetic (EM) radiation has many applications in both civilian and defense communities. The goal of source localization is… (more)

▼ The detection and localization of sources of electromagnetic (EM) radiation has many applications in both civilian and defense communities. The goal of source localization is to identify the geographic position of an emitter of some radiation from measurements of the elds that the source produces. Although the problem has been studied intensively for many decades much work remains to be done. Many state-of-the-art methods require large numbers of sensors and perform poorly or require additional sensors when target emitters transmit highly correlated waveforms. Some methods also require a preprocessing step which attempts to identify regions of the data which come from emitters in the scene before processing the localization algorithm. Additionally, it has been proven that pure Angle of Arrival (AOA) techniques based on current methods are always suboptimal when multiple emitters are present. We present a new source localization technique which employs a cross correlation measure of the Time Dierence of Arrival (TDOA) for signals recorded at two separate platforms, at least one of which is in motion. This data is then backprojected through a Synthetic Aperture Radar (SAR)-like process to form an image of the locations of the emitters in a target scene. This method has the advantage of not requiring any a priori knowledge of the number of emitters in the scene. Nor does it rest on an ability to identify regions of the data which come from individual emitters, though if this capability is present it may improve image quality. Additionally we demonstrate that this method is capable of localizing emitters which transmit highly correlated waveforms, though complications arise when several such emitters are present in the scene. We discuss these complications and strategies to mitigate them. Finally we conclude with an overview of our method's performance for various levels of additive noise and lay out a path for advancing study of this new method through future work. Advisors/Committee Members: Cheney, Margaret (advisor), Pinaud, Oliver (committee member), Mueller, Jennifer (committee member), Given, James (committee member), Yang, Liuqing (committee member).

Subjects/Keywords: synthetic aperture radar; source localization

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APA (6^th Edition):

Waddington, C. (2018). Synthetic aperture source localization. (Doctoral Dissertation). Colorado State University. Retrieved from http://hdl.handle.net/10217/191271

Chicago Manual of Style (16^th Edition):

Waddington, Chad. “Synthetic aperture source localization.” 2018. Doctoral Dissertation, Colorado State University. Accessed January 23, 2021. http://hdl.handle.net/10217/191271.

MLA Handbook (7^th Edition):

Waddington, Chad. “Synthetic aperture source localization.” 2018. Web. 23 Jan 2021.

Vancouver:

Waddington C. Synthetic aperture source localization. [Internet] [Doctoral dissertation]. Colorado State University; 2018. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/10217/191271.

Council of Science Editors:

Waddington C. Synthetic aperture source localization. [Doctoral Dissertation]. Colorado State University; 2018. Available from: http://hdl.handle.net/10217/191271

University of Edinburgh

2. Tierney, Claire. Adaptive waveform design for SAR in a crowded spectrum.

Degree: PhD, 2019, University of Edinburgh

URL: http://hdl.handle.net/1842/35589

► This thesis concerns the development of an adaptive waveform design scheme for synthetic aperture radar (SAR) to support its operation in the increasingly crowded radio… (more)

▼ This thesis concerns the development of an adaptive waveform design scheme for synthetic aperture radar (SAR) to support its operation in the increasingly crowded radio frequency (RF) spectrum, focusing on mitigating the effects of external RF interference. The RF spectrum is a finite resource and the rapid expansion of the telecommunications industry has seen radar users face a significant restriction in the range of available operational frequencies. This crowded spectrum scenario leads to increased likelihood of RF interference either due to energy leakage from neighbouring spectral users or from unlicensed transmitters. SAR is a wide bandwidth radar imaging mode which exploits the motion of the radar platform to form an image using multiple one dimensional profiles of the scene of interest known as the range profile. Due to its wideband nature, SAR is particularly vulnerable to RF interference which causes image impairments and overall reduction in quality. Altering the approach for radar energy transmission across the RF spectrum is now imperative to continue effective operation. Adaptive waveforms have recently become feasible for implementation and offer the much needed flexibility in the choice and control over radar transmission. However, there is a critically small processing time frame between waveform reception and transmission, which necessitates the use of computationally efficient processing algorithms to use adaptivity effectively. This simulation-based study provides a first look at adaptive waveform design for SAR to mitigate the detrimental effects of RF interference on a pulse-to-pulse basis. Standard SAR systems rely on a fixed waveform processing format on reception which restricts its potential to reap the benefits of adaptive waveform design. Firstly, to support waveform design for SAR, system identification techniques are applied to construct an alternative receive processing method which allows flexibility in waveform type. This leads to the main contribution of the thesis which is the formation of an adaptive spectral waveform design scheme. A computationally efficient closed-form expression for the waveform spectrum that minimizes the error in the estimate of the SAR range profile on a pulse to pulse basis is derived. The range profile and the spectrum of the interference are estimated at each pulse. The interference estimate is then used to redesign the proceeding waveform for estimation of the range profile at the next radar platform position. The solution necessitates that the energy is spread across the spectrum such that it competes with the interferer. The scenario where the waveform admits gaps in the spectrum in order to mitigate the effects of the interference is also detailed and is the secondary major thesis contribution. A series of test SAR images demonstrate the efficacy of these techniques and yield reduced interference effects compared to the standard SAR waveform.

Subjects/Keywords: Synthetic Aperture Radar; SAR; radar; interference mitigation

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APA (6^th Edition):

Tierney, C. (2019). Adaptive waveform design for SAR in a crowded spectrum. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/35589

Chicago Manual of Style (16^th Edition):

Tierney, Claire. “Adaptive waveform design for SAR in a crowded spectrum.” 2019. Doctoral Dissertation, University of Edinburgh. Accessed January 23, 2021. http://hdl.handle.net/1842/35589.

MLA Handbook (7^th Edition):

Tierney, Claire. “Adaptive waveform design for SAR in a crowded spectrum.” 2019. Web. 23 Jan 2021.

Vancouver:

Tierney C. Adaptive waveform design for SAR in a crowded spectrum. [Internet] [Doctoral dissertation]. University of Edinburgh; 2019. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/1842/35589.

Council of Science Editors:

Tierney C. Adaptive waveform design for SAR in a crowded spectrum. [Doctoral Dissertation]. University of Edinburgh; 2019. Available from: http://hdl.handle.net/1842/35589

University of Texas – Austin

3. -2758-9110. In-situ, high-resolution radar imaging of dynamic targets using an ultra-wideband radar.

Degree: PhD, Electrical and Computer engineering, 2016, University of Texas – Austin

URL: http://hdl.handle.net/2152/41980

► This dissertation investigates in-situ, high-resolution radar imaging of dynamic targets using an ultra-wideband (UWB) radar. Three challenging classes of dynamic targets are investigated: wind turbines,… (more)

▼ This dissertation investigates in-situ, high-resolution radar imaging of dynamic targets using an ultra-wideband (UWB) radar. Three challenging classes of dynamic targets are investigated: wind turbines, vehicles, and small consumer drones. First, the measurement and processing methodologies are developed to capture the inverse synthetic aperture radar (ISAR) image of an operating horizontal-axis wind turbine. Measurement data of a small three-blade wind turbine are collected using a UWB radar, and the measured signatures are compared to simulation results based on physical optics. The backscattering phenomenology is examined in the sinogram, spectrogram, and ISAR image domains. The same methodologies are then applied to generate the in-situ ISAR imagery of an 18-blade windmill and a 1.7 MW utility-class wind turbine. Next, the radar signatures of a vertical-axis wind turbine are studied. Measurement and simulation are carried out for a 1.5 m tall Darrieus-type turbine model. Interpretation of the dominant backscattering mechanisms is carried out. Subsequently, the radar signatures of a 112 m tall turbine are examined using simulation. Second, wide-angle ISAR imaging of vehicles is investigated. Measurement data of moving vehicles are collected using a stationary roadside UWB radar. The generated baseline ISAR images show a clear distinction between different-sized vehicles. The images are further focused through motion compensation using a p-norm minimization. The resulting images are well focused and correspond closely to the physical dimensions of the vehicles. Third, the ISAR imaging of small consumer drones is considered. Laboratory measurement is conducted first, where the drones are rotated on a turntable and the backscatterered data are collected over a wide frequency band to form high-resolution images. The effects of frequency band, aspect, polarization, dynamic blade rotation, camera mount, and drone types are examined. Subsequently, ISAR imaging of in-flight drones, from data collected using a stationary UWB radar on the ground, is demonstrated. Finally, synthetic aperture radar (SAR) imaging using a small drone as the radar platform is explored. The entire system including a UWB radar, antennas, a camera, and a single-board computer fits on the small drone and is controlled through a Wi-Fi connection. Both the side-looking and downward-looking SAR scenarios are presented. Advisors/Committee Members: Ling, Hao (advisor), Yilmaz, Ali (committee member), Hamilton, Mark (committee member), Santoso, Surya (committee member), Lin, Adrian (committee member).

Subjects/Keywords: Radar imaging; Radar measurements; Ultra-wideband radar; Inverse synthetic aperture radar; Synthetic aperture imaging

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APA (6^th Edition):

-2758-9110. (2016). In-situ, high-resolution radar imaging of dynamic targets using an ultra-wideband radar. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/41980

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Chicago Manual of Style (16^th Edition):

-2758-9110. “In-situ, high-resolution radar imaging of dynamic targets using an ultra-wideband radar.” 2016. Doctoral Dissertation, University of Texas – Austin. Accessed January 23, 2021. http://hdl.handle.net/2152/41980.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

MLA Handbook (7^th Edition):

-2758-9110. “In-situ, high-resolution radar imaging of dynamic targets using an ultra-wideband radar.” 2016. Web. 23 Jan 2021.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Vancouver:

-2758-9110. In-situ, high-resolution radar imaging of dynamic targets using an ultra-wideband radar. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2016. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/2152/41980.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Council of Science Editors:

-2758-9110. In-situ, high-resolution radar imaging of dynamic targets using an ultra-wideband radar. [Doctoral Dissertation]. University of Texas – Austin; 2016. Available from: http://hdl.handle.net/2152/41980

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

University of Michigan

4. Liu, Kuang-Hung. A Linear Algebraic Framework for Autofocus in Synthetic Aperture Radar.

Degree: PhD, Electrical Engineering: Systems, 2011, University of Michigan

URL: http://hdl.handle.net/2027.42/86443

► Synthetic aperture radar (SAR) provides a means of producing high-resolution microwave images using an antenna of small size. SAR images have wide applications in surveillance,… (more)

▼ Synthetic aperture radar (SAR) provides a means of producing high-resolution microwave images using an antenna of small size. SAR images have wide applications in surveillance, remote sensing, and mapping of the surfaces of both the Earth and other planets. The defining characteristic of SAR is its coherent processing of data collected by an antenna at locations along a trajectory in space. In principle, we can produce an image of extraordinary resolution. However, imprecise position measurements associated with data collected at each location cause phase errors that, in turn, cause the reconstructed image to suffer distortion, sometimes so severe that the image is completely unrecognizable. Autofocus algorithms apply signal processing techniques to restore the focused image. This thesis focuses on the study of the SAR autofocus problem from a linear algebraic perspective. We first propose a general autofocus algorithm, called Fourier-domain Multichannel Autofocus (FMCA), that is developed based on an image support constraint. FMCA can accommodate nearly any SAR imaging scenario, whether it be wide-angle or bistatic (transmit and receive antennas at separate locations). The performance of FMCA is shown to be superior compared to current state-of-the-art autofocus techniques. Next, we recognize that at the heart of many autofocus algorithms is an optimization problem, referred to as a constant modulus quadratic program (CMQP). Currently, CMQP generally is solved by using an eigenvalue relaxation approach. We propose an alternative relaxation approach based on semidefinite programming, which has recently attracted considerable attention in other signal processing applications. Preliminary results show that the new method provides promising performance advantages at the expense of increasing computational cost. Lastly, we propose a novel autofocus algorithm based on maximum likelihood estimation, called maximum likelihood autofocus (MLA). The main advantage of MLA is its reliance on a rigorous statistical model rather than on somewhat heuristic reverse engineering arguments. We show both the analytical and experimental advantages of MLA over existing autofocus methods. Advisors/Committee Members: Munson Jr., David C. (committee member), Hero Iii, Alfred O. (committee member), Scott, Clayton D. (committee member), Strauss, Martin J. (committee member), Wiesel, Ami (committee member).

Subjects/Keywords: Synthetic Aperture Radar; Autofocus; Electrical Engineering; Engineering

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APA (6^th Edition):

Liu, K. (2011). A Linear Algebraic Framework for Autofocus in Synthetic Aperture Radar. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/86443

Chicago Manual of Style (16^th Edition):

Liu, Kuang-Hung. “A Linear Algebraic Framework for Autofocus in Synthetic Aperture Radar.” 2011. Doctoral Dissertation, University of Michigan. Accessed January 23, 2021. http://hdl.handle.net/2027.42/86443.

MLA Handbook (7^th Edition):

Liu, Kuang-Hung. “A Linear Algebraic Framework for Autofocus in Synthetic Aperture Radar.” 2011. Web. 23 Jan 2021.

Vancouver:

Liu K. A Linear Algebraic Framework for Autofocus in Synthetic Aperture Radar. [Internet] [Doctoral dissertation]. University of Michigan; 2011. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/2027.42/86443.

Council of Science Editors:

Liu K. A Linear Algebraic Framework for Autofocus in Synthetic Aperture Radar. [Doctoral Dissertation]. University of Michigan; 2011. Available from: http://hdl.handle.net/2027.42/86443

Cornell University

5. Prush, Veronica. Anthropogenic Signals Observed Using Interferometric Synthetic Aperture Radar In The Pacific Northwest.

Degree: M.S., Geological Sciences, Geological Sciences, 2013, Cornell University

URL: http://hdl.handle.net/1813/34370

► Interferometric Synthetic Aperture Radar (InSAR) has developed over the past few decades as a tool with many applications to studies of crustal deformation. This thesis… (more)

Subjects/Keywords: Interferometric Synthetic Aperture Radar; Pacific Northwest; Anthropogenic

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APA (6^th Edition):

Prush, V. (2013). Anthropogenic Signals Observed Using Interferometric Synthetic Aperture Radar In The Pacific Northwest. (Masters Thesis). Cornell University. Retrieved from http://hdl.handle.net/1813/34370

Chicago Manual of Style (16^th Edition):

Prush, Veronica. “Anthropogenic Signals Observed Using Interferometric Synthetic Aperture Radar In The Pacific Northwest.” 2013. Masters Thesis, Cornell University. Accessed January 23, 2021. http://hdl.handle.net/1813/34370.

MLA Handbook (7^th Edition):

Prush, Veronica. “Anthropogenic Signals Observed Using Interferometric Synthetic Aperture Radar In The Pacific Northwest.” 2013. Web. 23 Jan 2021.

Vancouver:

Prush V. Anthropogenic Signals Observed Using Interferometric Synthetic Aperture Radar In The Pacific Northwest. [Internet] [Masters thesis]. Cornell University; 2013. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/1813/34370.

Council of Science Editors:

Prush V. Anthropogenic Signals Observed Using Interferometric Synthetic Aperture Radar In The Pacific Northwest. [Masters Thesis]. Cornell University; 2013. Available from: http://hdl.handle.net/1813/34370

6. Vyjayanthi, Nizalapur. Synthetic Aperture radar data analysis for vegetation classification and biomass estimation of tropical forest area.

Degree: Microwave Remote Sensing, 2010, Jawaharlal Nehru Technological University

URL: http://shodhganga.inflibnet.ac.in/handle/10603/3441

►

The present study extracts the potential of airborne and space-borne Synthetic Aperture Radar (SAR) data for 1) vegetation classification and 2) Biomass estimation over tropical… (more)

Subjects/Keywords: Microwave Remote Sensing; Biomass; Synthetic Aperture radar

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APA (6^th Edition):

Vyjayanthi, N. (2010). Synthetic Aperture radar data analysis for vegetation classification and biomass estimation of tropical forest area. (Thesis). Jawaharlal Nehru Technological University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/3441

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):

Vyjayanthi, Nizalapur. “Synthetic Aperture radar data analysis for vegetation classification and biomass estimation of tropical forest area.” 2010. Thesis, Jawaharlal Nehru Technological University. Accessed January 23, 2021. http://shodhganga.inflibnet.ac.in/handle/10603/3441.

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

MLA Handbook (7^th Edition):

Vyjayanthi, Nizalapur. “Synthetic Aperture radar data analysis for vegetation classification and biomass estimation of tropical forest area.” 2010. Web. 23 Jan 2021.

Vancouver:

Vyjayanthi N. Synthetic Aperture radar data analysis for vegetation classification and biomass estimation of tropical forest area. [Internet] [Thesis]. Jawaharlal Nehru Technological University; 2010. [cited 2021 Jan 23]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/3441.

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

Council of Science Editors:

Vyjayanthi N. Synthetic Aperture radar data analysis for vegetation classification and biomass estimation of tropical forest area. [Thesis]. Jawaharlal Nehru Technological University; 2010. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/3441

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

7. Shanthi I. Certain investigations on despeckling of SAR images;.

Degree: Certain investigations on despeckling of SAR images, 2015, Anna University

URL: http://shodhganga.inflibnet.ac.in/handle/10603/38551

►

Synthetic Aperture Radar SAR is an active remote sensing system newlinewhich is used to obtain high resolutions images SAR images are inherently newlineaffected by speckle… (more)

Subjects/Keywords: Forest fires volcanic eruptions; Synthetic Aperture Radar

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APA (6^th Edition):

I, S. (2015). Certain investigations on despeckling of SAR images;. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/38551

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):

I, Shanthi. “Certain investigations on despeckling of SAR images;.” 2015. Thesis, Anna University. Accessed January 23, 2021. http://shodhganga.inflibnet.ac.in/handle/10603/38551.

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

MLA Handbook (7^th Edition):

I, Shanthi. “Certain investigations on despeckling of SAR images;.” 2015. Web. 23 Jan 2021.

Vancouver:

I S. Certain investigations on despeckling of SAR images;. [Internet] [Thesis]. Anna University; 2015. [cited 2021 Jan 23]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/38551.

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

Council of Science Editors:

I S. Certain investigations on despeckling of SAR images;. [Thesis]. Anna University; 2015. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/38551

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

Tampere University

8. Godbole, Tanmay Ram. Evaluation of Coordinated Drone Swarm Operation as a Synthetic Aperture Antenna: A simulation-based study .

Degree: 2019, Tampere University

URL: https://trepo.tuni.fi/handle/10024/117799

► This thesis investigates the performance of Synthetic Aperture Antennas formed by static formations of UAV swarms in terms of several selected parameters. Of equal importance… (more)

Subjects/Keywords: UAV; Drone; Antenna; Synthetic Aperture Radar; Simulation

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APA (6^th Edition):

Godbole, T. R. (2019). Evaluation of Coordinated Drone Swarm Operation as a Synthetic Aperture Antenna: A simulation-based study . (Masters Thesis). Tampere University. Retrieved from https://trepo.tuni.fi/handle/10024/117799

Chicago Manual of Style (16^th Edition):

Godbole, Tanmay Ram. “Evaluation of Coordinated Drone Swarm Operation as a Synthetic Aperture Antenna: A simulation-based study .” 2019. Masters Thesis, Tampere University. Accessed January 23, 2021. https://trepo.tuni.fi/handle/10024/117799.

MLA Handbook (7^th Edition):

Godbole, Tanmay Ram. “Evaluation of Coordinated Drone Swarm Operation as a Synthetic Aperture Antenna: A simulation-based study .” 2019. Web. 23 Jan 2021.

Vancouver:

Godbole TR. Evaluation of Coordinated Drone Swarm Operation as a Synthetic Aperture Antenna: A simulation-based study . [Internet] [Masters thesis]. Tampere University; 2019. [cited 2021 Jan 23]. Available from: https://trepo.tuni.fi/handle/10024/117799.

Council of Science Editors:

Godbole TR. Evaluation of Coordinated Drone Swarm Operation as a Synthetic Aperture Antenna: A simulation-based study . [Masters Thesis]. Tampere University; 2019. Available from: https://trepo.tuni.fi/handle/10024/117799

University of Edinburgh

9. Tan, Chue Poh. Comparing synthetic aperture radar and LiDAR for above-ground biomass estimation in Glen Affric, Scotland.

Degree: PhD, 2012, University of Edinburgh

URL: http://hdl.handle.net/1842/6226

► Quantifying above-ground biomass (AGB) and carbon sequestration has been a significant focus of attention within the UNFCCC and Kyoto Protocol for improvement of national carbon… (more)

▼ Quantifying above-ground biomass (AGB) and carbon sequestration has been a significant focus of attention within the UNFCCC and Kyoto Protocol for improvement of national carbon accounting systems (IPCC, 2007; UNFCCC, 2011). A multitude of research has been carried out in relatively flat and homogeneous forests (Ranson & Sun, 1994; Beaudoin et al.,1994; Kurvonen et al., 1999; Austin et al., 2003; Dimitris et al., 2005), yet forests in the highlands, which generally form heterogeneous forest cover and sparse woodlands with mountainous terrain have been largely neglected in AGB studies (Cloude et al., 2001; 2008; Lumsdon et al., 2005; 2008; Erxue et al., 2009, Tan et al., 2010; 2011a; 2011b; 2011c; 2011d). Since mountain forests constitute approximately 28% of the total global forest area (Price and Butt, 2000), a better understanding of the slope effects is of primary importance in AGB estimation. The main objective of this research is to estimate AGB in the aforementioned forest in Glen Affric, Scotland using both SAR and LiDAR data. Two types of Synthetic Aperture Radar (SAR) data were used in this research: TerraSAR-X, operating at X-band and ALOS PALSAR, operating at L-band, both are fully polarimetric. The former data was acquired on 13 April 2010 and of the latter, two scenes were acquired on 17 April 2007 and 08 June 2009. Airborne LiDAR data were acquired on 09 June 2007. Two field measurement campaigns were carried out, one of which was done from winter 2006 to spring 2007 where physical parameters of trees in 170 circular plots were measured by the Forestry Commission team. Another intensive fieldwork was organised by myself with the help of my fellow colleagues and it comprised of tree measurement in two transects of 200m x 50m at a relatively flat and dense plantation forest and 400m x 50m at hilly and sparse semi-natural forest. AGB is estimated for both the transects to investigate the effectiveness of the proposed method at plot-level. This thesis evaluates the capability of polarimetric Synthetic Aperture Radar data for AGB estimation by investigating the relationship between the SAR backscattering coefficient and AGB and also the relationship between the decomposed scattering mechanisms and AGB. Due to the terrain and heterogeneous nature of the forests, the result from the backscatter-AGB analysis show that these forests present a challenge for simple AGB estimation. As an alternative, polarimetric techniques were applied to the problem by decomposing the backscattering information into scattering mechanisms based on the approach by Yamaguchi (2005; 2006), which are then regressed to the field measured AGB. Of the two data sets, ALOS PALSAR demonstrates a better estimation capacity for AGB estimation than TerraSAR-X. The AGB estimated results from SAR data are compared with AGB derived from LiDAR data. Since tree height is often correlated with AGB (Onge et al., 2008; Gang et al., 2010), the effectiveness of the tree height retrieval from LiDAR is evaluated as an indicator of AGB. Tree delineation…

Subjects/Keywords: 577.14; synthetic aperture radar; LiDAR; biomass

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APA (6^th Edition):

Tan, C. P. (2012). Comparing synthetic aperture radar and LiDAR for above-ground biomass estimation in Glen Affric, Scotland. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/6226

Chicago Manual of Style (16^th Edition):

Tan, Chue Poh. “Comparing synthetic aperture radar and LiDAR for above-ground biomass estimation in Glen Affric, Scotland.” 2012. Doctoral Dissertation, University of Edinburgh. Accessed January 23, 2021. http://hdl.handle.net/1842/6226.

MLA Handbook (7^th Edition):

Tan, Chue Poh. “Comparing synthetic aperture radar and LiDAR for above-ground biomass estimation in Glen Affric, Scotland.” 2012. Web. 23 Jan 2021.

Vancouver:

Tan CP. Comparing synthetic aperture radar and LiDAR for above-ground biomass estimation in Glen Affric, Scotland. [Internet] [Doctoral dissertation]. University of Edinburgh; 2012. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/1842/6226.

Council of Science Editors:

Tan CP. Comparing synthetic aperture radar and LiDAR for above-ground biomass estimation in Glen Affric, Scotland. [Doctoral Dissertation]. University of Edinburgh; 2012. Available from: http://hdl.handle.net/1842/6226

University of Waterloo

10. Lee, Peter Q. Correction Methods for Non-Stationary Noise Floor in Sentinel-1 Images Using Convex Optimization.

Degree: 2020, University of Waterloo

URL: http://hdl.handle.net/10012/16249

► Synthetic aperture radar (SAR) is a method of creating images of the surface of the Earth by emitting and receiving radar waves. Sentinel-1 is a… (more)

Subjects/Keywords: synthetic aperture radar; denoising; image processing

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APA (6^th Edition):

Lee, P. Q. (2020). Correction Methods for Non-Stationary Noise Floor in Sentinel-1 Images Using Convex Optimization. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/16249

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):

Lee, Peter Q. “Correction Methods for Non-Stationary Noise Floor in Sentinel-1 Images Using Convex Optimization.” 2020. Thesis, University of Waterloo. Accessed January 23, 2021. http://hdl.handle.net/10012/16249.

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

MLA Handbook (7^th Edition):

Lee, Peter Q. “Correction Methods for Non-Stationary Noise Floor in Sentinel-1 Images Using Convex Optimization.” 2020. Web. 23 Jan 2021.

Vancouver:

Lee PQ. Correction Methods for Non-Stationary Noise Floor in Sentinel-1 Images Using Convex Optimization. [Internet] [Thesis]. University of Waterloo; 2020. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/10012/16249.

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

Council of Science Editors:

Lee PQ. Correction Methods for Non-Stationary Noise Floor in Sentinel-1 Images Using Convex Optimization. [Thesis]. University of Waterloo; 2020. Available from: http://hdl.handle.net/10012/16249

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

University of New South Wales

11. Yu, Jung Hum. Interferometric synthetic aperture radar and radargrammetry for accurate digital elevation model generation in New South Wales, Australia.

Degree: Surveying & Spatial Information Systems, 2011, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/50805 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:9700/SOURCE02?view=true

► A topographic map is a prerequisite to the thematic map of geological and environmental information. The Digital Elevation Model (DEM) has become an important source… (more)

▼ A topographic map is a prerequisite to the thematic map of geological and environmental information. The Digital Elevation Model (DEM) has become an important source of topographical information for many scientific and engineering uses, such as hydrological and geological studies, infrastructure planning and environmental applications. Digital Elevation Models (DEMs) can be generated by using various techniques and by using a range of data sources, including ground surveying, photogrammetry, optical remote sensing, radar, and laser scanning.Where topographical data is unavailable, global coverage elevation data sets, typically DEMs based on remotely sensed data, can be the main source of information. Remote sensing techniques are a rapid means of acquiring elevation information over extensive terrain. In particular, processing remotely sensed data collected by Earth observation satellites is a very efficient and cost-effective mean of acquiring up-to-date and relatively accurate land cover and topographic information. Active remote sensing sensors (such as radar), which can operate in almost all weather conditions and also in darkness using their own illumination have become an important remote sensing technique.In radar remote sensing systems, DEM generation methods are based on the analysis of Synthetic Aperture Radar (SAR) images, and include interferometry, radargrammetry, radarclinometry, and polarimetry. The two most common methods for generating DEMs from SAR images are: (1) radargrammetry, a technique derived from photogrammetry and based on the stereoscopic principle, (2) interferometry, based on the phase differences between identical imaged points in two SAR images.This thesis describes the methods or techniques of DEM quality improvement and reduction in elevation errors, which are generated by various SAR techniques and imagery. InSAR DEM generation relies on the measurement of phase difference between two sets of complex radar signals, i.e. the range difference between the satellite-borne radar instrument and the ground targets reflecting the radar transmissions. In InSAR DEM generation, the so-called “master image” parameters, such as signal wavelength, incidence angle, and SAR image relationship (i.e. perpendicular baseline), affect the final DEM products. Furthermore, the different orbit direction (ascending and descending) provides a different representation of terrain and multi-temporal observation, leading to a more detailed representation of terrain over the same target area. Hence, ways of improving the quality of InSAR DEMs include using images collected by the satellite sensor from different orbit directions and multi-epoch data acquisitions. Also, in the case of InSAR DEM generation, major issues related to long satellite repeat-cycle times and low resolution DEM updating are discussed and solutions are proposed for ground distortion excluding method and selective elevation updating. Depending on the data acquisition conditions, the InSAR technique is less robust and more difficult… Advisors/Committee Members: Linlin, Ge, Surveying & Spatial Information Systems, Faculty of Engineering, UNSW.

Subjects/Keywords: Digital Elevation Model; Synthetic Aperture Radar; Radargrammetry

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APA (6^th Edition):

Yu, J. H. (2011). Interferometric synthetic aperture radar and radargrammetry for accurate digital elevation model generation in New South Wales, Australia. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/50805 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:9700/SOURCE02?view=true

Chicago Manual of Style (16^th Edition):

Yu, Jung Hum. “Interferometric synthetic aperture radar and radargrammetry for accurate digital elevation model generation in New South Wales, Australia.” 2011. Doctoral Dissertation, University of New South Wales. Accessed January 23, 2021. http://handle.unsw.edu.au/1959.4/50805 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:9700/SOURCE02?view=true.

MLA Handbook (7^th Edition):

Yu, Jung Hum. “Interferometric synthetic aperture radar and radargrammetry for accurate digital elevation model generation in New South Wales, Australia.” 2011. Web. 23 Jan 2021.

Vancouver:

Yu JH. Interferometric synthetic aperture radar and radargrammetry for accurate digital elevation model generation in New South Wales, Australia. [Internet] [Doctoral dissertation]. University of New South Wales; 2011. [cited 2021 Jan 23]. Available from: http://handle.unsw.edu.au/1959.4/50805 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:9700/SOURCE02?view=true.

Council of Science Editors:

Yu JH. Interferometric synthetic aperture radar and radargrammetry for accurate digital elevation model generation in New South Wales, Australia. [Doctoral Dissertation]. University of New South Wales; 2011. Available from: http://handle.unsw.edu.au/1959.4/50805 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:9700/SOURCE02?view=true

University of Adelaide

12. Goh, Alvin Soonlien. Bistatic synthetic aperture radar data processing and analysis.

Degree: 2012, University of Adelaide

URL: http://hdl.handle.net/2440/71871

► Synthetic Aperture Radar (SAR) operation in a bistatic configuration offers various advantages over its now well-established monostatic counterpart but also poses various challenges, among which… (more)

▼ Synthetic Aperture Radar (SAR) operation in a bistatic configuration offers various advantages over its now well-established monostatic counterpart but also poses various challenges, among which are the inversion of the raw bistatic SAR data into imagery, the maintenance of time and phase synchronisation between the separated transmitter and receiver, the application of interferometric techniques to bistatic data, and the polarimetric calibration of field-based bistatic systems in constant motion (particularly those with airborne/spaceborne components). As part of a research programme into the potential benefits and challenges of bistatic SAR, the Ingara fully polarimetric X-band airborne imaging radar system, developed and operated by the Australian Defence Science and Technology Organisation, was upgraded to conduct experimental SAR data collections in a bistatic geometry. Experimental trials of the new bistatic SAR system were conducted in 2007 and 2008 in which the existing airborne radar was operated in a fine-resolution (600 MHz bandwidth) circular spotlight-SAR mode, in conjunction with a newly developed fully polarimetric stationary ground-based bistatic receiver. These trials produced a set of fully polarimetric simultaneously collected monostatic and bistatic SAR data, collected over a wide range of bistatic angles, for research purposes. The work reported in this thesis is motivated by the various processing challenges presented by these data sets. Herein, image formation from raw spotlight-mode bistatic SAR data using the Polar Format Algorithm (PFA), particularly as it pertains to a circling-transmitter-stationary-receiver bistatic geometry, is discussed. The limitations of the first-order (plane-wave) phase approximation employed in deriving the PFA are examined for the case of a stationary-receiver bistatic collection geometry with co-planar transmitter, receiver and scatterers: expressions for the size of the focussed region are derived by restricting the magnitude of the second order phase term, and the complicated behaviour of the shape of this region in this bistatic case (which is not encountered in the monostatic case) is discussed. Fine-resolution imagery results from the PFA-based processing of simultaneously collected monostatic and bistatic data sets are shown, and results from the interferometric processing of single-pass simultaneously collected monostatic and bistatic SAR data with a relatively large (approx. 5°) grazing-angle difference and of repeat-pass bistatic data with a temporal delay of hours, both demonstrating interferometric coherence in the fine-resolution interferograms, are presented. Finally, the polarimetric calibration of a field-based bistatic SAR with an airborne component is addressed: minor variants of three previously published distributed-target-based polarimetric calibration algorithms are derived; the results of Monte Carlo numerical studies to compare their accuracies are discussed; a new calibration approach involving a hybrid of two of these algorithms which… Advisors/Committee Members: Gray, Douglas Andrew (advisor), Preiss, Mark (advisor), Stacy, N. J. S. (advisor), School of Electrical and Electronic Engineering (school).

Subjects/Keywords: bistatic radar; bistatic SAR; imaging radar; synthetic aperture radar

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APA (6^th Edition):

Goh, A. S. (2012). Bistatic synthetic aperture radar data processing and analysis. (Thesis). University of Adelaide. Retrieved from http://hdl.handle.net/2440/71871

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):

Goh, Alvin Soonlien. “Bistatic synthetic aperture radar data processing and analysis.” 2012. Thesis, University of Adelaide. Accessed January 23, 2021. http://hdl.handle.net/2440/71871.

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

MLA Handbook (7^th Edition):

Goh, Alvin Soonlien. “Bistatic synthetic aperture radar data processing and analysis.” 2012. Web. 23 Jan 2021.

Vancouver:

Goh AS. Bistatic synthetic aperture radar data processing and analysis. [Internet] [Thesis]. University of Adelaide; 2012. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/2440/71871.

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

Council of Science Editors:

Goh AS. Bistatic synthetic aperture radar data processing and analysis. [Thesis]. University of Adelaide; 2012. Available from: http://hdl.handle.net/2440/71871

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

Penn State University

13. Mckay, John David. Tailored Algorithms for Synthetic Aperture Image Formation and Analysis.

Degree: 2018, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/15971jvm6070

► Both sonar and radar have seen incredible advances in image quality with the increased usage of synthetic aperture array designs. This clever signal processing technique… (more)

Subjects/Keywords: Synthetic Aperture Sonar; Synthetic Aperture Radar; Deep Learning; Transfer Learning; automatic target recognition

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APA (6^th Edition):

Mckay, J. D. (2018). Tailored Algorithms for Synthetic Aperture Image Formation and Analysis. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/15971jvm6070

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):

Mckay, John David. “Tailored Algorithms for Synthetic Aperture Image Formation and Analysis.” 2018. Thesis, Penn State University. Accessed January 23, 2021. https://submit-etda.libraries.psu.edu/catalog/15971jvm6070.

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

MLA Handbook (7^th Edition):

Mckay, John David. “Tailored Algorithms for Synthetic Aperture Image Formation and Analysis.” 2018. Web. 23 Jan 2021.

Vancouver:

Mckay JD. Tailored Algorithms for Synthetic Aperture Image Formation and Analysis. [Internet] [Thesis]. Penn State University; 2018. [cited 2021 Jan 23]. Available from: https://submit-etda.libraries.psu.edu/catalog/15971jvm6070.

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

Council of Science Editors:

Mckay JD. Tailored Algorithms for Synthetic Aperture Image Formation and Analysis. [Thesis]. Penn State University; 2018. Available from: https://submit-etda.libraries.psu.edu/catalog/15971jvm6070

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

14. Neravati, Dheeraj Nehru. Enhancement of SAR Image Resolution with Implementation of Circular GB-SAR System.

Degree: 2013, , School of Engineering

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:bth-4022

► Radars were used for surveillance and remote sensing but nowadays they handle a vast range of applications, radar imagery being one of them. The… (more)

▼ Radars were used for surveillance and remote sensing but nowadays they handle a vast range of applications, radar imagery being one of them. The need for high resolution images was inevitable which lead to Synthetic Aperture Radar (SAR) systems. SAR plays a prominent role in remote sensing applications and geophysical studies. SAR is an imaging radar which inherits advantages over conventional optic sensors since they can be used irrespective of the climatic conditions and sunlight due to the merits of microwaves. In addition to these benefits SAR generates a finer resolution 2-D image which cannot be achieved with conventional real aperture radar. Ground-based SAR has a wide range of applications like monitoring of post land slide surface to estimate slope displacements, observation of Tsunami affected area for ground surface movements, etc... In the modern times, improvement in the resolution was still anticipated and this requirement for technological advancement forces the researchers to implement new strategies for the enhancement of SAR image resolution in both azimuth and range directions. In this thesis we use the circular aperture technique for resolution enhancement with practical implementation of an experimental model at the laboratory and analyzing the results with those corresponding to linear aperture. In this thesis we make use of Ultra wideband–Ultra wide beam (UWB) ground based SAR system (GB-SAR) system which achieves better resolution SAR images in both azimuth and range directions. GBP (Global Back Projection) algorithm is used to reconstruct the image from the pulse compressed back scattered echo signal. This thesis is divided into two parts: the first part concentrates on the establishment and data processing of GB-SAR where as the second part focuses on the resolution enhancement of SAR images using circular apertures. In the first part experimental GB-SAR system is introduced and the data processing with radar signal reconstruction and image processing technique is explained in detail. The SAR image formed by the experimental data is examined and compared with the assessments in theory. In the second part an experiment with circular aperture i.e. GB-CSAR system is performed to obtain the enhancement of image resolution. The SAR image formed with the experimental CSAR data is compared with the experimental LSAR image and resolution is investigated. Thus analysis on efficiency of radar resolution between Linear SAR and Circular SAR is established with practical implementation of SAR system at the laboratory. Results emphasize the significance of Circular SAR over Liner SAR.

Subjects/Keywords: Synthetic Aperture Radar; UWB; GB-SAR; Circular SAR; Circular Aperture; Resolution; Enhancement; Radar; GBP

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APA (6^th Edition):

Neravati, D. N. (2013). Enhancement of SAR Image Resolution with Implementation of Circular GB-SAR System. (Thesis). , School of Engineering. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:bth-4022

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):

Neravati, Dheeraj Nehru. “Enhancement of SAR Image Resolution with Implementation of Circular GB-SAR System.” 2013. Thesis, , School of Engineering. Accessed January 23, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-4022.

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

MLA Handbook (7^th Edition):

Neravati, Dheeraj Nehru. “Enhancement of SAR Image Resolution with Implementation of Circular GB-SAR System.” 2013. Web. 23 Jan 2021.

Vancouver:

Neravati DN. Enhancement of SAR Image Resolution with Implementation of Circular GB-SAR System. [Internet] [Thesis]. , School of Engineering; 2013. [cited 2021 Jan 23]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:bth-4022.

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

Council of Science Editors:

Neravati DN. Enhancement of SAR Image Resolution with Implementation of Circular GB-SAR System. [Thesis]. , School of Engineering; 2013. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:bth-4022

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

The Ohio State University

15. Sugavanam, Nithin. Compressive sampling in radar imaging.

Degree: PhD, Electrical and Computer Engineering, 2017, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1503277528254942

► Multi-channel wideband radar has proven to be an indispensable tool for many surveillance applications. However, achieving higher resolution with current architectures comes at the cost… (more)

▼ Multi-channel wideband radar has proven to be an indispensable tool for many surveillance applications. However, achieving higher resolution with current architectures comes at the cost of lower dynamic range for the sensor. Recent theoretical advances in the area of compressive sensing provide a new framework for sampling and processing sensor signals at a rate that scales with the information content and complexity of the scene. For the case of delay estimation - a core problem in radar sensing - compressive sensing provides a theoretical guarantee for successful recovery using Klog (N/K) compressed measurements of K scatterers over a delay space of N bins. Previous practical implementations of compressive sampling radar attempted to reduce sampling complexity at the expense of increased complexity in receivers realizing unstructured random projections. In this thesis, we study the problem of developing structured acquisition systems that exploit the underlying structure of radar signals to provide provable performance guarantees and reduced design complexity .Broadly, our work is divided into two parts. In the first part, we present a compressive radar design that employs structured waveforms on transmit and reduced complexity sub-sampling on receive with recovery guarantees of target parameters at sub-Nyquist rates. The proposed framework lends itself to practical hardware implementation as it utilizes standard linear frequency modulated waveforms mixed with sinusoidal tones and receivers with an approximated matched filter termed as stretch processor and a uniform sampling rate Analog to digital converter (ADC). Also, this structure simplifies the calibration step in practical systems because the number of random elements is minimized. We extend this illumination approach to a multiple input and output (MIMO) radar architecture and establish uniform as well as non-uniform recovery guarantees, given a sufficient number of modulating tones. We also present a method for calibrating the system for a class of uncertainty that arises in practical implementations.In the second part, we consider wide-angle synthetic aperture radar (SAR) imaging with collocated transmitter and receiver. Wide-angle SAR plays a key role in solving the target recognition problem as this scheme obtains a detailed description of the scene as a function of both viewing angle and spatial coordinates. We recover the scattering coefficients as a function of spatial locations and viewing angle from incomplete and noisy measurements. We classify an observed sub-sequence of phase-history measurements based on the nearest neighbor method using the models obtained. We empirically verify the performance of such an approach by utilizing the probability of error as a metric. We note that the performance does not deteriorate as long as we have a sufficient number of samples. We extend this method to the bistatic setup with separated transmitter and receiver to recover the scattering coefficients as a function of the spatial locations, bistatic angle, and… Advisors/Committee Members: Ertin, Emre (Advisor).

Subjects/Keywords: Electrical Engineering; Compressive sampling; MIMO radar imaging; Monostatic synthetic aperture radar imaging; Bistatic synthetic aperture radar imaging

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

APA (6^th Edition):

Sugavanam, N. (2017). Compressive sampling in radar imaging. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1503277528254942

Chicago Manual of Style (16^th Edition):

Sugavanam, Nithin. “Compressive sampling in radar imaging.” 2017. Doctoral Dissertation, The Ohio State University. Accessed January 23, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1503277528254942.

MLA Handbook (7^th Edition):

Sugavanam, Nithin. “Compressive sampling in radar imaging.” 2017. Web. 23 Jan 2021.

Vancouver:

Sugavanam N. Compressive sampling in radar imaging. [Internet] [Doctoral dissertation]. The Ohio State University; 2017. [cited 2021 Jan 23]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1503277528254942.

Council of Science Editors:

Sugavanam N. Compressive sampling in radar imaging. [Doctoral Dissertation]. The Ohio State University; 2017. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1503277528254942

University of Houston

16. Yuan, Ting. Congo Wetlands Hydrology Using SAR, InSAR, and Radar Altimetry.

Degree: PhD, Civil Engineering, 2017, University of Houston

URL: http://hdl.handle.net/10657/4617

► Extensive wetlands expand along the banks of the Congo river and its tributaries. Estimating wetlands water storages as well as its sources and sinks is… (more)

▼ Extensive wetlands expand along the banks of the Congo river and its tributaries. Estimating wetlands water storages as well as its sources and sinks is of great importance to understand water balances in the fluvial systems and the role of wetlands in nutrient and sediment transport. In this dissertation, Synthetic Aperture Radar (SAR), Interferometry SAR (InSAR), and radar altimetry are deployed to study the spatio-temporal variations of water level changes (∂h⁄∂t) and water storages, and the influxes and effluxes through the wetlands. First, a regression model integrating PALSAR backscattering coefficient ("σ" _0), Envisat altimetry, and MODIS VCF is proposed to estimate ∂h⁄∂t in the Malebo Pool where non-forested and forested vegetations exist. The accuracy of "σ" _0 method is adequate in non-forested regions where InSAR could lose coherence during high water level, whereas the accuracy degrades in dense forested wetlands where InSAR could maintain coherence to measure relative ∂h⁄∂t. Therefore, a stack of PALSAR interferograms are generated to map multi-temporal high spatial resolution ∂h⁄∂t over the forested wetlands near city Lisala. The InSAR measurements show that ∂h⁄∂t is subtle and the water flow is not well confined during low water seasons while ∂h⁄∂t shows greatest gradient perpendicular to river flow direction in high water seasons. Next, a new method is developed to reveal the inter-annual absolute water storages by integrating spatially varying ∂h⁄∂t and time series of water depth from Envisat altimetry. The mean annual amplitude over the studied 7,777 km2 wetlands from 2002 to 2011 is 3.98±0.59 km3, with maximum water volume to be 6.3±0.68 km3 in the wet year of 2002 and minimum volume to be 2.2±0.61 km3 in the dry year of 2005. Finally, mass balance analysis results suggest that local water (i.e. upland runoff and rainfall) contributes more than 85% of total inflow while regional water (i.e. wetland river exchanges) supplies less than 15% of total inflow. Wetland river exchanges contribute 59% to 80% to the total outflow while evapotranspiration contributes 20% to 41% of the total outflow. A wetland model was applied to derive two site specific hydrological parameters, flow conductance (K_f) and depth exponent (β). Advisors/Committee Members: Lee, Hyongki (advisor), Shrestha, Ramesh L. (committee member), Glennie, Craig L. (committee member), Beighley, R. Edward (committee member), Jung, Hahn Chul (committee member).

Subjects/Keywords: Congo wetlands; Synthetic aperture radar (SAR); Radar altimetry

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

APA (6^th Edition):

Yuan, T. (2017). Congo Wetlands Hydrology Using SAR, InSAR, and Radar Altimetry. (Doctoral Dissertation). University of Houston. Retrieved from http://hdl.handle.net/10657/4617

Chicago Manual of Style (16^th Edition):

Yuan, Ting. “Congo Wetlands Hydrology Using SAR, InSAR, and Radar Altimetry.” 2017. Doctoral Dissertation, University of Houston. Accessed January 23, 2021. http://hdl.handle.net/10657/4617.

MLA Handbook (7^th Edition):

Yuan, Ting. “Congo Wetlands Hydrology Using SAR, InSAR, and Radar Altimetry.” 2017. Web. 23 Jan 2021.

Vancouver:

Yuan T. Congo Wetlands Hydrology Using SAR, InSAR, and Radar Altimetry. [Internet] [Doctoral dissertation]. University of Houston; 2017. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/10657/4617.

Council of Science Editors:

Yuan T. Congo Wetlands Hydrology Using SAR, InSAR, and Radar Altimetry. [Doctoral Dissertation]. University of Houston; 2017. Available from: http://hdl.handle.net/10657/4617

Delft University of Technology

17. De Wit, J.J.M. Development of an Airborne Ka-band FMCW Synthetic Aperture Radar.

Degree: 2005, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:e847e657-9bf6-47f0-9dd2-8530452a306f ; urn:NBN:nl:ui:24-uuid:e847e657-9bf6-47f0-9dd2-8530452a306f ; urn:NBN:nl:ui:24-uuid:e847e657-9bf6-47f0-9dd2-8530452a306f ; http://resolver.tudelft.nl/uuid:e847e657-9bf6-47f0-9dd2-8530452a306f

► In the field of airborne earth observation there is a special interest in lightweight, low cost imaging radars of high resolution. Such radar systems could… (more)

Subjects/Keywords: FMCW radar; synthetic aperture radar

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APA (6^th Edition):

De Wit, J. J. M. (2005). Development of an Airborne Ka-band FMCW Synthetic Aperture Radar. (Doctoral Dissertation). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:e847e657-9bf6-47f0-9dd2-8530452a306f ; urn:NBN:nl:ui:24-uuid:e847e657-9bf6-47f0-9dd2-8530452a306f ; urn:NBN:nl:ui:24-uuid:e847e657-9bf6-47f0-9dd2-8530452a306f ; http://resolver.tudelft.nl/uuid:e847e657-9bf6-47f0-9dd2-8530452a306f

Chicago Manual of Style (16^th Edition):

De Wit, J J M. “Development of an Airborne Ka-band FMCW Synthetic Aperture Radar.” 2005. Doctoral Dissertation, Delft University of Technology. Accessed January 23, 2021. http://resolver.tudelft.nl/uuid:e847e657-9bf6-47f0-9dd2-8530452a306f ; urn:NBN:nl:ui:24-uuid:e847e657-9bf6-47f0-9dd2-8530452a306f ; urn:NBN:nl:ui:24-uuid:e847e657-9bf6-47f0-9dd2-8530452a306f ; http://resolver.tudelft.nl/uuid:e847e657-9bf6-47f0-9dd2-8530452a306f.

MLA Handbook (7^th Edition):

De Wit, J J M. “Development of an Airborne Ka-band FMCW Synthetic Aperture Radar.” 2005. Web. 23 Jan 2021.

Vancouver:

De Wit JJM. Development of an Airborne Ka-band FMCW Synthetic Aperture Radar. [Internet] [Doctoral dissertation]. Delft University of Technology; 2005. [cited 2021 Jan 23]. Available from: http://resolver.tudelft.nl/uuid:e847e657-9bf6-47f0-9dd2-8530452a306f ; urn:NBN:nl:ui:24-uuid:e847e657-9bf6-47f0-9dd2-8530452a306f ; urn:NBN:nl:ui:24-uuid:e847e657-9bf6-47f0-9dd2-8530452a306f ; http://resolver.tudelft.nl/uuid:e847e657-9bf6-47f0-9dd2-8530452a306f.

Council of Science Editors:

De Wit JJM. Development of an Airborne Ka-band FMCW Synthetic Aperture Radar. [Doctoral Dissertation]. Delft University of Technology; 2005. Available from: http://resolver.tudelft.nl/uuid:e847e657-9bf6-47f0-9dd2-8530452a306f ; urn:NBN:nl:ui:24-uuid:e847e657-9bf6-47f0-9dd2-8530452a306f ; urn:NBN:nl:ui:24-uuid:e847e657-9bf6-47f0-9dd2-8530452a306f ; http://resolver.tudelft.nl/uuid:e847e657-9bf6-47f0-9dd2-8530452a306f

University of British Columbia

18. Vachon, Paris W. Synthetic-aperture radar imaging of the ocean surface : theoretical considerations, and experiments with simulated and actual SAR imagery.

Degree: PhD, Oceanography, 1987, University of British Columbia

URL: http://hdl.handle.net/2429/27556

► Three key areas of controversy in synthetic-aperture radar (SAR) imaging of ocean surface waves are considered: first, the nature of Bragg scattering; second, the role,… (more)

▼ Three key areas of controversy in synthetic-aperture radar (SAR) imaging of ocean surface waves are considered: first, the nature of Bragg scattering; second, the role, magnitude, and calculation of the scene coherence time; and third, the relevant ocean wave velocities for coherent Doppler modulations. This work begins with a re-derivation and extension of existing SAR imaging theory for point and diffuse targets. Generic, relatively simple, closed-form expressions for the impulse response, the resolution, and the image bandwidth summarize this unified treatment. Theoretical differences between the imagery of point and diffuse targets are pointed out. Based upon these fundamental differences, a statistical testing procedure is formulated to address the question of scene target density. Background ocean surface wave theory is outlined in preparation for discussions of SAR ocean imaging. Of central importance is the role of the phase velocity, which is the speed of translation of the mean pattern of reflectivity, and the orbital motion, which leads to coherent (phase) modulation, and hence to velocity bunching, acceleration defocus, and target decorrelation. Based upon this theoretical background, one- and two-dimensional simulation models are developed. The one-dimensional simulation addresses the effects of various parameters upon the mean image contrast in a velocity bunching model and guides the development of the two-dimensional simulation. The two-dimensional simulation is unique because each target which constitutes the scene is explicitly considered. This leads to a degree of control and flexibility which is not available from actual SAR imagery. Qualitative and quantitative comparisons are drawn between the simulated and actual SAR imagery to address the key areas of controversy. The assertion that Bragg scattering is a coherent process is defended, despite inability to conclusively verify this using SEASAT data. Comparisons between simulation and C-SAR imagery of waves propagating into ice verify the roles of the scene coherence time and the wave phase velocity.

Subjects/Keywords: Radar meteorology; Synthetic aperture radar

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APA (6^th Edition):

Vachon, P. W. (1987). Synthetic-aperture radar imaging of the ocean surface : theoretical considerations, and experiments with simulated and actual SAR imagery. (Doctoral Dissertation). University of British Columbia. Retrieved from http://hdl.handle.net/2429/27556

Chicago Manual of Style (16^th Edition):

Vachon, Paris W. “Synthetic-aperture radar imaging of the ocean surface : theoretical considerations, and experiments with simulated and actual SAR imagery.” 1987. Doctoral Dissertation, University of British Columbia. Accessed January 23, 2021. http://hdl.handle.net/2429/27556.

MLA Handbook (7^th Edition):

Vachon, Paris W. “Synthetic-aperture radar imaging of the ocean surface : theoretical considerations, and experiments with simulated and actual SAR imagery.” 1987. Web. 23 Jan 2021.

Vancouver:

Vachon PW. Synthetic-aperture radar imaging of the ocean surface : theoretical considerations, and experiments with simulated and actual SAR imagery. [Internet] [Doctoral dissertation]. University of British Columbia; 1987. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/2429/27556.

Council of Science Editors:

Vachon PW. Synthetic-aperture radar imaging of the ocean surface : theoretical considerations, and experiments with simulated and actual SAR imagery. [Doctoral Dissertation]. University of British Columbia; 1987. Available from: http://hdl.handle.net/2429/27556

University of British Columbia

19. Kavanagh, Patricia F. Doppler centroid ambiguity estimation for synthetic aperture radar.

Degree: Master of Applied Science - MASc, Electrical and Computer Engineering, 1985, University of British Columbia

URL: http://hdl.handle.net/2429/25075

► For a synthetic aperture radar (SAR) system, the Doppler centroid is the azimuth Doppler frequency received from a point scatterer centered in the azimuth antenna… (more)

▼ For a synthetic aperture radar (SAR) system, the Doppler centroid is the azimuth Doppler frequency received from a point scatterer centered in the azimuth antenna pattern. This parameter is required by the SAR processor in order to properly focus SAR images. Since the azimuth Doppler spectrum is weighted by the azimuth antenna pattern, the Doppler centroid can be determined by locating the peak of the Doppler spectrum. This measurement, however, is ambiguous because the azimuth Doppler spectrum is aliased by the radar pulse repetition frequency (PRF). To resolve the ambiguity, the antenna beam angle, which determines the Doppler centroid, is measured; the accuracy of this measurement must be high enough to determine the Doppler centroid to within ±PRF/2. For some SAR systems, such as the future Radarsat system, the beam angle measurement must be very accurate; this can be technically infeasible or too costly to implement. This thesis examines an alternative approach to resolving the Doppler centroid ambiguity which does not require accurate beam angle measurement In most SAR processors, several partial azimuth aperture "looks" are processed, rather than a single long aperture, in order to yield a final SAR image with reduced speckle noise. If the Doppler centroid is in error by an integer number of PRFs, then the SAR looks will be defocussed and misregistered in range. The degree of misregistration depends on with which Doppler centroid ambiguity the data is processed. The new method for Doppler centroid ambiguity estimation measures the range displacement of SAR looks using a cross-correlation of looks in the range direction. The theoretical background and details of the new method are discussed. The effects of differing terrain types, wave motion, and errors in the azimuth frequency modulation (FM) rate are addressed. The feasibility of the approach is demonstrated by testing the cross-correlation algorithm on available Seasat data processed with simulated Doppler centroid ambiguity errors. The Seasat analysis is extrapolated to the Radarsat system with favourable results.

Subjects/Keywords: Doppler radar; Synthetic aperture radar

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APA (6^th Edition):

Kavanagh, P. F. (1985). Doppler centroid ambiguity estimation for synthetic aperture radar. (Masters Thesis). University of British Columbia. Retrieved from http://hdl.handle.net/2429/25075

Chicago Manual of Style (16^th Edition):

Kavanagh, Patricia F. “Doppler centroid ambiguity estimation for synthetic aperture radar.” 1985. Masters Thesis, University of British Columbia. Accessed January 23, 2021. http://hdl.handle.net/2429/25075.

MLA Handbook (7^th Edition):

Kavanagh, Patricia F. “Doppler centroid ambiguity estimation for synthetic aperture radar.” 1985. Web. 23 Jan 2021.

Vancouver:

Kavanagh PF. Doppler centroid ambiguity estimation for synthetic aperture radar. [Internet] [Masters thesis]. University of British Columbia; 1985. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/2429/25075.

Council of Science Editors:

Kavanagh PF. Doppler centroid ambiguity estimation for synthetic aperture radar. [Masters Thesis]. University of British Columbia; 1985. Available from: http://hdl.handle.net/2429/25075

University of Oklahoma

20. Dower, William. Advances in Synthetic Aperture Radar from a Wavenumber Perspective.

Degree: PhD, 2017, University of Oklahoma

URL: http://hdl.handle.net/11244/52722

► This dissertation examines the wavenumber domain of Synthetic Aperture Radar (SAR) images. This domain is the inverse Fourier transform domain of a SAR image. The… (more)

Subjects/Keywords: synthetic aperture radar; image resolution; back projection; bistatic radar

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APA (6^th Edition):

Dower, W. (2017). Advances in Synthetic Aperture Radar from a Wavenumber Perspective. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/52722

Chicago Manual of Style (16^th Edition):

Dower, William. “Advances in Synthetic Aperture Radar from a Wavenumber Perspective.” 2017. Doctoral Dissertation, University of Oklahoma. Accessed January 23, 2021. http://hdl.handle.net/11244/52722.

MLA Handbook (7^th Edition):

Dower, William. “Advances in Synthetic Aperture Radar from a Wavenumber Perspective.” 2017. Web. 23 Jan 2021.

Vancouver:

Dower W. Advances in Synthetic Aperture Radar from a Wavenumber Perspective. [Internet] [Doctoral dissertation]. University of Oklahoma; 2017. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/11244/52722.

Council of Science Editors:

Dower W. Advances in Synthetic Aperture Radar from a Wavenumber Perspective. [Doctoral Dissertation]. University of Oklahoma; 2017. Available from: http://hdl.handle.net/11244/52722

21. Oloumi, Daniel. Oil Well Monitoring by Ultra-wideband Ground Penetrating Synthetic Aperture Radar.

Degree: 2012, , School of Engineering

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:bth-3797

►

Radar has been used for remote sensing and surveillance for decades. Nowadays radar remote sensing and radar surveillance is used for many different things… (more)

▼

Radar has been used for remote sensing and surveillance for decades. Nowadays radar remote sensing and radar surveillance is used for many different things in the modern society. Radar can sense objects or environments from very long distance. Electromagnetic radar waves can work where and when light cannot. This unique ability of radar made remote sensing techniques available in research and in industrial applications. Radar can operate in any climate and any time of the day. Using ultra-wideband (UWB) pulses for radar in combination with synthesizing apertures, which is so called synthetic aperture radar (SAR), enables radar to produce high resolution images in both range and azimuth directions. The work presented in this thesis uses SAR for oil well monitoring. SAR is seen as a good candidate to follow oil well changes in time by means of maintenance. Other methods to perform this task have been introduced and implemented but they are not able to produce high resolution images from the oil well. Using SAR for oil well monitoring provides high resolution images of oil well walls in order to detect the asphaltene or bitumen. The resolutions of images can be enhanced by using UWB signal and SAR processing. Asphaltene and bitumen are the heavy components of crude oil and capable of blocking the porous media in oil well. The porous media is called damaged material when its holes are blocked by asphaltene or bitumen as it cannot pass the oil any more. A decrease in oil production is the consequence of this phenomenon. If these materials can be detected at very beginning stages of formation, addition of solvent at the location of the detected materials can be very helpful for oil well maintenance. This thesis is divided in to two parts. The first part focuses on SAR processing whereas the second one aims at antenna design and fabrication to work in a ground penetrating synthetic aperture radar (GPSAR) system. In the first part, an oil well model based on the measured electrical properties of common oil well materials is introduced. SAR processing is then applied to the oil well model to reconstruct SAR image of the oil well. The resulting SAR image is shown to provide high resolutions so that different materials can be distinguished. In the second part, a modified TEM horn antenna for SAR is designed, simulated and fabricated. The antenna is customized to work in oil media. A new profile model for the TEM horn antenna is proposed that modifies the antenna radiation pattern in the design. The antenna measurements are shown to be in agreement with the simulated results.

Oil well monitoring is very important for the oil and gas industry. Therefore in this thesis, a new ultra-wideband (UWB) ground penetrating radar (GPR) system for detection of near wellbore formation damage is introduced. The proposed GPR uses ground penetrating synthetic aperture radar (GPSAR) and a new developed transverse electromagnetic (TEM) horn antenna to increase GPR image resolution. The work has therefore been divided in two parts of…

Subjects/Keywords: Ground penetrating radar; Synthetic aperture radar; Ultra-wide-band radar; Ultra-wide-band horn antenna

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APA (6^th Edition):

Oloumi, D. (2012). Oil Well Monitoring by Ultra-wideband Ground Penetrating Synthetic Aperture Radar. (Thesis). , School of Engineering. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:bth-3797

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):

Oloumi, Daniel. “Oil Well Monitoring by Ultra-wideband Ground Penetrating Synthetic Aperture Radar.” 2012. Thesis, , School of Engineering. Accessed January 23, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-3797.

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

MLA Handbook (7^th Edition):

Oloumi, Daniel. “Oil Well Monitoring by Ultra-wideband Ground Penetrating Synthetic Aperture Radar.” 2012. Web. 23 Jan 2021.

Vancouver:

Oloumi D. Oil Well Monitoring by Ultra-wideband Ground Penetrating Synthetic Aperture Radar. [Internet] [Thesis]. , School of Engineering; 2012. [cited 2021 Jan 23]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:bth-3797.

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

Council of Science Editors:

Oloumi D. Oil Well Monitoring by Ultra-wideband Ground Penetrating Synthetic Aperture Radar. [Thesis]. , School of Engineering; 2012. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:bth-3797

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

University of Houston

22. -2880-8565. Advanced SAR Interferometry Methods for Ground Displacement Estimation from Spaceborne and Airborne Platforms.

Degree: PhD, Geosensing Systems, 2016, University of Houston

URL: http://hdl.handle.net/10657/3277

► Interferometric synthetic aperture radar (InSAR) is a powerful technique to monitor ground deformation phenomena, such as landslides, ground subsidence, seismological activities, and volcano dynamics. In… (more)

▼ Interferometric synthetic aperture radar (InSAR) is a powerful technique to monitor ground deformation phenomena, such as landslides, ground subsidence, seismological activities, and volcano dynamics. In this dissertation, two major problems of the current advanced InSAR techniques are described and corresponding approaches are proposed to solve them. Among various multitemporal InSAR techniques, persistent (or permanent) scatterer InSAR (PSInSAR) has been widely used in a variety of cases due to its high accuracy and resistance to temporal and spatial decorrelations. One major drawback of the PSInSAR technique is the low spatial density of PSs, especially over non-urban areas without man-made structures. A Phase-Decomposition-based PSInSAR (PD-PSInSAR) method is developed in this dissertation to improve the coherence and spatial density of measurement points by processing the distributed scatterer (DS) dominated by two or more scattering mechanisms. PD-PSInSAR performs eigendecomposition on the coherence matrix in order to estimate the phases corresponding to the different scattering mechanisms, and then implements these estimated phases in conventional PSInSAR process. An important procedure in DS interferometry is the phase triangulation (PT). In this study, the mathematical framework for PT algorithms is proposed. This dissertation introduces two modified PT algorithms and analyzes the mathematical relations between five different PT methods. The analysis shows that these five PT methods share very similar mathematical forms with different weight values. The proposed mathematical framework supports improved understanding and advanced estimation methods for the use of PT algorithms in DS interferometry. Another major drawback of traditional InSAR is that only the deformation along the line-of-sight (LOS) direction can be detected. In order to estimate the deformation in the along-track direction, a time-domain along-track SAR interferometry (TAI) technique is proposed. Compared with existing multiple-aperture SAR interferometry (MAI) methods, the proposed technique utilizes the full aperture to generate single-look complex images, and results in higher SNR and along-track resolution. In the last part of the dissertation, a case study of Slumgullion landslide is performed to demonstrate the potentials and challenges of airborne InSAR as well as the possible solutions to improve the precision of the derived deformation measurements. Advisors/Committee Members: Lee, Hyongki (advisor), Shrestha, Ramesh L. (committee member), Glennie, Craig L. (committee member), Lu, Zhong (committee member), Jung, Hahn Chul (committee member).

Subjects/Keywords: InSAR; Synthetic aperture radar (SAR); Deformation mesurement; Differential interferometric synthetic aperture; Radar (DInSAR); Persistent; Scattering; Interferometry

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APA (6^th Edition):

-2880-8565. (2016). Advanced SAR Interferometry Methods for Ground Displacement Estimation from Spaceborne and Airborne Platforms. (Doctoral Dissertation). University of Houston. Retrieved from http://hdl.handle.net/10657/3277

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Chicago Manual of Style (16^th Edition):

-2880-8565. “Advanced SAR Interferometry Methods for Ground Displacement Estimation from Spaceborne and Airborne Platforms.” 2016. Doctoral Dissertation, University of Houston. Accessed January 23, 2021. http://hdl.handle.net/10657/3277.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

MLA Handbook (7^th Edition):

-2880-8565. “Advanced SAR Interferometry Methods for Ground Displacement Estimation from Spaceborne and Airborne Platforms.” 2016. Web. 23 Jan 2021.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Vancouver:

-2880-8565. Advanced SAR Interferometry Methods for Ground Displacement Estimation from Spaceborne and Airborne Platforms. [Internet] [Doctoral dissertation]. University of Houston; 2016. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/10657/3277.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Council of Science Editors:

-2880-8565. Advanced SAR Interferometry Methods for Ground Displacement Estimation from Spaceborne and Airborne Platforms. [Doctoral Dissertation]. University of Houston; 2016. Available from: http://hdl.handle.net/10657/3277

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Oregon State University

23. Ohm, David R. Enhanced inverse synthetic aperture radar imagery using 2-D spectral estimation.

Degree: MS, Electrical and Computer Engineering, 2004, Oregon State University

URL: http://hdl.handle.net/1957/11727

► This research focused on the use of classical and modern two-dimensional spectral estimation techniques for enhancing inverse synthetic aperture radar (ISAR) imagery. 2-D Classical spectral… (more)

Subjects/Keywords: Synthetic aperture radar – Image quality

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APA (6^th Edition):

Ohm, D. R. (2004). Enhanced inverse synthetic aperture radar imagery using 2-D spectral estimation. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/11727

Chicago Manual of Style (16^th Edition):

Ohm, David R. “Enhanced inverse synthetic aperture radar imagery using 2-D spectral estimation.” 2004. Masters Thesis, Oregon State University. Accessed January 23, 2021. http://hdl.handle.net/1957/11727.

MLA Handbook (7^th Edition):

Ohm, David R. “Enhanced inverse synthetic aperture radar imagery using 2-D spectral estimation.” 2004. Web. 23 Jan 2021.

Vancouver:

Ohm DR. Enhanced inverse synthetic aperture radar imagery using 2-D spectral estimation. [Internet] [Masters thesis]. Oregon State University; 2004. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/1957/11727.

Council of Science Editors:

Ohm DR. Enhanced inverse synthetic aperture radar imagery using 2-D spectral estimation. [Masters Thesis]. Oregon State University; 2004. Available from: http://hdl.handle.net/1957/11727

Ryerson University

24. Nayebi, Nazanin. Synthetic Aperture Imaging : Applications In High-Frequency Ultrasound.

Degree: 2008, Ryerson University

URL: https://digital.library.ryerson.ca/islandora/object/RULA%3A1582

► Synthetic Aperture (SA) is an imaging method that uses the motion of a single-element transducer to synthesize the effect of a larger array transducer. In… (more)

Subjects/Keywords: Synthetic aperture radar; Imaging systems

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APA (6^th Edition):

Nayebi, N. (2008). Synthetic Aperture Imaging : Applications In High-Frequency Ultrasound. (Thesis). Ryerson University. Retrieved from https://digital.library.ryerson.ca/islandora/object/RULA%3A1582

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):

Nayebi, Nazanin. “Synthetic Aperture Imaging : Applications In High-Frequency Ultrasound.” 2008. Thesis, Ryerson University. Accessed January 23, 2021. https://digital.library.ryerson.ca/islandora/object/RULA%3A1582.

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

MLA Handbook (7^th Edition):

Nayebi, Nazanin. “Synthetic Aperture Imaging : Applications In High-Frequency Ultrasound.” 2008. Web. 23 Jan 2021.

Vancouver:

Nayebi N. Synthetic Aperture Imaging : Applications In High-Frequency Ultrasound. [Internet] [Thesis]. Ryerson University; 2008. [cited 2021 Jan 23]. Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A1582.

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

Council of Science Editors:

Nayebi N. Synthetic Aperture Imaging : Applications In High-Frequency Ultrasound. [Thesis]. Ryerson University; 2008. Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A1582

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

Mississippi State University

25. Marapareddy, Ramakalavathi. Levee slide detection using synthetic aperture radar magnitude and phase.

Degree: PhD, Electrical and Computer Engineering, 2015, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10232015-154700/ ;

► The objectives of this research are to support the development of state-of-the-art methods using remotely sensed data to detect slides or anomalies in an… (more)

▼ The objectives of this research are to support the development of state-of-the-art methods using remotely sensed data to detect slides or anomalies in an efficient and cost-effective manner based on the use of SAR technology. Slough or slump slides are slope failures along a levee, which leave areas of the levee vulnerable to seepage and failure during high water events. This work investigates the facility of detecting the slough slides on an earthen levee with different types of polarimetric Synthetic Aperture Radar (polSAR) imagery. The source SAR imagery is fully quad-polarimetric L-band data from the NASA Jet Propulsion Laboratorys (JPLs) Uninhabited Aerial Vehicle Synthetic Aperture Radar (UAVSAR). The study area encompasses a portion of the levees of the lower Mississippi river, located in Mississippi, United States. The obtained classification results reveal that the polSAR data unsupervised classification with features extraction produces more appropriate results than the unsupervised classification with no features extraction. Obviously, supervised classification methods provide better classification results compared to the unsupervised methods. The anomaly identification is good with these results and was improved with the use of a majority filter. The classification accuracy is further improved with a morphology filter. The classification accuracy is significantly improved with the use of GLCM features. The classification results obtained for all three cases (magnitude, phase, and complex data), with classification accuracies for the complex data being higher, indicate that the use of synthetic aperture radar in combination with remote sensing imagery can effectively detect anomalies or slides on an earthen levee. For all the three samples it consistently shows that the accuracies for the complex data are higher when compared to those from the magnitude and phase data alone. The tests comparing complex data features to magnitude and phase data alone, and full complex data, and use of post-processing filter, all had very high accuracy. Hence we included more test samples to validate and distinguish results. Advisors/Committee Members: Nicolas H. Younan (chair), James V. Aanstoos (committee member), Jenny Q. Du (committee member), Hyeona Lim (committee member), Jonathan R. Woody (committee member).

Subjects/Keywords: Polarimetry; Classification; UAVSAR; Earthen Levees; Synthetic Aperture Radar

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APA (6^th Edition):

Marapareddy, R. (2015). Levee slide detection using synthetic aperture radar magnitude and phase. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-10232015-154700/ ;

Chicago Manual of Style (16^th Edition):

Marapareddy, Ramakalavathi. “Levee slide detection using synthetic aperture radar magnitude and phase.” 2015. Doctoral Dissertation, Mississippi State University. Accessed January 23, 2021. http://sun.library.msstate.edu/ETD-db/theses/available/etd-10232015-154700/ ;.

MLA Handbook (7^th Edition):

Marapareddy, Ramakalavathi. “Levee slide detection using synthetic aperture radar magnitude and phase.” 2015. Web. 23 Jan 2021.

Vancouver:

Marapareddy R. Levee slide detection using synthetic aperture radar magnitude and phase. [Internet] [Doctoral dissertation]. Mississippi State University; 2015. [cited 2021 Jan 23]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10232015-154700/ ;.

Council of Science Editors:

Marapareddy R. Levee slide detection using synthetic aperture radar magnitude and phase. [Doctoral Dissertation]. Mississippi State University; 2015. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10232015-154700/ ;

University of Alaska – Fairbanks

26. Ajadi, Olaniyi A. Unsupervised multi-scale change detection from SAR imagery for monitoring natural and anthropogenic disasters .

Degree: 2017, University of Alaska – Fairbanks

URL: http://hdl.handle.net/11122/7859

► Radar remote sensing can play a critical role in operational monitoring of natural and anthropogenic disasters. Despite its all-weather capabilities, and its high performance in… (more)

▼ Radar remote sensing can play a critical role in operational monitoring of natural and anthropogenic disasters. Despite its all-weather capabilities, and its high performance in mapping, and monitoring of change, the application of radar remote sensing in operational monitoring activities has been limited. This has largely been due to: (1) the historically high costs associated with obtaining radar data; (2) slow data processing, and delivery procedures; and (3) the limited temporal sampling that was provided by spaceborne radar-based satellites. Recent advances in the capabilities of spaceborne Synthetic Aperture Radar (SAR) sensors have developed an environment that now allows for SAR to make significant contributions to disaster monitoring. New SAR processing strategies that can take full advantage of these new sensor capabilities are currently being developed. Hence, with this PhD dissertation, I aim to: (i) investigate unsupervised change detection techniques that can reliably extract signatures from time series of SAR images, and provide the necessary flexibility for application to a variety of natural, and anthropogenic hazard situations; (ii) investigate effective methods to reduce the effects of speckle and other noise on change detection performance; (iii) automate change detection algorithms using probabilistic Bayesian inferencing; and (iv) ensure that the developed technology is applicable to current, and future SAR sensors to maximize temporal sampling of a hazardous event. This is achieved by developing new algorithms that rely on image amplitude information only, the sole image parameter that is available for every single SAR acquisition. The motivation and implementation of the change detection concept are described in detail in Chapter 3. In the same chapter, I demonstrated the technique's performance using synthetic data as well as a real-data application to map wildfire progression. I applied Radiometric Terrain Correction (RTC) to the data to increase the sampling frequency, while the developed multiscaledriven approach reliably identified changes embedded in largely stationary background scenes. With this technique, I was able to identify the extent of burn scars with high accuracy. I further applied the application of the change detection technology to oil spill mapping. The analysis highlights that the approach described in Chapter 3 can be applied to this drastically different change detection problem with only little modification. While the core of the change detection technique remained unchanged, I made modifications to the pre-processing step to enable change detection from scenes of continuously varying background. I introduced the Lipschitz regularity (LR) transformation as a technique to normalize the typically dynamic ocean surface, facilitating high performance oil spill detection independent of environmental conditions during image acquisition. For instance, I showed that LR processing reduces the sensitivity of change detection performance to variations in surface winds, which is a… Advisors/Committee Members: Webley, Peter (committee).

Subjects/Keywords: Synthetic aperture radar; Alaska; Disasters; Remote sensing; Monitoring; Oil spills; Aufeis

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APA (6^th Edition):

Ajadi, O. A. (2017). Unsupervised multi-scale change detection from SAR imagery for monitoring natural and anthropogenic disasters . (Thesis). University of Alaska – Fairbanks. Retrieved from http://hdl.handle.net/11122/7859

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):

Ajadi, Olaniyi A. “Unsupervised multi-scale change detection from SAR imagery for monitoring natural and anthropogenic disasters .” 2017. Thesis, University of Alaska – Fairbanks. Accessed January 23, 2021. http://hdl.handle.net/11122/7859.

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

MLA Handbook (7^th Edition):

Ajadi, Olaniyi A. “Unsupervised multi-scale change detection from SAR imagery for monitoring natural and anthropogenic disasters .” 2017. Web. 23 Jan 2021.

Vancouver:

Ajadi OA. Unsupervised multi-scale change detection from SAR imagery for monitoring natural and anthropogenic disasters . [Internet] [Thesis]. University of Alaska – Fairbanks; 2017. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/11122/7859.

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

Council of Science Editors:

Ajadi OA. Unsupervised multi-scale change detection from SAR imagery for monitoring natural and anthropogenic disasters . [Thesis]. University of Alaska – Fairbanks; 2017. Available from: http://hdl.handle.net/11122/7859

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

Duke University

27. Boyarsky, Michael. Metasurface Antennas for Synthetic Aperture Radar .

Degree: 2019, Duke University

URL: http://hdl.handle.net/10161/20124

► Synthetic aperture radar offers unparalleled satellite imaging capabilities for planetary observation. Future systems will realize high resolution with near-real-time revisit rates by using coordinated… (more)

Subjects/Keywords: Electrical engineering; Antennas; Metamaterials; Metasurface antennas; Microwave imaging; Synthetic aperture radar

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APA (6^th Edition):

Boyarsky, M. (2019). Metasurface Antennas for Synthetic Aperture Radar . (Thesis). Duke University. Retrieved from http://hdl.handle.net/10161/20124

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):

Boyarsky, Michael. “Metasurface Antennas for Synthetic Aperture Radar .” 2019. Thesis, Duke University. Accessed January 23, 2021. http://hdl.handle.net/10161/20124.

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

MLA Handbook (7^th Edition):

Boyarsky, Michael. “Metasurface Antennas for Synthetic Aperture Radar .” 2019. Web. 23 Jan 2021.

Vancouver:

Boyarsky M. Metasurface Antennas for Synthetic Aperture Radar . [Internet] [Thesis]. Duke University; 2019. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/10161/20124.

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

Council of Science Editors:

Boyarsky M. Metasurface Antennas for Synthetic Aperture Radar . [Thesis]. Duke University; 2019. Available from: http://hdl.handle.net/10161/20124

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

Stellenbosch University

28. Bessinger, Mariel. Flood mapping in the Zambezi Region using Synthetic Aperture Radar.

Degree: MSc, Geography and Environmental Studies, 2016, Stellenbosch University

URL: http://hdl.handle.net/10019.1/98658

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ENGLISH ABSTRACT: Floods occur annually in the Zambezi Region during the rainy seasons, causing economic losses and social disruption. Projected changes in climate and land… (more)

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ENGLISH ABSTRACT: Floods occur annually in the Zambezi Region during the rainy seasons, causing economic losses and social disruption. Projected changes in climate and land use could worsen the effects of floods. SAR sensors are active sensors and operate in the microwave region and are therefore not restricted by time of day or inclement weather, making them well-suited for flood monitoring. The aim of this research is to examine the use of ASAR and PALSAR images (with acquisition dates ranging from 17 March 2009 to 30 May 2009) to determine flood extent by classifying open water bodies in the Zambezi Region using two different approaches: binary thresholding and active contour models (ACMs) using the Canny edge detector as initial contour. Classified images were then statistically and visually compared to Landsat images. For ASAR images, overall accuracies ranged between 70% and 99% for the threshold classification method and 58% and 98% for ACMs. For PALSAR images, overall accuracy ranged between 54% and 91% for the threshold classification method and between 60% and 96% for ACMs. Results obtained were adequate for both methods of classification, with thresholds only slightly outperforming ACMs for ASAR images, and ACMs only slightly outperforming thresholds for PALSAR images. These methods are binary classifications, which was acceptable for delineating open water bodies, but flooded vegetation areas were present and methods need to be extended to include these areas. Sensor properties such as wavelength, incidence angle and polarisation have an effect on the effectiveness of identifying flooded water bodies. Longer wavelengths are better suited for open water detection than shorter wavelengths, because of better penetration capabilities than shorter wavelengths. Shallower incidence angles are better suited for open water detection, but steeper incidence angles are better suited for flooded vegetation. HH-polarised imagery performed the best for open water body detection when open water surfaces were smooth, but cross-polarisations performed best when surface roughness was present. Therefore, HH- and HV- polarisations should provide sufficient discriminatory power required for open water and flooded vegetation regions.

AFRIKAANSE OPSOMMING: Daar is jaarlikse vloede in die Zambezi Streek gedurende die reënseisoen wat ekonomiese verliese en ontwrigting in die gemeenskap tot gevolg het. Geprojekteerde veranderinge in klimaat en grondgebruik kan die gevolge van vloede vererger. SAR sensors is aktiewe sensors in die mikrogolf spektrum en word dus nie deur die tyd van die dag of gure weer beïnvloed nie, wat dit baie geskik maak om vloede te kontroleer. Die doelwit van hierdie navorsing is om die gebruik van ASAR en PALSAR beelde, wat tussen 17 Maart 2009 tot 30 Mei 2009 opgeneem is, te ondersoek ten einde die omvang van die vloed vas te stel deur die oopwaterliggame in die Zambezi Streek deur twee benaderings te volg: binêre drumpelwaardes en aktiewe kontoer modelle (AKMs) met die Canny rand detektor as aanvanklike…

Advisors/Committee Members: Kemp, Jaco, Luck-Vogel, Melanie, Stellenbosch University. Faculty of Arts and Social Sciences. Dept. of Geography and Environmental Studies..

Subjects/Keywords: UCTD; Floods – Namibia – Zambezi – Remote sensing; Synthetic aperture radar

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

APA (6^th Edition):

Bessinger, M. (2016). Flood mapping in the Zambezi Region using Synthetic Aperture Radar. (Masters Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/98658

Chicago Manual of Style (16^th Edition):

Bessinger, Mariel. “Flood mapping in the Zambezi Region using Synthetic Aperture Radar.” 2016. Masters Thesis, Stellenbosch University. Accessed January 23, 2021. http://hdl.handle.net/10019.1/98658.

MLA Handbook (7^th Edition):

Bessinger, Mariel. “Flood mapping in the Zambezi Region using Synthetic Aperture Radar.” 2016. Web. 23 Jan 2021.

Vancouver:

Bessinger M. Flood mapping in the Zambezi Region using Synthetic Aperture Radar. [Internet] [Masters thesis]. Stellenbosch University; 2016. [cited 2021 Jan 23]. Available from: http://hdl.handle.net/10019.1/98658.

Council of Science Editors:

Bessinger M. Flood mapping in the Zambezi Region using Synthetic Aperture Radar. [Masters Thesis]. Stellenbosch University; 2016. Available from: http://hdl.handle.net/10019.1/98658

Brigham Young University

29. Duersch, Michael Israel. Backprojection for Synthetic Aperture Radar.

Degree: PhD, 2013, Brigham Young University

URL: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=5059&context=etd

► Synthetic aperture radar (SAR) is a type of radar capable of high-resolution coherent imaging. In order to produce coherent imagery from raw SAR data, an… (more)

▼ Synthetic aperture radar (SAR) is a type of radar capable of high-resolution coherent imaging. In order to produce coherent imagery from raw SAR data, an image formation algorithm is employed. The various image formation algorithms have strengths and weaknesses. As this work shows, time-domain backprojection is one algorithm whose strengths are particularly well-suited to use at low-altitudes. This work presents novel research in three areas regarding time-domain backprojection. The first key contribution of this work is a detailed analysis of SAR time-domain backprojection. The work derives a general form of backprojection from first principles. It characterizes the sensitivities of backprojection to the various inputs as well as error sources and performance characteristics. This work then shows what situations are particularly well-suited to use of the backprojection algorithm, namely regimes with turbulent motion and wide variation in incidence angle across the range swath (e.g., low-altitude, airborne SAR).The second contribution of this work is an analysis of geometric signal correlation for multi-static, sometimes termed multiple-input and multiple-output (MIMO), imaging. Multi-static imaging involves forming multiple images using different combinations of transmitters and receivers. Geometric correlation is a measure of how alike observations of a target are from different aspect angles. This work provides a novel model for geometric correlation which may be used to determine the degree to which multi-static images are correlated. This in turn determines their applicable use: operating in the highly correlated regime is desirable for coherent processing whereas operating in a lower-correlation regime is desirable for obtaining independent looks. The final contribution of this work is a novel algorithm for interferometry based on backprojected data. Because of the way backprojected images are formed, they are less suited to traditional interferometric methods. This work derives backprojection interferometry and compares it to the traditional method of interferometry. The sensitivity and performance of backprojection interferometry are shown, as well as where backprojection interferometry offers superior results. This work finds that backprojection interferometry performs better with longer interferometric baseline lengths or systems with large measurement error in the baseline length or angle (e.g., low-altitude, airborne SAR).

Subjects/Keywords: synthetic aperture radar; backprojection; interferometry; geometric correlation; Electrical and Computer Engineering

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

APA (6^th Edition):

Duersch, M. I. (2013). Backprojection for Synthetic Aperture Radar. (Doctoral Dissertation). Brigham Young University. Retrieved from https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=5059&context=etd

Chicago Manual of Style (16^th Edition):

Duersch, Michael Israel. “Backprojection for Synthetic Aperture Radar.” 2013. Doctoral Dissertation, Brigham Young University. Accessed January 23, 2021. https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=5059&context=etd.

MLA Handbook (7^th Edition):

Duersch, Michael Israel. “Backprojection for Synthetic Aperture Radar.” 2013. Web. 23 Jan 2021.

Vancouver:

Duersch MI. Backprojection for Synthetic Aperture Radar. [Internet] [Doctoral dissertation]. Brigham Young University; 2013. [cited 2021 Jan 23]. Available from: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=5059&context=etd.

Council of Science Editors:

Duersch MI. Backprojection for Synthetic Aperture Radar. [Doctoral Dissertation]. Brigham Young University; 2013. Available from: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=5059&context=etd

University of Guelph

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

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

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

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

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

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

APA (6^th Edition):

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

Chicago Manual of Style (16^th Edition):

McKeown, Steven. “Discrimination of Agricultural Land Management Practices using Polarimetric Synthetic Aperture RADAR.” 2012. Masters Thesis, University of Guelph. Accessed January 23, 2021. https://atrium.lib.uoguelph.ca/xmlui/handle/10214/3901.

MLA Handbook (7^th Edition):

McKeown, Steven. “Discrimination of Agricultural Land Management Practices using Polarimetric Synthetic Aperture RADAR.” 2012. Web. 23 Jan 2021.

Vancouver:

McKeown S. Discrimination of Agricultural Land Management Practices using Polarimetric Synthetic Aperture RADAR. [Internet] [Masters thesis]. University of Guelph; 2012. [cited 2021 Jan 23]. Available from: https://atrium.lib.uoguelph.ca/xmlui/handle/10214/3901.

Council of Science Editors:

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

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