Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 20 for “"SAR imaging"”.
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Optimized techniques for real-time microwave and millimeter wave SAR imaging
… and millimeter wave synthetic aperture radar (SAR)-based imaging techniques, used for nondestructive evaluation (NDE), have shown tremendous usefulness for the inspection of a wide variety of complex composite materials and structures. Studies were performed for the optimization of uniform and …
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Orthogonally coded array for high-speed synthetic aperture radar (SAR) imaging
Synthetic aperture radar (SAR) imaging, for nondestructive testing (NDT) purposes, has been applied to a wide range of applications. Within the SAR family, many different imaging systems have been designed and developed to optimize the tradeoffs between image quality, resolution, image production …
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Topics in CT and SAR Imaging: Fast Back -Projection Algorithms and Optimal Antenna Spacings
… of the phase unwrapping problem in 3-D SAR imaging. In this thesis, we study the optimal antenna spacings for pointwise terrain height estimation. In particular, we start from the maximum likelihood estimates of the terrain height. The ambiguous terrain height derived from any pair of …
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Influence of antenna pattern on synthetic aperture radar (SAR) imaging and complex permittivity extraction from images of multilayered media
… and millimeter wave synthetic aperture radar (SAR) imaging technique has been widely used for nondestructive evaluation (NDE) applications. To evaluate the performance of a SAR imaging system, factors including image production time, image quality, and capability to get quantitative information …
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Synthetic Aperture Radar Image Formation for the Moving -Target and Near -Field Bistatic Cases
Bistatic SAR imaging is more involved than the monostatic SAR case, because of the separation of the transmitter and the receiver, and possibly the changing bistatic geometry. For near-field bistatic SAR imaging, we develop a novel fast BP algorithm, motivated by a newly proposed fast BP algorithm …
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Non-invasive microwave and millimeter wave reflectometry and imaging for human skin diagnosis and materials characterization
… wave reflectometry and synthetic aperture radar (SAR) imaging techniques have been successfully applied in many applications, such as nondestructive testing and evaluation (NDT&E), security inspection and medical diagnosis. In this dissertation, the feasibility of using microwave and millimeter …
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Monostatic Airborne Synthetic Aperture Radar Using Commercial WiMAX Transceivers In the License-exempt Spectrum
… an evolution of synthetic aperture radar (SAR). Boosted by digital signal processing (DSP), a variety of SAR imaging algorithms have been developed, in which the wavenumber domain algorithm is mature for airborne SAR and independent of signal waveforms. Apart from the algorithm development, …
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A Consideration of Signal Processing for Spotlight Synthetic Aperture Radar (Ambiguity Functions)
… of spotlight mode synthetic aperture radar (SAR) imaging was carried out using a model based solely on the recognizable similarity it shares with tomographic reconstruction. Doppler effects were relegated to a pre-processing step. Results of this investigation included a determination of the …
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An estimation-theoretic technique for motion-compensated synthetic-aperture array imaging
Synthetic-Aperture Radar (SAR) is an imaging technique that achieves high azimuth resolution by using coherent processing to exploit the relative motion between an airborne or spaceborne radar antenna and the imaged target field (effectively synthesizing the effect of a larger aperture array). From …
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Target Detection Using a Wavelet-Based Fractal Scheme
… is evaluated on Synthetic Aperture Rader (SAR) imaging and compared with a previously developed fractal-based technique, namely the extended fractal (EF) model. Both techniques attempt to exploit the textural characteristics of SAR imagery. Recently, a wavelet-based fractal feature set, …
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Array-based GPR SAR simulation and image reconstruction
… directions. This project aims at developing a SAR imaging technique, which uses a single transmitting/receiving antenna to synthesize a two-dimensional planar aperture. Thus a three-dimensional reflectivity image of a scene is generated. The resolution in the across track and along track …
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Exploring scatterer anisotrophy in synthetic aperture radar via sub-aperture analysis
Scattering from man-made objects in SAR imagery exhibits aspect and frequency dependencies which are not always well modeled by standard SAR imaging techniques based on the ideal point scattering model. This is particularly the case for highresolution wide-band and wide-aperture data where model …
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Synthetic aperture radar-based techniques and reconfigurable antenna design for microwave imaging of layered structures
… the past several decades, a number of microwave imaging techniques have been developed for detecting embedded objects (targets) in a homogeneous media. New applications such as nondestructive testing of layered composite structures, through-wall and medical imaging require more advanced imaging …
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Automatic matching of features in Synthetic Aperture Radar data to digital map data.
The large amounts of Synthetic Aperture Radar (SAR) data now being generated demand automatic tools for image interpretation. Where available, map data provides a valuable aid for visual interpretation and it should aid automatic interpretation. Automatic map based interpretation will be heavily …
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Hardware architectures for compact microwave and millimeter wave cameras
"Millimeter wave SAR imaging has shown promise as an inspection tool for human skin for characterizing burns and skin cancers. However, the current state-of-the-art in microwave camera technology is not yet suited for developing a millimeter wave camera for human skin inspection. Consequently, the …
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Analysis of interferometric SAR for topographic mapping
… using interferometry synthetic aperture radar (InSAR). The procedure uses the difference of phase measurements of the received radar signals at two antennas separated slightly in the cross-track direction, to determine the elevations more accurately than stereo SAR mapping, which uses SAR …
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Advancements in Satellite SAR Methods for Monitoring Civil Infrastructure
Synthetic Aperture Radar (SAR) imaging enables large-scale, remote monitoring of civil infrastructure. SAR allows for monitoring without installation or maintenance, unlike traditional contact-type sensors. Whilst SAR interferometry (InSAR) is widely used for land monitoring, its application to …
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Synthetic aperture sonar imaging using compressive sensing and an ultrasound transducer array
… is tomography such as magnetic resonance imaging (MRI), X-ray CT, and in 3D synthetic aperture radar (SAR) imaging for reconstructing the elevation reflectivity profile. This dissertation describes the investigation into three-dimensional (3D) synthetic aperture sonar (SAS) imaging in air …
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Categorization of electromagnetic radiation scatterers by means of synthetic aperture radar (SAR) images
… of solar illumination, allowing day and night imaging. Nowadays radar systems are capable of providing very high resolution images of the Earth’s surface by means of Synthetic Aperture Radar (SAR) systems. SAR imaging is ideal to monitor dynamic processes on the Earth’s surface in a reliable, …