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 640 for “"SAR"”.
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A comprehensive literature review of SAR polarimetric calibration for Waseda SAR Sensor
… deals with a comprehensive literature review on SAR polarimetric calibration, as well as developing a polarimetric calibration procedure to be used for calibrating the sensor for the Waseda SAR project. The complete work is presented in six chapters. The dissertation starts by introducing …
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SAR processing using PVM
… Machine) to improve the speed of processing a SAR (Synthetic Aperture Radar) image. A network of heterogeneous machines were set up as the basis of the parallel virtual machine. SAR processing software was written for testing the PVM. The software performed simplified range and azimuth …
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Building detection in SAR imagery
… building detection in Synthetic Aperture Radar (SAR) imagery can be computationally expensive and/or enforce stringent requirements for data acquisition. I present two techniques that are effective and efficient at determining an approximate building location. This approximate location can be …
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Speckle reduction in SAR imagery
Synthetic Aperture Radar (SAR) is a popular tool for airborne and space-borne remote sensing. Inherent to SAR imagery is a type of multiplicative noise known as speckle. There are a number of different approaches which may be taken in order to reduce the amount of speckle noise in SAR imagery. One …
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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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Modeling SAR signals and sensors using VHDL
The purpose of radar signal processing is to extract desired data from radar signals. Testing of the radar signal processor requires that one produce a test consisting of a sequence of digitized radar sensor data. If the signal processor is modeled in VHDL then the sequence of sensor data will be …
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Implementation of Range Autofocus for SAR Radar Imaging
… The results given were generated using a SAR working outside linear ranges.</p>
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Low-power SAR ADC for biomedical portable devices
… and no more. Successive-Approximation-Register (SAR) Analog to Digital Converters (ADCs) stand out as the preferred choice for such applications due to their remarkable energy efficiency and nearly digital architecture. The SAR architecture’s scalability allows for energy consumption optimisation …
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Polarimetric SAR for the monitoring of agricultural crops
… capabilities of the Synthetic Aperture Radar (SAR) to provide fine spatial resolution and a wide area coverage, both in day and night time and almost under all weather conditions, make it a key tool for agricultural applications, including the monitoring and the estimation of phenological …
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A 1.7GS/s SAR ADC in 28nm CMOS
This thesis presents a 1.7GS/s 9b single channel SAR ADC in 28nm CMOS technology. The main focus of the thesis is the leveraging of the pipelining, passive residue transfer, and partial interleaving techniques to increase sample rate of the ADC. The first chapter explains the motivation for …
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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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Multiscale segmentation and anomaly enhancement of SAR imagery
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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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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Soil parameter retrieval under vegetation cover using SAR polarimetry
… thesis by means of (multi-angular) polarimetric SAR acquisitions at a longer wavelength (L-band, lambda=23cm). In this thesis, the penetration capabilities of L-band are combined with newly developed (multi-angular) polarimetric decomposition techniques to separate the different scattering …
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Design Techniques for High-Performance SAR A/D Converters
… for use in successive approximation register (SAR) ADCs. ADCs are crucial building blocks in communication systems, in general, and for mobile networks, in particular. The recently launched fifth generation of mobile networks (5G) has required new ADC circuit techniques to meet the higher speed …
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Time-Offset Fractional-N PLLs for Heterodyne FMCW SAR
… continuous-wave (FMCW) synthetic aperture radar (SAR) and the impact of spurii on such a system. Heterodyne receiver architectures avoid phenomena which limit the sensitivity of their homodyne counterparts, and enable certain inter-antenna feed-through suppression techniques. Despite these …
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