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On Synthetic Aperture Radar High Resolution Imaging And A New Method For Moving Targets Imaging

Posted on:2004-09-02Degree:MasterType:Thesis
Country:ChinaCandidate:H LiuFull Text:PDF
GTID:2168360092495212Subject:Signal and Information Processing
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Synthetic Aperture Radar high resolution imaging, moving targets detection and imaging are key issues in the research field of Synthetic Aperture Radar. The dissertation focuses on three aspects, that is, Synthetic Aperture Radar imaging algorithms, Synthetic Aperture Radar high resolution imaging, moving targets detection and imaging.Firstly, the fundamentals of Synthetic Aperture Radar have been briefly introduced and the radar return signal of point target has been constructed. Two common-used Synthetic Aperture Radar imaging algorithms, Range-Doppler algorithm and Chirp-Scaling algorithm, have been analyzed and tested using compute simulation and real Synthetic Aperture Radar data.One key issue of the Synthetic Aperture Radar high resolution imaging is how to obtain SAR image of high geometrical resolution. The phase error reduction using motion compensation and autofocus algorithms are the essential steps in Synthetic Aperture Radar high resolution imaging. The dissertation analysis the three autofocus algorithms, namely, Map Drift autofocus algorithm. Phase Gradient Autofocus algorithm and Contrast Optimization autofocus algorithm. Meanwhile, the computer simulation and the real Synthetic Aperture Radar data are used to test these algorithms.The other key issue of the Synthetic Aperture Radar high resolution imaging is how to obtain SAR image of high radiometric resolution. The dissertation discusses some related issues on SAR radiometric resolution, the fundamentals of speckle noise and the suppression of speckle noise using multilook processing. The real Synthetic Aperture Radar data experiment demonstrates the effectiveness of multilook processing.Moving targets detection and imaging is also an important research trend of Synthetic Aperture Radar. Based on the analysis of previous research work, a novelmoving targets detection and imaging method using fractional Fourier has been proposed in this dissertation. Its technical background has been analyzed carefully and its feasibility and effectiveness are supported by the computer simulation and the real Synthetic Aperture Radar data experiment. In addition, it is easy to be implemented in the SAR system, which enhances its potential for practical application.
Keywords/Search Tags:Synthetic Aperture Radar, SAR imaging algorithm, Autofocus algorithm, multilook processing, moving targets detection, moving targets imaging, Wigner-Ville distribution, fractional Fourier transform
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