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Research on Displaced Phase Centers Multi-band HRWS SAR Technology

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Tutor: DongZhen
School: National University of Defense Science and Technology
Course: Information and Communication Engineering
Keywords: Synthetic Aperture Radar,High-resolution swath,Phase centers multiple azimuth be
CLC: V443.2
Type: Master's thesis
Year:  2010
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Abstract:
High-resolution wide-swath (HRWS) modern earth observation mission of spaceborne Synthetic Aperture Radar (SAR) imaging capability of the increasingly high requirements the traditional SAR modes such as striped (Stripmap), scanning ( ScanSAR) and spotlight (Spotlight ) are not at the same time meet the requirements of high resolution and wide swath . Phase centers multiple azimuth beam (DPCMAB) mode for the situation overcharged mode , it is possible to resolve the contradiction between high resolution and wide swath requirements in order to achieve continuous score big swath imaging . SAR range resolution depends on the signal bandwidth , there are great difficulties in the ultra-high bandwidth (such as X-band the 2GHz bandwidth ) signal generation , reception and spaceborne SAR systems . Step FM signal bandwidth synthesis technology through a multi- sub - band signal data fusion distance to the ultra-high resolution , significantly reduces the difficulty of the system to achieve ultra-high range resolution . The combination of the phase centers multiple azimuth beam and sub- signals are transmitted simultaneously with Step FM signal transceiver system , the formation of multiple overcharged ( MIMO) SAR 2D ultra-high resolution , wide-swath spaceborne SAR systems can be achieved , this article conduct research on issues related to this new system of SAR . Chapter DPCMAB principles and methods of modeling , simulation and analysis of critical errors , self - correction method based on the array of special significant point error estimation methods and joint iterative analysis and comparison . The third chapter analyzes DPCMAB system parameters on the performance of signal reconstruction , the flexible adaptive beamforming capability based on active phased array radar array configuration to optimize system performance . Chapter sub-band principle of concurrent system and the signal processing methods , analysis of non - completely orthogonal impact of imaging the sub-band signal , the use of positive and negative FM stepping frequency signal for the virtual image of the peak of the virtual image level suppression is proposed based on the special significant point of error compensation method . The fifth chapter based DPCMAB with sub-band the concurrent technology MIMO HRWS SAR system based on this system to carry out the echo simulation , data fusion , and imaging processing , validation of this new system of two-dimensional high-resolution imaging capabilities of the SAR .
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