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Remote Sensing Technology and Application  2005, Vol. 20 Issue (4): 430-434    DOI: 10.11873/j.issn.1004-0323.2005.4.430
Analysis and Comparison of Several Algorithms on Improving Azimuth Resolution for Distributed SAR
HAN Zhao-hui1,2, LEI Li-qing2
(1.Graduate School for Chinese Academy of Sciences,Beijing100080,China;
2.Center for Space Science and Applied Research,Chinese Academy of Sciences,Beijing100080,China)
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We analyzed three existing methods for improving azimuth resolution for distributed SAR system in this paper: to extend equivalent Doppler spectrum in time domain, which improves resolution while leads to spectrum overlapping and worsen results; to improve spectrum utilization and realize full-aperture imaging, which results in considerable computational complexity; to carry out spatial filtering by means of statistics and estimation, which enlarges imaging area while maintains theoretical resolution and results in amazing computational complexity for pseudo-inverse of matrix. In view of the shortcomings of these methods, we proposed a spatial frequency filtering approach to improve the synthesized spectrum to overcome them. We presented computer simulations to validate the proposed method.

Key words:  Distributed SAR      Spectrum synthesizing      Zzimuth resolution     
Received:  25 October 2004      Published:  27 October 2011
TP 75  
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HAN Zhao-hui, LEI Li-qing. Analysis and Comparison of Several Algorithms on Improving Azimuth Resolution for Distributed SAR. Remote Sensing Technology and Application, 2005, 20(4): 430-434.

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