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| Research on Mending of Space-borne Sliding Spotlight SAR Imaging Model Error |
| Han Bing①② Zhang Yong-jun② Hu Dong-hui① Huang Li-jia① |
| ①(Key Laboratory of Technology in Geo-spatial Information Processing and Application System, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China) ②(Beijing Institute of Remote Sensing Information, Beijing 100192, China) |
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Abstract Sliding spotlight SAR, which is between strip-map SAR and spotlight SAR, is a unique imaging mode. Concerning on the long illuminating time and long accumulating time of high-resolution and wide-coverage-area space-borne sliding spotlight SAR, the precision and the azimuth-time-variant characteristic of the traditional imaging model are analyzed in this paper. Based on the theory of motion compensation for airborne SAR, a method to correct the azimuth-time-variant error, which makes use of range error caused by non-linear movement of space-borne SAR relative to the virtual rotating point, is presented. In addition, a method to compensate the remnant cubic error of the imaging model in Doppler domain is also given here. Finally, a new DCS algorithm with imaging model error mending is introduced, whose validity is verified with computer simulation.
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Received: 19 November 2010
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Corresponding Authors:
Han Bing
E-mail: hanbing2007928@sohu.com
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2011, Vol. 33 
