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A Easy Implementation Real Time Autofocus Algorithm for High Resolution Airborne SAR |
Zhang Xin①②; Wu Yi-rong①; Ding Chi-biao① |
①The National Key Laboratory of Microwave Imaging Technology of the Institute of Electronics,
Chinese Academy of Sciences, Beijing 100080, China;
②Graduate School of the Chinese Academy of Sciences, Beijing 100039, China |
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Abstract The effect of the range migration to the Shift-And-Correlate Monopulse Secondary Surbeillause Redar (SAC) algorithm is analyzed in this paper. The conclusion is that the precision of SAC would be severely affected by the range migration in the high resolution SAR. Integrated with the range Doppler algorithm, a new SAC autofocus algorithm based on the limits of range bin is presented, which called Shift-And-Correlate within Gate Strategy (SACGS). The effect of the range migration is minished by SACGS. And the precision is increased. The efficiency of SACGS is proved by the simulation and actual SAR data. It can satisfy the request of the high resolution. And the computation is very simple, which make it very suitable for real-time image processing.
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Received: 10 October 2004
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