一种易行的高分辨率机载SAR实时自聚焦算法
A Easy Implementation Real Time Autofocus Algorithm for High Resolution Airborne SAR
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摘要: 该文详细分析了距离徙动对频移相关自聚焦算法的影响，得出了高分辨率时距离徙动将严重影响频移相关法估计精度的结论。并结合距离多普勒算法提出了一种基于距离门限制的频移相关自聚焦算法，该算法减小了距离徙动对自聚焦的影响，提高了估计精度，仿真和实际数据均验证了该算法的有效性，可以达到高分辨率的要求，并且具有计算简单的优点，适合实时成像。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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