一種易行的高分辨率機載SAR實時自聚焦算法
A Easy Implementation Real Time Autofocus Algorithm for High Resolution Airborne SAR
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摘要: 該文詳細分析了距離徙動對頻移相關自聚焦算法的影響，得出了高分辨率時距離徙動將嚴重影響頻移相關法估計精度的結論。并結合距離多普勒算法提出了一種基于距離門限制的頻移相關自聚焦算法，該算法減小了距離徙動對自聚焦的影響，提高了估計精度，仿真和實際數據均驗證了該算法的有效性，可以達到高分辨率的要求，并且具有計算簡單的優(yōu)點，適合實時成像。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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Wahl D E, Eichel P H. Phase gradient autofocusA robust tool for high resolution SAR phase correction[J].IEEE Trans.on Aerospace and Electronic Systems.1994, 30(3):827-[2]Carrrara Walter G, Goodman Ron S. Spotlight Synthetic Aperture Radar Signal Processing Algorithms, London: Artech House, 1995: 246.252[3]Jorgen Dall. A new frequency domain autofocus algorithm for SAR.[J].Proceeding of IGARSS 91, Helsinki, June.1991,:-[4]Green J E, Oliver C J. The limits on autofocus in SAR. Int. J. Remote Sensing, 1992, 13: 26232641. .[5]Oliver Chris, Quegan Shaun, Understanding Synthetic Aperture Radar Images, London: Artech House, 1998: 5253. -
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