SAR实时成像中交叠FFT的有效实现

Efficient Implementation of Fold FFT in Real-Time SAR Imaging

ＳＡＲ实时成像处理中常采用子孔径交叠来提取算法的并行性，但为抑制栅栏旁瓣效应，需要对输入数据进行交叠处理，极大地增加了处理数据量。本文对交叠ＦＦＴ的一种有效实现－Ｆｏｌｄ ＦＦＴ给出了详尽分析与理解，指出这种方法是通过采用更长的滤波器阶数，来获得所要求的滤波器性能，达到减少交叠的目的。本文同时对实现时的相关问题进行了讨论。仿真结果证明了其正确性。

Subaperture processing is always used to parallize the SAR real-time imaging, but input data must be overlapped to avoid grating lobes, which greatly increase the data rate. A effective realization for segment FFT is analyzed exhaustively in this paper, and some questions related are also discussed. Eventually, the simulation result prove this realization is correct.