结合Chirp Z变换的聚束SAR极坐标格式成像算法

Polar Format Algorithm for Spotlight SAR Imaging Based on Chirp Z Transform

提出了一种新颖的基于Chirp Z变换(CZT)的极坐标格式成像算法。首先分析了极坐标格式下聚束SAR的回波信号模型,阐述了CZT的基本原理,然后详细推导了利用CZT实现极坐标格式成像的理论依据,给出了成像算法流程及各步骤的具体参数取值,在成像处理中完全避免了插值运算,减少了极坐标格式成像算法的复杂度,最后通过点目标仿真给出了成像结果,验证了算法的可行性和有效性。

A novel imaging algorithm based on Chirp Z transform（CZT） is presented in this paper. With analysis of the echo＇s properties on polar grid and the principles of the CZT, the imaging algorithm based on CZT is derived in detail. The algorithm flow and parameters during the process are also developed. This approach eliminates interpolation and reduces computational complexity. It has been validated by point target simulation.