分布式小卫星SAR回波仿真快速算法

回波信号仿真是研究分布式小卫星SAR系统的基础,对于系统总体设计具有重要意义。大范围自然场景回波仿真导致巨大的计算量。快速算法基于FFT实现,首先在时域利用脉冲序列近似表征场景在慢时刻的响应,然后利用FFT在频域实现线性时不变滤波以产生场景回波,算法能够有效减小运算量。对仿真的回波进行成像和干涉处理,结果验证了算法的有效性。

A Rapid Algorithm for Distributed Small Satellite SAR Raw Signal Simulation

Raw signal simulation is considered the base for the study of distributed small satellite SAR system.Huge computation is needed when raw signal of wide area natural scenes is simulated.A rapid algorithm using FFT is proposed to reduce computation.Firstly,time domain response of the natural scene is approximately expressed by pulse sequence.Then in frequence domain,LTI filter is realized with FFT to generate raw signal.The results of SAR imaging and interferometric processing of simulated raw signal validate the algorithm.