高分辨星载SAR改进Chirp Scaling成像算法

Refined Chirp Scaling Algorithm for High Resolution Spaceborne SAR Imaging

本文提出了一种用于星载合成孔径雷达 (SAR)的改进ChirpScaling成像处理算法 .本文分析了三种星载SAR距离模型 ,根据误差最小的斜视等效距离模型 ,推导了改进ChirpScaling算法 ,给出了实现步骤 .该算法适用于大距离徙动高分辨率星载SAR精确成像 .并且基于改进的ChirpScaling算法 ,分析了多普勒参数误差对成像质量的影响 .最后通过计算机仿真 。

In this paper a refined chirp scaling algorithm for spaceborne synthetic aperture radar (SAR) imaging is presented.At first,three range models of spaceborne SAR are analyzed.Based on the squint range model which has the least error among the three models,a refined chirp scaling algorithm is derived.And it is suitable for precise imaging of high resolution spaceborne SAR with large range cell migration.Based on the refined chirp scaling algorithm,the effects of Doppler parameters on the quality of SAR image are analyzed as well.Finally,this algorithm is tested by computer simulation.