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基于RWC的斜视机载SAR CS算法仿真
刘明园,徐松涛,刘凯,何建军
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(空军工程大学工程学院,西安 710038;解放军69018部队，新疆喀什 844200)

摘要:

通过建立机载合成孔径雷达（Synthetic Aperture Radar，SAR)工作模型，介绍了SA R成像的原理，详细分析了斜视条件下距离徙动产生的原因以及对成像的影响，针对调频变标算法（Chirp Scaling，CS）算法的实现过程及特点，指出其在斜视角情况下成像存在的缺陷，提出使用改进的算法即在傅里叶变换之前进行距离徙动校正（Range Walk Correction,RW C）的处理，重点推导了改进后的算法实现过程，并通过Matlab仿真实现了CS算法正侧视及斜视时成像，证明改进后的算法在侧斜视情况下成像质量有较大的改善。

关键词: 机载合成孔径雷达斜视角成像调频变标算法距离徙动校正

DOI：

基金项目:

Simulation of CS Algorithm for Squint Looking Airborne SAR Based on RWC

LIU Ming-yuan,XU Song-tao,LIU Kai,HE Jian-jun

(The Engineering Institute, Air Force Engineering University, Xi′an 710038,China;Unit 69018 of PLA, Kashi 844200, China)

Abstract:

Based on the squintlooking mode, the theory of airborne SAR(Synthetic Aperture Radar) imaging is described.The reason and the effect of range migrati on on imaging in squinted looking mode is analysed.According to the realization process and characters of CS(Chirp Scaling) algorithm,its limitations when used in this mode are pointed out.An improved algorithm is proposed that the range wa lk correction(RWC) is performed before FFT(Fast Fourier Transform). The process of the improved algorithm is emphasized. The imaging with CS algorithm in side looking and squintlooking modes is realized through Matlab simulation.The resu lt proves that the imaging quality is greatly improved with the algorithm in si delooking and squintlooking modes.

Key words: airborne SAR squint imaging chirp scaling(CS) algorithm range walk correction (RWC)