应用CZT成像算法处理非线性调频SAR信号  

Application of Chirp Z-Transform in Imaging Processing of Non-Linear Frequency Modulated SAR Signals

作　　者：宋红军[1] 鞠佩恒[1] 孔德亮[1] 

机构地区：[1]中国科学院电子学研究所,北京100080

出　　处：《测试技术学报》2005年第1期65-69,共5页Journal of Test and Measurement Technology

摘　　要：　在雷达领域,非线性调频(NLFM)信号正越来越广泛地被应用.对于综合孔径雷达(SAR),利用NLFM脉冲压缩既可改善脉压系统性能,又可提高系统的安全性和抗干扰性,但是如何应用现有的成像算法处理NLFMSAR信号仍少有研究.本文提出了一种改进的ChirpZ-Transform(CZT)算法,该算法适用于处理NLFMSAR信号.作者从NLFM函数族中选取了一组NLFM信号进行处理,不失普遍性地证明了应用改进的CZT算法处理NLFM信号和线性调频(LFM)信号,可以得到相同的距离单元迁移(RCM)校正效果.In the radar field, Non-Linear Frequency Modulation (NLFM) signals are widely used. For Synthetic Aperture Radar (SAR), use NLFM pulse compress can improve the pulse compress and anti-jamming capability of SAR system. But how to take the existing SAR imaging arithmetic to process NLFM signal still rarely be studied. This paper expounds a kind of improved Chirp Z-Transform (CZT) arithmetic which permits to process SAR echo when SAR sends NLFM signals. a group of parameters form NLFM functions family is chosen and the improved CZT arithmetic to process the signal. Is used, the result is as good as Linear Frequency Modulated SAR signals.

关 键 词：非线性调频 算法处理 SAR CZT 成像 LFM信号 综合孔径雷达 Chirp 系统性能 脉冲压缩 抗干扰性 应用改进 校正效果 距离单元 安全性 行处理 函数族 普遍性 脉压 

分 类 号：TN957.51[电子电信—信号与信息处理] TP273[电子电信—信息与通信工程]