分布式星载SAR-GMTI时频同步误差去相关分析  

Distributed Spaceborne SAR-GMTI De-correlation Analysis of Time & Frequency Synchronization Error

作　　者：杨凤凤[1] 梁甸农[1] 张永胜[1] 

机构地区：[1]国防科技大学电子科学与工程学院,湖南长沙410073

出　　处：《信号处理》2008年第4期663-666,共4页Journal of Signal Processing

摘　　要：分析了时间、频率同步误差对分布式星载SAR系统相关性和干涉相位的作用,得到一个较全面的复相关系数表达式,讨论了同步误差对GMTI处理过程及性能指标的影响。指出目前的同步技术水平下,时频同步误差对干涉处理相关系数幅值的影响不明显,只影响干涉相位。线性干涉相位误差给GMTI独立同分布的样本选取造成一定困难,但可以通过去平地相位处理补偿。补偿后,时频同步误差对GMTI性能的影响可忽略。仿真验证了结论的正确性。The effects of time and frequency synchronization error on distributed spaceborne SAR interferometric correlation and phase were analyzed. A comprehensive expression of correlation coefficient was given. Then the effects on GMTI signal processing and its performance were discussed. We find out that, GMTI is not affected much, with the precondition that the interferometric phase error from the synchronization errors can be compensated and the local training pixels we selected keep independent identical distributed （iid）. Simulation proves the conclusions.

关 键 词：分布式星载SAR GMTI 同步 相关性 

分 类 号：TN918[电子电信—通信与信息系统] TN958[电子电信—信息与通信工程]