基于干涉图的星载MIMO-SAR动目标检测  

Moving target detection for spaceborne MIMO-SAR based on interferogram

作　　者：王力宝[1] 许稼[2] 皇甫堪[1] 彭应宁[2] 

机构地区：[1]国防科技大学电子科学与工程学院,长沙410073 [2]清华大学电子工程系,北京100084

出　　处：《信号处理》2010年第1期23-27,共5页Journal of Signal Processing

基　　金：国家自然科学基金(No.60971087);航天科技重点创新基金(No.CASC200904);航空科学基金(No.20080158001);部委预研基金(No.9140A07051208JW0111)

摘　　要：受动目标径向速度影响,星载多输入多输出合成孔径雷达(MIMO-SAR)等效通道回波模型中将引入周期误差信号的调制,进而导致动目标方位像存在"假峰"效应,其会增加动目标检测的虚警。基于ATI(along track interferometry)干涉图,提出一种星载MIMO-SAR动目标检测方法。可在不补偿误差信号的前提下,先通过调节系统参数降低动目标"假峰"幅值,进而经干涉处理用杂波去弱化"假峰"干涉相位,最后利用ATI干涉图幅度和相位的联合处理实现动目标检测。数值试验验证了方法的有效性。Influenced by radial velocity of moving target, a periodically modulated signal will be introduced into echo model of equivalent channel for spaceborne MIMO-SAR. And there will appear the ＂spurious peaks＂ effect in azimuth image ,which can make false alarm rate hi gher. Based on ATI interferogram, a moving target detection scheme for spaceborne MIMO-SAR is proposed which needs not compensate error signal. Firstly, we can adjust system parameters to lower the ＂spurious peaks＂ magnitude of moving target, and then use clutter to weaken ＂spurious peaks＂ interferometric phase via interferometry processing. Finally, jointed processing for amplitude and phase of ATI interferogram is used to realize moving target detection accurately. The numerical experiments are also provided to demon- strate the effectiveness of the proposed method.

关 键 词：星载合成孔径雷达 多输入多输出 动目标检测 沿航迹干涉 

分 类 号：TN957[电子电信—信号与信息处理]