多通道SAR频率多普勒域宽带长CPI STAP方法

摘要

在频率-多普勒域,提出了一种适合多通道SAR系统的宽带长CPI(Coherent Processing Intervals)STAP(Space Tune Adaptive Processing)方法.该方法突破了传统STAP方法"距离走动不能超过一个距离分辨单元"的限制,能够适应运动目标沿时间维/空间维的跨距离单元走动,从而能够利用长的相干积累时间和长基线,其运动目标检测和速度估计性能远远优于传统的GMTI(Ground Moving Target Indication)方法.%A new STAP method is proposed suitable for multi-channel SAR system:the frequency-Doppler domain wideband long CPI STAP method. The introduced method can adapt to the range walk along slow time and space dimension,so it can make use of both long CPI and long baseline. By utilizing the large bandwidth of the SAR system, the ~ method can e elminate the blind speed introduced by long sparse baseline. The introduced method can detect moving targets even with small non-zero range velocities or non-zero azimuth velocities,and can estimate their range and azimuth velocities.