星载稀疏阵扫描模式干涉雷达动目标检测研究

地面动目标检测(GMTI)是星载分布式雷达的重要应用之一,利用星载稀疏阵可增加系统虚拟孔径,以改善动目标检测性能.扫描模式干涉雷达(Scanning Pattern Interferometric Radar,简称SPIR)是一种雷达天线阵波束扫描的新型GMTI雷达,用点扩展函数(Point Spread Function,简称PSF)与扫描结果进行解卷积,就能恢复出地物后向散射系数,然后利用杂波位置来检测动目标.本文分析了SPIR方法的基本原理,并对有不同位置误差的阵列进行了SPIR仿真,比较仿真结果发现,在一定误差范围内,准确测量孔径实际位置比精确控制孔径位置更重要.

The Study of Moving Targets Indication for Scanning Pattern Interferometric Radar of Spaceborne Sparse Array

Ground moving targets indication(GMTI) is an important application of spaceborne distributed radar.Distributed sparse array in space can improve the MTI performance with increased virtual aperture.Scanning Pattern Interferometric Radar(SPIR) is a new concept of radar for GMTI with point-spread-function(PSF) firstly obtained and then scanning this PSF through the patch cells.In signal processing stage,the echo signals from sparse array are deconvolved with PSF to retrieve the true reflection coefficients and positions of targets and clutter patches.The paper analyzed the basic principle of SPIR and tested its capability to deal with position errors existing in real situation.Simulations show that the accurate measurement for array position is more important than the accurate control of array position in some error range.