一种新的MIMO SAR/MTI空时等效重构方法

摘要

多输入多输出合成孔径雷达(MIMO SAR)是一种新体制的成像雷达.针对高空高速平台的SAR系统方位向口径(或方位向分辨率)和作用距离的设计矛盾,采用MIMO体制有效地解决了PRF设计的问题.并针对多通道MTI模式提出了一种新的MIMO SAR空时等效重构方法,使得系统有效地兼顾了SAR模式和MTI模式.与常规的SAR/MTI系统相比,MIMO SAR/MTI系统在SAR模式下可以实现远距离高分辨率宽观测带成像;在MTI模式下,可以实现远距离运动目标探测,且具有高的运动目标检测性能和定位精度.%In this paper, the contradiction between azimuth antenna size(or azimuth resolution) and radar detection range in near space high speed platform SAR/MTI system is analyzed.The technique of multiple-input multiple-output, which can be used to resolve the contradiction, is used in SAR imaging mode.Subsequently, a novel space-time equivalent reconstruction method, which can get a high performance of detection and location in MTI mode, is presented.