多通道SAR-GMTI通道均衡和动目标检测定位方法

Novel approach to multi-channel SAR-GMTI channel equalization and moving target detection and location

针对机载多通道SAR-GMTI系统及其实测数据,提出了一种新的通道均衡方法和基于该均衡的动目标检测、定位方法.该方法先利用泄漏信号进行电路中信号均衡,后进行通道间快时间和慢时间校准并在距离压缩后通过迭代补偿通道差异,再经杂波对消和方位压缩实现动目标检测,最后通过估计动目标多普勒偏移的方法完成参数估计.该通道均衡方法不需要天线参数、平台运动参数等先验信息,避免了图像配准过程和自适应杂波相消过程,因而计算量小,易于实现.实测数据实验结果证明该方法杂波对消比达到20 dB,检测和定位性能好.

For an airborne multi-channel SAR-GMTI system and its real data, a novel channel equalization method is presented, on the basis of which a technique for moving target detection（MTD） and location is proposed. This method first realizes circuits calibration by utilizing the leaking signals, and then implements fast and slow time calibration and compensates the channel differences via iteration after range compression, after which MTD is realized by clutter cancellation and imaging and target parameters are obtained by estimating the moving target doppler shift. The channel equalization method needs no priori knowledge about the parameters of antenna and the plane＇s movement, and avoids image registration and auto adaptive clutter cancellation method. Thus it requires less computation and it is easy to realize. The experimental result of real data proves that the method can achieve a clutter cancellation ratio of more than 20 dB, and that it has a good detection ＆ location performance.