机载雷达主瓣杂波抑制的投影矩阵方法

在机载单通道雷达的运动目标检测中,若雷达相干处理的Dopp ler分辨能力差于主瓣杂波Dopp ler谱宽,在Dopp ler域主瓣杂波无法与慢速目标有效区分,这给运动目标检测带来了很大的困难。文中提出的投影矩阵方法首先在时域将主瓣杂波滤除,然后进行多普勒滤波,由于主瓣杂波被有效抑制,系统对慢速目标的检测能力大大提高。理论推导和仿真实验证明,投影矩阵方法在主杂波之外信噪比损失性能比三脉冲相消方法有明显的改善。

Projection Matrix Method for Suppressing Mainlobe Clutter of Airborne Radar

In single channel moving target detection of airborne radar,if radar Doppler resolution of coherent process is worse than the width of mainlobe clutter spectrum,mainlobe clutter and slow moving target can not be effectively differentiated,which will give rise to great difficulty in detection of moving target.A projection matrix method is presented in order to reduce the effect.The method suppresses mainlobe clutter in time domain using projection matrix,and transforms the data into Doppler domain.Since mainlobe clutter is suppressed effectively,the performance of system on detection of slow moving target is great improved.At last a comparison on signal-to-noise ratio loss between projection matrix method and three-pulse canceller is made.Theoretical derivation and simulation show the improvement on signal-to-noise ratio loss compared with three-pulse canceller.