非正侧视阵列机载雷达多空间角补偿算法

A Multiple Space Angle Compensation Method for Airborne Radar with Non-sidelooking Uniform Linear Array

非正侧阵列机载雷达的杂波分布随距离变化而变化,各距离单元的杂波分布不再满足独立同分布条件,造成统计型空时自适应处理(STAP)处理器性能下降。本文提出了一种多空间角补偿(MSAC)的非正侧视机载雷达杂波抑制方法,该方法先通过角度-多普勒补偿(ADC)预处理以消除在谱中心处的杂波非均匀,然后采用MSAC法在多个多普勒方向使参考单元和待检测单元的杂波谱保持一致,从而进一步消除在其余方位的杂波非均匀。仿真结果表明了该方法的性能明显优于ADC法,且运算量增加不多。

The clutter distribution of an airborne radar with non-sidelooking array varies with ranges,and samples in different range gates are not independent identically distributed vectors,so that the statistical spacetime adaptive processing（STAP）methods degrade.In this article,a new clutter suppression algorithm for an airborne radar with non-sidelooking,i.e.,the multiple space angle compensation（MSAC）method,is proposed.This method involves first a preprocessing with angle-Doppler compensation（ADC）to eliminate the non-homogeneity at the centers of the clutter spectrum in different range gates and then the MSAC to accomplish the alignment of the space angles of different range gates at multiple Doppler frequencies.Simulation results show that with only a little increase of the computation load the proposed method can further reduce geometry-induced non-homogeneity of a non-sidelooking array and outperform significantly the ADC algorithm.