基于极化-空间谱特征的雷达目标检测方法

A Target Detection Method Based on Polarization-Space Joint Spectrum Characteristic

主瓣压制干扰是当前雷达界面临的重大威胁,具有接收增益大与目标时-频-空域差异小的主要特点而难以抑制,近年来利用极化滤波技术抑制主瓣干扰获得了重要的理论与实践进展,但对于主瓣多点源干扰、主瓣变极化干扰,现有方法仍然难以应对。采用"特征鉴别"的思路,提出一种基于极化-空间联合谱特征的目标检测方法,立足于发射极化分集体制,利用目标回波与干扰信号的极化散射特性差异,将目标检测问题转化为联合谱特征鉴别问题,能够有力提升雷达在主瓣多点源干扰、主瓣变极化干扰环境下的目标检测能力。

Because of the large antenna gain and the little difference with targets in the time-frequencyspatial domain,the mainlobe barrage interference has become an important challenge to radar detection.In recent years,suppressing mainlobe interference by using polarization filtering has gained significant theoretical and practical progresses.However,when there are multiple interference sources or variable polarization interference occurring in the radar mainlobe,the performance of existing methods is limited.In the view of characteristic identification,a target detection method based on polarization-space joint spectrum characteristic and polarization diversity is developed,which utilizes the polarization scattering difference between the target returns and the interference to transform the target detection into target identification.This proposed method can effectively enhance the capability of radar target detection under the background of multi-point source interference and the variable polarization interference in mainlobe.