基于盲源分离的毫米波雷达抗雨杂波干扰研究

Research on Anti Rain Clutter Interference of Millimeter Wave Radar Based on Blind Source Separation

毫米波雷达信号在降雨环境下传播时,会产生雨杂波,对雷达目标测距精度产生较大影响。本文研究了毫米波雷达信号在降雨环境下的衰减计算方法,给出了单次散射情况下毫米波雷达的体反射率,明确了降雨环境下的雷达方程。并根据雨滴尺寸分布特性建立降雨环境下的雨滴谱三维分布模型与雷达探测范围模型,仿真分析了降雨环境下的雷达测距结果。提出了一种基于四阶累积量与正交联合近似对角化的盲源信号分离算法,对降雨环境下雷达混合接收信号进行分离,实验结果证明了该方法的有效性。

When millimeter wave radar signals propagate in rainy environments,they generate rain clutter,which has a significant impact on the radar target measuring distance accuracy.This article studies the attenuation calculation method of millimeter wave radar signals in rainfall environments,provides the volume reflectance of millimeter wave radar under single scattering,and clarifies the radar equation in rainfall environments.And based on the size distribution characteristics of raindrops,a three-dimensional distribution model of raindrop spectrum and a radar detection range model are established in the rainfall environment.The results of measuring distance by radar in the rainfall environment are simulated and analyzed.A blind source separation algorithm based on fourth-order Cumulant and orthogonal joint approximate diagonalization is proposed to separate radar mixed received signals in rain environment.Experimental results show the effectiveness of this method.