低角雷达多径误差抑制的盲分离方法

摘要

由地面或海面对电波反射形成的多径效应会影响低角雷达的探测精度,严重时还会使雷达丢失跟踪目标.为了减小低角雷达在测量低空目标时的多径误差,根据工程实际需求,从雷达数据处理的角度提出了一种抑制低角雷达多径误差的盲分离方法.首先建立雷达测童信号模型,再根据雷达信噪比越大盲源分离效果越好的特点,建立信噪比目标函数,最后通过求解特征向童得到盲信号分离矩阵,得到雷达经目标反射的直接波测量数据,从而达到抑制雷达多径误差的目的.实验结果表明,在无需任何先验知识的情况下,利用此方法可在一定程度上抑制雷达多径误差,进而提高雷达测量精度.%The radio waves which are reflected by the ground or the sea may cause multipath effects and affect the low-angle radar detection accuracy,which can even make the radar lose the tracking target. In order to reduce the multi-path error,a blind separation method for suppressing low-angle radar multipath error was proposed from the angle of the radar data processing. Firstly we established a radar surveying signal model, then built up a Signal-to-Noise Ratio (SNR) objective function according to the characteristic of the radar, I.e. ,the bigger the SNR,the better the blind source separation effect. Finally,we obtained the blind signal separation matrix and the direct wave measurement data,which can achieve the purpose of suppressing radar multipath error. The experimental result shows that this method can suppress the multi-path error to a certain extent without any prior knowledge, and can improve the measurement precision of the radar.