Subspace-projection-based networked radar inhibition pressing type main lobe interference method

基于子空间投影的网络化雷达抑制压制式主瓣干扰方法

Abstract

本发明公开了一种基于子空间投影的网络化雷达抑制压制式主瓣干扰方法,主要解决单站雷达只能抑制一种干扰类型的问题。其实现步骤是:1.计算各节点雷达的基带接收信号,并将其在时域上以干扰信号为准对齐,得到节点雷达阵列信号;2.估计节点雷达阵列信号的协方差矩阵,对其进行特征分解,并根据特征分解结果构造噪声子空间,计算向其投影的投影矩阵;3.将节点雷达阵列信号向噪声子空间投影,得到用于目标检测的投影矢量;4.根据用于目标检测的投影矢量,构造广义似然比函数;5.设定检测门限,并将广义似然比函数每个时刻点的值与检测门限比较,得到目标检测的输出结果。本发明能有效抑制不同类型的干扰信号,可用于网络化雷达系统。
The invention discloses a subspace-projection-based networked radar inhibition pressing type main lobe interference method which mainly solves the problem that single station radars only can restrain one type of interference. The subspace-projection-based networked radar inhibition pressing type main lobe interference method comprises steps of 1, computing base band receiving signals of all node radars, enabling the base band receiving signals to be aligned on the time domain with interference signals serving as the standard and obtaining a node radar array signal; 2, estimating the covariance matrix of the node radar array signal, performing characteristic decomposition on the covariance matrix, constructing noise subspace according to a characteristic decomposition result and computing the projection matrix of the projection of the noise subspace; 3, projecting the node radar array signal to the noise subspace and obtaining a projection vector which is used for target detection; 4, constructing a generalized likelihood ratio function according to the projection vector which is used for the target detection; 5, setting the detection threshold, comparing values of the generalized likelihood ratio function at any moment with the detection threshold and obtaining an output result of the target detection. The subspace-projection-based networked radar inhibition pressing type main lobe interference method can effectively restrain the interference signals in different types and can be used to a networked radar system.

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