非圆传播算子DOA估计算法

摘要

Propagation method is a commonly used method in direction of arrival (DOA) estimation.However,when the number of sensors is small,the accuracy of estimation is not satisfying.Aiming at noncircular signals,a new noncircular PM method is proposed.Firstly,the received signal is extended.And then the extended signal is partitioned into two subarrays.Finally,the noncircular propagator is obtained by the conditional PM method.The method employs the combination of the noncircularity and the propagation method.It has neither the eigenvalue factorization of the extended correlation matrix nor the peak searching processing.So the computational load is much lower.The comparison and simulation prove that the proposed method has low computational load and good estimation accuracy.%传播算子方法(Propagator method,PM)是一种常用的波达方向估计算法,但传统PM算法在阵元数较小时估计精度较低.本文针对非圆信号,提出了一种非圆传播算子DOA估计算法.该算法首先对接收信号进行扩展,而后对扩展信号进行子阵划分,最后利用PM方法获得非圆传播算子.算法将信号的非圆特性与传统PM算法相结合,既具有传统PM算法无需计算协方差函数的特点,又去除了峰值搜索过程,减小了算法运算量.同时非圆特性的引入,使算法估计精度有了大幅度提高.通过计算量分析说明了算法的计算复杂度较小,并通过仿真验证了算法的有效性.