基于均匀圆阵的信号源DOA和多普勒频率估计算法

本文研究均匀圆形阵列的信号处理问题 ,提出了一种同时估计空间非相关信号源方位角、俯仰角和多普勒频率的算法 .该方法对均匀圆形阵列的输出信号进行模式激励 ,使其阵列流形具有类似于均匀线性阵列的形式 ;在此基础上 ,特征分解构造的波达矩阵 ,由特征值获得各信号的多普勒频率 ,由各特征值对应的特征向量处理得到对应信号的到达方向 .该方法不需进行谱峰搜索 ,运算量小 ,能实现信号的方位角、俯仰角和多普勒频率的自动配对 ,且具有相当高的分辨率 .给出的计算机仿真结果证实了该方法的有效性 .

An Algorithm for Estimating DOA and Doppler Frequency of Signals Incident on Uniform Circular Array

A new algorithm is presented to estimate the azimuths,elevations and Doppler frequencies of uncorrelated signals incident on a uniform circular array (UCA).Firstly,the mode excitation method is used to transform the manifold matrix of UCA into one with a form similar to that of a uniform linear array (ULA).The estimation of Doppler frequencies and DOA can be obtained from the eigenvalues and the corresponding eigenvectors of the DOA matrix respectively.This method is computationally efficient with comparatively high resolution,with the azimuths,elevations and Doppler frequencies of incident signals easily obtained and automatically combined without spectral search.The performance of this method is demonstrated by simulations.