一种新的波达方向和多普勒频率估计算法

基于均匀圆形阵列，提出了一种同时估计空间非相干信号源方位角、仰角和多普勒频率的快速算法。该方法对均匀圆阵的输出信号进行模式空间转换，使得阵列流形具有类似于均匀线阵的形式，然后通过构造相应的数据矩阵得到传播算子的最小二乘（LS）估计，并由传播算子构造出一个特殊的低维矩阵，其特征值给出多普勒频率估计，特征向量舍有阵列流形的信息。结合模式空间阵列流形的性质，给出了一种DOA估计的总体最小二乘算法，在低信噪比条件下可提高测向精度。该方法不需要谱峰搜索和参数配对，具有运算量小的优点。计算机仿真验证了该方法的有效性。

A Fast Algorithm for Estimating DOA and Doppler Frequency of Signals Based on Uniform Circular Array

A fast algorithm is presented to estimate the 2-D direction-of-arrivals(DOA) and Doppler frequencies of uncorrelated signals based on 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 uniform linear array(ULA),then the LS estimation of propagator method(PM) is realized by the data matrix constructed,the Doppler frequencies are found by the eigenvalues of a low dimension matrix constructed by the propagator method,at the same time its eigenvectors also contain the information on array manifold of mode space.And then the total least squares method for 2-D estimation is proposed using the properties of the array manifold,it can improve the accuracy of DOA estimation when the SNR is lower.The method avoids the parameter pairs and the spectrum peak searching,and reduces the computation.The performance of this method is demonstrated by simulations.