一种基于波束空间的非相关信号源DOA估计方法

针对非相关信号源的到达角估计,本文基于波束空间信号输出协方差矩阵的对角阵特性,建立了信号到达角估计的最小化代价函数.采用DFT波束形成矩阵,借助于矩阵分解变换,保持了阵列流形的Vandermonde结构,并由此将代价函数转换为二次函数形式,得到信号源到达角的精确估计.仿真结果表明该算法具有更快的运算速度,更低的分辨力门限及高的估计精度.

A Novel Method for DOA Estimation of Uncorrelated Signal Based on Beamspace

For DOA estimation of uncorrelated signals, a minimum cost function is presented, and it is based on the diagonal covariance matrix of uncorrelated signals in beamspace. And DFT matrixes are introduced as beamforming matrixes. By matrix transform,the influence of beamforming matrix is overcome, and the Vandermonde structure of array manifold is kept. With the structure characteristic, the cost function is transformed to a quadratic function. Then accurate estimations can be easily achieved. Simulation shows that the proposed algorithm can provide accurate estimation efficiently, with lower resolution threshold.