基于空间差分算法的相干信号二维DOA估计

针对传统解相干算法对阵列孔径利用率不高的问题，提出了一种改进的空间差分算法，通过重构子阵之间的协方差矩阵，将阵列接收信号协方差矩阵的所有自相干信息和互相关信息充分利用，再通过建立差分矩阵，利用空间差分算法去除噪声的影响。最后采用传播算子（PM）算法完成二维波达方向（DOA）估计。仿真结果表明，该算法相比传统解相干算法，解相干效果较好，角度估计精度有较大的提高。

An Improved Spatial Differencing Algorithm for 2 Dimensional DOA Estimation of Coherent Signals

Aimed at the problem that the utility of the traditional decorrelation algorithm to the array aperture is poor, this paper proposes an improved spatial smoothing algorithm. All the data information of the covariance matrix received signals are utilized fully by reconstructing sub array covariance matrix, and the spatial differencing matrix is built to suppress the effect of noise. Finally, the propagator method algorithm is adopted to estimate 2 dimensional direction of arrival (DOA). The simulation shows that this algorithm is good in decorrelation algorithm, and high in computation precision compared with the traditional decorrelation algorithm.