关键词: 相干分布源, 二维波达方向估计, L型线阵, 旋转不变矩阵, 传播算子法

Abstract: Based on L-shaped linear array, this paper presents a fast method for the two-dimensional （2D） Direction-Of-
Arrival（DOA） estimation of Coherently Distributed（CD） source. The presented method obtains two rotational invariance matrixes about the central DOAs of CD sources by one order Taylor approximation to the generalized steering vectors of two pairs of shifted subarrays. The central DOAs of 2D CD sources are estimated using a new propagator method to solve the rotational invariance matrixes. The method avoids spectrum-peak searching and the eigen decomposition of the high-dimensional sample covariance matrix in classical subspace methods. As a result, the computational cost is significantly reduced. Under small angular spread, the proposed method provides a good estimation performance and outperforms Sequential One-dimensional Searching（SOS） algorithm at low SNR. As the new method is a blind estimator, the prior information of the specific angular distribution shapes of distributed sources is not necessary. Simulation results demonstrate the effectiveness of the method.

Key words: coherently distributed sources, 2-dimensional Direction-Of-Arrival（DOA） estimation, L-shaped linear array, rotational invariance matrix, propagator method