一种新的相干信号二维波达方向估计方法

IIn order to reduce the computation burden, we propose a new computationally efficient two-dimensional (2-D) directional-of-arrival (DOAs) estimation for coherent narrowband signals impinging on the L-shaped sensor array structured by two uniform linear arrays (ULAs). The coherency of incident signals is decorrelated through subarray averaging technique, and the null space is obtained through linear operator of two matrices formed from the cross-correlation matrix between the received data of two ULAs without eigendecomposition. The elevation angle and the quasi-azimuth angle are firstly decoupled and estimated, and the pair-matching of two groups of angles can be accomplished by using a novel method. Then by investigating the geometrical relation, the azimuth angle can be obtained. Furthermore the effectively of the proposed method is verified through numerical examples, and it is shown that the proposed method performs well at low signal-to-noise (SNR) and with a small number of snapshots.