Decoupled 2-D Direction of Arrival Estimation in L-Shaped Array

摘要

In this letter, we propose a novel decoupled method for 2-D direction of arrival (2-D DOA) estimation in L-shaped array. Specifically, in the proposed method, the Jacobi-Anger expansion is utilized to decouple the elevation angle from the azimuth angle, which means that the reconstructed manifold of the L-shaped array is the product of the two matrices of elevation and azimuth angles. Although the traditional 2-D MUSIC algorithm can estimate the elevation and azimuth angles without pair matching, it requires the complex 2-D spectrum peaks search. In order to simplify the searching procedure, the new formulation of the array manifold is applied in the Root-MUSIC algorithm, in which only 1-D elevation searching is needed to estimate the 2-D DOA and the azimuth estimates can be paired automatically with the elevation estimates. Simulation results are presented to confirm the effectiveness of the proposed method, and demonstrate that our proposed method achieves a better tradeoff between the performance and complexity than other existing methods.