2-D Angle of Arrival Estimation with Two Parallel Uniform Linear Arrays for Coherent Signals

In this paper, a previously proposed estimator is extended to estimate two dimensional (2-D) angles of arrival of multiple highly correlated and coherent signals by using forward /backward spatial smoothing techniques. The special structure of the two parallel uniform linear arrays (ULAs) is exploited to estimate 2-D angles of arrival as polynomial roots. The computation complexity of the proposed method is discussed. Simulation results show that the proposed method can achieve higher resolutions and lower root mean square errors compared with DOA matrix method.