DOA Estimation for Uncorrelated and Coherent Signals with centre-symmetric Circular Array

A new direction of arrival (DOA) estimation method for the centre-symmetric circular array is proposed to cope with the scenario where both uncorrelated signals and pairs of coherent signals are presented. By constructing a centre-symmetric array manifold and exploiting its properties, coherent signals in pairs can be decorrelated and then estimated without the interference of uncorrelated signals, while the uncorrelated signals are estimated by utilizing the uniqueness condition of array manifold. The two-stage estimation method is simple but effective. It does not need beamspace transform and is performed directly in element space. It has higher estimation precision. Simulation results demonstrate the effectiveness and efficiency of the proposed method.