Direction of arrival estimation using sum co-array of coprime arrays

In this paper, direction of arrival (DOA) estimation using sum co-array of coprime arrays is studied. The array geometry can be represented as the kronecker product of those of two coprime arrays. This array structure can reduce the aperture loss when extracting the subarrays, which are jointly used to achieve high resolution and unique DOA estimation via low computational propagator method. Compare to original coprime arrays based method, the proposed algorithm achieves better estimation results. Besides, the proposed method has low complexity for it requires neither peak search nor eigenvalue-decomposition. Simulation results verify the effectiveness of the proposed approach.