DOA Estimation by Exploiting the Symmetric Configuration of Uniform Linear Array

A new direction of arrival (DOA) estimation method is proposed for uniform linear array in this paper when both uncorrelated and coherent sources are present. The uncorrelated and coherent sources are estimated at two different stages. The uncorrelated sources are first estimated using conventional subspace methods, and then they are eliminated by exploiting the symmetric configuration of the array. Finally the remaining coherent sources are estimated by reconstructing a non-Toeplitz matrix. The number of sources resolved by our method can exceed the number of array elements. Simulation results demonstrate the effectiveness and efficiency of our proposed method.