Efficient Method of DOA Estimation for Uncorrelated and Coherent Signals

In this letter, an efficient direction-of-arrival (DOA) estimation method is proposed with a uniform linear array when uncorrelated and coherent signals coexist. The method can effectively eliminate the possible false DOA estimates of uncorrelated signals, and only the true DOA estimates can be retained. After estimating the DOAs and power of uncorrelated signals, the information in them can be eliminated from the signal subspace. Then, we can obtain a matrix that only contains the information of coherent signals, which we call the C-matrix. Finally, the coherent signals are resolved with a new constructed matrix by the C-matrix. The theoretical analysis and simulation results confirm the effectiveness of our proposed method.