Abstract:

A novel direction of arrival (DOA) estimation algorithm for wideband sources is proposed. This technique estimates DOAs according to a new covariance matrix which is constructed by summing up the covariance matrices of various frequency bins. The new idea originates from the focusing transformation and its validity is proved theoretically. Afterwards, the optimal reference frequency is discussed in detail. The analysis of computational cost shows that the new algorithm has less computational burden compared with the conventional wideband DOA algorithms. Simulation results show that the new algorithm performs better than others and the criterion of choosing optimal reference frequency is also validated by simulations.