An iterative method of direction-of-arrival estimation for coherent signals by using projection subspace

Appropriate subspace projection can be strengthening the characteristic of the desired signal power and the interference effect will decrease. The oblique projection operator (OPO) can remove the uncorrelated source signals from the covariance matrix and estimated the DOAs of the remaining coherent signals through the subspace projection method. In this paper, we propose a high-resolution direction of arrival (DOA) estimation method for the incident DOAs of highly correlated signals using iterative algorithm to update initial search angle such that the resolution of estimation of DOAs be improved. Finally, numerical example was analyzed to illustrate the performance of the proposed method and to confirm the designed procedure.