Abstract:

In order to estimate two-dimensional DOA (2-D DOA) fast in the presence of mutual coupling and coherent environments, a novel fast single snapshot DOA matrix method in the presence of mutual coupling (MC-SS-DOAM) is proposed for two-dimensional decorrelation and decoupling. The algorithm makes use of single snapshot from an especial array to constitute an equivalent receiving data covariance matrix, which can avoid the cumulation of snapshots. The diagonal form equivalent signal covariance matrix is acquired by decomposing the equivalent receiving data covariance matrix. Therefore, decorrelation can be accomplished. The mutual coupling coefficients can be isolated from a steering matrix and be absorbed into the diagonal elements of the equivalent signal covariance matrix. Therefore, decoupling can be accomplished. Moreover, the 2-D blind angle caused by mutual coupling coefficients is analyzed. The simulation results validate the feasibility of decorrelation and decoupling, the estimation performance of the algorithm using single snapshot is close to the performance of the direction of arrival matrix(DOAM) algorithm using 50 snapshots and is better than the performance of the DOAM algorithm using 40 snapshots.