Fast ESPRIT algorithm for 2D DOA estimation

To avoid estimation of whole covariance matrix and noise power, reduce times of singular value decomposition, and enhance real time property of algorithm of DOA, the fast estimation of signal parameter via rotational invariance techniques (ESPRIT) was proposed. The sub-blocks of covariance matrix, which is not affected by noise, were used to estimate the parameters of DOA. The computer simulation was performed and the relation of signal to noise ratio and the number of array elements with root mean square of DOA were discussed. The results have shown that the performance of the algorithm is approximate to that of PRO-ESPRIT, but an amount of computation decreases greatly.