Two-Dimensional DOA Estimation for Planar Array via Reduced-Dimension Capon

This paper discusses estimation of two-dimensional(2D) direction of arrival(DOA) for a planar array, and derives a reduced-dimension Capon(RD-Capon) algorithm.The first parameter is obtained by searching the spectrum peak of transformation of the covariance matrix, obtained from the received signal. The second parameter is estimated using least squares. The algorithm uses one-dimensional global search to achieve a joint estimation of 2D DOA. This algorithm based on one-dimension local searches can avoid high computational cost within 2D-Capon algorithm by spectrum peak search, with the performance close to the 2D-Capon algorithm. The proposed algorithm can obtain automaticallypaired 2D DOA estimation for planar array. It works well for the sources with the same azimuth(or elevation). Simulation results verify the usefulness of the algorithm.