Angular Resolution of Closely Spaced Signal Sources Using a Two-Dimensional Antenna Array on the Basis of the Minimum-Polynomial Method

We consider the problem of estimating the angular coordinates of closely spaced signal sources using a rectangular antenna array with an arbitrary number of rows and columns. This problem is solved using the superresolution method of the minimum polynomial, which was previously proposed for the one-dimensional case of the angular resolution of signal sources. Two approaches to using this method are proposed, namely, the pseudospectral and the root techniques. The computational complexity is analyzed. A simpler alternative method for developing the resolution polynomial is also proposed in the special case of a two-row (two-column) antenna array for the root approach. The simulation results show the high efficiency of the angular resolution of the signal sources using the proposed methods.