Spatially Close Signals Separation via Array Aperture Expansions and Spatial Spectrum Averaging

A resolution enhancement method for estimating the direction‐of‐arrival (DOA) of signals is presented. The proposed method is by virtually expanding a real array into virtual arrays and then averaging the spatial spectrum of the virtual arrays, each of which has a different aperture size. Superior DOA resolutions are shown in comparison with the standard algorithm, MUltiple SIgnal Classification (MUSIC), for incoherent signals incident on a uniform circular array.