Subarray effect on MUSIC for Partial adaptive arrays

Multiple Signal Classification (MUSIC) is one of the efficient super resolution algorithms, which can be used for angular super resolution in Radars. The large antenna array is divided into sub arrays and only sub array outputs are used to estimate the spatial spectrum in order to reduce the system complexity and computational load. Only local super resolution can be achieved with sub array outputs by forming the array manifold vector with sub array phase centers and gains. The spatial spectrum and sub array formation are closely related. In this paper the effect of grating lobes on the original main lobe by using Spot-light MUSIC is explained in detail. The ambiguity in the local super resolution has been discussed with simulation results for the planar arrays.