Source location based on direction of arrival estimation and regional contraction

A new method is proposed for the source location with distributed sensor array. Firstly, the direction of arrival (DOA) of each subarray is estimated by the Multiple Signal Classification (MUSIC) group delay function. Secondly, the initial rectangular region is established from the DOA estimation. Finally, the regional contraction is performed based on the larger steered response power. The centroid of the final region is the source location. The group delay from the phase information of MUSIC spectrum can enhance the resolution of the DOA estimation. The region reduction is iteratively completed and substantially shrunk based on the virtual points´ larger steered response power. The simulation results show that the proposed method provides a more accurate source location with a stronger noise robustness than the traditional triangulation location method.