Mixed near field and far field sources localization algorithm based on MEMS vector hydrophone array

Abstract A mixed near and far field sources localization algorithm is proposed which applied to the uniform linear MEMS vector hydrophone array. The algorithm includes three steps: firstly, the steering vector contains common azimuthal information in both near and far field, direction-of-arrival (DOA) can be obtained by using the MUSIC algorithm. Secondly, the direction vector array is decomposed into different matrices and DOA and range are separated efficiently. All DOAs can be obtained through searching for a feature matrix. Thirdly, one-dimensional spectrum search in Fresnel zone is carried out to realize the accurate estimation of range in near-field. Finally, the performance of the algorithm was simulated. The results verify that the proposed algorithm can achieve DOA estimation within the range of [0:2*π] and solve the problem of port and starboard ambiguity. The vector matrix algorithm does not require construction the high-order cumulants and multi-dimensional search, and can avoid parameter matching procedure.

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