【Title】Towed line array sonar platform noise suppression based on spatial matrix filtering technology

【Author】HAN Dong;LI Jian;KANG Chunyu;HUANG Haining;LI Qihu;Institute of Acoustics,Chinese Academy of Sciences;Department of Communication Engineering,Dalian Naval Academy;College of IOT Engineering,Hohai University;

【Abstract】The spatial matrix filter was designed and used for solving the problem to detect a weak target who was influenced by the strong nearby platform noise interference of the towed Une array sonar.The MFP technology and the DOA estimation technology were combined together by using the sound propagation characteristics of both target and interference.The spatial matrix filter with platform noise zero response constraint was designed by the near-field platform noise normal modes copy vectors and the far-field plane wave bearing vectors together.The optimal solution of the optimization problem for designing the spatial matrix filter was deduced directly,and it was simplified by the generalized singular value decomposition.The total response error to the plane wave bearing vectors and the total response to the platform noise copy vectors were given.The phenomena that strong interferences existed in the bearing course and blind areas existed after filtering were analyzed by the correlation between the platform noise copy vectors and the plane wave bearing vectors.It could be found from simulations that it has less blind area and higher detection ability by using the spatial matrix filtering technology.