Research On Underwater Sound Source Location Method In Wharf

The radiated noise generated by the underwater vehicle during operation is the main source of detection and tracking by the other party.In order to improve the survival ability and combat ability of the underwater vehicle,it is crucial to locate and process the sound source generated by the underwater vehicle,among which the location of the sound source in the dock environment is an important link.Based on near field sound source location,this paper studies the principle and method of near field sound source location algorithm,establishes near field sound source measurement model and model reception model,and carries out experimental simulation for different near field sound source location algorithms,and analyzes the characteristics of near field sound source location algorithm.In this paper,the acoustic source measurement model and signal reception model based on ray acoustics are established by taking the dock environment as the sound field measurement and using the horizontal array as the receiving matrix.The passive time reaction principle under the dock environment is studied and the mathematical model of passive time reaction is derived.Secondly,aiming at the narrowband signal source in the dock environment,the focusing beamforming algorithm in the dock environment using passive time-reverse technology is studied,which solves the problems of multi-path effect interference and low low frequency resolution in the dock environment.Thirdly,for the non-coherent wideband signal source,an algorithm combining the ISM focusing beamforming method based on subband decomposition and the passive time-reverse technique is proposed to solve the problem that the narrow-band algorithm can not directly locate the wideband signal.For the coherent wideband signal,the two-side transform based TCT method of CSM algorithm is used,and it is combined with passive time inverse technology to solve the problems of decoherence and low positioning accuracy of coherent signal.Finally,a cylindrical high resolution focusing beamforming algorithm based on passive time inversion is used for narrow-band sound sources in cylindrical distribution.For cylindrical coherent wideband sound sources,a TCT high resolution focusing beamforming algorithm based on passive time inversion is used.It solves the problem that the positioning accuracy decreases due to the interference of multi-path effect and the distribution characteristics of cylindrical sound source.Moreover,the simulation experiments of the above algorithms show that the high resolution focusing beamforming algorithm ac MVDR based on amplitude compensation can improve the spatial resolution of low frequency band,and the passive time reverse technology can reduce the multi-path effect interference in the dock environment,and the conclusion that combining the two algorithms can greatly improve the positioning accuracy of the algorithm is validated.