Research On The Algorithm Of Source Localization Based On Vector Hydrophone

While the marine field is developing,underwater acoustic signal processing has been widely used.As an important research direction of underwater acoustic signal processing,the acoustic source localization technology based on vector hydrophone is gradually applied to noise detection,sonar detection and positioning,underwater acoustic communication and so on.In the actual process of source localization,it is necessary to consider the utilization of array aperture,the coherence of source signal and wideband signal.In addition,the common sound source localization algorithm only realizes one-dimension localization,but cannot give the two-dimension spatial localization of the sources.Therefore,the two-dimension azimuth estimation algorithm based on Vector hydrophone is studied in this paper in different condition of source localization.The main work of this paper includes:Aiming at the problem of high computational complexity,large computational capacity and low precision of the vector hydrophone acoustic source location based on the four-order cumulants,a single vector hydrophone localization algorithm based on four-order moments is proposed.The algorithm uses the characters of four-order moments to expand the number of single vector hydrophone array and sound sources,obtains more information about source localization,reduces the redundancy of received information by the method of extracting effective elements,and obtains the desired location of acoustic sources by searching peak.Theoretical analysis and simulation results show that the algorithm can effectively reduce the complexity of the algorithm,improve the accuracy and overcome the deficiency of the vector hydrophone location algorithm based on High-order cumulants.In order to estimate the inaccurate angle and low resolution of the vector hydrophone coherent sound sources based on PM,a coherent source localization algorithm based on Vector hydrophone is proposed.The algorithm constructs the cross-correlation matrix by using the received signal,estimates the most approximate signal vectors by using the total least squares algorithm.The two-dimension DOA estimation based on the shift invariance property of the vector hydrophone array's manifold vectors is obtained,and the elevation and azimuth angles of the source signals are gotten.The simulation results show that the algorithm can decrease the ratio of error caused by the angle estimation,and its precision is high,and its complexity is close to the PM algorithm.To solve the problem of high complexity and unstable performance in the existing wideband coherent signal source localization method,a wideband coherent sound source localization algorithm based on vector hydrophone is proposed.The algorithm focuses on the acoustic pressure components and the vibration velocity components,focuses each signal frequency bands to the reference frequency,and accumulates the subband covariance matrix after focusing transformation.Finally,the wideband source signal is positioned by the shift invariance property of the vector hydrophone array manifold matrix.Simulation results show that the algorithm can effectively reduce the complexity of the algorithm,improve the accuracy of wideband signal location,and overcome the shortcomings of traditional wideband coherent signal localization algorithms.