Broadband Sound Source Localization Method And Research

With the vigorous development of the marine field,acoustic invisibility plays a vital role for offshore work.Carrying out research on the localisation of underwater sound sources,determining the spatial distribution of underwater sound sources,and studying the impact of different types of sound sources on underwater platform is an important process for vibration and noise reduction.With the continuous development of vibration and noise reduction technology,the noise level radiated by the underwater platform is getting lower and lower,and it is no longer possible to obtain accurate information on the location of the sound source if the analysis method of underwater sound sources under far-field conditions is still used.Compared with narrow-band sound sources,wide-band sources can carry more information.Therefore,it is of great importance to study the localtion method of broadband sound sources.This paper analyzes the direction of arrival estimation algorithm of typical broadband sound sources,and on this basis,propose a source localisation algorithm based on a concentrically distributed double circular array and a source localization algorithm based on a combined arrays.The direction of arrival of sound sources under different frequencies and different signal-to-noise ratios.Firstly,the basic methods of sound source localization are analyzed,mainly for broadband sound source subspace classification algorithms and the near-field highresolution algorithms,and mathematical analysis and simulation are carried out.Secondly,the broadband source model and the receiving array model are analyzed,because there is a constant difference between coherent sound sources,a broadband coherent sound model can be established.The subsequent high-resolution algorithm proposed a two-dimensional direction of arrival estimation algorithm for coherent sources in a wide frequency band for wide-band far-field sound sources.The algorithm first calculates the centre frequency of the broadband sound source,and then constructs a real-valued beamformer to process the broadband sound source through the beamformer,and the processed data is searched for spectral peaks using a twodimensional subspace sound source location algorithm.The accuracy of the algorithm is verified by simulation analysis.Finally,for broadband near-field sound sources,a cylindrically distributed broadband sound source near-field high-resolution localization method based on vector sound pressure combined matrix is proposed.Establish a near-field sound source model with a cylinder as the measured surface,use the unilateral directivity of the vector hydrophone to solve the left and right chord ambiguity in the underwater near-field sound source location,and use a subspace classification algorithm to analyze the broadband sound source perform a peak search.The high-resolution characteristics of the algorithm are verified by simulation analysis.