| Vector hydrophone can measure the information of sound pressure and particle velocity in space,and realize the direction estimation of the target.Compared with the traditional hydrophone,vector hydrophone has obvious advantages.At present,most of the vector signal processing methods are based on the assumption of free field and isotropic noise field.When the vector hydrophone is installed on the underwater platform,due to the noise interference on the platform,it will affect the direction estimation of the target to a large extent,so it is necessary to study the vector direction estimation method under this condition.In this paper,according to the receiving characteristics of vector hydrophone,the spatial correlation function of isotropic noise field is derived;the vector characteristics and spatial distribution characteristics of acoustic field in marine environment are studied;the vector hydrophone is applied to subsea oil and gas underwater platform,the underwater platform model is established,the pipeline acoustic field simulation calculation is carried out,and the correlation coefficient of sound pressure and vibration velocity under typical frequency is obtained In this paper,the distribution law of vector sound field in underwater pipeline is studied,the single vector hydrophone bearing estimation methods such as particle velocity method,cross spectrum method and music algorithm are studied,and the bearing estimation performance of each algorithm is analyzed by computer simulation.Combining the adaptive algorithm with cross spectrum method,a vector bearing estimation algorithm under the condition of noise interference is proposed,which can estimate the vector signal mixed with background noise The simulation results show that the root mean square error is less than 3°.A set of data acquisition software is compiled and a sound vector system is built for lake test.The experimental data processing results verify the correctness and effectiveness of this research method. |
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