Research On The Bearing Estimation Of Ship-borne Vector Array

Vector hydrophone has better performance than traditional acoustic pressure hydrophone,which can output not only the sound pressure information of signal,but also the vibration velocity information of three orthogonal directions.Sound pressure hydrophone needs array to estimate target azimuth,while a single vector hydrophone can execute the estimation of the target azimuth.With the development of vector hydrophone,more and more traditional acoustic pressure arrays are gradually replaced by vector hydrophone arrays.When the vector hydrophone works on the ship,the baffle is an indispensable part.The existence of baffles will affect the performance of vector hydrophone target azimuth estimation.It is meaningful to study the vector array target bearing estimation algorithm under baffle condition.In this paper,the acoustic pressure array beam forming algorithm is firstly discussed and then discuss the vector array beam forming algorithm and the average acoustic intensity algorithm.A beam forming algorithm based on sound intensity information is proposed by analyzing the correlation between sound pressure and vibration velocity.The algorithm uses the intensity information obtained by non-integral periodic integration with azimuth information,and then uses beam forming algorithm to process the intensity information.The algorithm is applied to target azimuth estimation under low signal-to-noise ratio(SNR)conditions.The beam forming algorithm under baffle condition is also studied in this paper.In this paper,the acoustic characteristics of the air chamber baffle are analyzed,and the reflected sound is obtained based on the analysis.Then the beam forming algorithms of vector linear array and vector cylindrical array under baffle conditions are studied.The target azimuth estimation algorithm based on the combined processing of acoustic pressure and vibration velocity is applied to the vector linear array under the condition of baffle,and the performance of the algorithm is verified by simulation.Finally,by processing the measured data of the vector cylindrical array,the validity of the beam forming algorithm under the condition of baffle is verified.