Research On Passive Direction Finding Method Of Flank Array Based On Rectangular Baffle

The successful development of the vector sensor breaks the limitation of the traditional sound pressure hydrophone single receiving scalar sound pressure information,it can synchronously obtain the sound pressure and vibration velocity component information of the same point in the sound field.This advantage makes this technology has played a crucial role in the buoy sonar,towed array and other underwater acoustic equipment.At present,the research of vector hydrophones under the condition of free sound field is becoming more and more mature,and there is still room for improvement in the research of vector array under baffle conditions.Therefore,this paper studies the method of detecting the passive target on the flank array based on a rectangular baffle.In this paper,a model is established for acoustic pressure matrix and vector array respectively.Three kinds of beamforming algorithms,including conventional beamforming algorithm,minimum variance distortionless response algorithm and multiple signal classification algorithm,are studied and computer simulations are performed.Analyze their advantages,disadvantage and scope of application.The vector array signal processing technology combines the noise immunity of the vector hydrophone with the spatial resolution of the array system to further improve the performance of the sonar system.Computer simulations show that the vector hydrophone array has a higher gain than the sound pressure hydrophone array.Moreover,the vector array can reduce the size of the sonar array to a certain extent while solving the problem of ‘left and right blurry'.This article studies the characteristics of anti-baffle baffles.An acoustic back-reflection baffle model was designed and the rectangular air-blind baffle model was simulated.The computer simulation was used to analyze the anti-sound characteristics.The anti-baffle can effectively reduce the noise interference to the hydrophone and strengthen the signal to a certain extent,so that the performance of the hydrophone can be optimized.This paper studies the beamforming algorithm under the condition of rectangular air-blind baffles,analyzes the gain caused by the baffle to vector array target direction finding,the frequency applicability of the beamforming algorithm under baffle conditions,and the signal at different incident angles.The difference in direction finding accuracy.Finally,the outer field lake test data of the vector array is processed under the baffle condition,which verifies the correctness and effectiveness of the vector array beamforming algorithm in the baffle condition.