Design And Application Of Beaded Cilia Vector Hydrophone

MEMS bionic vector hydrophone has been widely used in sonar buoy,UUV and other small combat platforms because of its small size,good low frequency response,batch production and other advantages.However,with the development of acoustic stealth technology,the radiated noise of underwater moving targets such as submarine and torpedo is getting lower and lower,which greatly increases the difficulty of target detection of hydrophone.Therefore,how to improve the low-frequency detection performance of the hydrophone is of great significance.In addition,due to the complex and changeable marine environment such as tides,winds and waves,the hydrophone often produces complex attitude changes such as rotation and tumbling when detecting the target,resulting in the inaccurate detection of the actual azimuth of the target.it is a key problem in the application of hydrophone in small motion platform.In order to solve the above problems,the main research of this paper is as follows:(1)To solve the problem of low sensitivity of MEMS bionic vector hydrophone in engineering application,a beaded cilia vector hydrophone is designed.In target detection,the beaded cilia structure can expand the receiving area of sound waves,thus improving the sensitivity of the hydrophone.Through theoretical analysis and simulation,the optimal structural size of beaded cilia is determined,and the feasibility of the design is verified by statics and dry-wet modal simulation.Then the secondary integration of cilia and cross beam is realized by using the secondary integration platform.finally,the sound pressure channel and the packaging shell of the hydrophone are designed,and the physical preparation of the vector hydrophone is completed.(2)To solve the problem of inaccurate target orientation caused by the attitude change of the hydrophone,the attitude sensor is coaxially encapsulated with the beaded vector hydrophone to detect the attitude change in the geographic coordinates of the hydrophone in real time.Based on the conversion relationship between measurement coordinates and geographic coordinates,an attitude correction direction finding algorithm for single vector hydrophone based on beamforming algorithm is proposed.Finally,using the real-time attitude change information of the hydrophone,the azimuth estimation of the target in the geographic coordinate system can be realized,and the orientation error caused by the attitude change of the hydrophone can be reduced.(3)Based on the principle of comparative calibration,the sensitivity and directivity of the hydrophone are calibrated by the vector hydrophone calibration system,and the withstand voltage experiment is carried out by using the marine environment simulation tester.Then calibrate the attitude sensor,and finally verify the attitude correction direction finding algorithm through the outfield lake test,which lays a foundation for the engineering application of the hydrophone.