Research On The Principle Of Vector Receiving Array For Dipping Sonar

Aerial dipping sonar is an anti submarine weapon in modern naval warfare.It has the advantages of strong maneuverability and high concealment to detect underwater and long-distance surface targets by helicopter borne dipping sonar.Vector hydrophone has directivity independent of frequency.The contradiction between the aperture of dipping sonar and the volume of helicopter can be solved by using vector hydrophone in the receiving array of dipping sonar.In this paper,the vector receiving array is applied to the airborne dipping sonar,the Cramer-Rao Bound of the vector hydrophone azimuth estimation is derived,and the processing method of the known signal of the vector dipping sonar is given.The target detection process of dipping sonar in active and passive mode is simulated and analyzed,including signal transmitting and receiving,target bearing estimation and target range estimation.In the aspect of direction finding,the directional performance of single vector hydrophone,uniform vector circular array and uniform sound pressure circular array as receiving array is compared.The possibility of using small volume vector receiving array to replace traditional large aperture sound pressure array is proved,and the feasibility of using single vector hydrophone to replace small volume low-frequency sound pressure array when the suspended sonar works in low frequency band is proved.In the aspect of ranging,several common sonar pulse signals are studied,and the influence of different transmitted signals on the range detection performance of dipping sonar target is simulated.On the premise of ensuring a certain ranging accuracy,the maximum detection range of single vector hydrophone,uniform vector circular array and uniform sound pressure circular array are compared.In view of the limited data processing ability of helicopter,the high-resolution ESPRIT algorithm for dipping sonar is studied,including ESPRIT algorithm for arbitrary shape vector and modal domain ESPRIT algorithm for uniform circular array.Finally,the experimental data of the lake test are processed to verify the correctness of the theoretical simulation.