Underwater Target Signal Detection And Azimuth Estimation Based On The Pressure-Gradient Type Vector Hydrophone

Vast ocean bears extremely rich biological,vegetation,energy and minerals.The peaceful development and utilization of marine resources,military security and confrontation are inseparable from the underwater information technology.Owning the high-precision technology of the marine target detection,azimuth resolution and identifying would reflect the overall strength of a country's maritime sovereignty.Vector hydrophone is a new technology with the development of marine equipment and technology.Through space concurrent,synchronous measurement of each components of sound pressure and particle velocity,vector hydrophone realizes the target positioning and multi-object resolution of the ocean by getting the sound source intensity vector information and orientation.This article is based on the principle of two-dimensional pressure-gradient type vector hydrophone,proposing a sound pressure and velocity joint signal processing method which improves the performance of estimating the target bearing,on this basis,we also designed a two-dimensional pressure-gradient type vector hydrophone receiving system.The full text includes: discuss the research background,research status at home and abroad,complete the receiving system design scheme of the pressure-gradient type vector hydrophone;establish a single vector hydrophone receiving signal model by the combination of pressure-gradient type vector hydrophone.Under the condition of narrow band,beam forming of different sound pressure and vibrating velocity combination are simulated.Also we establish a correlation equation of single target with a double objective of sound pressure and particle velocity,by getting azimuth angle we may realize estimation of target bearing;study the theory of genetic algorithm,propose a hybrid genetic algorithm and complete the simulation of the single target tracking and dual-target resolution;complete the design and simulation of the analog signal receiving circuit;complete the design of the data acquisition system and do some personal computer control interface programming;complete the test and analysis of the two-dimensional pressure-gradient type vector hydrophone receiving system.