Research On Algorithm Of DOA Spectrum Estimation Based On Vector Hydrophone Linear Array

Compared with the pressure hydrophone,vector hydrophone which is composed of pressure hydrophone and particle velocity hydrophone has the ability of measuring the acoustic pressure and Vibration velocity parameters in the sound field at the same time concurrent,which has a DOA estimation ability.Signal processing system which is based on vector sensor has received domestic and foreign scholars' wide attention and research due to it's higher ability of parameter estimation and Source detection probability.The development of sub-space of high resolution DOA estimation algorithm has offered a new method to solve the problems of detecting and Positioning the underwater targets.Under this background,this paper will make theoretical researches and simulation experiments on the DOA estimation of the CBF?MVDR?high resolution and fast sub-space high resolution in the vector hydrophone line array.Firstly,this paper detailedly introduces the research significance and development history of the vector hydrophone line array,and then research the application of conventional resolution technology on the ideal homogeneous vector hydrophone line array.In this part,this paper firstly researches on CBF and combined velocity beam-forming,then researching the MVDR algorithm on the vector array in order to realizing the adaptive processing the non-ideal environmental conditions and improving the array target resolution capability.According to the simulation results,we can conclude that signal processing of vector array can solve the problem of left-right vague of the target and higher anti-jamming than sound pressures array,and MVDR has a higher ability of target resolution and anti-jamming.In order to break the Rayleigh limit of the CBF,this paper applies the MUSIC,ESPRIT sub-space high resolution DOA estimation algorithm to vector hydrophone linear array model,from the simulation results,finding that in the conditions of low SNR or adjacent source of the signal,high resolution DOA estimation algorithms based on vector array has sharp spectral peak,it can distinguish adjacent target signal sources accurately and improve the target discrimination ability of CBF,MVDR algorithm.Complex calculation has limited the traditional sub-space high resolution algorithms development and application,although it has many advantages.To solve this problem,this paper researches the reduced dimension adaptive filtering technology of MSWF to estimate the sub-space quically,which is applied to sub-space high-resolution DOA estimation algorithms of vector array.Simulation results show that fast sub-space high resolutionalgorithms based on the vector array significantly reduced the amount of calculation and shorten the operation time,but has a lower DOA estimation performance.Finally,the data processing results of Lake trial is basically the same as Analysis and Simulation of the algorithm in this paper,which is Verifying the correctness of the DOA estimate algorithm of the paper,so that,the vector array processing technology,as an emerging technology,has a great practical and development prospects...