Research On Underwater Sound Field Model Of Air Sound Source And Detection Technology

From a series of local wars in recent years,we can see that marine war plays an important role in modern war.Submarine in the sea battlefield has become a major combat power and get more and more attention.Anti submarine weapons came into being and the submarine is confronted with serious threats.This paper focuses on the study of underwater acoustic field excited by the air source and the location of the sound source target in the air,in order to against the anti submarine helicopters and improve the inferior status of submarines in marine warfare.In this paper,the three layers of air,sea water and seabed are stratified,namely in the air the sound speed is assumed as Epstein distribution,in seawater and seabed the sound speed is assumed as uniformly distributed,and analysis this model.By using the propagation matrix method and the fast field approximation method of wave number integration,the acoustic field excited by sound source in air is calculated.Based on the analysis of sound field excited by stationary sound source,the characteristics of sound field excited by moving sound source in air are analyzed.Based on the analysis of acoustic field excited by air source,the noise signal of helicopter is simulated.The process of passive location is finding the target direction by scalar matrix and vector array,estimating the signal frequency by adaptive filter,and then obtaining the motion parameters of the sound source in the air.