Reverberation Signal Simulation And Inhibition Technology Of Reverberation Based On Multistatic Sonar

Exploration and development of our country's Marine power have very important significance for our country.And double/multiple base sonar system overcomes the traditional shortcomings of single base sonar.And it has the advantages of flexible configuration,flexible,large detection range,good concealment,strong anti-jamming capability,and has become important tool of ocean exploration.In shallow sea,the influence of bottom reverberation is extremely serious.Studying the characteristics of double/multiple base reverberation signal and its suppression technology is extremely important.Reverberation seriously influence on the performance of the active sonar,therefore,reverberation intensity prediction and simulation of sonar reverberation signal are of unusual significance for the design and use.With multi-beam sonar system and the application of complex coherent signal processing technology,the only known reverberation intensity and reverberation intensity attenuation law of information is not enough,also need to know the active sonar receiver receives the reverberation time series,this request according to the sonar platform configuration,simulation modeling environment factors on the reverberation signal.And bottom reverberation is the main factor that influence the working performance of the active sonar,so this article focuses on the seabed reverberation signal and its features.This article focuses on the seabed reverberation signal and its characteristic and reverberation suppression technology.This paper mainly divides into two parts,the first part mainly is the bottom of the sea three-dimensional scattering intensity calculation,reverberation signal simulation and characteristics analysis;the second part mainly is the reverberation signal suppression technology research.The first part firstly studies the calculation method of underwater three-dimensional scattering intensity of double base sonar system,and simulates the three-dimensional simulated seabed scattering intensity,studies the influence of the scattering Angle,azimuth Angle,Angle of incidence and scattering grazing Angle.Combined with the ray acoustics theory knowledge,only considering a seafloor scattering case,research calculation method of bistatic seafloor reverberation signal,and validation analysis was carried on.Based on analyzing data,research the properties of reverberation signal spectrum characteristics,and the time-frequency characteristic,and analysis the difference of reverberation level between single and double base receiver.In the second part,first of all,this paper proposes a simple and effective reverberation suppression algorithm,using the filter to extract the reverberation signal envelope,smooth reverberation of received signal,without losing the transient characteristic of target echo,based on getting the reverberation suppression effect.Then based on the energy characteristics of LFM signal,LFM signal in different order fractional Fourier domain will form different energy features,and will be formed on the peak in fractional Fourier domain,target echo signal because contains geometric composition,will form a peak through fractional Fourier transform.And reverberation will have more than one peak,and be in clutter.Using FRFT this paper can signal detect and recognize through estimating parameters of target echo,and effectively eliminate reverberation interference signal through FRFT domain filtering processing.Considering the characteristics of the reverberation and the target spatial correlation difference,combined with more platform configuration relations,using cross-correlation analysis algorithm to improve the detection performance of target echo signal reverberation background.