Modeling And Simulation Of The Reverberation Signal Under The Ice And The Research Of The Statistical Properties

When acoustic detection,communications and other types of work under the ice in the ice cover of ice, due to the presence of ice-water interface will form a strong reverberant field, the reverberation of this field is the mainly interference in the detection of active sonar and the main limitation of the system performance. so the research of the theoretical model and statistical properties of the reverberation of ice have great significance for the sonar detection and the technology of the anti-reverberation.In this paper,under the premise of reviewing of the status quo and significance of the domestic and foreign of the reverberation under the rough ice. The nature of the rough fall the ice covering the sea of the nature into two categories: the flat ice of the little rough on the surface and not flat ice with the ice ridges under water. First,it is divided into three modeling methods according to the different modeling theory and different scope of applications. Mainly including the establishment of reverberation simulation model under the ice of unit-scattering theory on the basis of scattering law of Lambert; the establishment of reverberation simulation with ice ridges model under the ice of unit-scattering theory on the basis of the scattering theory of BT; the establishment of reverberation simulation under the ice of the theory of the integration of Helmholtz based on the theory of Kichhoff-approximate;trying to calculate the reverberation of the elastic ice with ridges using the model of the finite element under the ice. Secondly,analyzd the statistical characteristics of the reverberation simulation for the two types of the ice above, including the statistical properties of the instantaneous value of the reverberation of ice;the statistical properties of the distribution of the reverberation envelope; the time-spatial characteristic of the reverberation under the ice;the correlation characteristics of the scattering radius with the flat ice and the correlation characteristics of the distribution of ice ridges. And draw relevant conclusions, the instantaneous value of the reverberation is Gaussian distribution,the envelope of the reverberation is Rayleigh distribution and the correlation with versus frequency and so on.The conclusions are consistent with theory.