The Research on Simulation of Seabed Reverberation Model Based on Multi-beam Sounding System

摘要

The fundamental principle of the physical properties and the spatial correlation characteristics of seabed echo signals are expounded, and a simulation model of seabed reverberation is suggested in this paper. In the shallow water environment, acoustic signals are transmitted in the form of spherical wave in the near field. The cell scattering model is introduced to simulate seabed backscattering in this paper. The effects of some factors are analysed, including: spherical extended loss of the acoustic propagation; absorption loss of acoustic propagation; and, seabed reflection loss in the seabed echo signals. This makes it possible for the seabed simulation signals to reflect to the maximum extent the actual situation of the seabed. The statistical characteristics of the multi-beam seabed echo simulation signals are researched, and a seabed target distribution map is effectively obtained by the realization of beamforming. The simulation results show that the characteristics of the seabed echo signals conform to the characteristics of reverberation signals, described by Ol'shevskii B.B in "Oceanic reverberation statistical properties". The validity of the seabed echo signal model is verified.