Shallow Seafloor Reverberation Modeling and Simulation of Torpedo

To simulate the torpedo reverberation on shallow seafloor and reveal the effect of torpedo motion on the re-verberation signal, a seafloor reverberation simulation method is presented. In this method, the seafloor generating re-verberation is divided into several scattering units, and each scattering unit is equivalent to a system. Continuous wave(CW) signal and linear frequency modulation(LFM) signal are taken as torpedo active acoustic signal. In seafloor reverberation simulation, the scattering units can be small enough to keep the Doppler frequency shift produced by tor-pedo motion in each scattering unit is the same, thus the effect of torpedo motion on reverberation signal is revealed. Because each scattering unit is equivalent to a system, convolution can be used to compute reverberation signal. Simula-tion results show that the present method is of clear physical meaning and simple calculation. Moreover, the spectrum characteristic of the simulated reverberation signal is consistent with the basic theory of reverberation, verifying the validity of the method.