Reverberation spectrum modeling and simulation of arbitrary sea bottom shape

Bottom reverberation modeling often regards seafloor as a flat surface, but in practical application it is not the case, simply regarding seafloor as a plane to model is not accurate. In order to solve this problem, reverberation spectrum modeling of arbitrary bottom shape has been built and a simplified calculation method regarding the simulation of the modeling has been provided. By dividing sea bottom into grids, using curved surface equations to describe the shape of sea bottom, Newton iteration method is used to work out the arbitrary point coordinates. According to the relative position relations and azimuth information between bottom cells and moving platform, the motion spectrum of different Doppler cells is calculated. Motion spectrum and the energy spectrum of transmitted signal are convoluted to get the reverberation spectrum of arbitrary sea bottom shape. Simulation results of two reverberation spectrums with different sea bottom shapes match with theory analysis.