Sound Refocusing Simulation using Time Reversal Mirror in a Shallow Water Environment

Abstract

TRM(Time Reversal Mirror) principles are described in review papers of M. Fink, the inventorof TRM, and his associates. In Recent Choi carried out the study of the waveform and spatialfocusing experiment.In this paper it is considered the approach to predict TRM parameters based on the calculations of impulse response from underwater acoustic ray model in shallow water. The collection of impulse responses allows calculation of spatial structure of the TRM for variety of parameters. For simulation of acoustic source localization using time reversal mirror in the shallow water, we have to know the impulse response of the environment. Throughout this process we can reproduce an original signal at focal point. To apply this TRM simulation to shallow water environment, after extracting the impulse response about simple condition as shallow water, we analyze the acoustic focusing by TRM inversion.the approach to predict TRM parameters based on the calculations of impulse response from underwater acoustic ray model in shallow water. The collection of impulse responses allows calculation of spatial structure of the TRM for variety of parameters. For simulation of acoustic source localization using time reversal mirror in the shallow water, we have to know the impulse response of the environment. Throughout this process we can reproduce an original signal at focal point. To apply this TRM simulation to shallow water environment, after extracting the impulse response about simple condition as shallow water, we analyze the acoustic focusing by TRM inversion.