Integration of time-reversal mirror technique in short baseline positioning

摘要

Short baseline(SBL) system is one of the most significant systems for underwater positioning.In shallow water or littoral environment the system faces problems of large error in delay estimation and system instability because of severe multi-path.To address those problems,this paper proposes a SBL system transmitting a wideband signal combined with time-reversal.The effect of multi-path propagation on response signal is compensated by time reversal focusing which is derived from the channel multi-path characteristics.Results of simulations and actual experiments in lake show that the proposed scheme reduces errors in delay estimation.It is proved that time reversal mirror improves the accuracy and precision of underwater vehicle navigation and positioning.