The research of short baseline positioning integration of time-reversal mirror

The short baseline acoustic positioning technology is an important research of underwater moving target positioning.Considering the system usually worked in shallow water or in shore,in order to solve delay estimation error and system instability problem resulted in the multi-path channel,a SBL wideband method combining with timereversal technology is proposed in this paper,the method used short baseline element transmit the wideband signal to the transponder,which returned the signal to the SBL element location after time-reversal processing,the influence of multipath channel on response signal is reduced by using the adaptive focus on the channel multipath characteristic of the time reversal.Simulation and lake experiment indicate that the technology reduces the influence of multipath on the short baseline response signal time delay estimation and restrains the errors and outliers points in the navigation comparing with traditional position method,and finally the precision of underwater vehicle positioning and navigation is improved.