METHOD FOR UNDERWATER TIME SERVICE AND SYNCHRONIZATION AND SYSTEM THEREOF

摘要

An underwater timing and synchronizing method and system is provided, in which a server provides an accurate time reference, and a client realizes local clock calibration through information interaction with the server. Specifically, when requiring clock calibration, the client transmits a request signal to the server, and uses the transmission time as the start time of the timing process. After receiving the request signal, the server performs time reversing processing of the received signal to obtain a responsive signal and then sends the same back to the client; moreover, the accurate transmission time of the responsive signal is sent to the client by means of acoustic communication. Due to time reversal mirrors' focusing features in time and space, all responsive signals are converged to the client, then the client convolutes the converged signal with the request signal to obtain a time reference signal, based on which the end time of the timing process is accurately determined, wherein the accurate transmission time of the responsive signal on the server is exactly the midpoint of the timing process.