Underwater time service and synchronization method and system thereof

Abstract

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.

Description

technical field [0001] The invention relates to the field of underwater acoustic communication, in particular, a method and system for realizing accurate underwater timing and synchronization by utilizing underwater acoustic information interaction. Background technique [0002] An accurate time reference is very important for many underwater applications. In the underwater acoustic communication network, it is the basis of system synchronization; in the collection of marine environmental data, ocean exploration, pollution monitoring, and disaster warning, it is the guarantee of data validity; in the underwater navigation and positioning system, it is the basis for affecting positioning One of the important parameters of precision. However, there are still some defects in the existing underwater real-time timing and synchronization technology. [0003] Because high-frequency electromagnetic wave signals rapidly attenuate in seawater and cannot be transmitted over long dist...

AI Technical Summary

Problems solved by technology

[0019] The purpose of the present invention is to propose a new underwater timing and synchronization method and its system in view of the defects in the prior art, so as to solve the problem that the traditional method is affected by the multi-path and fluctuation effect of the underwater acoustic channel, thereby effectively improving timing and synchronization. synchronization accuracy and reduce the complexity of the timing system

Images