UTC high-precision time synchronization method based on optical transmission network

Abstract

The invention discloses a UTC high-precision time synchronization method based on an optical transmission network. In the invention, time base signals are transmitted by the optical transmission network between a primary station between a secondary station: firstly, the time base is transmitted to the secondary station by the primary station, and then time interval deviation is calculated by the secondary station based on time shown by a local clock of the secondary station and the time base; secondly, the local clock of the secondary station is corrected by the secondary station based on thetime interval deviation and a checked time base is returned to the primary station by the secondary station; and finally, the time base originally sent to the secondary station is corrected by the primary station based on the checked time base and the time shown by a local clock of the primary station and the corrected time base is sent to the secondary station again by the primary station. When the time base is transmitted between the primary station and the secondary station, two-way comparison is conducted between the primary station and the secondary station to precisely measure transmission delay asymmetry of a transmission loading network, accurately judge and standardize time and frequency synchronization scope of the secondary station, and provide 3G / 4G communication networks withthe high-precision time synchronization method based on the integration of time and frequency, thereby realizing higher-precision time and frequency synchronization.

Description

technical field [0001] The invention belongs to the field of UTC time synchronization, and relates to a UTC high-precision time synchronization method, in particular to a UTC high-precision time synchronization method based on an optical transmission network. Background technique [0002] Coordinated Universal Time, also known as Universal Time, Universal Standard Time, Coordinated International Time, or UTC for short. It comes from English "Coordinated Universal Time" / French "Temps Universel Cordonné". It is a time measurement system that is based on atomic time and seconds and is as close as possible to universal time in terms of time. China adopts ISO 8601-1988 "Data Element and Exchange Format Information Exchange Date and Time Representation" (GB / T 7408-1994), which is called the International Coordinated Time. This time system is used in many Internet and World Wide Web standards, for example, the Network Time Protocol is a way to coordinate universal time on the Int...

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Problems solved by technology

[0012] The purpose of the present invention is to overcome the shortcoming that the existing technology cannot meet the synchronization technology of TD-SCDMA and other 3G and 4G networks, and provide a UTC high-precision time synchronization method based on an optical transmission network. , to provide a high-precision time synchronization method based on time and frequency "fusion" for 3G or 4G communication networks. This method accurately measures the transmission delay asymmetry of the transmission bearer network, and accurately distinguishes and regulates the time and frequency of the slave station Synchronization range, correct automatic delay compensation correction for transmission network delay asymmetry difference

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