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High-precision multi-station fiber time synchronization method

A high-precision synchronization and time synchronization technology, applied in optical fiber transmission, multiplexing communication, time-division multiplexing systems, etc., can solve problems such as failures in the operation process, complicated operations, and high costs, and achieve the goal of increasing or decreasing the number, There is no effect of cumulative error

Active Publication Date: 2017-04-26
NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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Problems solved by technology

Existing methods for optical fiber time synchronization between distributed multi-sites are mostly based on the scheme of simultaneous or time-sharing bidirectional time comparison between each receiving site and the source transmitting station. These schemes require each site to have lasers and detectors, and The source end station needs to perform complex regulation on each station, which not only costs high, but also complicates the operation, and the probability of failure in the operation process increases

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  • High-precision multi-station fiber time synchronization method

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Embodiment Construction

[0037] The high-precision multi-site optical fiber time synchronization method of the present invention includes two simultaneous processes: 1) two-way time comparison between the source transmitting station and the terminal receiving station, and 2) synchronous time signal regeneration at the receiving stations along the way. Specifically:

[0038] 1) The two-way time comparison process between the source transmitting station and the terminal receiving station consists of the following steps:

[0039] 1.1) Real-time measurement and calculation of real-time delay value of optical fiber link

[0040] The source transmitting station and the end receiving station continuously exchange time signals, and calculate the real-time delay value of the optical fiber link according to the comparison results;

[0041] 1.2) The source transmitter station performs pre-compensation; this step is specifically:

[0042] According to the real-time delay value of the optical fiber link obtained...

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Abstract

The invention discloses a high-precision multi-station fiber time synchronization method, and the method comprises the steps that 1), a source end transmitting station and a tail end receiving station carry out the bidirectional time comparison; 2), receiving stations along a way regenerates synchronized time signals. The above two processes are carried out at the same time. According to the invention, the source end transmitting station and the tail end receiving station just need to carry out the continuous bidirectional time comparison, and the receiving stations along a way just receive bidirectional time comparison signals from the source end transmitting station and the tail end receiving station, regenerate the time signals synchronous with the source end transmitting station, and do not need to participate in the bidirectional time comparison. The method can achieve the same synchronization precision and reliability of multi-station fiber time synchronization and point-to-point fiber time synchronization, and the receiving stations along the way do not interfere with each other, wherein the number can change flexibly.

Description

technical field [0001] The invention belongs to the technical field of optical fiber time service synchronization and relates to multi-site optical fiber time synchronization, in particular to a high-precision multi-site optical fiber time synchronization method. Background technique [0002] In fields such as aerospace, radar synchronization, cutting-edge weapon control, high-speed communication, and deep space exploration, high requirements are placed on time synchronization. The current long-wave timing can only achieve synchronization accuracy of microseconds, satellite common viewing can only achieve synchronization accuracy of nanosecond level, and even the expensive satellite two-way comparison method can only achieve synchronization accuracy of hundreds of picoseconds. The optical fiber time synchronization method can achieve a synchronization accuracy of one hundred picoseconds, and the equipment price is much lower than the satellite two-way comparison method, so t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J3/06H04B10/25
CPCH04B10/2589H04J3/0638
Inventor 陈法喜赵侃刘涛张首刚周旭
Owner NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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