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Nanosecond time synchronization method between fixed network nodes and implementation device

A time synchronization and fixed network technology, applied in time division multiplexing systems, radio transmission systems, electrical components, etc., to achieve high-precision time synchronization, simple equipment composition, and consistent time

Pending Publication Date: 2021-11-09
NO 20 RES INST OF CHINA ELECTRONICS TECH GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the deficiencies of the prior art, the present invention provides a nanosecond-level time synchronization method and implementation device between fixed network nodes, which solves the problem of real-time high-precision synchronization of time signals in different places, and achieves a time synchronization accuracy of 5 nanoseconds

Method used

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  • Nanosecond time synchronization method between fixed network nodes and implementation device
  • Nanosecond time synchronization method between fixed network nodes and implementation device
  • Nanosecond time synchronization method between fixed network nodes and implementation device

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Experimental program
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Effect test

Embodiment

[0056] a) On the time base module, use the 1PPS signal output by the Beidou receiving module to perform time taming to obtain the local clock;

[0057] On the time base module, use the BD 1PPS signal provided by the Beidou receiving module once per second to perform time taming processing. Time taming uses a digital frequency control phase-locked loop to measure the phase difference between the rubidium clock module and the external input BD1PPS at a frequency of 1s. , remove the phase difference value whose jitter is greater than ±20ns, and perform a sliding average with a length of m. Jitter, obtain high and stable 1PPS synchronized with BD 1PPS, and get local clock T after time control module adjustment A , the first adjustment amount of the time control module is zero when starting up;

[0058] b) Measure the time difference between the Beidou receiving module output 1PPS and the local clock on the time base module;

[0059] Measure the Beidou receiving module output BD ...

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Abstract

The invention provides a nanosecond time synchronization method between fixed network nodes and an implementation device, and the method comprises the steps: building a local clock reference with the time tamed to a satellite in a fixed network time frequency synchronization device, and estimating the time difference of a local clock between a slave station and a master station through a satellite common-view method; and then, the time of the slave station by using a phase-level time control method, so that the time of the slave station is synchronized with the time of the master station; and finally, achieving whole-network time synchronization within a range covering 500 kilometers. Real-time high-precision time synchronization of two remote nodes of the slave station and the master station is realized, so time synchronization of the whole fixed network is realized, the precision can reach 5ns, equipment composition is simple and practical, the method is suitable for engineering application in an external field environment, time synchronization and following of the slave station and the master station in the network nodes are realized, time of the whole network is consistent, real-time performance and practicability needed by practical engineering application are achieved, and nanosecond-level time synchronization precision of the slave station and the master station is achieved.

Description

technical field [0001] The present invention relates to the field of time synchronization. In particular, a time synchronization method and device between network nodes, mainly for high-precision time synchronization required by multi-node distributed electronic information systems, especially a real-time high-precision synchronization method for time signals with 5 nanosecond precision between fixed network nodes . Background technique [0002] In the multi-node distributed electronic information system for fixed applications, the time synchronization accuracy of the entire network is required to be 5 nanoseconds, which is the basis for realizing signal-level and data-level data fusion. [0003] In existing platform applications such as vehicles, ships, and fixed facilities, the navigation system terminal is used to obtain the standard time synchronized with UTC. For example, the timing accuracy of satellite navigation is 50 ns, so that the time difference between two remo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J3/06H04B7/185
CPCH04J3/0617H04J3/0676H04B7/1851
Inventor 杨文辉彭伟杨哲林毅韩钊郭凤娟
Owner NO 20 RES INST OF CHINA ELECTRONICS TECH GRP
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