原子时系统主备钟同步技术研究

主钟系统作为原子时系统的重要组成部分，其运行状态直接关系到整个原子时系统的性能。为了提高系统的可靠性，建立备份主钟系统尤为必要。本文围绕原子时系统中的主备钟同步技术开展相关研究，建立了主备钟同步系统。通过分析原子钟性能，建立钟差模型；并根据钟差模型对备份主钟的频率进行驾驭调整，实现主备钟之间的时间频率一致性。通过调整，原子时系统的主备钟时差可实时保持在1ns以内，频率偏差实时保持在10E-15量级，为原子时系统的主备无缝切换奠定良好基础。

Research on Consistency between Master and Backup Clock in Time-keeping System

Master clock system is an important part of time-keeping system,its operating state is directly related to the performance of time-keeping system.In order to improve reliability,it is very important to establish backup system.In this paper,the methods of maintaining consistency between the master and backup clock is studied,the consistency system is built.The model of clock difference is established through analyzing the characteristic of clock,then the frequency of backup clock is steered,to realize the consistency between master and backup clock.The steering result shows that the masterbackup time difference is keeping in 1 ns,frequency deviation is keeping in 10 E-15 scale.