基于双向对比法的光纤时间同步算法研究  

Research on time synchronization algorithm through fiber based on bidirectional contrast method

作　　者：田元 黄剑 张首刚[1] TIAN Yuan;HUANG Jian;ZHANG Shougang(National Time Service Centre,Chinese Academy of Sciences,Xi’an 710600,China;University of Chinese Academy of Sciences,Beijing 100049,China;Xi’an Institute of Space Radio Technology,Xi’an 710018,China)

机构地区：[1]中国科学院国家授时中心,陕西西安710600 [2]中国科学院大学,北京100049 [3]西安空间无线电技术研究所,陕西西安710018

出　　处：《电子设计工程》2023年第11期173-176,共4页Electronic Design Engineering

摘　　要：时钟同步是光纤时间传递的重要部分,时钟偏差与时钟漂移的测量精度直接关系到本地端与远程端的时钟同步精度,进而影响光纤时间传递的时间信号传递精度。为了提高光纤授时双向比对法的授时精度,通过卡尔曼滤波算法,对整个过程进行数学建模,将远程端与本地端的时钟钟差、时钟漂移以及时钟漂移变化率全部考虑进来,通过赋予观测值与预测值不同的权重进而得出相对更加准确的时钟偏差,并且不断迭代修正模型。建立了预测模型和观测模型,并进行了仿真实验。通过仿真设计实验,验证了卡曼滤波算法在光纤时间传递中的作用效果,将1.5 ns的时钟偏差优化到最大不超过0.5 ns。Clock synchronization is an important part of optical fiber time transfer.The measurement accuracy of clock deviation and clock drift is directly related to the clock synchronization accuracy of the local clock and the remote clock.And it affects the time signal transfer accuracy of optical fiber time transfer.In order to improve the timing accuracy of the optical fiber timing two⁃way comparison method,this paper uses the Kalman filter algorithm to mathematically model the whole process.By assigning different weights to the observed value and the predicted value,a relatively more accurate clock bias is obtained,and the model is iteratively revised.The prediction models and observation models are established,and simulation experiments are conducted.Through the simulation design experiment,the effect of the Kalman filter algorithm in the optical fiber time transfer is verified.It can optimize clock skew of 1.5 ns to less than 0.5 ns.

关 键 词：卡尔曼滤波 光纤授时 时间同步 双向比对法 

分 类 号：TN29[电子电信—物理电子学]