光纤时间传递系统中时钟驯服模块的设计和实现

提出了一种基于光纤时间传递系统的时钟驯服模块设计方案。介绍了系统硬件的组成。在对信道特性和压控晶振进行理论和实验分析的基础上，设计实现了适用于光纤信道特性的卡尔曼滤波算法以及驯服流程控制程序。实验测试表明：该模块能结合恒温晶振短期稳定度好和光纤时间传递系统秒脉冲长期稳定度好的优点，时间传递的精度优于0．25ns（1σ），输出的秒脉冲的长期稳定度优于10^-14。

Design and realization of a disciplined clock module used in time transfer system with optical fiber

A design approach of disciplined clock module used in time transfer system with optical fiber is presented and the hardware system is introduced. On the basis of analyzing the transfer characteristic of optical fiber and the VCXO（voltage controlled crystal oscillator） theoretically and experimentally, a time disciplined program with kalman filtering algorithm has been developed, which is suitable for optical fiber channel. The tests show that the disciplined clock model can take the advantages from the oscillator with good short-term stability and from the optical time transfer system with good long-term stability, and the time-transfer precision and the long-term stability of output 1 PPS are better than 0.25 ns （ 1σ ） and better than 10-14 respectively.