基于IEEE1588协议的精确时钟同步算法改进  

Improvement of the time synchronization algorithm based on IEEE1588

作　　者：刘建成 

机构地区：[1]朗讯科技光网络有限公司上海研发中心,上海201206

出　　处：《电子设计工程》2015年第4期105-107,共3页Electronic Design Engineering

摘　　要：本文详细分析了IEEE1588时钟同步的基本原理,并在此基础上给出一种改进的时间同步方法。该改进的时钟同步算法针对网络传输路径的不对称性引入加权因子,用一定时间窗内的主从时钟偏差样本的算术平均值而不是直接利用主从时钟偏差来调整从时钟,并根据算法的状态改变时间窗N的大小,同时利用方差阈值滤波的方法过滤跳变过大时钟偏差测量值,保证同步算法的稳定性。最后给出Alcatel-Lucent TSS5R系统在实验室的时间性能实验结果。实验结果表明TSS5R时钟同步具有稳定的性能,同步精度达到亚微秒级,可满足PTN产品高精度时钟同步的要求。We present an improved time synchronization algorithm based on a detailed introduction of IEEE1588 clock synchronization theory. The improved time synchronization algorithm introduce a weight coefficient for asymmetry in the propagation paths, use mean clock offset between a slave and a mater clock during time window N which is adjustable instead of raw offset to adjust slave clock, has variance threshold filter filtering vastly noise. Finally, we demonstrate the experiment of the timing performance for Alcatel-Lucent TSS5 R system. The experiment result shows that the IEEE1588 clock of TSS5 R is stable and it is sub-microsecond accuracy which can meet the requirement of high accuracy clock synchronization for PTN.

关 键 词：时间同步 精确时间协议 IEEE1588 时间戳 

分 类 号：TN801[电子电信—信息与通信工程]