基于路径加权反馈的工业环网时钟同步方法  

Industrial ring network time synchronization based on waydelay weighted feedback algorithm

作　　者：章涵[1] 冯冬芹[1] 褚健[1] 

机构地区：[1]浙江大学先进控制研究所,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2010年第5期849-853,共5页Journal of Zhejiang University：Engineering Science

基　　金：国家创新研究群体科学基金资助项目(60721062);国家"863"高技术研究发展计划资助项目(2006AA040301;2007AA041301)

摘　　要：为了实现大规模环形网络系统中所有结点的高精度时钟同步,根据环形链路存在物理环路的特点,通过环形链路中的备用链路,由主时钟进行累积同步偏差反馈.基于该累积同步偏差和所有设备间时钟同步数据帧在环网中的传输时延,对累积偏差进行路径加权反馈,实现系统中所有时钟的偏差补偿,提高其同步精度,从而实现大规模工业环形网络的高精度时钟同步.在分析单跳同步偏差以及边界时钟累积同步偏差的基础上,得出基于路径加权反馈后所有设备的同步偏差,理论证明了该算法的有效性.进一步通过实验验证,该算法显著提高了环形网络时钟同步精度.The backup link in ring topology was used as feedback path according to the characteristic of the physical link in order to satisfy the requirement of high precise time synchronization in large scale industrial network. The accumulated offset was feedbacked to all devices in the ring network by master device. Based on the accumulated offset and the delay of synchronization frames between each device in the ring network,the path weighted feedback algorithm was introduced to improve the precision of synchronization of each slave device with offset compensation. Then the high precise time synchronization of large scale industrial ring network was achieved. The offset of each device was calculated using waydelay weighted feedback algorithm based on the offset of one-jump synchronization and the accumulated offset of boundary clock algorithm. The theoretical analysis and experimental results show that the algorithm can achieve higher precise time synchronization in industrial ring network.

关 键 词：工业以太网 时钟同步 环形网络 加权反馈 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]