基于滑模控制的IEEE1588时钟同步算法研究  

Research on IEEE1588 clock synchronization algorithm based on sliding mode control

作　　者：程铁栋 陶征亮 易其文 尹宝勇 袁海平[2] Cheng Tiedong;Tao Zhengliang;Yi Qiwen;Yin Baoyong;Yuan Haiping(School of Electrical Engineering and Automation,Jiangxi University of Science and Technology,Ganzhou 341000,China;School of Civil and Hydraulic Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]江西理工大学电气工程与自动化学院,赣州341000 [2]合肥工业大学土木与水利工程学院,合肥230009

出　　处：《电子测量与仪器学报》2021年第8期46-52,共7页Journal of Electronic Measurement and Instrumentation

基　　金：国家自然科学基金项目(51874112);江西省科技厅重点研发项目(20192BBEL50042);江西理工大学研究生创新专项资金项目(ZS2020-S060)资助。

摘　　要：针对IEEE1588时钟同步过程中存在时钟频率漂移问题,提出了一种基于滑模控制的新型时钟同步算法。首先根据主从时钟偏差与漂移的递推关系,建立系统状态空间模型;然后运用滑模控制缩小时钟偏差与时钟漂移;最后结合滑动平均滤波对实验过程中的频率抖动和随机误差进行优化。结果表明,基于滑模控制的时钟同步算法可有效抑制时钟漂移引起的时钟偏差线性增长,将时钟偏差控制在1μs以下,从而实现亚微秒级网络对时。相比传统IEEE1588协议同步方法,所提方法提供了更高的同步精度。Aiming at the problem of clock frequency drift in IEEE1588 clock synchronization process,a novel clock synchronization algorithm based on sliding mode control is proposed.Firstly,the state space model of the system is established according to the recurrence relationship between master-slave clock offset and drift.Then,the sliding mode control is used to reduce the clock skew and clock drift.Finally,the frequency jitter and random error in the experimental process are optimized by sliding average filter.The results show that the clock synchronization algorithm based on sliding mode control can effectively restrain the linear growth of clock skew caused by clock drift,and control the clock skew below 1μs,thus,realizing sub microsecond network time synchronization.Compared with the traditional IEEE1588 protocol synchronization method,the proposed method provides higher synchronization accuracy.

关 键 词：IEEE1588 时钟偏差 时钟漂移 滑模控制 滑动平均滤波 

分 类 号：TP274.2[自动化与计算机技术—检测技术与自动化装置]