基于自回归算法的测控网络时钟同步设计
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摘要
为了提高测控网络的时钟同步精度,在现有IEEE 1588协议的网络时钟基础上,提出基于自回归算法的时钟同步设计。通过建立自回归时钟漂移模型,利用一阶卡尔曼滤波器对主从时钟的时钟偏差和漂移进行估计,根据估计值对时钟进行补偿和修正,并在测控网络失去最高主时钟信号的情况下,预测时钟漂移量以维持主从时钟同步。试验结果表明,该设计能有效降低时间戳获取精度对时钟同步的影响,使同步精度达到10 ns,并提高了系统在离线状态下的同步可靠性。
On the basis of the network clock conforming IEEE 1588 protocol,the clock synchronization design based on autoregression algorithm is proposed to improve the clock synchronization precision of the measurement and control network. By establishing the autoregression clock offset model,the one-order Kalman filter is used to estimate the clock offset and drift of the master-slave clock. According to the estimation value,the clock is compensated and corrected,and the clock drift is predicted to maintain the synchronization of master-slave clock when the highest signal of master clock is lost in the measurement and control network. The experimental results show that the design can effectively reduce the influence of timestamp acquisition accuracy on clock synchronization,make the clock synchronization accuracy reach up to 10 ns,and improve the system synchronization reliability at offline state.
On the basis of the network clock conforming IEEE 1588 protocol,the clock synchronization design based on autoregression algorithm is proposed to improve the clock synchronization precision of the measurement and control network. By establishing the autoregression clock offset model,the one-order Kalman filter is used to estimate the clock offset and drift of the master-slave clock. According to the estimation value,the clock is compensated and corrected,and the clock drift is predicted to maintain the synchronization of master-slave clock when the highest signal of master clock is lost in the measurement and control network. The experimental results show that the design can effectively reduce the influence of timestamp acquisition accuracy on clock synchronization,make the clock synchronization accuracy reach up to 10 ns,and improve the system synchronization reliability at offline state.
引文
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[2]陈希,滕玲,高强,等.NTP和PTP协议的时间同步误差分析[J].宇航计测技术,2016,36(3):35-40.CHEN Xi,TENG Ling,GAO Qiang,et al.Error analysis of time synchronization in NTP and PTP[J].Journal of astronautic metrology and measurement,2016,36(3):35-40.
[3]崔全胜,白晓民,黄毕尧,等.P2P透明时钟驻留时间误差测试方法及其在时钟测试仪上的实现[J].电网技术,2016,41(1):322-327.CUI Quansheng,BAI Xiaomin,HUANG Biyao,et al.Test method for the resident time error of P2P transparent clock and its implementation on the clock tester[J].Power system technology,2016,41(1):322-327.
[4]AUGUSTO Ciuffoletti.Preventing the collision of requests from slave clocks in the precision time protocol(PTP)[J].IEEE transactions on instrumentation and measurement,2011,60(6):2096-2103.
[5]陈金凤.IEEE 1588网络时延测量研究与实现[D].西安:中国科学院国家授时中心,2013.CHEN Jinfeng.Research and implement of IEEE 1588 network delay measurement[D].Xi’an:National Time Service Center,Chinese Academy of Sciences,2013.
[6]陈金凤,华宇,孙中尉.IEEE 1588v2透明时钟研究与实现[J].宇航计测技术,2013,33(3):11-16.CHEN Jinfeng,HUA Yu,SUN Zhongwei.Research and implement of transparent clock based on IEEE 1588v2[J].Journal of astronautic metrology and measurement,2013,33(3):11-16.
[7]李学桥,陈园,梁爽.基于IEEE 1588协议的精确时钟同步算法改进[J].计算机工程与科学,2011,33(2):42-45.LI Xueqiao,CHEN Yuan,LIANG Shuang.Improvement of the precise time synchronization algorithm based on IEEE 1588[J].Computer engineering&science,2011,33(2):42-45.
[8]庄晓燕,王厚军.基于卡尔曼滤波的IEEE 1588时钟同步算法[J].电子测量与仪器学报,2012,26(9):747-751.ZHUANG Xiaoyan,WANG Houjun.IEEE 1588 clock synchronization algorithm based on Kalman filter[J].Journal of electronic measurement and instrument,2012,26(9):747-751.
[9]刘伟,彭雷,张朕滔,等.基于IEEE 1588协议电力监控系统的对时算法改进[J].重庆理工大学学报(自然科学),2016,30(10):135-140.LIU Wei,PENG Lei,ZHANG Zhentao,et al.Synchronization algorithm modification of power supervisory system based on IEEE 1588 protocol[J].Journal of Chongqing University of Technology(nature science),2016,30(10):135-140.
[10]TOURNIER J C,YIN Xiao.Improving reliability of IEEE1588 in electric substation automation[C]//2008 International IEEE Symposium on Precision Clock.Michigan:IEEE,2008:65-70.
[11]陈金凤,华宇,孙中尉.基于IEEE 1588频率漂移补偿算法研究与实现[J].时间频率学报,2013,36(3):141-147.CHEN Jinfeng,HUA Yu,SUN Zhongwei.Implementation and study of frequency drift compensation based on IEEE 1588[J].Journal of time and frequency,2013,36(3):141-147.