基于IEEE1588的高精度时间同步技术分析
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摘要
随着以太网数据传输技术的广泛应用,数据传输速率不断地提升,传统的对时技术难以满足现代通信系统中实时传输的精度需求,网络业界提出了精密时钟同步协议标准(IEEE Standard for a Precision Clock Synchronization Protocol,IEEE1588),该标准采用精密时钟同步协议(Precision Time Protocol,PTP),精度可达微秒级。针对网络传输实时性的需求,阐述了PTP协议原理,通过搭建试验平台测试了在不同网络包长度和不同传输数据率下的PTP性能,分析了非PTP设备对传输精度的影响并进行了修正,将PTP协议在实际网络传输系统中的精度提高到了亚微秒级,为采用PTP协议的对时机制研究提供了参考。
With the extensive use of network transmission,the speed of data transmission increases continually,and the traditional synchronization principles can't satisfy the synchronization precision requirements of advanced communication system.In view of this problem,the network organizations propose "IEEE standard for a precision clock synchronization protocol(IEEE1588)",this standard introduces Precision Time Protocol(PTP),which can make the precision of transmission to achieve the grade of microsecond.Aiming at the requirement of network transmission for real-time performance,the principle of PTP is expatiated.PTP performances are tested on different network packet length and different transmission speeds based on PTP testing platform.The influences of non-PTP devices on transmission precision are analyzed and compensated.The precision of PTP is improved to submircrosecond on actual network transmission.This paper could provide the reference for the study of time synchronization by using PTP.
With the extensive use of network transmission,the speed of data transmission increases continually,and the traditional synchronization principles can't satisfy the synchronization precision requirements of advanced communication system.In view of this problem,the network organizations propose "IEEE standard for a precision clock synchronization protocol(IEEE1588)",this standard introduces Precision Time Protocol(PTP),which can make the precision of transmission to achieve the grade of microsecond.Aiming at the requirement of network transmission for real-time performance,the principle of PTP is expatiated.PTP performances are tested on different network packet length and different transmission speeds based on PTP testing platform.The influences of non-PTP devices on transmission precision are analyzed and compensated.The precision of PTP is improved to submircrosecond on actual network transmission.This paper could provide the reference for the study of time synchronization by using PTP.
引文
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[4] 黄治,陈伟,王向群.IEEE1588在工业以太网交换机中的关键应用[J].现代电子技术,2012,35(23):90-93.
[5] 李智,张景宇,牛军浩,等.基于IEEE1588的时钟同步技术研究[J].仪表技术与传感器,2012(12):99-102.
[6] 王军.IEEE1588与同步以太网技术的研究与实现[D].西安:西安电子科技大学,2016.
[7] 何一航.IEEE1588高精度网络时钟同步研究与实现[D].武汉:华中科技大学,2011.
[8] 马龙华,陈孝良,程晓斌,等.分布式声学测量设备中精确时钟同步研究[J].计算机工程与设计,2011(1):351-353.
[9] 谷士鹏,刘明,支高飞.不同机载测试网络环境对IEEE1588时钟同步系统性能的影响分析[J].计算机测量与控制,2016,24(5):25-27.
[10] 张振,许扬,陆于平,等.IEEE1588协议在分布式系统保护信息传输中应用[J].电力自动化设备,2009(12):83-87.
[11] 刘见,靳绍平,李敏,等.基于IEEE1588协议的高精度时钟对时设计[J].集成电路应用,2014,40(4):48-51.
[12] 梁姣.基于IEEE1588协议的航电以太网时钟同步系统的研究与实现[D].南京:东南大学,2015.
[13] 蔡羽.IEEE1588精密时钟同步协议的研究及其在核心路由器中的实现[D].南京:东南大学,2015.
[14] 孙中尉.IEEE1588高精度网络时间同步应用研究[D].北京:中国科学院,2010.
[15] 杨传顺,李国华,钱幸存.精确时钟协议的最优主时钟算法[J].计算机测量与控制,2011,19(9):2269-2271.
[16] 胡英超.精密时钟同步协议研究与实现[D].哈尔滨:哈尔滨工业大学,2008.