[1]丁永红,徐强,汪芸.基于NTP的ORBUS时间同步系统[J].东南大学学报(自然科学版),2006,36(3):477-482.[doi:10.3969/j.issn.1001-0505.2006.03.030]
 Ding Yonghong,Xu Qiang,Wang Yun.ORBUS time synchronization system based on NTP[J].Journal of Southeast University (Natural Science Edition),2006,36(3):477-482.[doi:10.3969/j.issn.1001-0505.2006.03.030]
点击复制

基于NTP的ORBUS时间同步系统()
分享到:

《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
36
期数:
2006年第3期
页码:
477-482
栏目:
计算机科学与工程
出版日期:
2006-05-20

文章信息/Info

Title:
ORBUS time synchronization system based on NTP
作者:
丁永红 徐强 汪芸
东南大学计算机网络和信息集成教育部重点实验室, 南京 210096
Author(s):
Ding Yonghong Xu Qiang Wang Yun
Key Laboratory of Computer Network and Information Integration of Ministry of Education, Southeast University, Nanjing 210096, China
关键词:
网络时间协议 ORBUS 时间同步 误差分析
Keywords:
network time protocol ORBUS time synchronization analysis of errors
分类号:
TP393
DOI:
10.3969/j.issn.1001-0505.2006.03.030
摘要:
为了提供大范围跨网段的高精度时间同步,采用NTP协议的思想和统计方法,提出了基于NTP的ORBUS时间同步系统模型,实现了原型系统,并对同步误差进行了理论分析.跨网段的实际测试表明:该系统时间偏移量正负向平均值为-3.5和3.3 ms,网络延迟10 ms左右,而普通时间偏移量正负向平均值为-5.3和5.4 ms,网络延迟波动很大,甚至超过95 ms.验证了基于NTP的时间同步较普通同步的性能提高.该系统的总误差控制在100 ms以内,可以为大规模分布对象系统提供时间同步.
Abstract:
To provide large-scaled cross-subnet time synchronization with high precision, network time protocol(NTP)based time synchronization system is proposed and implemented by using NTP and statistical method, and detailed error analysis is made. Cross-subnet experiments indicate that in this scheme the average positive offset and average negative offset are -3.5 and 3.3 ms, respectively, and network time delay is 10 ms. In contrast in normal scheme the average positive offset and average negative offset are -5.3 and 5.4 ms, respectively, and network time delay may exceed even 95 ms. Therefore improved performance over the normal scheme is confirmed. Because the system error can be controlled within 100 ms, this system is capable of providing precise and stable time synchronization for large-scaled distributed systems.

参考文献/References:

[1] Lamport L.Time,clocks,and the ordering of events in a distributed system[J]. Commun ACM,1978,21(7):558-565.
[2] Cristian F.A probabilistic approach to distributed clock synchronization[C] // Proceedings of the 9th IEEE International Conference on Distributed Computing Systems. Newport Beach,CA,1989:288-296.
[3] 朱海滨.分布式系统原理与设计[M].长沙:国防科技大学出版社,1997.
[4] Mills D L.Internet time synchronization:the network time protocol[J]. IEEE Transactions on Communications,1991,39(10):1482-1493.
[5] Mills D L.Adaptive hybrid clock discipline algorithm for the network time protocol networking[J].IEEE/ACM Transactions on Networking,1998,6(5):505-514.
[6] Mills D L.A brief history of NTP time:memoirs of an Internet timekeeper[J]. ACM SIGCOMM Computer Communication Review,2003, 33(2):9-21.
[7] Mills D L.Network time protocol(version 3)specification,implementation and analysis[R].Network Working Group Report RFC 1305,University of Delaware,1992.
[8] Mills D L.Network time synchronization project[EB/OL].(2005)[2005-10-10].http://www.eecis.udel.edu/~mills/ntp.html.
[9] 包秀国,胡铭曾,张宏莉.一种自组织时间同步网[J].通信学报,2004,25(1):150-156.
  Bao Xiuguo,Hu Mingceng,Zhang Hongli.A self-organizing time synchronization network[J].Journal on Communications,2004,25(1):150-156.(in Chinese)
[10] Omer G,Israel C,Moshe S.Network time synchronization using clock offset optimization[C] //Proceedings of the 11th IEEE International Conference on Network Protocols.Atlanta,GA,USA,2003:212-221.

备注/Memo

备注/Memo:
基金项目: 江苏省普通高校高新技术产业发展资助项目(JH02-074).
作者简介: 丁永红(1975—),男,硕士生; 汪芸(联系人),女,博士,教授,yunwang@seu.edu.cn.
更新日期/Last Update: 2006-05-20