基于NTP的ORBUS时间同步系统  

ORBUS time synchronization system based on NTP

作　　者：丁永红[1] 徐强[1] 汪芸[1] 

机构地区：[1]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

出　　处：《东南大学学报（自然科学版）》2006年第3期477-482,共6页Journal of Southeast University：Natural Science Edition

基　　金：江苏省普通高校高新技术产业发展资助项目(JH02-074)

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.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.

关 键 词：网络时间协议 ORBUS 时间同步 误差分析 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]