基于NTP的时间同步技术与应用研究  

Research and application of improved time synchronization method based on network time protocol

作　　者：赵兵建[1] 孟天华[1] 王亮[1] 

机构地区：[1]西安交通大学第二附属医院信息网络中心,西安710004

出　　处：《医疗卫生装备》2016年第12期55-60,共6页Chinese Medical Equipment Journal

摘　　要：目的 :解决应用服务器出现时间偏差会导致住院患者每日汇总报表数据不一致、护士看不到医生医嘱及患者的次日用药无法领取等隐患问题。方法:通过深入分析和大量模拟实验,提出一种基于网络时间协议(network time protocol,NTP)的时间同步改进技术,即定时更新NTP服务器硬件时间,以防止NTP服务器因故存在的硬件时钟累积误差问题;同时,采用自动校正NTP服务器冷启动后的系统时间,避免线上的客户机与不正确的时间进行同步。结果:在时间同步微调模式下,采用脚本后的改进技术大大缩短了时间同步。观察10 s的偏差同步时间可节省7 h以上,若时间更长(<600 s),则节省时间更多。结论:缩短了在线设备与NTP服务器的同步时间,解决了极端情况下的时间偏差问题。Objective To solve the problems in case network time protocol （NTP） server may encounter limits in some situations which can cause large time bias. Methods An improved NTP-based time synchronization method developed through analyses and simulation experiments was presented to solve the problem of time bias in extreme situations. Hardware time of the NTP server was refreshed at regular time to eliminate the accumulated error. Meanwhile, adoption of system time after cold startup of auto-corrected NTP server prevented incorrect synchronization of online clients.Results Under time synchronization fine tuning mode, the improved technique using scripts could reduce synchronization time significantly. 10-s observation had the bias synchronization time saved by more than 7 hours. Longer observation time （〈 600 s） resulted in more time saved. Conclusion The synchronization time of online clients to NTP server is decreased, and the time bias problem of extreme situations is solved.

关 键 词：NTP 时间同步 局域网 配置方法 极端情况 优化技术 

分 类 号：TP368.5[自动化与计算机技术—计算机系统结构] R47[自动化与计算机技术—计算机科学与技术]