| 时钟同步技术及其在地铁综控系统中的应用 |
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| 引用本文： | 李芳,杨德华,罗存.时钟同步技术及其在地铁综控系统中的应用[J].交通科技与经济,2013(6):6-8,13. |
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| 作者姓名： | 李芳 杨德华 罗存 |
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| 作者单位： | 国电南京自动化股份有限公司,江苏南京210031 |
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| 基金项目： | 国家自然科学基金资助项目（51078306） |
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| 摘 要： | 介绍当前城市地铁综控系统分层、分布式的特点，并指出保持全线站点时钟一致性的重大意义，分析当前世界上主要的GPS和NTP协议对时方式。最后针对地铁综控系统的网络拓扑结构和特点提出NTP协议和GPS相结合的时钟同步方案，测试结果证明这种混合对时方案基本可以满足地铁综合监控系统对时钟同步的要求，具有一定的应用价值。
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| 关 键 词： | 地铁综控系统 网络拓扑 时钟同步 NTP GPS |
Time synchronization and its application to Metro Integrated Control System |
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| LI Fang,YANG De-hua,LUO Cun.Time synchronization and its application to Metro Integrated Control System[J].Technology & Economy in Areas of Communications,2013(6):6-8,13. |
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| Authors: | LI Fang YANG De-hua LUO Cun |
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| Institution: | (Guodian Nanjing Automation Co. ,Ltd, Najing 210031, China) |
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| Abstract: | It first introduces the characteristics of the present city Metro Integrated Control System, which is a hierarchical and distributed system, points out the significance of keeping the clock consistency across all the sites, and then introduces the current world＇s major GPS and NTP protocol. According to the network topology and the characteristics of the Metro Integrated Control System, a clock synchronization scheme is given which uses the NTP protocol based on GPS. Test results show that the hybrid synchronization scheme can meet the subway integrated monitoring system on clock synchronization requirements, and has certain application value. |
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| Keywords: | Metro Integrated Control System network topology clock synchronization NTP GPS |
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