基于PTP协议的铁路时间同步网络同步技术研究

由于列车运行速度不断提高,列车的安全问题变得尤为重要。时间同步技术的引入可以帮助铁路各系统通过对时间的监测定位到故障的发生点和各事件的启动顺序。针对铁路系统内部信息传输量大、状态改变快等特点,只有各系统之间实现时间同步,并满足一定的时钟同步精度,从而才能提高系统的联动能力。为了提高铁路系统的时间同步精度,提出精准时间同步协议(PTP)在铁路时间同步网中的应用,并在OPNET仿真中搭建铁路时间同步网网络模型,仿真结果验证了应用PTP协议的铁路时间同步网时间同步精度可达到微妙级。结果表明:应用PTP协议对铁路时间同步网建设和时间同步精度提高起着重要作用。

Research on Synchronization Technology of Railway Time Synchronization Network Based on PTP Protocol

With the continuous improvement of train speed, the safety of trains is becoming more and more important. The introduction of time synchronization technology can help railway systems ascertain fault location and obtain the start-up sequence of events through time monitoring. Because of the large amount of information transmission and fast change of state in railway system, only by realizing time synchronization between different systems and satisfying certain precision of clock synchronization, can the system linkage ability be improved. In order to improve the precision of time synchronization in railway system, this paper presents the application of PTP in railway time synchronization network, and builds a network model of railway time synchronization network in OPNET simulation. The simulation results verify that the precision of railway time synchronization network synchronization using PTP can reach microsecond. The results show that the application of PTP protocol plays an important role in the construction of railway time synchronization network and the improvement of time synchronization accuracy.