一种改进型PTP协议在铁路地面信号设备系统的应用研究

Research of an improved PTP protocol in railway ground signal equipment system

随着列车跨线跨区行驶速度提高,铁路地面信号设备时间统一显得尤为重要。铁路时间同步方法基于NTP协议传输。针对NTP同步技术在传输过程中存在着同步精度低、时间延迟高和稳定性弱的不足,提出一种改进型精准同步协议(PTP)在铁路地面信号设备系统中进行应用。在OPNET仿真下搭建基于3局15站的3层网络拓扑结构的网络模型,在协议层中分别建立改进型PTP协议和NTP协议的子进程模型,通过仿真对同步技术做出对比。研究结果表明:在仿真环境下应用改进型PTP协议同步精度和稳定性有大幅度提高。

With the increase of the cross line speed of the train, the time unification of the railway ground signal equipment is particularly important. At present, the method of the time synchronization of the railway is based on the NTP protocol transmission. In view of the shortcomings of NTP synchronization technology in transmission process, such as low synchronization accuracy, high time delay and weak stability. In this paper, an improved precision synchronous protocol (PTP) was applied in the railway ground signaling equipment system. First, a network model of three-layer network topology based on three bureaus and fifteen stations was built under OPNET simulation. Then the sub process model of the improved PTP protocol and NTP protocol was built in the protocol layer. Finally, synchronization technologies were compared by simulation. The results show that the synchronization precision and stability of the improved PTP protocol are greatly improved under the simulation environment.