列车全自动运行信号系统时间同步方案
黄柒光梁宇
Time Synchronization Scheme for Train FAO Signaling System
HUANG QiguangLIANG Yu
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作者信息:卡斯柯信号有限公司， 200072， 上海
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Affiliation:CASCO Signal Ltd., 200072, Shanghai, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.02.038
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中图分类号/CLCN:U285
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栏目/Col:应用技术
摘要:
［目的］时间同步是保证信号系统中各子系统协同联动的基础，其直接关系到列车的运营准点率和运行安全性，也是实现列车全自动驾驶的基础。因此，需对列车全自动运行信号系统的同步方案进行研究。［方法］介绍了时间同步设备在信号系统中的作用；提出一种信号系统时间同步方案，并对所提信号系统时间同步方案进行了说明。［结果及结论］所提时间同步方案为：信号系统的通信前置机通过网络从时钟系统获取统一时间源，且仅由通信前置机的主机提供时间服务；应用服务器作为客户端同步通信前置机的主机，且仅应用服务器主机作为服务端，为下一层设备提供时间服务；网关服务器和各终端设备同步应用服务器主机的时间，网关服务器主机作为时钟源为下一层设备提供时间服务；ATC(列车自动控制)车载设备和DCS(数据通信子系统)设备作为客户端，同步网关服务器主机的时间。所提方案对信号系统内部与外部采用不同的同步方式，避免外部时钟跳变导致内部信号系统跳变，确保了设备的时间同步精度，其时间同步精度可达毫秒级，保障了列车全自动运行的需求。
Abstracts:
［Objective］ Time synchronization is the foundation for ensuring the coordinated linkage of sub-systems within the signaling system, which directly affects the punctuality and operational safety of trains, serving as the basis for achieving train FAO (fully automatic operation). Therefore, it is necessary to study the train FAO signaling system synchronization scheme. ［Method］ The role of time synchronization devices in the signaling system is introduced. A time synchronization scheme is proposed and explanation is provided for the scheme. ［Result & Conclusion］ The proposed time synchronization scheme is as follows: the communication front-end processer of the signaling system obtains a unified time source from the clock system through the network, and time services are provided only by the host of the communication front-end processer. The application server as the host of client synchronizing with the communication front-end processer, and only the application server host is used as the server to provide time services to the lower-level devices. The gateway server and various terminal devices synchronize with the time of the application server host, with the gateway server host serving as the clock source to provide time services to the lower-level devices. The ATC (automatic train control) on-board devices and DCS (data communication sub-system) devices serve as clients to synchronize the gateway server host time. The proposed scheme utilizes different synchronization methods for the internal and external environments of the signaling system, avoiding internal signaling system jumps caused by external clock jumps, ensuring the time synchronization accuracy of the equipment. The time synchronization accuracy can reach millisecond level, thereby guaranteeing the requirements for train FAO.
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