Abstract: To ensure the consistency of physical clocks or logical clocks for the signaling system of suburban railway and improve the reliability of time back-tracking, this paper takes Shanghai Suburban Railway as the research object, provides the background information of Shanghai Suburban Railway, and introduces the current clock synchronization technologies and mainstream signaling clock synchronization schemes. After analysis and summarization, it adopts the advantages of various schemes, proposes a clock synchronization scheme suitable for Shanghai Suburban Railway, and provides a detailed description of various subsystems of the proposed scheme.

Key words: suburban railway, clock synchronization, track-train communication

摘要： 为保障市域铁路信号系统物理时钟或逻辑时钟的一致性，提升时间回溯的可靠性，以上海市域铁路为研究对象，分析目前上海市域铁路的背景，介绍目前现有的时钟同步技术和主流的信号时钟同步方案。通过分析和总结，采纳各方案的优势，提出一套适用于上海市域铁路的时钟同步方案，并对该方案的各子系统进行详细描述。

关键词: 市域铁路, 时钟同步, 车-地通信