城市轨道交通信号系统时钟不同步故障分析及优化

Analysis and Optimization of Clock Synchronization Failure in Urban Rail Transit Signal System

阐述了城市轨道交通中信号系统时钟同步的重要性,对信号系统中时钟同步方案进行了说明。对香港和苏州等城市出现的信号系统时钟不同步问题进行了分析,对多个时钟源的精度偏差影响下一层设备时钟同步进行了分析;比较分析了SNTP与NTP时钟同步方案,并分析了两种同步方式的精度偏差。提出了优化信号系统时钟同步方案,在试验环境下对优化方案进行了验证,并将优化的时钟同步方案运用在多个城市,运用效果良好。

The importance of clock synchronization in urban rail transit signal system is elaborated,the design principle of clock synchronization is described.Then,the problems of clock synchronization failure in rail transit signal systems of Hong Kong,Suzhou and other cities are analyzed,the impact of precision deviation that comes from multiple clock sources on the next stratum equipment is discussed.The clock synchronization schemes of SNTP and NTP are compared,the precision deviation of the two synchronization methods is analyzed.On this basis,an optimized clock synchronization scheme of signal system is proposed,which has been verified in experimental environment.The application of the optimized scheme to many cities proves to be successful.