光纤对时通信在隧道电缆故障定位系统中的应用研究  

Research on the Application of Fiber Optic Synchronization Communication in Tunnel Cable Fault Location System

作　　者：刘培新 LIU Peixin(China Railway Construction Electrification Bureau Group Co.Ltd.,Beijing 100043,China)

机构地区：[1]中国铁建电气化局集团有限公司,北京100043

出　　处：《铁道建筑技术》2024年第8期59-62,共4页Railway Construction Technology

基　　金：中国铁建股份有限公司科技研发计划项目(2019-B11)。

摘　　要：介绍一种隧道内高精度以太网络光纤对时通信方法,旨在解决隧道内电缆故障定位装置无法直接接收卫星信号的问题。该方法可使隧道内故障定位装置能够无需外界辅助信号即可保持高精度时钟,通过先进算法和硬件设备,使隧道内时钟精度与隧道外装置同步,时钟误差控制在100 ns以内,满足了隧道内电缆故障定位装置对时钟精度极高的应用需求。对几种对时通信方法进行分析对比,包括编码、脉冲、串口和以太网络光纤对时同步方式。其中,编码同步和脉冲同步受传输距离影响很大;串口同步方式受波特率影响较大。通过以太网络光纤对时同步方式进行节点间时钟同步能够有效解决距离因素带来的限制,能够满足隧道内故障定位系统时钟同步通信要求。另对装置硬件研发进行阐述,其中时钟同步控制模块采用IEEE 1588时钟同步协议,以太网络光纤对时通信基于IEEE 1588时钟同步协议进行时钟同步。对以太网络光纤对时通信方法的有效性进行试验验证,结果显示,时间误差均小于100 ns,可完全满足隧道内故障定位功能要求。采用以太网络光纤对时通信方法完全能够满足隧道电缆故障定位系统等分布式网络测控系统的时钟同步精度要求,具有重要的工程实际应用价值。This article introduces a high-precision Ethernet fiber optic synchronization communication method in tunnels,aiming to solve the problem of cable fault positioning devices in tunnels being unable to directly receive satellite signals.This method enables the fault location device inside the tunnel to maintain high-precision clock without the need for external auxiliary signals.Through advanced algorithms and hardware equipment,the clock accuracy of the device inside the tunnel is synchronized with that of the device outside the tunnel,and the clock error is controlled within 100 ns,meeting the extremely high application requirements of the cable fault location device inside the tunnel for clock accuracy.This article analyzes and compares several time synchronization communication methods,including encoding,pulse,serial port,and Ethernet fiber synchronization methods.Among them,encoding synchronization and pulse synchronization are greatly affected by transmission distance.The serial port synchronization method is greatly affected by the baud rate.The clock synchronization between nodes through Ethernet fiber optic synchronization can effectively solve the limitations caused by distance factors and meet the requirements of clock synchronization communication in tunnel fault location systems.This article also introduces the hardware development part of the device,in which the clock synchronization control module adopts the IEEE 1588 clock synchronization protocol,and the Ethernet fiber optic synchronization communication is based on the IEEE 1588 clock synchronization protocol for clock synchronization.This article verifies the effectiveness of the Ethernet fiber optic synchronization communication method through experiments.The experimental results show that the time error is less than 100 ns,which can fully meet the requirements of fault location function in the tunnel.The use of Ethernet fiber optic synchronization communication method can fully meet the clock synchronization accuracy requirements of distributed

关 键 词：隧道电缆 光纤对时 通信 故障定位 

分 类 号：U453.7[建筑科学—桥梁与隧道工程]