Research on the Application of Fiber Optic Synchronization Communication in Tunnel Cable Fault Location System
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 network measurement and control systems such as tunnel cable fault location systems.This synchronization communication method has important engineering practical application value.
NETL
NSTL
万方数据
