欧洲应答器编码策略的安全性研究

应答器信息在车-地间进行无线传输过程中的安全可靠性对于保障列控系统的安全十分重要。我国列车控制系统(CTCS)已将应答器作为CTCS-1及以上级别系统的关键设备,用于向运行列车传输列控安全信息。本文分析了应答器信息在传输和接收过程中可能存在的随机突发错误、异步传输错误、长短帧报文误译及报文切换时错译等各种错误模式。为保证信息传输和接收过程的安全可靠性,研究了欧洲应答器编码策略中采用的CRC循环冗余码及同步信息码校验、10到11 bit字转换、整形约束条件检查等防护措施在编、译码过程中对以上错误模式的防范能力,从理论上论证得到:欧洲应答器编码策略有效保证了应答器信息在传输和接收过程中的安全性,对于我国研制适用于CTCS的应答器具有借鉴作用。

Research on the Safety of Eurobalise Coding Strategy

The safety of balise information during the transmission process between the ground and the train is very important for the safety of train control system.Balise transmits safe information to running trains.China Train Control System takes balise as essential equipments for CTCS-2 and CTCS-3.This paper has analyzed the potential error modes of balise information during the transmission and receiving process,such as random errors,asynchronous transfer errors,miscoding between long message and short message,miscoding when a message switchs to another.In order to ensure the safety and reliability during the transmission and receiving process,this paper has also studied protection measurements in coding and encoding process,such as cyclic redundancy code check,conversion from 10 bits character to 11 bits character,related constraints inspection.Theoretical analyses verify the safety of balise information during the transmission and receiving process.This is helpful for China to develop balise suitable to CTCS.