A Study on an Impedance Matching Technique for Rail Power Line Communication

레일 전력선통신을 위한 임피던스 정합방안 연구

  • Seo, Ill-Kwon (Graduate School of Transportation, KNUT) ;
  • Ahn, Seung-Ho (Department of Railroad Operation System Engineering, KNUT) ;
  • Kim, Chul-Su (Department of Railway Vehicle System, KNUT)
  • 서일권 (한국교통대 교통대학원) ;
  • 안승호 (한국교통대 철도운전시스템공학과) ;
  • 김철수 (한국교통대 철도차량시스템공학과)
  • Received : 2016.09.29
  • Accepted : 2016.11.10
  • Published : 2016.11.30


An auxiliary real-time train communications system among drivers, train-traffic controllers and field workers is necessary to share hazard information (i.e. rockfall detection, track maintenance) in low visibility zones (long tunnels and steep curved track). To develop the appropriate communication system, this paper proposes a new way of power line communication using the rail track (Rail - PLC), which has little noise and distortion of attenuation. Therefore, it is important to measure the impedance of the rail and to apply an impedance matching technique to increase the transmission characteristic of the Rail - PLC. This study would evaluate the reflection and the transmission characteristics of the rail using a network analyzer and an impedance matching transformer. The suitable impedance matching ratio was 1:3.28 from the result of back-to-back testing. The results confirmed that the transformer can improve the performance of the transmission signal in Rail - PLC using an impedance matching technique.


Impedance;Rail Power Line Communication;Reflection Characteristics;Train Communications System;Transmission Characteristics


Supported by : 국토교통부


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