Journal of the Korean Society for Railway (한국철도학회논문집)

The Korean Society for Railway (한국철도학회)
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Modeling of Train Radio Propagation Affected by Ground Reflected Wave in High-speed Railway

고속철도 지면반사파를 고려한 열차무선 전파모델

  • Bae, Sung-Ho (Department of Railway Electrical and Signalling Engineering, Seoul National University of Science and Technology) ;
  • Song, Ki-Hong (Dong-Eui Institute of Technology) ;
  • Choi, Kyu-Hyoung (Department of Railway Electrical and Signalling Engineering, Seoul National University of Science and Technology)
  • Received : 2013.08.07
  • Accepted : 2013.10.17
  • Published : 2013.12.31
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Abstract

Radio propagation in a high-speed railway is affected by ground reflective waves that are due to irregular reflection by the railway track, which consists of rails, sleepers, and gravel. This paper provides a train radio propagation model that simulates an irregular track reflective wave as a random variable. A simulation study using the train radio propagation model shows that the path loss exponent is around 3.0, indicating a reduced path loss compared to the value of 4.0 in the general mobile radio environment. Regressive analysis of the received signal strength indicators measured in the Gyeongbu high-speed railway showed the results identical to those of the simulation. These results confirm the train radio propagation model and can be applied to the coverage estimation and the design of a train radio network.

고속철도에서의 열차무선전파는 일반적인 이동통신전파와 달리 레일, 침목 및 자갈로 구성된 철로면 반사에 의해 불규칙적으로 수신되는 지면반사파의 영향을 받는다. 본 논문에서는 이와 같이 불규칙적으로 수신되는 철로면 반사파를 랜덤변수로 모의하고, 여기에 송수신간 직접 경로에 의한 직접파를 추가한 열차무선 전파모델을 제안하였다. 제안한 전파모델을 이용한 시뮬레이션 결과 열차무선에서의 경로손실지수는 3.0으로 분석되어, 일반적인 이동통신환경에서의 4.0에 비해 경로손실이 감소하는 것으로 나타났다. 또한, 고속철도 현장에서의 열차무선 수신전력 측정치에서도 동일하게 경로손실지수가 3.0으로 분석되었다. 이상과 같은 시뮬레이션 및 측정결과로부터, 열차무선 전파모델을 검증하고 경로손실지수를 도출할 수 있었으며, 이 결과는 고속철도 열차무선통신망의 커버리지 예측 및 기지국 설계에 응용할 수 있다.

Keywords

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