A new ground-to-train communication system using free-space optics technology

H. Kotake, T. Matsuzawa, A. Shimura, S. Haruyama, M. Nakagawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)

Abstract

We propose a new ground-to-train communication system using free-space optics between a train and the ground. In the proposed system, a cylindrical concave lens spreads the incoming beam from transmitter (Laser Diode, LD) horizontally to form a wide fan-shaped beam. The fan-shaped beam is projected to a train and the width of the projected beam is equal to the length of a typical bullet-train car. This transmitter with cylindrical concave lens and a receiver (Avalanche Photo Diode, APD) are installed on a train and the ground, and the horizontally spread beam is received continuously by the corresponding receiver. The train can keep a communication link continuously to the ground thanks to this spread beam. We analyzed the performance of the proposed system by experiments. The experimental results show that a sufficient received Signal-to-Noise Ratio (SNR) can be obtained when a train is not moving; therefore, the signal can be received continuously even when the train is moving. Furthermore, in order to keep a continuous communication link even when the train vibrates or shifts vertically, the vertical spread angle of a laser beam is adjusted between 0.1 degrees and 0.5 degrees. These experimental results lead to the conclusion that this system is expected to be a Giga-bit class high speed communication technology between the train and the ground.

Original languageEnglish
Title of host publicationComputers in Railways X
Subtitle of host publicationComputer System Design and Operation in the Railway and Other Transit Systems
Pages683-692
Number of pages10
DOIs
Publication statusPublished - 2006 Dec 1
Event10th International Conference on Computer System Design and Operation in the Railway and Other Transit Systems, COMPRAIL 2006, CR06 - Prague, Czech Republic
Duration: 2006 Jul 102006 Jul 12

Publication series

NameWIT Transactions on the Built Environment
Volume88
ISSN (Print)1743-3509

Other

Other10th International Conference on Computer System Design and Operation in the Railway and Other Transit Systems, COMPRAIL 2006, CR06
CountryCzech Republic
CityPrague
Period06/7/1006/7/12

    Fingerprint

Keywords

  • Horizontally spread beam
  • Optical wireless communication
  • Train communication
  • Visible light communication

ASJC Scopus subject areas

  • Architecture
  • Civil and Structural Engineering
  • Building and Construction
  • Automotive Engineering
  • Safety, Risk, Reliability and Quality
  • Arts and Humanities (miscellaneous)
  • Transportation
  • Safety Research
  • Computer Science Applications

Cite this

Kotake, H., Matsuzawa, T., Shimura, A., Haruyama, S., & Nakagawa, M. (2006). A new ground-to-train communication system using free-space optics technology. In Computers in Railways X: Computer System Design and Operation in the Railway and Other Transit Systems (pp. 683-692). (WIT Transactions on the Built Environment; Vol. 88). https://doi.org/10.2495/CR060671