A New Ground-to-Train Communication System Using Free-Space Optics Technology
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- Kotake Hideaki
- Department of Infomation and Computer Science, Keio University
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- Haruyama Shinichiro
- Department of Infomation and Computer Science, Keio University
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- Nakagawa Masao
- Department of Infomation and Computer Science, Keio University
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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 at a train and the ground, and the horizontally spread beam is received continuously by 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 as a Giga-bit class high speed communication technology between the train and the ground.
Journal
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- IEEJ Transactions on Industry Applications
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IEEJ Transactions on Industry Applications 128 (4), 523-528, 2008
The Institute of Electrical Engineers of Japan
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Details 詳細情報について
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- CRID
- 1390001204658068352
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- NII Article ID
- 10021134113
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- NII Book ID
- AN10012320
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- ISSN
- 13488163
- 09136339
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- NDL BIB ID
- 9453898
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed