Train Position Detecting System Using Radio
Millimeter-waves
Author(s)
T. Maeda, K. Watanabe & M. Ono
Abstract
The Maglev on the Yamanashi Test Line is driven by LSM (Linear Synchronous
Motor). Train control needs a precise position of the train in order to achieve
stable and efficient operation of the LSM drive. Moreover, the information of the
train position is important from the viewpoint of safety, because it is used to
check a train speed for safety brake control that assures the last method. In the
Yamanashi Maglev Test Line, a train position is detected by the inductive radio
system. The inductive radio system is reliable and accurate. On the other hand,
the cost of construction and maintenance of the inductive radio system is
expensive, because the cross-inductive cable has to be laid along the guideway
accurately and the Local Position Detectors have to be installed about every
2km. Thus, the train position detecting system has been developed without
inductive wire in order to reduce construction and maintenance cost. It detects
the train position by a combination of several methods, such as an EMF
(Electromotive Force) observer, a tachometer of the wheel, a counter of ground
coils for levitation and guidance, and radio millimeter-waves. In this paper, out
of those detecting methods, the train position detecting system using radio
millimeter-waves is presented.
Keywords: radio system, millimeter-wave, position detecting system, maglev.
1 Introduction
Since 1997, running tests have progressed smoothly, for over 400,000km and
setting a new world speed record of 581km/h, in Yamanashi Maglev Test Line.
Recently, long-term endurance test has been performed and research and
development activities have been continued in order to reduce the cost of the
commercial system.
Keywords
radio system, millimeter-wave, position detecting system, maglev.
Related Book
Other papers in this volume
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