Development Of A Railway Signaling Device
Based On Mixed Digital And Analog Signals Using
Digital Signal Processors
Author(s)
R. Ishikawa, D. Koshino, H. Mochizuki, S. Takahashi,
H. Nakamura, S. Nishida & M. Sano
Abstract
In Japan, automatic train control (ATC) systems, one type of railway signaling system,
transmit train control information by using analog signals based on amplitude
modulation (AM) in the audio frequency band. To realize highly functional train
control by increasing the data transmission speed, there have been many studies on
digital ATC that transmits train control information by using digital signals based
on phase shift keying (PSK), and these systems are employed in some railway
lines. In practice, however, it is difficult to install digital ATC because it is impossible
to ensure another transmission band for digital ATC signals due to the existing
track circuit configuration and interoperability conditions, and there are many
railway lines in which analog ATC is still employed. To overcome this restriction,
we proposed a novel railway signaling system using mixed digital and analog signals.
We employed quadrature PSK (QPSK) for digital signals and developed a
transmission device using digital signal processors.We evaluated the transmission
characteristics by conducting a basic experiment.
Keywords: railway signaling, amplitude modulation, phase shift keying, digital
signal processor.
1 Introduction
In Japan, automatic train control (ATC) systems ensure railway safety by transmitting
train control data via the rails based on amplitude modulation (AM) in the
audio frequency band. There is currently a great deal of research on digital ATC,
Keywords
railway signaling, amplitude modulation, phase shift keying, digital
signal processor
Related Book
Other papers in this volume
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