Technical Reports

Advanced Group Rapid Transit Guideway Communication Unit Design Summary

  • 01
  • Oct
  • 1984
AUTHOR: Claude W. Colson
SUBJECT: High-Speed Passenger Rail
KEYWORDS: Automated Guideway Transit System, Digital Receiver, Failsafe, Impulse Noise, Interface, Magnetic Signaling, Safety
ABSTRACT: The purpose of the Advanced Group Rapid Transit (AGRT) program was to develop an advanced automated guideway transit system capable of providing high passenger volumes, short waiting times, and high levels of passenger service. The transportation system developed consists of small, automated vehicles which operate on a single lane guideway at short headways with unmanned, off-line stations. This report summarizes the design and development of the Guideway Communication Unit (GCU) for the AGRT program. The GCU is a subsystem of the AGRT command and control subsystem. It functions as an interface between the vehicle command and control subsystem and the test track command and control subsystem. It contains an unductive communication link, a vehicle presence detection system, and magnetic guideway markers. The inductive communication link provides a two-way command and control data path between the wayside and vehicles. This link also provides a failsafe speed limit to the vehicle. The design utilizes eight bit microcomputers and incorporates unique self-exercised software to detect potentially unsafe latent failures within the hardware. A digital FSK receiver was designed which operates in the severe impulse noise environment with low bit error rate. The digital FSK receiver is also implemented with an eight bit microcomputer. The development of the GCU has produced several innovative solutions to difficult problems that may be useful to future designers. Details of these design innovations are contained within this report.
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