Facility for intermittent transmission of information between guideway wayside equipment and vehicles moving along the guideway
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United States of America Patent
Stats
-
Oct 29, 1985
Issued Date -
N/A
app pub date -
Oct 19, 1983
filing date -
Oct 24, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A facility is disclosed comprising an on-board interrogator and a passive trackside transponder which transmits data messages to the interrogator on a single FM channel using, for instance, frequency shift techniques and draws the necessary transmitting energy from an alternating magnetic field produced by the interrogator. The antenna of the interrogator and the transponder are ferrite-rod antennas which are enclosed in housings similar to that used in inductive signalling equipment. The magnetic interaction between the active portion and the passive portion of the facility is used to locate faulty passive transponders.
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Family
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Cited Art Landscape
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