System for detecting the passage of a mobile including a passive responder
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United States of America Patent
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Sep 19, 1995
Grant Date -
N/A
app pub date -
May 10, 1993
filing date -
May 15, 1992
priority date (Note) -
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Abstract
The system comprises an interrogation assembly and a passive responder. One is carried by a mobile and the other by a track. The interrogation assembly includes continuously operating low frequency and medium frequency transmitters. The transmitters have respective antennas directed towards a predetermined zone with respect to the antennas, which is traversed by the responder during movement of the mobile. It further has a unit which is responsive to the characteristics of the responder when the responder is in the zone. The responder has a low frequency reception circuit which controls a medium frequency circuit. Both circuits have radiating circuits which are tuned and the low frequency signal generated in the low frequency circuit is used to short-circuit the medium frequency tuned circuit of the responder, at the rate of low frequency rate.
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