System for detecting the passage of a mobile including a passive

Details System for detecting the passage of a mobile including a passive System for detecting the passage of a mobile including a passive

1993-05-10

1995-09-19

Rogers, Scott A.

Communications: electrical

Vehicle detectors

34082554, 340572, G08G 101

Patent

active

054519411

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.

REFERENCES:
patent: 4038653 (1977-07-01), Brewster
patent: 4893118 (1990-01-01), Lewiner et al.
patent: 4912471 (1990-03-01), Tyburski et al.
patent: 5105190 (1992-04-01), Kip et al.

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