Automatic vehicle identification system capable of vehicle lane

Details Automatic vehicle identification system capable of vehicle lane Automatic vehicle identification system capable of vehicle lane

1998-04-03

2000-05-16

Wu, Daniel J.

Communications: electrical

Vehicle detectors

340928, 34082554, 342 42, 342 51, 455 47, G08G 101

Patent

active

06064320&

ABSTRACT:
A system of vehicle identification with a first interrogator that uses a Lower SideBand (LSB) receiver to receive a modulated signal from a vehicle transponder and a second interrogator that uses an Upper SideBand (USB) receiver to receive another modulated signal. The two interrogators are adjacent to each other at a toll plaza, and operate at different carrier frequencies to force a signal frequency bandgap between communication signals in adjacent vehicle lanes.

REFERENCES:
patent: 4739328 (1988-04-01), Koelle et al.
patent: 5471212 (1995-11-01), Sharpe et al.
patent: 5485520 (1996-01-01), Chaum et al.
patent: 5701127 (1997-12-01), Sharpe
patent: 5809142 (1998-09-01), Hurta et al.
patent: 5828693 (1998-10-01), Mays et al.

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