Vehicle detection systems

Details Vehicle detection systems Vehicle detection systems

1978-06-22

1981-06-30

Groody, James J.

Communications: electrical

Selective

Having indication or alarm

307352, 324234, 328151, G08G 101

Patent

active

042765390

ABSTRACT:
Disclosed is a vehicle detection system comprising a transmitter coupled to a receiver via a sensor arranged to produce a change in the envelope of the received signal upon passage of a vehicle. In order to distinguish between changes in the received signal caused by variations in the environmental conditions and the approach of a vehicle, the system is provided with an identification circuit which periodically samples the received signal. The sampled voltages, which are representative of the envelope of the received signal, are then stored and supplied to a comparator which compares the envelope with the sampled voltage and provides an output signal indicating approach of a vehicle when the difference between the envelope level and the sampled voltage exceeds a predetermined value.

REFERENCES:
patent: 3115622 (1963-12-01), Jaffe
patent: 3801976 (1974-04-01), Ross et al.
patent: 3911389 (1975-10-01), Mills
patent: 3943339 (1976-03-01), Koerner et al.
patent: 3944912 (1976-03-01), Angel et al.

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