Vehicle detection systems

Details Vehicle detection systems Vehicle detection systems

1978-10-20

1983-04-05

Groody, James J.

Communications: electrical

Selective

Having indication or alarm

340 62, 364436, 364438, G08G 101, G06G 776

Patent

active

043792804

ABSTRACT:
The detector system comprises a CW transmitter which is coupled to a receiver in a manner such that an approach of a vehicle produces an amplitude increasing excursion in the envelope of the received signal. At the receiver, the envelope of the received signal is sampled to derive the quantity .alpha.t/V.sub.p which is proportional to the speed of the vehicle, where V.sub.p is equivalent to the envelope voltage of the received signal at an instant I.sub.p during the leading edge portion of each excursion at which the first-occuring marked decrease of the slope of the leading edge occurs less the envelope voltage prior to the excursion and .alpha.t is an electrical quantity proportional to the maximum slope of the leading edge of each excursion during the leading edge portion preceding the instant I.sub.p.

REFERENCES:
patent: 3911389 (1975-10-01), Mills
patent: 4234923 (1980-11-01), Eshraghian et al.

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