Communications: electrical – Traffic control indicator
Patent
1997-12-18
1999-03-09
Hofsass, Jeffery A.
Communications: electrical
Traffic control indicator
340933, 340941, 32420713, 324244, G08G 1095
Patent
active
058806822
ABSTRACT:
A vehicle detector comprising a flux gate magnetometer with vertical and horizontal sensing coils is positioned within a roadway. The ambient levels of the earth's magnetic field as sensed by the magnetometer are used to establish reference levels and deviations therefrom are evaluated by a microprocessor which produces a vehicle arrived signal when the vertical component of sensed perturbations exceed a threshold and in an alternate mode when either vertical or horizontal levels exceed threshold values. Both vertical and horizontal levels must fall below threshold levels to determine a departure in either mode. Vehicle arrival and departure events are encoded as NRZ data packets which are transmitted by an edge-fired antenna as FM modulated signals. A remote multi-channel receiver capable of responding to a plurality of magnetometer modulated FM transmitters processes the received data and provides signals that are used by traffic signal controlling computers.
REFERENCES:
patent: 5530349 (1996-06-01), Lopez et al.
Matacia Stephen M.
Soulliard Charles J.
Ward Herschel W.
Gell Harold
Hofsass Jeffery A.
Midian Electronics, Inc.
Pope Daryl C.
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