Vehicle communication system using existing roadway loops

Details Vehicle communication system using existing roadway loops Vehicle communication system using existing roadway loops

1987-12-28

1990-05-15

Griffin, Robert L.

Telecommunications

Transmitter and receiver at separate stations

Short range rf communication

455 55, 455 99, 340941, 340989, 34082554, H04B 500

Patent

active

049264940

ABSTRACT:
A method and system for transferring information between a moving vehicle and a stationary information location having a vehicle detector system with a loop antenna by using the loop antenna as either the receiving antenna for signals transmitted from a moving vehicle or as the transmitting antenna for signals generated by a transmitter located at the vehicle detector site for transfer to a receiver mounted on a moving vehicle. The information is encoded on a carrier having a frequency outside the normal frequency range of the vehicle detector system, preferably by interrupted carrier pattern processing.

REFERENCES:
patent: 4630044 (1986-12-01), Polzer
patent: 4714925 (1987-12-01), Bartlett
patent: 4731867 (1988-03-01), Seabury

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