Vehicle communication system using existing roadway loops wherei

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

1991-05-16

1993-03-30

Ng, Jin F.

Communications: electrical

External condition vehicle-mounted indicator or alarm

Highway information

340941, 455 41, 455 99, G08G 109

Patent

active

051988119

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: 3609247 (1971-09-01), Halstead
patent: 4529982 (1985-07-01), Karlstrom et al.

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