Traffic information warning system

G - Physics – 08 – G

Patent

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Details

G08G 1/0962 (2006.01) G08G 1/0965 (2006.01) G08G 1/0967 (2006.01)

Patent

CA 2238392

A traffic information warning system (10) for conveying traffic information from a traffic advisory site to a vehicle (16) is disclosed. The system (10) comprises a transmitter (18) adapted for placement at an advisory site and a receiver (20) adapted for placement at a vehicle (16). The transmitter (18) includes a first oscillator (22) for transmitting a first carrier signal and a second oscillator (24) for transmitting a second carrier signal. The first carrier signal frequency and the second carrier signal frequency are spaced apart by a predetermined frequency difference. The receiver (20) includes scanning circuitry, to detect carrier signals separated by the predetermined frequency difference and a demodulator (29) for retrieving a first retrieved modulating signal about the first carrier signal and a second retrieved modulating signal about the second carrier signal. The receiver (20) also uses a microprocessor (28) to compare the first retrieved modulating signal to the second retrieved modulating signal. The receiver includes an announcing device (31, 32).

La présente invention concerne un système d'information routière (10) permettant de transmettre à un véhicule (16) des informations routières provenant d'un point d'information routière. Le système est constitué d'un émetteur (18) à implanter au point d'information et d'un récepteur (20) embarqué à bord d'un véhicule (16). Cet émetteur (18) est comstitué d'un premier oscillateur (22) émettant un premier signal de porteuse, et d'un second oscillateur (24) émettant un second signal de porteuse. Une différence de fréquences déterminée sépare entre elles la fréquence du premier signal de porteuse et la fréquence du second signal de porteuse. Le récepteur (20) comporte un circuit d'exploration permettant de détecter kes signaux de porteuse séparés entre eux par la différence déterminée de fréquences, et d'un démodulateur (29) permettant de restituer un premier signal de modulation déduit du premier signal de porteuse et unsecond signal de modulation déduit du second signal de porteuse. Un microprocesseur (28) permet également au récepteur (20) de comparer le premier signal de modulation restitué au second signal de modulation restitué. Le récepteur inclut un dispositif d'annonce (31, 32).

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