Map data based position correction for vehicle navigation...

G - Physics – 08 – G

Patent

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Details

G08G 1/133 (2006.01) G01C 21/30 (2006.01) G01S 5/14 (2006.01)

Patent

CA 2150942

A vehicle navigation system is used to determine the absolute position of a vehicle with improved accuracy on freeways or rural highways. First, the system stores a known vehicle position in its memory. As the vehicle moves away from the known position, the system uses a variety of means (12, 14, 16, 18) to sense external signals. These means include satellite transmission receivers (18) and magnetic compasses (16). When a change in the external signals occurs, the system recognizes the presence of a landmark which can then be used to set the vehicle's position. To accomplish this, the system's data processor (20) searches a map data base (30), attempting to fix the position of the sensed landmark with respect to the initially stored known position. When the system identifies the most likely landmark, the position of the vehicle is then reset to that position.

Système de navigation de véhicule utilisé pour déterminer avec plus de précision la position absolue d'un véhicule sur des autoroutes ou des routes nationales rurales. Le système enregistre tout d'abord dans sa mémoire une position connue du véhicule. A mesure que le véhicule s'éloigne de la position connue, le système utilise divers dispositifs (12, 14, 16, 18) pour détecter des signaux externes. Ces dispositifs comprennent des récepteurs (18) de transmission par satellite et des compas magnétiques (16). Lorsqu'un changement apparaît dans les signaux externes, le système reconnaît la présence d'un point de repère qui peut alors servir à établir la position du véhicule. Pour cela, le processeur de données (20) du système explore une base de données cartographiques (30) et tente d'établir la position du point de repère détecté par rapport à la position connue enregistrée au départ. Lorsque le système identifie le point de repère le plus vraisemblable, la position du véhicule est alors recalée sur cette position.

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