초록 ▼

A method and apparatus are provided for providing route guidance to a user of a vehicle navigation system. A route is generated which corresponds to a plurality of maneuvers. A warning distance is determined from a particular geographic location associated with a particular maneuver, the warning dis

A method and apparatus are provided for providing route guidance to a user of a vehicle navigation system. A route is generated which corresponds to a plurality of maneuvers. A warning distance is determined from a particular geographic location associated with a particular maneuver, the warning distance being based in part on a variable parameter. A maneuver instruction corresponding to the particular maneuver is then provided at the warning distance from the particular geographic location. In some embodiments, where the particular maneuver corresponds to a first junction, and a second junction similar to the first junction is within the warning distance, the warning distance is adjusted to an adjusted warning distance.

대표청구항 ▼

[ What is claimed is:] [13.] A vehicle navigation system, comprising:a plurality of sensors for detecting a current vehicle position, a vehicle heading, and vehicle motion, and generating signals indicative thereof;a database medium having geographic locations of a plurality of road segments and jun

[ What is claimed is:] [13.] A vehicle navigation system, comprising:a plurality of sensors for detecting a current vehicle position, a vehicle heading, and vehicle motion, and generating signals indicative thereof;a database medium having geographic locations of a plurality of road segments and junctions stored therein;a processor coupled to the sensors and the database medium which is configured to:generate a route which corresponds to a plurality of maneuvers;calculate a warning distance from a particular geographic location associated with a particular maneuver, the warning distance being based in part on a vehicle speed; andprovide a maneuver instruction corresponding to the particular maneuver at the warning distance from the particular geographic location;wherein the warning distance has a minimum limit and a maximum limit and is calculated using the equations: EQU d.sub.w =d.sub.max, for v.sub.a >v.sub.max EQU d.sub.w =d.sub.min +[(d.sub.max -d.sub.min).multidot.(v.sub.a -v.sub.min)]/(v.sub.max -v.sub.min), for v.sub.max .gtoreq.v.sub.a .gtoreq.v.sub.min EQU d.sub.w =d.sub.min, for v.sub.a