초록 ▼

A vehicle navigational system and method for tracking a vehicle, including a programmed computer, sensors for sensing the distance traveled and heading of the vehicle, and a stored map data base identifying a map of an area over which the vehicle is moving, in which the computer calculates and advan

A vehicle navigational system and method for tracking a vehicle, including a programmed computer, sensors for sensing the distance traveled and heading of the vehicle, and a stored map data base identifying a map of an area over which the vehicle is moving, in which the computer calculates and advances dead reckoned positions of the vehicle in response to distance and heading data, provides data identifying a contour of equal probability containing the dead reckoned positions and having a probability of containing the actual location of the vehicle, derives multiparameters from the map data base, and updates a given dead reckoned position and the contour using a highly developed vehicle navigational algorithm if a more probable dead reckoned position exists based upon the given dead reckoned position, the contour and the derived multi-parameters.

대표청구항 ▼

Apparatus for providing information to improve the accuracy of tracking a vehicle movable over streets in a given area, comprising: (a) first means for providing data identifying respective positions of the vehicle, each position having an accuracy relative to an actual location of the vehicle and o

Apparatus for providing information to improve the accuracy of tracking a vehicle movable over streets in a given area, comprising: (a) first means for providing data identifying respective positions of the vehicle, each position having an accuracy relative to an actual location of the vehicle and one of said positions being a current position, and for providing data identifying a measured heading of the vehicle; (b) second means for providing a map data base of the streets; and (c) means for deriving any of a plurality of parameters in dependence on one or more respective positions of the vehicle and the streets of the map data base to determine if a more probable current position exists, wherein one of said parameters is the measured heading of the vehicle as compared with the headings of the streets of the map data base. Apparatus for providing information to improve the accuracy of tracking a vehicle movable over streets, comprising: (a) first means for providing data identifying respective positions of the vehicle, each position having a certain accuracy and a current position possibly being subject to being updated; and (b) second means for providing an estimate of the accuracy of the positions of the vehicle, the estimate changing as the vehicle moves and changing if the current position is updated, the estimate being used to determine if a more probable position than the current position exists.