Vehicle navigational system and method

  • US 4,796,191 A
  • Filed: 06/07/1984
  • Issued: 01/03/1989
  • Est. Priority Date: 06/07/1984
  • Status: Expired due to Term
First Claim
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1. 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.

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