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Route guidance on/off-route state filter

DC
  • US 5,508,931 A
  • Filed: 07/25/1994
  • Issued: 04/16/1996
  • Est. Priority Date: 05/15/1992
  • Status: Expired due to Term
First Claim
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1. A method for determining whether a vehicle is following a predetermined route on a map of roadways, said route comprising a selected portion of said roadways, the method comprising the steps of:

  • receiving a set of position possibilities corresponding to possible positions of said vehicle on said roadways of said map;

    verifying that the set of position possibilities are valid possibilities, thereby generating a first subset of position possibilities;

    filtering the first subset of position possibilities without reference to said predetermined route to remove those least likely to correspond to an actual position of the vehicle, thereby generating a second subset of position possibilities;

    filtering the second subset of position possibilities with reference to said predetermined route, thereby generating a set of remaining position possibilities;

    selecting a current position from the remaining position possibilities; and

    determining a route status of the vehicle based on said current position and said predetermined route.

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