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Method and apparatus for adjusting distance for generating maneuver instruction for navigation system

  • US 8,560,231 B2
  • Filed: 10/23/2012
  • Issued: 10/15/2013
  • Est. Priority Date: 02/26/2008
  • Status: Active Grant
First Claim
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1. A distance adjustment method for a navigation system, comprising the following steps of:

  • conducting, by using a central processor unit, a route guidance operation of the navigation system for guiding a user to a destination through a calculated route;

    searching an upcoming intersection on the calculated route that requires the user to make a turn therein within a predetermined distance range ahead from a current position;

    retrieving data concerning the upcoming intersection from a map database;

    retrieving a reference distance from a reference point of the intersection;

    determining an adjusted distance based on a direction of a turning maneuver at the intersection and other relevant information derived from the retrieved data concerning the intersection, which further includes the steps of;

    incorporating a half width of a road segment where one road segment is involved in the intersection;

    incorporating a half width of a center divider of the intersection;

    either adding or subtracting the half width of the road segment and the center divider from the reference distance depending on the direction of the turning maneuver;

    establishing a final distance from the reference point of the intersection by incorporating the adjusted distance; and

    generating a maneuver instruction at a timing when the user has reached the final distance from the reference point of the intersection, thereby notifying the user to make the turning maneuver at the intersection;

    wherein the adjusted distance is greater than zero.

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