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Vehicle navigation system and method

DC
  • US 5,862,511 A
  • Filed: 12/28/1995
  • Issued: 01/19/1999
  • Est. Priority Date: 12/28/1995
  • Status: Expired due to Term
First Claim
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1. An improved vehicle navigation system comprising:

  • a map database with map information, said vehicle navigation system derives a map heading from said map information; and

    a GPS receiver which provides GPS velocity information including a heading, said vehicle navigation system uses said velocity information to propagate a previous position to a current position and interrogates said map database to obtain said map heading information;

    said vehicle navigation system updates said velocity information with said map heading for propagating said previous position to said current position if the difference between the heading of said velocity information and said map heading are within a threshold, wherein said system rotates said velocity to align with said map heading and integrates the rotated velocity to obtain displacements;

    said system obtains said current position by applying said displacements to said previous position.

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