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Apparatus for calculating position of vehicle

  • US 4,713,767 A
  • Filed: 05/06/1985
  • Issued: 12/15/1987
  • Est. Priority Date: 05/09/1984
  • Status: Expired due to Fees
First Claim
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1. A vehicle position calculating apparatus comprising:

  • (a) traveled-distance sensor means for detecting a distance traveled by a vehicle;

    (b) bearing sensor means for detecting a vehicle advancing direction;

    (c) relative position calculating means for calculating relative vehicle positions with respect to reference positions using an inertial navigation method employing said distance traveled and said vehicle advancing direction respectively detected by said traveled-distance sensor means and said bearing sensor means; and

    (d) absolute position calculating means for calculating absolute vehicle positions based on fixed-station absolute position information and a plurality of items of vehicle bearing information which are obtained by a radio wave transmitted from a fixed station and said relative vehicle positions calculated by said relative position calculating means at a plurality of points where respective items of vehicle bearing information are obtained;

    said relative position calculating means including means for calculating a present vehicle position by employing the successively calculated absolute vehicle positions as said reference positions.

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