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Position-locating method and apparatus including corrections for elevational changes

  • US 5,574,649 A
  • Filed: 06/05/1995
  • Issued: 11/12/1996
  • Est. Priority Date: 09/27/1991
  • Status: Expired due to Fees
First Claim
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1. A method of determining the instantaneous location of a land vehicle travelling on a terrain, comprising the following operations:

  • measuring an approximate location of the land vehicle as said vehicle travels on the terrain by continuously measuring distances and headings of the land vehicle as said vehicle travels on the terrain from a known location, and determining the approximate location of said land vehicle by dead reckoning;

    measuring changes in elevation of the land vehicle as said vehicle travels on the terrain;

    continuously utilizing said measured changes in elevation for computing the horizontal component of said measured distances in order to determine the instantaneous location of the land vehicle on the terrain;

    storing reference data which includes changes in sign in the elevation slope of known locations on said terrain; and

    utilizing the changes in sign in the elevation slope of the reference data having known locations, and the changes in sign in the elevation slope of the measured data whose location was determined by dead reckoning, for periodically correcting the instantaneous location of the land vehicle on said terrain.

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