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Method and apparatus for generating and using a regional-terrain model

  • US 8,301,370 B2
  • Filed: 05/28/2010
  • Issued: 10/30/2012
  • Est. Priority Date: 03/21/2006
  • Status: Active Grant
First Claim
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1. A method for computing position in a receiver, comprising:

  • obtaining pseudorange measurements at a location, with a circuit of the receiver;

    determining a speed of the receiver;

    comparing the speed of the receiver to a threshold value; and

    if the speed of the receiver is below the threshold value,obtaining from a regional-terrain model altitude information associated with a modeled region, wherein the location is in a vicinity of the modeled region; and

    computing a position as a function of the pseudorange measurements and the altitude information,wherein obtaining from a regional-terrain model altitude information comprises obtaining from the regional-terrain model an altitude and an altitude uncertainty.

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