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Method for determining vertical and horizontal GPS position using altitude information

  • US 6,552,681 B1
  • Filed: 10/02/2001
  • Issued: 04/22/2003
  • Est. Priority Date: 10/02/2000
  • Status: Expired due to Term
First Claim
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1. A method of determining a global positioning system (GPS) location, comprising the acts of:

  • receiving GPS measurements from a GPS device;

    calculating, as a three-dimensional solution, an initial position of said GPS device from said GPS measurements;

    determining, from an altitude database, an initial altitude corresponding to an initial latitude and an initial longitude of said initial position;

    calculating, as a two-dimensional solution using said initial altitude, a revised position of said GPS device from said GPS measurements;

    determining, from said altitude database, a revised altitude corresponding to a revised latitude and a revised longitude of said revised position; and

    calculating, as another two-dimensional solution using said revised altitude, another revised position of said GPS device from said GPS measurements.

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