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Fast user terminal position determination in a satellite communications system

  • US 6,298,238 B1
  • Filed: 09/09/1998
  • Issued: 10/02/2001
  • Est. Priority Date: 09/09/1998
  • Status: Expired due to Term
First Claim
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1. A method for determining the position of a user terminal in a satellite communications system, comprising the steps of:

  • (a) estimating the radius of the Earth at an initial user terminal position estimate to produce a coarse radius estimate;

    (b) determining a distance between the user terminal and a satellite;

    (c) determining a rate of change of said distance;

    (d) determining a coarse position estimate based on said coarse radius estimate, said distance, and said rate of change of said distance;

    (e) updating said coarse radius estimate using said coarse position estimate to produce a fine radius estimate; and

    (f) updating said coarse position estimate based on said fine radius estimate, said distance, and said rate of change of said distance to produce a fine position estimate for the user terminal.

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