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Method and system for navigation employing incremental range difference

  • US 4,024,383 A
  • Filed: 09/02/1975
  • Issued: 05/17/1977
  • Est. Priority Date: 09/02/1975
  • Status: Expired due to Term
First Claim
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1. A method of navigation comprising the steps of:

  • a. determining an initial position relative to a plurality of known points each located at predetermined geographic positions and each having a source of radio frequency electromagnetic wave energy;

    b. determining the distance of the initial position from each of the plurality of known points;

    c. moving to a second and unknown position;

    d. determining the difference between the propagation time of electromagnetic wave energy from each of the plurality of points at the initial and second positions to thereby determine an incremental change in the distance to the second position from each of the plurality of points;

    e. algebraically summing the distance of the initial position and the incremental change in distance from each of the plurality of points to thereby determine the distance of the second position from each of the plurality of known points; and

    ,f. determining the second position from the determined distances of the second position from each of the plurality of known points.

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