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Tracking and position determination system

  • US 4,060,809 A
  • Filed: 04/09/1975
  • Issued: 11/29/1977
  • Est. Priority Date: 04/09/1975
  • Status: Expired due to Term
First Claim
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1. A method of determining position coordinates of an object relative to a reference coordinate system, comprising the steps of:

  • radiating carrier waves from a radiating position at one of said object and a station having a known location in said reference coordinate system;

    receiving the carrier waves at a receiving position at the other of said object and said station;

    varying the location of at least one of said radiating and said receiving positions in a first predetermined manner and a second predetermined manner, different from the first;

    measuring the frequency of the received carrier waves when the location of the one of said radiating and receiving positions is varied in the first predetermined manner;

    measuring the frequency of the received carrier waves when the location of the one of said radiating and receiving positions is varied in the second predetermined manner; and

    determining a position coordinate of the object responsive to a difference between the measured frequencies of the received carrier waves.

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