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Method and apparatus for determining a position of a transmitter in three dimensions

  • US 6,760,591 B1
  • Filed: 05/22/2000
  • Issued: 07/06/2004
  • Est. Priority Date: 05/21/1999
  • Status: Expired due to Fees
First Claim
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1. A position determining method, which comprises:

  • transmitting a signal via a transmitter;

    receiving the signal in four receivers of an access and authorization control system, the receivers disposed separated from one another in three dimensions and not all in the same plane;

    determining time intervals between a reception of the signal by each of the four receivers using an evaluation unit;

    determining a signal delay time between the four receivers individually and the evaluation unit;

    using the evaluation unit for determining a position of the transmitter in three dimensions using the time intervals, a placement of the four receivers, and a propagation speed of the signal in space; and

    using the position of the transmitter in the access and authorization control system to access and authorize.

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