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Positioning system, apparatus and method

  • US 7,212,159 B2
  • Filed: 12/09/2003
  • Issued: 05/01/2007
  • Est. Priority Date: 12/19/2002
  • Status: Expired due to Term
First Claim
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1. A positioning method using a transmitter device having a radio frequency transmitter and a receiver device having a receiver, a first one of which is a reference device at a known position and the other of which is a test device at an unknown position, using a number of passive reflectors at known positions, the method comprising transmitting a signal from the transmitter to the receiver, the signal having a number of signal components travelling from the transmitter to the receiver via the reflectors or directly;

  • receiving a plurality of the signal components of the transmitted signal in the receiver;

    measuring the arrival times of the signal components;

    identifying the signal components with the reflectors off which the signal component has reflected; and

    calculating the unknown position of the receiver device by mathematically finding an acceptably close fit of the measured arrival times of the signal components to the known positions of the identified reflectors and the position of the reference device.

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