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Method and system of three-dimensional positional finding

  • US 7,423,580 B2
  • Filed: 03/14/2006
  • Issued: 09/09/2008
  • Est. Priority Date: 03/14/2005
  • Status: Active Grant
First Claim
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1. An RF system for finding a target T in three dimensional space,comprising:

  • a slave unit disposed on the target T, said slave unit configured as a transponder;

    a monitoring unit configured as a transceiver for monitoring the location of the target T;

    a wireless communication system, said wireless communication system operating on a Radio Frequency (RF) bandwidth configured to allow communication between said slave and monitoring units, said monitoring unit configured to transmit a ranging signal to said slave unit, said slave unit responding to said ranging signal by transmitting a reply ranging signal, said wireless communication system further comprising;

    a processor for determining position information of the target T, said processor in communication with an antenna, said processor being configured to repeatedly determine values for said position information from;

    means for determining a transmission interval between said monitoring unit and said slave unit, said transmission interval being an elapsed time between transmitting said ranging signal and receiving said reply ranging signal,means for determining a calibration interval between each of said monitoring unit and slave unit said calibration interval being a time interval of a period to normalize the circuitry of said monitoring and slave units, andmeans for determining an antenna propagation interval of said units, said antenna propagation interval being an elapsed time of a signal measured as it passes through said antenna of said monitoring and slave units,andmeans for generating a measured distance between units in three dimensional space, said distance generating means determining said measured distance of the target T by a spherical virtual triangulation relationship when successive values of said position information has a predetermined logical relationship relative to said previous values between said monitoring unit and slave unit.

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