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Chronometric, communication, identification, and tracking tag

  • US 6,721,681 B1
  • Filed: 12/28/2002
  • Issued: 04/13/2004
  • Est. Priority Date: 09/14/1999
  • Status: Active Grant
First Claim
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1. A chronometric location and tracking system, comprising:

  • a locator indicating a geographic location of an item coupled to said locator;

    a two-way radio system activating said locator to transmit a reply signal to determine location of said locator;

    a base unit having at least three antennas, said base unit transmitting a first signal;

    a first receiver operatively coupled to and traveling with said locator, said first receiver receiving said first signal;

    a first transmitter operatively coupled to said first receiver, said first transmitter transmitting a reply signal when activated by said first receiver;

    said base unit receiving said reply signal and determining a relative position of said locator from at least one antenna;

    said first signal containing a timing pulse;

    said receiver detecting said timing pulse and providing synchronization with said first signal; and

    said reply signal being synchronized with said first signal and transmitted at a different frequency than said first signal such that relative distance of said locator to at least one antenna may be determined.

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