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Method and apparatus for location determination of people or objects

  • US 7,636,061 B1
  • Filed: 01/28/2006
  • Issued: 12/22/2009
  • Est. Priority Date: 04/21/2005
  • Status: Expired due to Fees
First Claim
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1. A position location system, comprising:

  • a plurality of portable transmitters, each of said plurality of portable transmitters configured for transmitting frequency modulation (FM) signals, wherein each of said transmitted FM signals comprises location information associated with its transmitter;

    a synchronizer in communication with each of said plurality of transmitters for locking said FM signal transmissions to a common clock, wherein said common clock comprises a global positioning system (GPS) time clock;

    a receiver configured for receiving said FM signals emitted from each of said plurality of portable transmitters; and

    a processor in communication with said receiver for calculating a location of said receiver using said location information from each of said plurality of portable transmitters and time differences detected amongst each of said transmitted FM signals.

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