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Asset tracking method

  • US 20060022867A1
  • Filed: 07/27/2004
  • Published: 02/02/2006
  • Est. Priority Date: 07/27/2004
  • Status: Active Grant
First Claim
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1. An asset tracking system comprising:

  • mobile tracking device comprising;

    a GPS receiver, and a processor, and a digital data transmitter; and

    a local fixed device comprising;

    a GPS receiver, and a processor, and a digital data transceiver; and

    reference devices comprising;

    a GPS receiver, and a processor, and a digital data transceiver;

    wherein said mobile tracking device receives uncorrected GPS-based position information and transmits said information to the local fixed device;

    wherein said local fixed device accumulates and transmits said uncorrected GPS-based position information from said mobile tracking device;

    wherein said reference device receives and applies differential corrections to said accumulated and transmitted uncorrected information; and

    wherein said reference device prepares said corrected information for re-transmission.

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