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Apparatus and method for determining location and tracking coordinates of a tracking device

DC CAFC
  • US 8,542,113 B2
  • Filed: 01/23/2012
  • Issued: 09/24/2013
  • Est. Priority Date: 01/06/2008
  • Status: Active Grant
First Claim
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1. A method to control power usage comprising:

  • measuring a receive communication signal level by primary location tracking circuitry of an electronic tracking device communicated by a primary location tracking system;

    reducing applied power level to the primary location tracking circuitry in response to measurement of a receive communication signal level less than a first signal level;

    increasing applied power level to supplemental location tracking circuitry response to measurement of the receive communication signal less than the first signal level;

    determining differential positional measurements based in part on acceleration measurements of supplemental location tracking circuitry associated with a secondary location tracking system; and

    determining positional coordinates of electronic tracking device responsive to a known reference coordinate values and the differential positional measurements.

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