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Method and apparatus for determining the location of an object which may have an obstructed view of the sky

  • US 5,831,574 A
  • Filed: 10/07/1996
  • Issued: 11/03/1998
  • Est. Priority Date: 03/08/1996
  • Status: Expired due to Term
First Claim
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1. A method of operating a global positioning system (GPS) receiver, comprising:

  • sensing whether GPS signals are capable of being received from GPS satellites and providing an activation signal when GPS signals are capable of being received;

    maintaining said GPS receiver in a low power state; and

    activating said GPS receiver from said low power state upon detecting said activation signal.

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