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Enhancing time keeping accuracy for low power GPS receivers

  • US 7,535,417 B2
  • Filed: 06/30/2004
  • Issued: 05/19/2009
  • Est. Priority Date: 06/30/2004
  • Status: Expired due to Fees
First Claim
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1. A mobile device comprising a positioning device for determining position by timing analysis of received signals, the positioning device comprising a system for determining timing accuracy, the system comprising:

  • a first signal generator configured to continuously generate a first clock signal whilst the positioning device is inactive;

    a second signal generator configured to discontinuously generate a second clock signal during a plurality of spaced apart time periods; and

    an accuracy determinator configured to determine the accuracy of the first clock signal using timing data from the second clock signal;

    the positioning device being arranged to determine position by use of the determined timing accuracy of the first clock, wherein the second clock signal is a system clock signal used for the communication circuitry in the mobile device.

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