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Timing circuit calibration in devices with selectable power modes

  • US 8,649,755 B2
  • Filed: 12/16/2011
  • Issued: 02/11/2014
  • Est. Priority Date: 12/16/2011
  • Status: Active Grant
First Claim
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1. A method comprising, with a device operable in a plurality of selectable power modes:

  • setting a timing circuit based, at least in part, on a phase value obtained from a signal acquired from a ground-based transmitter, wherein said signal comprises a pilot signal and said phase value is determined based, at least in part, on one or more time phase measurements of said pilot signal; and

    transitioning operation of said device to a lower power mode, wherein at least a portion of a receiver used to acquire said signal is disabled and at least a portion of enabled device circuitry uses said timing circuit, based, at least in part, on at least one of;

    a determination that a profile test indicating that said device is within a characterized environment is satisfied, at least in part, by said phase value;

    ora determination based, at least in part, on said phase value, that said device is in a constrained motion state.

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