Determining clock-drift using signals of opportunity
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United States of America Patent
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Jun 13, 2017
Grant Date -
Nov 5, 2015
app pub date -
Apr 29, 2015
filing date -
Apr 30, 2014
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Abstract
A method and apparatus for determining a drift between a local clock of a movable device and a reference clock that is used by one or more reference devices. The local clock may be calibrated at a calibration location and then the movable device may be moved to an operating location that is different from the calibration location. The drift is determined by observing one or more signals transmitted by the respective one or more reference devices, when the device is at the calibration location and when it is at the operating location. These observations are used together with a model of the signals to determine the drift.
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