Calibration techniques for activity sensing devices

  • US 9,154,554 B2
  • Filed: 06/30/2008
  • Issued: 10/06/2015
  • Est. Priority Date: 05/22/2006
  • Status: Active Grant
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First Claim
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1. A method for calibrating an activity monitoring system associated with a user, the method comprising:

  • performing a first calibration to produce first modified calibration data, including;

    receiving, at a portable electronic device associated with the activity monitoring system and from an activity sensor, first activity data measurements;

    generating the first modified calibration data from existing calibration data and the first activity data measurements; and

    subsequently performing a second calibration to produce second modified calibration data including;

    receiving, at the portable electronic device, an input of an actual distance;

    receiving, at the portable electronic device and from the activity sensor, second activity data measurements;

    determining, using the first modified calibration data and the second activity data measurements, an estimated elapsed distance generated during the second calibration;

    determining an accuracy ratio based upon the estimated elapsed distance and the actual distance;

    comparing the accuracy ratio to a threshold value;

    if the accuracy ratio is determined to be greater than the threshold value, aborting the second calibration, wherein the accuracy ratio greater than the threshold value indicates that the estimated elapsed distance diverges from the actual distance by more than a set margin; and

    if the accuracy ratio is determined to be less than the threshold value, generating the second modified calibration data using the accuracy ratio.

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