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Systems and methods for calibrating unstable sensors

  • US 10,514,258 B2
  • Filed: 08/31/2017
  • Issued: 12/24/2019
  • Est. Priority Date: 09/09/2016
  • Status: Active Grant
First Claim
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1. A method for calibrating a sensor of a mobile device, the method comprising:

  • determining a first estimated position of the mobile device without using any measurement from the sensor of the mobile device;

    generating a second estimated position of the mobile device using a measurement from the sensor;

    estimating a sensor error of the sensor using the first estimated position and the second estimated position; and

    using the sensor error to determine a calibration value for adjusting one or more measurements from the sensor,wherein the sensor is a pressure sensor of the mobile device, andwherein the calibration value is determined by;

    identifying a pressure sensor calibration equation that includes calibration coefficient values;

    identifying temperature measurements of the pressure sensor and corresponding sensor error measurements for the pressure sensor, wherein each temperature measurement of the identified temperature measurements was measured when the pressure sensor made a corresponding measurement of pressure that was used to determine a corresponding sensor error measurement of the identified sensor error measurements;

    determining calibration coefficient adjustment values by performing a polynomial fit using the identified temperature measurements and corresponding sensor error measurements;

    determining an adjusted pressure sensor calibration equation by using the calibration coefficient adjustment values to adjust the calibration coefficient values of the pressure sensor calibration equation; and

    determining the calibration value using the adjusted pressure sensor calibration equation.

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