OPPORTUNISTIC CALIBRATION OF A BAROMETER IN A MOBILE DEVICE
First Claim
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1. A method, at a mobile device, comprising:
- determining that the mobile device is located at a first frequently visited location based, at least in part on an association of measured characteristics of radio frequency signals with expected signature values or detection that the mobile device is receiving power from an external power source, or a combination thereof;
determining that a barometric pressure sensor on board the mobile device is in a calibrated state;
obtaining a first pressure measurement from the barometric pressure sensor while located at the first frequently visited location;
storing a first indication of an altitude of the mobile device and an indication of the first frequently visited location, the first indication of the altitude of the mobile device being based, at least in part, on the first pressure measurement;
determining that the mobile device has returned to the first frequently visited location;
obtaining a second pressure measurement from the barometric pressure sensor while located at the frequently visited location; and
calibrating the barometric pressure sensor based, at least in part, on the stored first indication of the altitude of the mobile device and on the second pressure measurement.
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Abstract
Disclosed are systems, methods and techniques for calibrating a barometric pressure sensor of a mobile device. In one embodiment, a barometric pressure sensor of a mobile device may be calibrated by determining that the mobile device has returned to a frequently visited location at which an altitude is known. The know altitude may then be used for calibrating the barometric pressure sensor for obtaining altitude measurements based on raw measurements obtained by the barometric pressure sensor.
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Citations
30 Claims
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1. A method, at a mobile device, comprising:
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determining that the mobile device is located at a first frequently visited location based, at least in part on an association of measured characteristics of radio frequency signals with expected signature values or detection that the mobile device is receiving power from an external power source, or a combination thereof; determining that a barometric pressure sensor on board the mobile device is in a calibrated state; obtaining a first pressure measurement from the barometric pressure sensor while located at the first frequently visited location; storing a first indication of an altitude of the mobile device and an indication of the first frequently visited location, the first indication of the altitude of the mobile device being based, at least in part, on the first pressure measurement; determining that the mobile device has returned to the first frequently visited location; obtaining a second pressure measurement from the barometric pressure sensor while located at the frequently visited location; and calibrating the barometric pressure sensor based, at least in part, on the stored first indication of the altitude of the mobile device and on the second pressure measurement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A mobile device comprising:
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a barometric pressure sensor; and one or more processors coupled to the barometric pressure sensor by a bus, the one or more processors being configured to; determine that the mobile device is located at a first frequently visited location based, at least in part on an association of measured characteristics of radio frequency signals with expected signature values or detection that the mobile device is receiving power from an external power source, or a combination thereof; determine that the barometric pressure sensor is in a calibrated state; obtain a first pressure measurement from the barometric pressure sensor while the mobile device is located at the frequently visited location; store a first indication of an altitude of the mobile device and an indication of the first frequently visited location, the first indication of the altitude of the mobile device being based, at least in part, on the first pressure measurement; determine that the mobile device has returned to the first frequently visited location; obtain a second pressure measurement from the barometric pressure sensor while located at the first frequently visited location; and calibrate the barometric pressure sensor based, at least in part, on the stored first indication of the altitude of the mobile device and on the second pressure measurement. - View Dependent Claims (23, 24, 25, 26, 27, 28)
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29. A non-transitory storage medium comprising computer readable instructions stored thereon which are executable by a processor of a mobile device to:
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determine that the mobile device is located at a first frequently visited location based, at least in part on an association of measured characteristics of radio frequency signals with expected signature values or detection that the mobile device is receiving power from an external power source, or a combination thereof; determine that a barometric pressure sensor on board the mobile device is in a calibrated state; obtain a first pressure measurement from the barometric pressure sensor while the mobile device is located at the first frequently visited location; store a first indication of an altitude of the mobile device and an indication of the first frequently visited location, the first indication of the altitude of the mobile device being based, at least in part, on the first pressure measurement; determine that the mobile device has returned to the first frequently visited location; obtain a second pressure measurement from the barometric pressure sensor while located at the first frequently visited location; and calibrate the barometric pressure sensor based, at least in part, on the stored first indication of the altitude of the mobile device and on the second pressure measurement.
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30. A mobile device comprising:
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means for determining that the mobile device is located at a first frequently visited location based, at least in part on an association of measured characteristics of radio frequency signals with expected signature values or detection that the mobile device is receiving power from an external power source, or a combination thereof; means for determining that a barometric pressure sensor on board the mobile device is in a calibrated state; means for obtaining a first pressure measurement from the barometric pressure sensor while located at the first frequently visited location; means for storing a first indication of an altitude of the mobile device and an indication of the first frequently visited location, the first indication of the altitude of the mobile device being based, at least in part, on the first pressure measurement; means for determining that the mobile device has returned to the first frequently visited location; means for obtaining a second pressure measurement from the barometric pressure sensor while located at the first frequently visited location; and means for calibrating the barometric pressure sensor based, at least in part, on the stored first indication of the altitude of the mobile device and on the second pressure measurement.
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Specification