Dynamic compass calibration in a portable device
First Claim
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1. A method for dynamic calibration of a compass in a portable device, comprising:
- monitoring, by a processor of the portable device, the magnitude of a raw magnetic field sensed by a magnetic sensor of the portable device over a time interval;
comparing, by the processor of the portable device, the monitored magnitude with at least one of a position, orientation, and movement of the portable device detected by at least one other sensor of the portable device; and
signaling a recalibration of the compass based on the comparison.
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Abstract
The magnitude of a sensed, raw magnetic field in a portable device is monitored over a given time interval. The monitored magnitude is compared with predetermined criteria. Based on the comparison, recalibration of a compass function is signed. Other embodiments are also described and claimed.
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Citations
12 Claims
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1. A method for dynamic calibration of a compass in a portable device, comprising:
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monitoring, by a processor of the portable device, the magnitude of a raw magnetic field sensed by a magnetic sensor of the portable device over a time interval; comparing, by the processor of the portable device, the monitored magnitude with at least one of a position, orientation, and movement of the portable device detected by at least one other sensor of the portable device; and signaling a recalibration of the compass based on the comparison. - View Dependent Claims (2, 3, 4)
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5. A portable device comprising:
a portable device housing having integrated therein; a magnetic sensor configured to sense a raw magnetic field, a compass calibrator coupled to the magnetic sensor, and an indicator module configured to; monitor a magnitude of the raw magnetic field over a time interval, compare the monitored magnitude with at least one of a position, orientation, and movement of the portable device detected by at least one other sensor of the portable device, and, based on the comparison, signal the calibrator to recalibrate. - View Dependent Claims (6, 7, 8)
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9. A non-transitory machine-readable medium having stored thereon instructions executable by a processor of a portable device, the instructions comprising:
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instructions for monitoring the magnitude of a sensed raw magnetic field over a time interval, instructions for comparing the monitored magnitude with at least one of a position, orientation, and movement of the portable device, and instructions for signaling a recalibration of a compass based on the comparison. - View Dependent Claims (10, 11, 12)
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Specification