ACCURACY INDICATIONS FOR AN ELECTRONIC COMPASS IN A PORTABLE DEVICE
First Claim
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1. A machine-implemented method for providing a user with accuracy indications for a compass, comprising:
- calculating a plurality of instances of a geomagnetic field;
calculating a plurality of instances of an average magnitude of a subset of the plurality of instances of the geomagnetic field;
detecting whether said average magnitude changes by more than a first predetermined threshold; and
informing the user that compass accuracy has degraded, in response to having detected that the average magnitude has changed by more than the first predetermined threshold.
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Abstract
Multiple instances of a geomagnetic field are calculated. Multiple instances of an average magnitude of a subset of the instances of the geomagnetic field are also calculated. When the average magnitude changes by more than a first predetermined threshold, the user is informed that compass accuracy has degraded. Other embodiments are also described and claimed.
37 Citations
13 Claims
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1. A machine-implemented method for providing a user with accuracy indications for a compass, comprising:
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calculating a plurality of instances of a geomagnetic field; calculating a plurality of instances of an average magnitude of a subset of the plurality of instances of the geomagnetic field; detecting whether said average magnitude changes by more than a first predetermined threshold; and informing the user that compass accuracy has degraded, in response to having detected that the average magnitude has changed by more than the first predetermined threshold. - View Dependent Claims (2, 3, 4, 5)
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6. A portable device comprising:
a portable device housing having integrated therein a magnetic sensor; a compass calibrator to compute a plurality of instances of a geomagnetic field based on an observed magnetic field and an estimated magnetic interference field; a compass accuracy indicator module to calculate a plurality of instances of an average magnitude of a subset of the plurality of instances of the geomagnetic field, and to detect whether the average magnitude changes by more than a predetermined threshold; and a user interface module coupled to drive one of a speaker and a display screen of the portable device, wherein the compass accuracy indicator module is to use the user interface module to inform a user of the portable device that compass accuracy has degraded in response to having detected that the average magnitude has changed by more than the predetermined threshold. - View Dependent Claims (7, 8, 9)
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10. An article of manufacture comprising:
a machine-readable medium having stored therein instructions that program a processor, of a portable device having an integrated magnetic sensor, to compute a plurality of instances of a geomagnetic field using the magnetic sensor, calculate a plurality of instances of an average magnitude of a subset of the plurality of instances of the geomagnetic field, detect whether the average magnitude changes by more than a predetermined threshold, and signal a user interface module of the portable device that compass accuracy has degraded in response to having detected that the average magnitude has changed by more than the predetermined threshold. - View Dependent Claims (11, 12, 13)
Specification