DYNAMIC COMPASS CALIBRATION IN A PORTABLE DEVICE
First Claim
Patent Images
1. A machine-implemented method for dynamic calibration of a compass in a portable device, comprising:
- monitoring the magnitude of a sensed magnetic field in the device as detected by the compass, over a given time interval;
monitoring one of position, orientation and movement (POM) data about the device using a position, orientation or movement (POM) sensor in the device;
comparing the monitored magnitude and POM data with predetermined criteria; and
signaling a recalibration of the compass based on the comparison.
2 Assignments
0 Petitions
Accused Products
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.
-
Citations
15 Claims
-
1. A machine-implemented method for dynamic calibration of a compass in a portable device, comprising:
-
monitoring the magnitude of a sensed magnetic field in the device as detected by the compass, over a given time interval; monitoring one of position, orientation and movement (POM) data about the device using a position, orientation or movement (POM) sensor in the device; comparing the monitored magnitude and POM data with predetermined criteria; and signaling a recalibration of the compass based on the comparison. - View Dependent Claims (2, 3, 4)
-
-
5. A portable device comprising:
-
a portable device housing having integrated therein a position, orientation or movement (POM) sensor to provide one of position, orientation and movement data (POM data) concerning the portable device, a magnetic sensor to provide a sensed, magnetic field, a compass calibrator coupled to the magnetic sensor, and an indicator module to monitor the magnitude of the sensed magnetic field and the POM data over a given time interval, compare the monitored magnitude and POM data with predetermined criteria, and, based on the comparison, signal the calibrator to recalibrate. - View Dependent Claims (6, 7, 8)
-
-
9. An article of manufacture comprising:
a machine-readable medium having stored thereon instructions that program a processor in a portable device to monitor the magnitude of a sensed magnetic field from a compass in the device over a given time interval, monitor one of position, orientation and movement data (POM data) from one of a position, orientation and movement sensor (POM sensor) in the device over the given time interval, compare the monitored magnitude with predetermined criteria, and signal a recalibration of a compass based on the comparison. - View Dependent Claims (10, 11, 12)
-
13. A machine-implemented method for dynamic calibration of a compass in a portable device, comprising:
-
monitoring a magnetic field surrounding the device during a given time interval; monitoring one or more of position, orientation, and movement (POM) of the device during the given time interval; comparing a change in the monitored magnetic field with a change in the monitored POM; and signaling a recalibration of the compass when the change in the monitored magnetic field is large relative to the change in the monitored POM. - View Dependent Claims (14, 15)
-
Specification