Automatic calibration of a three-axis magnetic compass

Details Automatic calibration of a three-axis magnetic compass Automatic calibration of a three-axis magnetic compass

2006-08-09

2008-11-18

Bennett, G. Bradley (Department: 2841)

Geometrical instruments

Indicator of direction of force traversing natural media

Magnetic field responsive

C701S224000, C702S092000

Reexamination Certificate

active

07451549

ABSTRACT:
A magnetic compass apparatus and method to account for magnetic distortion while determining a magnetic heading is disclosed. The method enables a compass module, comprising at least two magnetometers, to characterize its magnetic environment dynamically, while collecting data of a geomagnetic field; a user moves an apparatus through various orientations; the environment may or may not contain magnetic distortion influences. Data gathered by magnetometers and, optionally, accelerometers are processed through at least two filters before being transferred as a processed data set for repetitive measurement calculations. A series of calculations is executed recursively in time by solving one or more linear vector equations using processed data.

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