Distortion-immune position tracking using redundant magnetic field measurements
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United States of America Patent
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Dec 20, 2011
Grant Date -
Feb 7, 2008
app pub date -
Aug 7, 2006
filing date -
Aug 7, 2006
priority date (Note) -
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Abstract
A method for tracking a position of an object includes using a field sensor associated with the object to measure field strengths of magnetic fields generated by two or more field generators, wherein a measurement of at least one of the field strengths is subject to a distortion. Rotation-invariant location coordinates of the object are calculated responsively to the measured field strengths. Corrected location coordinates of the object are determined by applying to the rotation-invariant location coordinates a coordinate correcting function so as to adjust a relative contribution of each of the measured field strengths to the corrected location coordinates responsively to the distortion in the measured field strengths.
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