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AssigneeJohnson Controls Technology Company
InventorsJeffrey N. Parks, Thomas R. Olson, David J. Slater
Estimating the term…
The compass system of the present invention utilizes an improved calibration route in which a processing circuit of the compass recalibrates the compass each time three data points are obtained from a magnetic field sensor that meet predetermined criteria. One such criterion is that the three data points define corners of a triangle that is substantially non-obtuse. When three data points have been obtained that define a triangle meeting this criterion, the processing circuit calculates a center point for a circle upon which all three data points lie by solving the equation x2+y2+Ax+By+C=0 for A, B, and C, using the coordinate values (x,y) for the three data points and defining the center point as (−A/2, −B/2).
A compass system configured to operate with a magnetic field sensor configured to provide magnetic field data in response to Earth's magnetic field and a global position system configured to receive position data from a positioning satellite, the compass system comprising:
A compass system, comprising:
A compass system mounted in a vehicle a display configured to provide a heading output data, comprising:
Dependencies are inferred from the claim text.