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MAGNETIC FIELD COMPENSATION SYSTEM AND METHOD THEREOF

  • US 20140107860A1
  • Filed: 10/15/2013
  • Published: 04/17/2014
  • Est. Priority Date: 10/15/2012
  • Status: Active Grant
First Claim
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1. A compass system for a vehicle comprising:

  • magnetic sensors mounted in the vehicle for sensing directional components of the Earth'"'"'s magnetic field vector, wherein each of said magnetic sensors output signals representing a sensed component of the Earth'"'"'s magnetic field along with components of any electromagnetic noise;

    a processing circuit coupled to said magnetic sensors for receiving the output signals, said processing circuit being programmed to execute the steps comprising;

    computing a first average of the output signals,determining whether a source of electromagnetic interference has been activated,computing a first calibration point responsive to the output signals,when a source of electromagnetic interference has been activated, computing second average of the output signals acquired after activation of the source of electromagnetic interference, computing a difference between the second average of the output signals from the first average to compute an offset vector, and computing a second calibration point by offsetting the first calibration point by the offset vector, andcomputing a heading of the vehicle using the most recently acquired output signals and one of the first calibration point and the second calibration point and generating a heading signal indicative of the heading; and

    a heading indicator coupled to said processing circuit for receiving the heading signal and for indicating the heading to a driver of the vehicle.

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