Electronic compass system

  • US 6,968,273 B2
  • Filed: 08/02/2002
  • Issued: 11/22/2005
  • Est. Priority Date: 03/01/2002
  • Status: Active Grant
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First Claim
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1. An electronic compass for a vehicle, comprising:

  • a magnetic sensor circuit for sensing three perpendicular components of the Earth'"'"'s magnetic field vector, and for generating output signals representing the three sensed components; and

    a processing circuit coupled to said magnetic sensor circuit for receiving the output signals, approximating a three-dimensional geometric pattern derived from the three sensed components, computing a heading of the vehicle as a function of at least two of the sensed components while referencing the three-dimensional geometric pattern, and generating a heading signal representing the computed heading, wherein said processing circuit approximates the three-dimensional geometric pattern based on at least five reference data points derived from the sensed components.

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