Vehicle compass system with variable resolution

  • US 5,878,370 A
  • Filed: 12/01/1995
  • Issued: 03/02/1999
  • Est. Priority Date: 12/01/1995
  • Status: Expired due to Term
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First Claim
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1. An electronic compass system for use in a vehicle such as an automobile comprising:

  • sensing means for detecting the earth'"'"'s magnetic field and for providing electrical signals representative of the direction of the vehicle with respect to the earth'"'"'s magnetic field;

    circuit means coupled to said sensing means for resolving said direction representative electrical signals into a number of data points from which the detected direction of the vehicle may be calculated and providing heading output signals representing heading information corresponding to the detected direction; and

    an indicator coupled to said circuit means for providing an indication of the vehicle heading in response to said heading output signals,wherein said circuit means includes processing means responsive to the direction representative electrical signals for determining a relative field strength of the earth'"'"'s magnetic field and for varying the resolution at which said circuit means resolves the direction representative electrical signals into heading information as a function of the detected strength of the earth'"'"'s magnetic field to maintain a consistent degree of accuracy of the indicated heading information, wherein said processing means varies the resolution by adjusting the number of said data points into which said direction representative electrical signals can be resolved.

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