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Noise removal method for an electronic compass

  • US 5,323,336 A
  • Filed: 12/27/1991
  • Issued: 06/21/1994
  • Est. Priority Date: 12/27/1991
  • Status: Expired due to Term
First Claim
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1. A method for noise and outliers from data values for an electronic compass, said method comprising:

  • (a) orienting first and second sense coils of a flux-gate sensor perpendicular to each other in the earth'"'"'s magnetic field;

    (b) saturating said sense coils with a drive signal;

    (c) measuring an induced voltage in said sense coils induced by said magnetic field;

    (d) calculating a first heading related to said induced voltage using a processing unit and storing said first heading in a memory unit connected to said processing unit;

    (e) calculating and storing a second heading related to said induced voltage using said processing and memory units;

    (f) calculating and storing a third heading related to said induced voltage using said processing and memory units;

    (g) determining a median heading of said three stored heading using said processing unit;

    (h) displaying said median heading on a display unit when a currently displayed heading is less than said third stored heading and a last displayed heading is greater than said second stored heading;

    (i) displaying said median heading on said display unit when said currently displayed heading is greater than said third stored heading and said last displayed heading is less than said second stored heading;

    (j) displaying said third stored heading when said currently displayed heading is less than said third stored heading and said last displayed heading is less than said second stored heading; and

    (k) displaying said third stored heading when said currently displayed heading is greater than said third stored heading and said last displayed heading is greater than said second stored heading,wherein by selecting one of said median heading and said third stored heading for display using steps (h), (i), (j), and (k), noise and outliers are removed from said data values.

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