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Dynamic magnetic anomaly compensation

  • US 7,400,142 B2
  • Filed: 11/05/2004
  • Issued: 07/15/2008
  • Est. Priority Date: 11/06/2003
  • Status: Expired due to Fees
First Claim
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1. A system for dynamically compensating for magnetic anomalies due to the proximity of ferromagnetic objects or electric motors, comprising:

  • a parallelopiped;

    three-axis magnetometers each having three orthogonal axes, each of said magnetometers measuring magnetic field thereat and supplying a corresponding output, located at selected corners of said parallelopiped, said magnetometers having their three orthogonal axes aligned with the three orthogonal axes of the other magnetometers;

    a processor coupled to the outputs of said magnetometers to derive a magnetic anomaly gradient vector in terms of a difference in sensed magnetic field due to the presence of an anomaly; and

    ,an instrument for which heading is an output including a compass, said magnetic anomaly gradient vector coupled to said compass to compensate said compass for said magnetic anomalies.

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