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Process for compensating the magnetic disturbances in the determination of a magnetic heading, and devices for carrying out this process

  • US 4,414,753 A
  • Filed: 06/04/1981
  • Issued: 11/15/1983
  • Est. Priority Date: 06/05/1980
  • Status: Expired due to Term
First Claim
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1. A device for compensating the magnetic disturbances influencing the measurements of a device which determines a magnetic heading on board a land vehicle comprising a magnetometer for furnishing analog voltages proportional to the components of the disturbed magnetic field of the earth, along reference axes of the magnetometer, a memory of a computer module associated with the magnetometer for receiving so-called compensation coefficients, which make it possible to correct the information delivered by the magnetometer to obtain the real heading, wherein the device further comprises:

  • means for identifying a closed plane geometrical figure described by an end of a first vector Hhp indicative of the disturbed magnetic field when the vehicle rotates on itself through 360°

    on a horizontal plane;

    means for transforming this closed geometrical figure into a circle of any radius centered on the origin of the reference axes of the magnetometer and representing the locus of an end of a second vector Hh representative of the non-disturbed magnetic field, andmeans for calculating the coefficients serving to define the correspondence between all the points of said closed geometrical figure and their homologues on said circle.

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