METHOD FOR CORRECTING ERROR IN MEASUREMENT OF MAGNETOMETER AND APPARATUS THEREFOR

Title:

METHOD FOR CORRECTING ERROR IN MEASUREMENT OF MAGNETOMETER AND APPARATUS THEREFOR

Document Type and Number:

Japanese Patent JP3734868

Kind Code:

B2

Abstract:

PROBLEM TO BE SOLVED: To correct error in the measurement due to magnetic perturbation and positional mismatch of magnetometer easily, quickly and accurately by introducing a measurement of field, a time derivative thereof and a perturbation field into a logic model for error correction and determining coefficients.
SOLUTION: When a transporting machine 3 is being steered, a value of field on the reference coordinates R1 measured through a magnetometer 2 and a field Hm' variable as a function of angular position dependent on the advancing direction and attitude are introduced into a theoretic model for correcting the error of magnetometer 2, Hc=[A].Hm+[T].Hm'+Hp, thus determining a corrected field Hc. In the formula, A represents a matrix due to soft iron perturbation and positional mismatch having no restriction on the angular value, T represents a matrix taking account of the delay between the attitude and advancing direction or the limit of passing band of magnetometer 2, and Hp represents a perturbation field. Since the field Hc can be regarded as a geomagnetic reference coordinates R2 projected onto coordinates R1, error can be corrected by fixing coefficients for minimizing the error between the effective field value H and a field Hc on the coordinates R2.

Inventors:

Eric Charles Asu
Jean-Paul Petillon

Application Number:

JP32898695A

Publication Date:

January 11, 2006

Filing Date:

December 18, 1995

Export Citation:

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