The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 02, 1997
Filed:
Jun. 28, 1995
Jean-Louis Lescourret, Meriguec, FR;
Sextant Avionique, Meudon La Foret, FR;
Abstract
The disclosure relates to a method of compensation of perturbations of magnetic field measurements made by a sensor (C) caused by sources of perturbation (S.sub.1, S.sub.2, S.sub.3, . . . S.sub.k) attached to the sensor. The method utilizes a first stage that expresses the perturbation caused by each of the sources, that are situated in any given ambient magnetic field, as an explicit function of the average magnetic field at the position of the source so as to build a model that can be used to calculate its perturbation at the center of the sensor, a second stage, said sensor being located in the magnetic field to be measured, to determine the perturbation caused by each of the sources of perturbation by using its model and knowing the average magnetic field at this position, a third stage that sums the perturbations of all the sources of perturbation, and a fourth stage that subtracts this sum from the measurement made by the sensor. The invention is applicable to systems requiring precise measurement of a magnetic field, notably in the case of the determination of the position and orientation of aircraft pilot helmet aiming devices.