Electricity: measuring and testing – Magnetic – Displacement
Patent
1995-06-28
1997-12-02
Snow, Walter E.
Electricity: measuring and testing
Magnetic
Displacement
324225, 36457101, G01B 714, G01D 520, F41G 322, G06F 1550
Patent
active
056940416
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.
REFERENCES:
patent: 3697869 (1972-10-01), Greenberg et al.
patent: 4287809 (1981-09-01), Egli et al.
patent: 4394831 (1983-07-01), Egli et al.
patent: 5126669 (1992-06-01), Honess et al.
Sextant Avionique
Snow Walter E.
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