METHOD FOR CALIBRATING A MAGNETOMETRIC SENSOR, BASED ON PRECISE MEASUREMENT OF CHANGES IN ITS SPATIAL POSITION IN A CONSTANT MAGNETIC FIELD
M. A. Raifeld1, A. N. Vasilevskiy2,3, A. N. Galyantich1,4
1Novosibirsk State Technical University, Novosibirsk, Russia
2Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
3Novosibirsk State University, Novosibirsk, Russia
4JSC "PO UOMZ Ural-SibNIIOS", Novosibirsk, Russia
Keywords: fluxgate magnetometer, calibration, theodolite, non-orthogonality matrix, sensitivity matrix, rotation matrix, eigenvalues and vectors, residual
Abstract
Magnetometric measurements are widely used to solve problems in geology, navigation, and a number of other areas. Currently, there is a tendency to miniaturize and reduce the cost of magnetometers. However, the readings of inexpensive magnetometers are distorted by errors, which requires a calibration procedure. The article describes mathematical error models that are used in most well-known scientific research and adopted in this work. Mathematical modeling of the measuring signals of the magnetometer is carried out, and the principle of calibration of the magnetometric sensor, based on the accurate measurement of changes in its spatial position in a constant magnetic field, is proposed and researched. Estimates are given of the accuracy of restoration of calibrated parameters and the signal restoration errors achievable when performing the calibration operations proposed in the study.
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