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| Titel |
Contribution to solving the orientation problem for an automatic magnetic observatory |
| VerfasserIn |
A. Khokhlov, J. L. Mouël, M. Mandea |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
2193-0856
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Instrumentation, Methods and Data Systems ; 2, no. 1 ; Nr. 2, no. 1 (2013-01-07), S.1-9 |
| Datensatznummer |
250000474
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| Publikation (Nr.) |
 copernicus.org/gi-2-1-2013.pdf |
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| Zusammenfassung |
| The problem of the absolute calibration of a vectorial (tri-axial)
magnetometer is addressed with the objective that the apparatus, once
calibrated, gives afterwards, for a few years, the absolute values of the
three components of the geomagnetic field (say the Northern geographical
component, Eastern component and vertical component) with an accuracy on the
order of 1 nT. The calibration procedure comes down to measure the
orientation in space of the three physical axes of the sensor or, in other
words, the entries of the transfer matrix from the local geographical axes to
these physical axes. Absolute calibration follows indeed an internal
calibration which provides accurate values of the three scale factors
corresponding to the three axes – and in addition their relative angles. The
absolute calibration can be achieved through classical absolute measurements
made with an independent equipment. It is shown – after an error analysis
which is not trivial – that, while it is not possible to get the axes
absolute orientations with a high accuracy, the assigned objective (absolute
values of the Northern geographical component, Eastern component and vertical
component, with an accuracy of the order of 1 nT) is nevertheless reachable;
this is because in the time interval of interest the field to measure is not
far from the field prevailing during the calibration process. |
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