1887
Volume 42, Issue 1
  • ISSN: 0812-3985
  • E-ISSN: 1834-7533

Abstract

As a check on calibration and drift in each discrete sub-system of a commercial frequency-domain airborne electromagnetic system, we aim to use causality constraints alone to predict in-phase from wide-band quadrature data. There are several possible applications of the prediction of in-phase response from quadrature data including: (1) quality control on base level drift, calibration and phase checks; (2) prediction and validation of noise levels in in-phase from quadrature measurements and vice versa and in future; and (3) interpolation and extrapolation of sparsely sampled data enforcing causality and better frequency-domain – time-domain transformations. In practice, using tests on both synthetic and measured Resolve helicopter-borne electromagnetic frequency domain data, in-phase data points could be predicted using a scaled Hilbert transform with a standard deviation between 40 and 80 ppm. However, relative differences between base levels between flight could be resolved to better than 1 ppm, which allows an independent quality control check on the accuracy of drift corrections.

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2011-03-01
2026-01-22

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/content/journals/10.1071/EG10017
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Dispersion constraints and the Hilbert transform for electromagnetic system response validation
Exploration Geophysics 42, 1 (2011); https://doi.org/10.1071/EG10017
/content/journals/10.1071/EG10017
/content/journals/10.1071/EG10017
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  • Article Type: Research Article
Keyword(s): calibration, dispersion, drift, electromagnetic, HEM, Hilbert transform, Kramers–Kronig.

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