METHODOLOGY FOR HIGH-PRECISION MEASUREMENTS OF MAGNETIC FIELDS OF REMOTE RADIO TRANSMITTERS IN MOTION
D.V. Epishkin1,2, N.I. Zorin3, G.R. Muradyan4, A.G. Yakovlev4
1Geoelectromagnetic Research Center, Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences, Troitsk, Russia,
2STC Nord-West, Moscow, Russia,
3Center of Geophysics, Harbin Institute of Technology, Harbin, China,
4Department of Geology, Lomonosov Moscow State University, Moscow, Russia
Keywords: airborne electromagnetics, VLF-EM, RMT, UAV.
Abstract
The practical feasibility of high-precision measurements of magnetic fields from remote radio transmitters in motion, including on unmanned aerial vehicles, has been demonstrated. The method is based on measuring the Euclidean norm of the full complex magnetic field vector, which makes the results independent of the sensor system's orientation. To compensate for instabilities in the primary field, normalization is performed using a synchronized signal from a stationary base station. Additional accuracy is ensured through pre-flight sensor calibration and post-processing with spatial smoothing filters. Field tests confirmed good reproducibility, with discrepancies between repeated passes below 0.5% of the signal level. In addition, magnetic field maps obtained at different altitudes show strong internal consistency and correlate well with archived ground-based inductive electromagnetic survey data.
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