Evaluation of a Semi-Airborne Electromagnetic Survey Based on a Multicopter Aircraft System

被引:8
|
作者
Kotowski, Philipp O. [1 ]
Becken, Michael [1 ]
Thiede, Anneke [1 ]
Schmidt, Volkmar [1 ]
Schmalzl, Joerg [1 ]
Ueding, Stefan [1 ]
Klingen, Stefan [1 ]
机构
[1] Univ Munster, Inst Geophys, Corrensstr 24, D-48149 Munster, Germany
关键词
semi-airborne electromagnetics; electrical resistivity; unmanned aircraft system; UAV; multicopter; INVERSION; SCHLEIZ;
D O I
10.3390/geosciences12010026
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
The semi-airborne electromagnetic (EM) method has the potential to reach deeper exploration depths than purely airborne EM approaches. The concept of the method is to deploy high-power transmitters on the ground, which excite subsurface currents and induce strong magnetic fields, and to measure the corresponding EM fields with a passive airborne receiver instrument. Following recent conceptual developments of the semi-airborne EM technique deployed on helicopters, we performed a 10 km2 semi-airborne EM survey near Munster (Germany) based on a multicopter aircraft system. For this purpose, horizontal electric dipole (HED) transmitters were installed in the survey area and were surveyed individually. Magnetic transfer functions were determined and a model of the conductivity of the study area was derived. Despite restrictions such as low payload capacity and multicopter-related EM noise, we were able to estimate spatially and spectrally consistent transfer functions of high quality up to a distance of 2 km from the respective transmitter. Our results could be validated with independent results from a magnetotelluric and a direct current sounding. The study demonstrates that an unmanned aircraft system (UAS) is suitable for semi-airborne EM application and that such a system can be beneficial where ground-based methods and manned techniques become impractical.
引用
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页数:18
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