Abstract
Geomagnetic prospection is an efficient and environmentally friendly geophysical method for the analysis of the magnetic minerals’ distribution in the subsurface. High-resolution measurements require on-ground campaigns. However, these activities might imply high costs, risk and time consumption. Some more recent works have started to use magnetometers on-board remote piloted aircrafts. Normally, they fly at a constant altitude and use scalar probes. This configuration permits the determination of the magnitude of the magnetic field but not the direction, and requires advanced techniques for in-depth interpretation of the sources. In this manuscript, we describe the accommodation of a system for vector magnetometry in a drone whose flight altitude follows the elevation of the terrain. This singularity improves the capability of interpretation, including constraints in dating due to the record of the geomagnetic field. The work consists of the design, development and implementation of a solidary payload system anchored to the body of the platform in order to determine the vector magnetic field. It describes the details of the system and the performance characteristics obtained after the calibration, as well as its demonstration via a field campaign in the spatter deposits of Cerro Gordo volcano in Campos de Calatrava volcanic province in Spain.
Highlights
Magnetic surveys on planetary surfaces offer important information concerning the composition of exposed and unexposed rocks [1,2,3]
The DC and AC magnetic Remotely Piloted Aircrafts (RPAs) signatures were measured at INTA Space Magnetism facilities in order to calculate the minimum distance that should be between the sensor and the drone for a given noise level; Ad hoc design of the control electronics and acquisition of our payload, paying special attention to the materials used, the shielding of the cables and equipment and the filtering of the signal; Development of the necessary software tools and flight procedures to fly as low as possible and at constant altitude in the area of interest, with the best orientation and low speed to achieve the best measurement of the magnetic anomaly; Implementation of georeferenced data visualization tools with the capacity to perform post-processing with slight moving-average filtering
Even though the magnetic signature of the drone is minimized in the position of the file.sensor, At this point, other important aspects are the selection of the digital elevation models (DEM) and the tools used the planification of the routes will use one-direction tracks, in particular, North
Summary
Magnetic surveys on planetary surfaces offer important information concerning the composition of exposed and unexposed rocks [1,2,3]. The DC and AC magnetic RPA signatures were measured at INTA Space Magnetism facilities in order to calculate the minimum distance that should be between the sensor and the drone for a given noise level; Ad hoc design of the control electronics and acquisition of our payload, paying special attention to the materials used, the shielding of the cables and equipment and the filtering of the signal; Development of the necessary software tools and flight procedures to fly as low as possible and at constant altitude in the area of interest, with the best orientation and low speed to achieve the best measurement of the magnetic anomaly; Implementation of georeferenced data visualization tools with the capacity to perform post-processing with slight moving-average filtering.
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