UAV-Based Vector Magnetic Survey System
A. Karinen, M. Pirttijarvi and A. Saartenoja
Event name: First EAGE Workshop on Unmanned Aerial Vehicles
Session: UAV Magnetic Surveys
Publication date: 02 December 2019
Info: Extended abstract, PDF ( 6.24Mb )
Price: € 20
We present a method and preliminary results from a UAV-based vector magnetic survey system. The key element is an accurate inertial measurement unit (IMU) that measures the orientation of the UAV platform. Equivalent layer modelling and numerical optimization is then used to find out the angular (roll, pitch, yaw) difference between the coordinate systems of the IMU and the fluxgate (FG) magnetometer installed rigidly into the tail boom of a fixed-wing UAV. Once the true orientation of the FG sensor is known, the components of the measured magnetic field are rotated to the geographical coordinate system. The vector magnetic field, i.e., the XYZ components of the magnetic field provide useful information for magnetic data interpretation. We present an example illustrating how the direction of the magnetization can obtained from 3-component magnetic data by numerical inversion. Based on the example, 3D inversion of vector magnetic data helps identifying remnant magnetization, for example.