TY - JOUR
T1 - An integrated processing scheme for high-resolution airborne electromagnetic surveys, the SkyTEM system
AU - Auken, Esben
AU - Christiansen, Anders Vest
AU - Westergaard, Joakim H.
AU - Kirkegaard, Casper
AU - Foged, Nikolaj
AU - Viezzoli, Andrea
PY - 2009
Y1 - 2009
N2 - The SkyTEM helicopter-borne transient electromagnetic system was developed in 2004. The system yields unbiased data from 10 to 12s after transmitter current turn-off. The system is equipped with several devices enabling a complete modelling of the movement of the system in the air, facilitating excellent high-resolution images of the subsurface. An integrated processing and inversion system for SkyTEM data is discussed. While the authors apply this system with SkyTEM data, most of the techniques are applicable for airborne electromagnetic data in general. Altitude data are processed using a simple recursive filtering technique that efficiently removes reflections from trees. The technique is completely general and can be used to filter altitude data from any airborne system. Raw voltage data that are influenced by electromagnetic coupling to man-made structures are culled from the dataset to avoid uncoupled data being distorted by coupled data, and geometrical corrections are applied to correct for pitch and roll of the transmitter frame. Data are de-spiked and averaged using trapezoid-shaped filter kernels. A Laterally Constrained Inversion using smooth models is actively used to evaluate the processing, and the final inversion is tightly connected to the processing procedures.
AB - The SkyTEM helicopter-borne transient electromagnetic system was developed in 2004. The system yields unbiased data from 10 to 12s after transmitter current turn-off. The system is equipped with several devices enabling a complete modelling of the movement of the system in the air, facilitating excellent high-resolution images of the subsurface. An integrated processing and inversion system for SkyTEM data is discussed. While the authors apply this system with SkyTEM data, most of the techniques are applicable for airborne electromagnetic data in general. Altitude data are processed using a simple recursive filtering technique that efficiently removes reflections from trees. The technique is completely general and can be used to filter altitude data from any airborne system. Raw voltage data that are influenced by electromagnetic coupling to man-made structures are culled from the dataset to avoid uncoupled data being distorted by coupled data, and geometrical corrections are applied to correct for pitch and roll of the transmitter frame. Data are de-spiked and averaged using trapezoid-shaped filter kernels. A Laterally Constrained Inversion using smooth models is actively used to evaluate the processing, and the final inversion is tightly connected to the processing procedures.
KW - Airborne electromagnetic
KW - Altitude processing
KW - Constrained inversion
KW - SkyTEM.
UR - http://www.scopus.com/inward/record.url?scp=67949109633&partnerID=8YFLogxK
U2 - 10.1071/EG08128
DO - 10.1071/EG08128
M3 - Article
SN - 0812-3985
VL - 40
SP - 184
EP - 192
JO - Exploration Geophysics
JF - Exploration Geophysics
IS - 2
ER -