Airborne Transient Electromagnetic Modeling and Inversion Under Full Attitude Change

During airborne transient electromagnetic (EM) surveys, transmitting and receiving antennas change their attitudes as the inevitable result of pilot maneuvers and natural forces, which makes the EM response different from that of the nominal attitudes when the antennas are straight and level. Attitu...

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Bibliographic Details
Published in:IEEE geoscience and remote sensing letters 2017-09, Vol.14 (9), p.1575-1579
Main Authors: Qi, Youzheng, Huang, Ling, Wang, Xucun, Fang, Guangyou, Yu, Gang
Format: Article
Language:English
Subjects:
Airborne time-domain electromagnetic (EM) system
Antennas
Atmospheric modeling
Attitude change
attitude effect
Attitudes
Coils
Earth
Geoelectricity
Inversion
Maneuvers
Matrix converters
Modelling
Parameter estimation
Receiving antennas
rotation matrix
Surveys
tikhonov regularization
Time response
transient EM (TEM) method
Transmitting antennas
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Summary:During airborne transient electromagnetic (EM) surveys, transmitting and receiving antennas change their attitudes as the inevitable result of pilot maneuvers and natural forces, which makes the EM response different from that of the nominal attitudes when the antennas are straight and level. Attitude changes were usually neglected or partially considered in the past, which are not adequate for a quantitative interpretation. In this letter, we first scrutinize the mechanism of how the attitude change affects the EM response and divides these effects into two parts: the pure attitude effect and the resultant translation effect. Then, we introduce a novel method to involve the full attitude change in both modeling and inversion. Our compelling results finally demonstrate that the attitude change affects the early-time response much more than the late time and involving the full change in inversion can produce a better estimate of shallow geoelectric parameters.
ISSN:1545-598X
1558-0571
DOI:10.1109/LGRS.2017.2724558