Coil Attitude Influence and Attitude Correction Method for Frequency Domain Airborne Electromagnetic System
Wang Weiping
Zeng Zhaofa
Wu Chengping
Abstract：Coils attitude influence and attitude corrections method for frequency domain airborne electromagnetic system are pio-neering jobs in frontiers without much experience.The coils of towed helicopter frequency airborne electromagnetic method are mounted in a bird,coils attitude changes a lot relatively,so attitude corrections improve the precision of data processing.It is important to impove data processing level for airborne electromagnetic method.Attitude variations of helicopter bird frequency electromagnetic system transmitting and receiving coils,result in electromagnetic data error which is produced by underground geologic body and received by the electromagnetic sensor.Analog computation is used in this study to work out the frequency domain airborne electromagnetic response by 3D frequency domain finite difference method.The response of horizontal co-plane and vertical coaxial systems from different frequencies and different types of sensor rotation is analyzed.The results show that the measurement error from vertical coaxial system is greater than that of horizontal co-plane system.The measurement error caused by the change of rotation angles is more remarkable than higher frequencies.The vertical coaxial system is mainly affect-ed by pitch rotation,whereas the horizontal co-plane system is mainly affected by roll and pitch rotation,and the latter has great influence in the same rotation angle.On the basis of previous work of calibrating attitude error,this paper effectively wipes out response error from attitude changing of coils.
Keywords：frequency airborne electromagnetic methodcoil attitudefrequency domain finite difference methodattitude cor-rectiongeophysics
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 1266-1275 )