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Quantifying the effects of transmitter-receiver geometry variations on the capabilities of airborne electromagnetic survey systems to detect targets of high conductance.

机译：量化收发器几何形状变化对机载电磁测量系统检测高电导目标能力的影响。

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摘要

The objectives of this thesis are to determine how the transmitter and the receiver move with respect to one another for various fixed-wing airborne EM systems; demonstrate why movement between the transmitter and the receiver compromises a system's ability to detect highly conductive targets; and estimate how accurately the transmitter-receiver geometry must be measured in order to detect a vertical target of high conductance for four configurations of airborne electromagnetic systems (GEOTEM, GEOTEM+, HeliGEOTEM and a Generic Concentric configuration). These objectives are achieved by analyzing the effect of the individual x, y, and z transmitter and receiver offsets, the transmitter attitude (roll, pitch, and yaw), and transmitter loop deformation.; The level of accuracy required for each geometric variation between the transmitter and the receiver is dependent on: the type, shape, orientation and depth of the target, as well as the configuration of the exploration system. For this analysis, the GEOTEM system is most sensitive to variations in the loop deformation followed by pitch, x-distance, z-distance, roll and y-distance. GEOTEM+ is similar to the GEOTEM system but is more sensitive to variations in pitch than loop deformation. The HeliGEOTEM system is most sensitive to variations in the pitch followed by loop deformation and z-distance then x-distance, roll and y-distance. The Generic Concentric system is most sensitive to loop deformation, z-distance, x- and y-distance, and roll and pitch. Of all the systems analyzed, the GEOTEM+ system has the lowest accuracy requirement followed by GEOTEM, HeltGEOTEM and the Generic Concentric. The Generic Concentric system requires an extremely high degree of accuracy for each variable. (Abstract shortened by UMI.)
机译：本文的目的是确定各种固定翼机载EM系统的发射器和接收器如何相对移动。演示为什么发射器和接收器之间的运动会损害系统检测高导电目标的能力；并估算必须如何精确测量发射机-接收机的几何形状，以检测机载电磁系统的四种配置（GEOTEM，GEOTEM +，HeliGEOTEM和通用同心配置）的高电导垂直目标。通过分析各个x，y和z发射器和接收器偏移，发射器姿态（横摇，俯仰和偏航）和发射器环路变形的影响，可以实现这些目标。发射器和接收器之间的每个几何变化所需的精度级别取决于：目标的类型，形状，方向和深度以及勘探系统的配置。对于此分析，GEOTEM系统对环变形，间距，x距离，z距离，侧倾和y距离的变化最敏感。 GEOTEM +与GEOTEM系统类似，但对音高变化的影响比对环路变形的敏感。 HeliGEOTEM系统对节距的变化最敏感，随后是环路变形和z距离，然后是x距离，侧倾和y距离。通用同心系统对回路变形，z距离，x和y距离以及横摇和俯仰最敏感。在所有分析的系统中，GEOTEM +系统具有最低的精度要求，其次是GEOTEM，HeltGEOTEM和通用同心。通用同心系统要求每个变量都具有极高的精度。 （摘要由UMI缩短。）

著录项

  • 作者

    Hefford, Shane W.;

  • 作者单位

    Carleton University (Canada).;

  • 授予单位 Carleton University (Canada).;
  • 学科 Geophysics.; Geotechnology.
  • 学位 M.Sc.
  • 年度 2006
  • 页码 166 p.
  • 总页数 166
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地球物理学;地质学;
  • 关键词

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