Thesis-2000-Tillema.pdf (5.17 MB)

An investigation into underground navigation using electromagnetic waves

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thesis
posted on 10.07.2018, 09:11 by Nico J.P. Tillema
This thesis explores the possibility of measuring the movement of an underground transmitter using electromagnetic waves. The displacement of the transmitter was estimated based on the magnitude and phase of the received electromagnetic wave, using receiver antennas at fixed locations. Electromagnetic wave propagation underground was dependent on the frequency used, soil type, soil moisture content and environmental conditions. An extensive investigation has been conducted in measuring the soil dielectric constant and conductivity. When the sample moisture was increased, its dielectric constant increased, being disperse for clays, but fairly linear for sands. Clays show a higher conductivity. The optimum antennas to use underground were dielectric loaded electric monopole and dipole antennas. A method was developed to predict the admittance of insulated monopole antennas in soil using measured data of the ambient medium. [Continues.]

Funding

Great Britain, Department of Trade and Industry. Engineering and Physical Sciences Research Council (EPSRC) (DTI-Link project no.: GR/H 89104).

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Publisher

© Nico J.P. Tillema

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2000

Notes

A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy at Loughborough University.

Language

en

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Keywords

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