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Loop coupling and field distribution in earth for horizontal positioning in VLF/ELF through-the-earth wireless mine communications.

Authors
Yan-L; Waynert-J; Sunderman-C
Source
2014 IEEE Antennas and Propagation Society International Symposium, APSURSI 2014, United States. Washington, DC: IEEE Antennas and Propagation Society, 2014 Sep; :247-248
NIOSHTIC No.
20045454
Abstract
A through-the-earth (TTE) wireless communication system is the system most likely to survive after a mine disaster because its signal penetrates the earth directly and does not use wires connecting the surface and underground components. Typically, the transmit (Tx) and receive (Rx) antennas are vertically separated by the earth overburden in a coaxial arrangement. In this paper, we show that there are advantages to separating the Tx and Rx antennas horizontally (co-planar arrangement), hence, communicating within the mine itself, and offering the advantage of mobility for one of the antennas. In this paper, we present a two-layer model, with both Tx loop and Rx loop antennas buried at the same depth underground. The magnetic field distribution results at the Rx loop are obtained for various conditions, such as earth conductivity, conductivity contrast between two layers, and co-planar and co-axis for the same Tx and Rx separation distance, providing us with an understanding of the parameters that control the performance and a concise method to predict the performance of a co-planar TTE loop communication system.
Keywords
Mining-industry; Underground-mining; Communication-systems; Signal-devices; Signaling-systems; Environmental-factors; Environmental-technology; Magnetic-fields; Equipment-reliability; Performance-capability; Models; Sound-propagation; Electrical-conductivity
CODEN
IAPSB
Publication Date
20140918
Document Type
Conference/Symposia Proceedings
Fiscal Year
2014
NTIS Accession No.
NTIS Price
ISBN No.
9781479935406
Identifying No.
M122014
ISSN
1522-3965
NIOSH Division
OMSHR
Priority Area
Mining
Source Name
2014 IEEE Antennas and Propagation Society International Symposium, APSURSI 2014, July 6 - 11, 2014, Memphis, Tenessee
State
PA; TN
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