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Mining Publication: Theoretical Noise and Propagation Models for Through-the-earth Communication
Keywords: Communications Modeling Noise Through-the-earth communications systems
This page is archived for historical purposes and is no longer being maintained or updated. Contact NIOSH Mining if you need an accessible version.
Original creation date: September 1982
Authors: DA Hill, JR Wait
Contract/MOA Report - September 1982
Download PDF Document (0.87 MB)
NIOSHTIC2 Number: 10003392
National Telecommunications & Information Admin., Institute for Telecommunication Sciences U.S. Bureau of Mines contract No. J0113058. NTIS: PB84-166628, 1982; Sept :52 pages
A survey of the literature on ELF and VLF atmospheric noise has been made. Most measurements have concentrated on the vertical electric field and the horizontal magnetic field rather than the vertical magnetic field which is of interest in transmission between horizontal loops. The limited vertical magnetic field data indicates that the vertical component is generally 10 to 20 dB below the horizontal component. Three laterally inhomogeneous earth models have been analyzed for conversion of horizontal to vertical magnetic field. The rough surface model examines surface effects, the inhomogeneous thin sheet model treat volume effects, and the buried cylinder model treats localized man-made effects. All three models predict the possibility of significant conversion from horizontal to vertical magnetic field. A thin sheet model has also been used to examine transmission from a buried magnetic dipole source. It found that the predicted fields more nearly model the measured data than does the homogeneous half-space model.
Image of publication Theoretical Noise and Propagation Models for Through-the-earth CommunicationContract/MOA Report - September 1982
Download PDF Document (0.87 MB)
NIOSHTIC2 Number: 10003392
National Telecommunications & Information Admin., Institute for Telecommunication Sciences U.S. Bureau of Mines contract No. J0113058. NTIS: PB84-166628, 1982; Sept :52 pages
See Also
Communication Systems Research At Bruceton Safety Research Mine
Experience with an Integrated, Computer-Controlled Communications and Monitoring System at the Robena Mine
Propagation of EM Signals in Underground Mines
Research and Development Contract for Coal Mine Communication System: Volume 3 - Theoretical Data Base
Technology News 551 - Through-the-Earth, Post-Accident Communications - an Emerging Technology - TN-No. 551
Through-the-Earth Communication Systems for Underground Coal Mines: Product Final Development and Standardized Interface Definition
Through-The-Earth Wireless Real-Time Two-Way Voice Communications
Ultra-Low Frequency Through-the-Earth Communication Technology
Vertical Magnetic Noise in the Voice Frequency Band Within and Above Coal Mines
Wireless Through-The-Earth Modeling and Support
Page last reviewed: September 21, 2012
Page last updated: September 21, 2012
Content source: National Institute for Occupational Safety and Health, Mining Program
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