Details:

Personal Author:
Stolarczyk, Larry G.
Corporate Authors:
A. R. F. Products, Inc. ; United States. Bureau of Mines.
A. R. F. Products, Inc. ; United States. Bureau of Mines. Less -
Description:
"This document describes the decision factors that bear on the selection of the modulation process for the wireless underground medium frequency (MF) communication system. The selected modulation process must satisfy the Bureau of Mines stated objective of improving general communications within an underground mine. The improvement being sought includes the development of a wireless communication technology of measurable benefit to both mine safety and mine productivity. The improvement will allow wireless communications paths to exist between roving miners. The wireless communication paths will also be made compatible with the existing underground telephone system to extend paging and voice communication throughout the underground mine. The new wireless equipment will include man-pack, vehicular, repeater, and base station transceivers. Repeaters and base stations will feature coupling networks for interfacing with the existing telephone circuits. Frequency modulation (FM) and single sideband (SSB) modulation processes are analyzed in view of the special conditions associated with underground mining. Of primary importance is the tremendous electrical noise generated in an operating mine that could adversely affect communications quality. High noise coupled with high attenuation rate of near field signals forces the communication system to be inherently short range. Fortunately, near field signals can propagate over great distances on underground wires and cables. The framework for comparison is generated by presenting all factors that bear on the problem. Then alternative modulation processes are considered in terms of the advantages and disadvantages of the factors as they bear on the problem. Finally, the best alternative modulation process is recommended for the wireless mine communication system." - NIOSHTIC-2

NIOSHTIC no. 20032697


Subjects:
[+]
Coal-mining Electromagnetic-energy Electromagnetic-fields Electromagnetic-interference Electromagnetic-radiation Metal-mining Mining-industry Nonmetal-mining Radio-waves Underground-mining
Document Type:
Report
Collection(s):
Stephen B. Thacker CDC Library collection
Main Document Checksum:
[+]
urn:sha256:57b78f83138b4efd37af0e9b3ebf392c1ec3d66ccffba32e6bb24467bc459d3f
Download URL:
https://stacks.cdc.gov/view/cdc/8516/cdc_8516_DS1.pdf
File Type:

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