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Propagation of UHF radio waves in limestone room and pillar mines. Summary report.

Authors
Lagace-RL; Emslie-AG
Source
Washington, DC: U.S. Department of the Interior, Bureau of Mines, Contract J0377065, Contract J0387217, 1979 Jan; :1-43
NIOSHTIC No.
10002336
Abstract
This report presents a mathematical model for the propagation of UHF radio waves in the large cross section tunnels of a room-and-pillar limestone mine and describes the analysis of a small amount of propagation data obtained. The model and analysis is based on the waveguide mode theory, developed earlier for the transmission of UHF waves in coal mine tunnels, with allowance for propagation losses due to refraction into the tunnel walls. Propagation around corners and through pillars is also examined based on a ray theory approach together with the beneficial effects of placing reflectors at intersections to significantly reduce corner losses. The theory is found to be in fair agreement with the data; however, additional in- mine measurements are needed to provide a more conclusive test of the model.
Keywords
Models; Mining-industry; Mining-equipment; Underground-mining; Room-and-pillar-mining; Radio-waves; Radio Propagation-UHF; Tunnels; Tunnel Communications; Mines-Radio Communication; Mine Communication-Wireless; Mines-Limestone; Coal
Publication Date
19790101
Document Type
CP; Final Contract Report
Fiscal Year
1979
NTIS Accession No.
PB82-190547
NTIS Price
A04
Identifying No.
OFR 27-82; Contract-J0377065; Contract-J0387217
NIOSH Division
OD
Source Name
Washington, DC: U.S. Department of the Interior, Bureau of Mines, Contract J0377065, Contract J0387217
State
DC; MA
Performing Organization
Arthur D. Little, Inc.
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