L-3 Communications, a division of Global Security and Engineering Solutions reports that recent testing has found that a frequency of 900 megahertz provided a high level of reliable, clear and audible communication throughout all areas of a mine, even around corners deep in a mine.
In tests conducted at the International Coal Group's Sentinel Mine in Philippi, W.V., it was found that the frequency "provides the best propagation distance for communication around corners and around crosscuts.
The project is part of a research and development contract for the National Institute for Occupational Safety and Health.
Miners carry radios that provide them with voice and data communications and give data on the miners' location. The radio signals are transmitted through "fixed mesh nodes" that send the signal to "gateway nodes" that are outside the mine, above ground. A mine operations center, also located above ground, monitors the network and tracks the position of all personnel within the mine.
Click on the links for reports from the Deseret Morning News and the Salt Lake Tribune.
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Saturday, January 5, 2008
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