Results 1 - 10 of 32

• Basic Tutorial on Wireless Communication and Electronic Tracking: Technology Overview
  2/6/2013 - Training materials
  This tutorial provides a brief overview of CT systems intended to meet the needs of people who require a basic understanding of the distinguishing features and operations of different CT systems.
• Theory on the Propagation of UHF Radio Waves in Coal Mine Tunnels
  3/1/1975 - Peer reviewed journal articles
  The theoretical study of UHF radio communication in coal mines, with particular reference to the rate of loss of signal strength along a tunnel, and from one tunnel to another around a corner is the concern of this paper. This work was part of an invest...
• Leaky Feeder Mine Communications System
  2/24/2023 - Contracts and cooperative agreements
  A contract to investigate techniques to increase the survivability of leaky feeder communication systems.
• Measurement of the Influence of Antennas on Radio Signal Propagation in Underground Mines and Tunnels
  10/4/2019 - Peer reviewed journal articles
  This paper reports the influence of antennas on radio signal propagation in tunnels and underground mines.
• Electromagnetic Noise Data Acquisition for the Evaluation of TTE Communications in Coal Mines
  4/8/2019 - Contracts and cooperative agreements
  A contract to improve the performance of TTE radio systems intended for use in coal mine emergency communications between the mine and the surface.
• Data Transport Over Leaky Feeder Systems Using Internet-Protocol-Enabled Land Mobile Radios
  3/5/2019 - Peer reviewed journal articles
  An article presenting the selection, configuration and testing methodologies employed by NIOSH researchers to integrate commercially available land mobile data radios into an existing leaky feeder communication system to provide IP data transport.
• Ray Tracing and Modal Methods for Modeling Radio Propagation in Tunnels With Rough Walls
  5/1/2017 - Peer reviewed journal articles
  An article that discusses how wall roughness affects radio propagation in tunnels, and presents a unified ray tracing and modal method for modeling radio propagation in tunnels with rough walls.
• Communications and Tracking Systems Modeling and Performance
  3/13/2017 - Research projects
  A project to enhance the understanding of underground mining communication and tracking system performance through the development and validation of radio signal propagation models.
• Mine Communications Engineering and Compatibility Guidelines
  7/19/2016 - Contracts and cooperative agreements
  A contract to ensure that the limited useful spectrum is used efficiently, health and safety hazards are not introduced, and new systems do not interfere with each other or with older systems already in place.
• Medium Frequency Radio System Modifications for Refuge Chamber Situational Awareness
  7/19/2016 - Contracts and cooperative agreements
  A contract to modify medium frequency radio systems to improve refuge chamber situational awareness in an underground coal mine.