Comparison of medium frequency propagation characteristics of a transmission line measured from both ends in a coal mine entry.
Li-J; Waynert-JA; Whisner-B; Damiano-NW
2014 IEEE Antennas and Propagation Society International Symposium, APSURSI 2014, United States. Washington, DC: IEEE Antennas and Propagation Society, 2014 Sep; :255-256
An underground coal mine medium frequency (MF) communication system generally couples its electromagnetic signals to a long conductor in a tunnel (entry). The entry plus the conductor acts as a transmission line (TL). Transceivers exchange signals along the line. The propagation characteristics of the TL, which is generally the longest signal path, play a major role in determining the system performance. In this paper, we present MF measurements of TL characteristics as measured from both ends of the TL in a coal mine entry. The characteristic impedances from both ends have some significant differences, but the other propagation parameters are very similar.
Mining-industry; Underground-mining; Communication-systems; Electromagnetic-wave-transmission; Signaling-systems; Noise-frequencies; Electric-power-transmission-lines; Electrical-conductivity; Sound-propagation; Performance-capability; Electrical-measurement; Noise-measurement; Electrophysiological-measurements; Coal-mining; Environmental-technology
2014 IEEE Antennas and Propagation Society International Symposium, APSURSI 2014, July 6 - 11, 2014, Memphis, Tenessee