Measurement of RF propagation in tunnels

Plass, Timothy; Jacksha, Ronald; Waynert, J. A.; Zhou, Chenming

doi:10.1109/aps.2013.6711461

Cited by 6 publications

(3 citation statements)

References 3 publications

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“…Note that the same assumption of grazing incidence has been made in both (13) and (14). The grazing incidence assumption is valid if the wavelength of interest is small compared to the tunnel transverse dimensions.…”

Section: Electric Field Polarized Predominantly In the Horizontal Dirmentioning

confidence: 99%

“…The spectrum analyzer's input was then switched back to the RX antenna and travel away from the transmitter was resumed. Post-processing of the logged data was performed to correlate the power nulls in the data to the pre-surveyed distances [14]. Figures 9 and 10 show a comparison between the measured and simulated power decay along the tunnel axial distance for the vertical and horizontal polarization cases, respectively.…”

Section: Attenuation Constant Measurementmentioning

confidence: 99%

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Attenuation Constants of Radio Waves in Lossy-Walled Rectangular Waveguides

Zhou¹,

Waynert²,

Plass³

et al. 2013

PIER

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Abstract-At the ultra-high frequencies (UHF) common to portable radios, the mine tunnel acts as a dielectric waveguide, directing and absorbing energy as a radio signal propagates. Understanding radio propagation behavior in a dielectric waveguide is critical for designing reliable, optimized communication systems in an underground mine. One of the major parameters used to predict the power attenuation in lossy waveguides is the attenuation constant. In this paper, we theoretically and experimentally investigate the attenuation constants for a rectangular waveguide with dielectric walls. We provide a new derivation of the attenuation constant based on the classic Fresnel reflection coefficients. The new derivation takes advantage of ray representation of plane waves and provides more insight into understanding radio attenuation in tunnels. We also investigate the impact of different parameters on the attenuation constant, including the tunnel transverse dimensions, permittivity, conductivity, frequency, and polarization, with an aim to find their theoretical optimal values that result in the minimum power loss. Additionally, measurements of the attenuation constants of the dominant mode at different frequencies (455, 915, 2450, and 5800 MHz) for a straight concrete tunnel are presented and compared to theoretical predictions. It is shown that the analytical results match the measured results very well at all four frequencies.

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Section: Electric Field Polarized Predominantly In the Horizontal Dirmentioning

confidence: 99%

Section: Attenuation Constant Measurementmentioning

confidence: 99%

Attenuation Constants of Radio Waves in Lossy-Walled Rectangular Waveguides

Zhou¹,

Waynert²,

Plass³

et al. 2013

PIER

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“…Propagation measurements were repeated for four frequencies (455 MHz, 915 MHz, 2.4GHz, and 5.8GHz) that are most common in wireless communication systems used in underground coal mines. More measurement details can be found in [20, 36]. …”

Section: Measurementmentioning

confidence: 99%

Time Domain and Frequency Domain Deterministic Channel Modeling for Tunnel/Mining Environments

Zhou¹,

Jacksha²,

Yan³

et al. 2017

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Understanding wireless channels in complex mining environments is critical for designing optimized wireless systems operated in these environments. In this paper, we propose two physics-based, deterministic ultra-wideband (UWB) channel models for characterizing wireless channels in mining/tunnel environments — one in the time domain and the other in the frequency domain. For the time domain model, a general Channel Impulse Response (CIR) is derived and the result is expressed in the classic UWB tapped delay line model. The derived time domain channel model takes into account major propagation controlling factors including tunnel or entry dimensions, frequency, polarization, electrical properties of the four tunnel walls, and transmitter and receiver locations. For the frequency domain model, a complex channel transfer function is derived analytically. Based on the proposed physics-based deterministic channel models, channel parameters such as delay spread, multipath component number, and angular spread are analyzed. It is found that, despite the presence of heavy multipath, both channel delay spread and angular spread for tunnel environments are relatively smaller compared to that of typical indoor environments. The results and findings in this paper have application in the design and deployment of wireless systems in underground mining environments.†

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Radio Propagation in Tunnels: Mini-Review and Future Trends

2021

2021 IEEE Asia-Pacific Conference on Applied Electromagnetics (APACE)

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Measurement of RF propagation in tunnels

Cited by 6 publications

References 3 publications

Attenuation Constants of Radio Waves in Lossy-Walled Rectangular Waveguides

Attenuation Constants of Radio Waves in Lossy-Walled Rectangular Waveguides

Time Domain and Frequency Domain Deterministic Channel Modeling for Tunnel/Mining Environments

Radio Propagation in Tunnels: Mini-Review and Future Trends

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