Influence of electrical parameters on UHF radio propagation in tunnels

Sun, Jun; Cheng, Lingfei; Liu, Xiaoyang

doi:10.1109/apcc.2004.1391730

Cited by 11 publications

(4 citation statements)

References 5 publications

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“…In most tunnels, the influence of conductivity can be neglected, since it is not sufficiently high [91]. As long as the dielectric constants of side walls, roof and floor are approximately equal, the attenuation rate of the vertically polarized mode is greater than that of the horizontally polarized mode as long as the tunnel width is larger than its height.…”

Section: B Electromagnetic Properties Of Tunnel Wallsmentioning

confidence: 99%

A Survey of Radio Propagation Modeling for Tunnels

Hrovat

Kandus

Javornik

2014

IEEE Commun. Surv. Tutorials

180

107

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Radio signal propagation modeling plays an important role in designing wireless communication systems. The propagation models are used to calculate the number and position of base stations and predict the radio coverage. Different models have been developed to predict radio propagation behavior for wireless communication systems in different operating environments. In this paper we shall limit our discussion to the latest achievements in radio propagation modeling related to tunnels. The main modeling approaches used for propagation in tunnels are reviewed, namely, numerical methods for solving Maxwell equations, waveguide or modal approach, ray tracing based methods and two-slope path loss modeling. They are discussed in terms of modeling complexity and required information on the environment including tunnel geometry and electric as well as magnetic properties of walls.

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Section: B Electromagnetic Properties Of Tunnel Wallsmentioning

confidence: 99%

A Survey of Radio Propagation Modeling for Tunnels

Hrovat

Kandus

Javornik

2014

IEEE Commun. Surv. Tutorials

180

107

View full text Add to dashboard Cite

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“…It is concluded that the optimum frequencies of electromagnetic waves in depending on the conductivity of the rock and the distance ranges are determined. The authors in [19] take a circular tunnel and a rectangular tunnel as examples, the influence of electrical parameters on UHF radio waves propagation are analyzed. The conclusion gives a reference for design the wireless communication system in tunnels.…”

Section: Introductionmentioning

confidence: 99%

Very Low Frequency Propagation Characteristics Analysis in Coal Mines

Zhang

Zhu

et al. 2020

IEEE Access

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Electromagnetic wave penetration coal-rock communication is a significant part for the smart mine communication technology, there are great challenges for electromagnetic wave is rapidly attenuated by factors such as geology and coal seam structure. In order to provide a theory basis for wireless communication technology development in coal rock, based on the Maxwell's equations, this paper establishes a physical model of wireless communication under the conditions of coal seam. To characterize the performance of the electromagnetic wave propagation, we use the Maxwell's equations to derive the exact expression of attenuation coefficient. Also, the parameters of coal and other factors affecting the electromagnetic wave propagation are analyzed and discussed. To further obtain more insights, the attenuation coefficient and skin depth of the very low-frequency (VLF) electromagnetic wave in coal medium with different degrees of metamorphism are studied, as well as the influence of resistivity. This provides scientific theoretical support for the application of VLF communication in coal mines. Finally, our theoretical analyses are verified by computer simulation, and the simulated numerical results show that: 1) The range of frequency of electromagnetic wave suitable for coal medium propagation is 3∼3KHz (VLF); 2) The order of the electromagnetic waves attenuation coefficient in coal with different degrees of metamorphism is: anthracite > lignite > fat coal > coking coal > lean coal, and the order of skin depth is: lean coal > coking coal > fat coal > lignite > anthracite; 3) The resistivity of coal has little effect on the attenuation of electromagnetic wave when VLF is used for communication. INDEX TERMS Coal medium, very low frequency (VLF), attenuation coefficient, wireless communication.

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“…With the change of tunnel environment, the communication channel model also changes. The study of [7] [8] shows that the shape, size, curve, embranchment and slope of tunnel greatly affect the electromagnetic wave transmission; these factors will all lead to the change of channel model. CR technology provides a feasible solution with its sensing ability of the environment and self-adaptive ability.…”

Section: Introductionmentioning

confidence: 99%

Study of Coal Mine Cognitive Radio Sensing Algorithm

Chen

Zhang

Ding

2009

2009 WASE International Conference on Information Engineering

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The present wireless communication system under coal mines is characterized by single pattern, fixed communication frequency, incapability of adaptive to various tunnel environments. To solve the above problems, cognitive radio is applied to the system. This paper focuses on the application of energy detection algorithms used in the spectrum sensing of various tunnels under mines. The detection probability of Rayleigh Channel and Rician Channel is analyzed, and the feedback joint detection algorithm based on the tunnel environment is put forward. The simulation shows that the probability of cooperative sensing system obviously rises with the method of self-adaptive through feedback information to adjust the node weight.

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Influence of electrical parameters on UHF radio propagation in tunnels

Cited by 11 publications

References 5 publications

A Survey of Radio Propagation Modeling for Tunnels

A Survey of Radio Propagation Modeling for Tunnels

Very Low Frequency Propagation Characteristics Analysis in Coal Mines

Study of Coal Mine Cognitive Radio Sensing Algorithm

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