Radio Wave Propagation in Arched Cross Section Tunnels – Simulations and Measurements

Masson, Émilie; Combeau, Pierre; Berbineau, Marion; Vauzelle, Rodolphe; Pousset, Yannis

doi:10.4304/jcm.4.4.276-283

Cited by 35 publications

(20 citation statements)

References 13 publications

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“…Instead of using conventional FDTD method if we use S-FDTD and S-ADI-FDTD methods, it reduces computational time and memory. In second example, we consider the Roux tunnel in Ardeche region France studied in the published work of E. Masson [5]. This tunnel is perfectly straight and has a length of 3.336 km ( Fig.…”

Section: Numerical Analysismentioning

confidence: 99%

Segmentation technique with ADI-FDTD for EM propagation modeling in electrically large structure

Rana

Anwar

Motin

2014

2014 International Conference on Electrical Engineering and Information &Amp; Communication Technology

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This paper deals with the electromagnetic (EM) wave propagation modeling in complex tunnel environments. We propose a novel segmented alternating direction implicit finite difference time domain (S-ADI-FDTD) method for modeling the electromagnetic wave propagation inside an electrically large tunnel. The proposed S-ADI-FDTD method reduces the computational redundancy by dividing the problem space into segments. It also allows use of larger cells in each segment. To validate this method, we simulate the propagation in real tunnels and compare the results with the published experimental data. The comparisons reveal that the proposed S-ADI-FDTD method can predict the fields most accurately in real, large tunnels at longer ranges.

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Section: Numerical Analysismentioning

confidence: 99%

Segmentation technique with ADI-FDTD for EM propagation modeling in electrically large structure

Rana

Anwar

Motin

2014

2014 International Conference on Electrical Engineering and Information &Amp; Communication Technology

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“…This simulator has been validated in the case of a rectangular straight tunnel in [40] by comparison with [41]. However, the complexity and the computation time of such a method grow in an exponential way with the number of facets composing the scatters, and the considered number of electromagnetic interactions.…”

Section: Ray Tracing Simulatormentioning

confidence: 99%

Study of Propagation Mechanisms in Dynamical Railway Environment to Reduce Computation Time of 3D Ray Tracing Simulator

Hairoud

Combeau

Pousset

et al. 2013

International Journal of Antennas and Propagation

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In order to better assess the behaviours of the propagation channel in a confined environment such as a railway tunnel for subway application, we present an optimization method for a deterministic channel simulator based on 3D ray tracing associated to the geometrical optics laws and the uniform theory of diffraction. This tool requires a detailed description of the environment. Thus, the complexity of this model is directly bound to the complexity of the environment and specifically to the number of facets that compose it. In this paper, we propose an algorithm to identify facets that have no significant impact on the wave propagation. This allows us to simplify the description of the geometry of the modelled environment by removing them and by this way, to reduce the complexity of our model and therefore its computation time. A comparative study between full and simplified environment is led and shows the impact of this proposed method on the characteristic parameters of the propagation channel. Thus computation time obtained from the simplified environment is 6 times lower than the one of the full model without significant degradation of simulation accuracy.

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“…Specifically, in [9] a complete analysis about propagation in tunnels and mines is presented, which takes into account factors such as the operat ing frequency, size of the tunnel, antenna polarization, and the electrical parameters. In [10], the authors study the influence of the tunnel geometry, while [11] analyzes propagation in tunnels with varying cross-section.…”

Section: Introductionmentioning

confidence: 99%

Transversal fading analysis in straight tunnels at 2.4 GHz

Rizzo

Lera

Villarroel

2013

2013 13th International Conference on ITS Telecommunications (ITST)

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In tunnel-like environments the electromagnetic waves propagate differently in comparison to free space and urban scenarios. This is because, depending on the working frequency, tunnels can act as waveguides. As a consequence of this some specific phenomena occur, such as fast and slow fadings, caused by the constructive and destructive interference due to the multi path propagation. Fadings along the longitudinal dimension of tunnels have been widely studied under different geometric conditions, antenna polarization and working frequen cies. Nevertheless, fadings also take place in the transversal dimension or cross-section. This issue has been poorly treated in the literature. In this context, our research group has been investigating navigation algorithms for multi-robot teams in tunnel-like environments under communication constraints. As fadings affect the communication among robots, a study about this phenomenon is necessary. In this work we present a complete study about transversal fadings in the Somport tunnel at 2.4 GHz. Results after carrying out a measuring campaign are presented and compared to modal theory based calculations, showing that fadings present a similar behavior in each transversal half of the tunnel (with the same period and phase, and with a phase delay between both halves) but different in the center, where although no deep fadings appear, the mean value of the signal power is lower compared to the fadings maximums. This led us to define a comfort-zone for communications for robot navigation in tunnels.

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Radio Wave Propagation in Arched Cross Section Tunnels – Simulations and Measurements

Cited by 35 publications

References 13 publications

Segmentation technique with ADI-FDTD for EM propagation modeling in electrically large structure

Segmentation technique with ADI-FDTD for EM propagation modeling in electrically large structure

Study of Propagation Mechanisms in Dynamical Railway Environment to Reduce Computation Time of 3D Ray Tracing Simulator

Transversal fading analysis in straight tunnels at 2.4 GHz

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