Comparative Study of Computational Electromagnetics Applied to Radiowave Propagation in Wildfires

Faria, Stefânia; Vala, Mário; Coimbra, Pedro; Felício, João; Leonor, Nuno; Fernandes, Carlos; Salema, Carlos; Caldeirinha, Rafael

http://hdl.handle.net/10400.8/14077

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Comparative Study of Computational Electromagnetics Applied to Radiowave Propagation in Wildfires.pdf	In this paper, a comparative study of four computational electromagnetic techniques to model the 2-dimensional radiowave propagation phenomena in wildfires, is proposed. The fire dynamics for a small tree specimen is studied, in which gases released from the combustion process are used to investigate the generation of an ionised plasma and, thus, to evaluate the gradient of the medium refractive index using the cold plasma model. Consequently, the presence of fire has been demonstrated to introduce additional losses in the radio path that may be critical to radio communication systems that are widely used in mission critical applications. The gradient of the refractive index across the vegetation volume yielded by the cold plasma model is used as input parameter to different numerical methods and electromagnetic solvers at 385 MHz (i.e. TETRA frequency band in Portugal) and, subsequently, their applicability to wildfires is assessed.	446.53 KB	Adobe PDF	Download

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Abstract(s)

In this paper, a comparative study of four computational electromagnetic techniques to model the 2-dimensional radiowave propagation phenomena in wildfires, is proposed. The fire dynamics for a small tree specimen is studied, in which gases released from the combustion process are used to investigate the generation of an ionised plasma and, thus, to evaluate the gradient of the medium refractive index using the cold plasma model. Consequently, the presence of fire has been demonstrated to introduce additional losses in the radio path that may be critical to radio communication systems that are widely used in mission critical applications. The gradient of the refractive index across the vegetation volume yielded by the cold plasma model is used as input parameter to different numerical methods and electromagnetic solvers at 385 MHz (i.e. TETRA frequency band in Portugal) and, subsequently, their applicability to wildfires is assessed.

Description

Article number - 9232369; Conference date - 29 August 2020 - 5 September 2020; Conference code - 164213
EISBN - 978-9-4639-6800-3

Keywords

Time-domain analysis Computational modeling Finite difference methods Plasmas Attenuation Vegetation Solid modeling

URI

http://hdl.handle.net/10400.8/14077

Citation

S. Faria et al., "Comparative Study of Computational Electromagnetics Applied to Radiowave Propagation in Wildfires," 2020 XXXIIIrd General Assembly and Scientific Symposium of the International Union of Radio Science, Rome, Italy, 2020, pp. 1-4, doi: https://doi.org/10.23919/URSIGASS49373.2020.9232369.