Determination of the sub-terahertz attenuation of brownout clouds generated by rotorcraft

Ceolato, Romain; Diakonova, Nina; Meilhan, Jean–Baptiste; Knap, W.

doi:10.1109/irmmw-thz.2017.8066957

Cited by 2 publications

(2 citation statements)

References 4 publications

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“…Along with humidity and salinity SD particles contain huge amounts of charge that can alter saltation and create powerful electric fields [199]. The surface charges on the SD particles [174] are considered among the various reasons to explain why the observed values for attenuation are much higher than the predicted values [203][204]. Many factors contribute to the charge on SD particles, including friction [196], contact [195][177], and frequent particle collisions [192,193].…”

Section: H Influence Of Charges On Sds Attenuation Modelsmentioning

confidence: 99%

Earth and Martian Sand and Dust Storms: A Comprehensive Review of Attenuation Modelling and Measurements

Noreen,

Giannetti,

Lottici

2024

IEEE Access

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Sand and dust storms (SDS) are significant atmospheric phenomena that have a negative impact on wireless links operating at various frequencies. Specifically, sand and dust (SD) particles produce attenuation in propagating electromagnetic (EM) waves upon impact, which must be measured for the proper functioning of the fade mitigation strategy. The attenuation due to SDS can be reliably evaluated using specialized equipment. However, field experiments have been conducted in only a few locations and for a limited number of link geometries; therefore, the results are not immediately generalizable to all locations. Consequently, various attenuation models based on accessible meteorological data have been developed to provide sufficient inputs for system margin calculations under all environmental conditions. In this paper, we present a comprehensive review of an extensive set of Earth SDS attenuation models that differ based on various particle characteristics in terrestrial and space communication. Furthermore, we discuss how variables such as humidity and surface charges carried by the particles are addressed in the literature. We also provide the results of various field studies conducted in many parts of the world under diverse conditions to directly measure the influence of SDS on wireless communication systems. Dust is also a significant meteorological factor in the Martian atmosphere, where it affects the efficiency of the wireless sensor networks used by NASA's Mars Exploration Project. We explore how attenuation has been extrapolated in the Martian atmosphere. Additionally, we discuss future research challenges in SDS.INDEX TERMS Attenuation, Mie Scattering, Rayleigh Model, Sand and dust storm (SDS), Satellite communication.

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Section: H Influence Of Charges On Sds Attenuation Modelsmentioning

confidence: 99%

Earth and Martian Sand and Dust Storms: A Comprehensive Review of Attenuation Modelling and Measurements

Noreen,

Giannetti,

Lottici

2024

IEEE Access

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“…The attenuation is concomitantly due to the molecular absorption by the various air components [18,19] and the scattering by the aerosols. It has been recently shown that the extinction is dominated by scattering under 500 GHz [20]. Consequently, in that frequency range, the wave attenuation, or the visibility, varies dramatically from one arid area to another and from one helicopter type to another.…”

Section: Introductionmentioning

confidence: 99%

Modeling of an active terahertz imaging system in brownout conditions

Prophete¹,

Pierrat²,

Sik³

et al. 2018

Appl. Opt.

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We present a theoretical evaluation of a subterahertz (subTHz) system to image through a scattering medium composed of scatterers of sizes close to the wavelength. We specifically study the case of sand grain clouds created by helicopter rotor airflow during landing in arid areas. The different powers received by one pixel of a matrix made of subTHz sensors are identified. Photometric and antenna-based sensors are considered. Besides the thermal contribution to the noise, we focus our attention on the radiation backscattered by the brownout. It appears that a configuration where the source and the camera are distant is the most promising configuration and is realistic for embedded systems.

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Determination of the sub-terahertz attenuation of brownout clouds generated by rotorcraft

Cited by 2 publications

References 4 publications

Earth and Martian Sand and Dust Storms: A Comprehensive Review of Attenuation Modelling and Measurements

Earth and Martian Sand and Dust Storms: A Comprehensive Review of Attenuation Modelling and Measurements

Modeling of an active terahertz imaging system in brownout conditions

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