A simplified approach to the evaluation of EMW propagation characteristics in rain and melting snow

Kharadly, M.M.Z.; Choi, Alex

doi:10.1109/8.1106

Cited by 21 publications

(18 citation statements)

References 15 publications

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“…The characteristic frequency f r and value of m are given by [20]. Because the diameters of the rain drops are comparable to the wavelength, high frequency approximation method should be used at millimeter wavelengths.…”

Section: The Effective Permittivity Of Rain Mediummentioning

confidence: 99%

Study of Parabolic Equation Method for Millimeter-Wave Attenuation in Complex Meteorological Environments

Sheng¹,

Zhong²,

Zhang³

et al. 2016

PIER M

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Abstract-The parabolic equation (PE) method for estimating propagation characteristics of millimeter wave, which takes into account of attenuation caused by complex meteorological environment, is proposed. The meteorological environment is treated as a mixture composed of hydrometeors and atmospheric gases. Effective permittivity of the mixture is considered in this paper. Based on the effective permittivity, the PE model for estimating propagation attenuation of millimeter wave is developed via modifying the refractive index. Finally, the model is employed to simulate the propagation characteristics of millimeter wave in complex geographical environments of irregular terrain and rough sea surface, and in complex meteorological environments of standard atmosphere, rain and fog.

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Section: The Effective Permittivity Of Rain Mediummentioning

confidence: 99%

Study of Parabolic Equation Method for Millimeter-Wave Attenuation in Complex Meteorological Environments

Sheng¹,

Zhong²,

Zhang³

et al. 2016

PIER M

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“…By using the formula [2] (3-4), a = 1/( gPi ) 1/3 a = 1/( Pyi (3 -4) in which pi and a, are related to the rain rate R (mm/h) and are taken from Medhurst's paper [10], we can obtain for the Laws and Parsons distribution a ; 0.0446R0s144 (3 -5) where a is in cm.…”

Section: Average Radius For Four Drop Size Distributionsmentioning

confidence: 99%

“…By letting [8] Lf = 335 J/g, La = 2500 J/g, K = 0.024 J/m.s.K, DVa = 0.225 x 10-4m2/s, taking an approximation from the paper [9] f % 0.685 + 89.5a2 (2 -5) where a2 is in cm, using the standard atmosphere values in the formulae (2)(3)(4)(5)(6) T -To = 6.5 x 10-3h …”

Section: Mass Fractionmentioning

confidence: 99%

“…By using the Kharadly and Choi [2] approach, the specific attenuation a (dB/km) of melting snow can be expressed as c =9.1 g' N f 104 where f is the frequency in GHz and N is the number of snow particles per unit volume in cm-'. N is a function of rain rate R, falling velocity v of a melting particle, and the average radius a. g" (cm3) is a function of frequency, melting particle models, melting degree S, density Pn,m average radius a, dielectric constant of water [5], ice and air.…”

Section: Specific Attenuations and Zenith Excess Attenuationmentioning

confidence: 99%

“…Attenuation of the melting layer below 40 GHz have been investigated by several researchers, listed in the references of the Klaassen's paper [1]. For the frequencies above 40 GHz, the average specific attenuation of the melting layer at the rain rate of 5.08 and 12.7 mm/h have been given [2] for the Laws and Parsons dropsize distribution in the frequency range of 1-1000 GHz. In this paper, the research of melting layer has been extended by giving melting layer models and doing numerical calculations with four drop-size distributions in the frequency range of 1-1000 GHz.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Attenuations for Melting Snow and the Melting Layer

Zhang¹,

Salonen²,

Karhu³

1990

20th European Microwave Conference, 1990

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Melting layer has been described with two melting particle models. The specific attenuation of melting snow, the average specific attenuation and the excess attenuation of the melting layer have been calculated by using two melting particle models and an approximate method in a frequency range of 1-1000 GHz for the precipitation rate below 12.5 mm/h. Numerical calculations have been performed with four drop-size distributions. The parameters a and b of the power law relation aRb for the average specific attenuation of the melting layer have been given in the frequency range.

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