Modeling of Ultra High Frequency Additional Propagation Loss Due to some Troposphere Climatic Variables

Adewumi A. S.; Alade M. O.

In this paper, UHF additional propagation path loss due to some climatic variables at the troposphere were investigated and reported. The paper focuses on modeling UHF propagation path loss due to air temperature, relative humidity and water vapor density of air using empirical approach. The experimentally measured data obtained were analyzed using regression technique and corresponding models were developed. The variations in air temperature with UHF path loss has the best fit with polynomial fitting curve, and the results shown that as air temperature increases, the UHF signal propagation path loss reduces with different gradient coefficients in the first, second, third and fourth orders in the frequency ranges of (935-940)MHz , (945-950) MHz and (950-955) MHz considered. The result also shown significant increase in UHF path loss as relative humidity increases with gradient coefficients of 99.34dB/ %, 109.21424dB/ % and 69.88878dB/ % respectively. Estimation of variation in UHF path loss with volume of water vapor per unit mass of air shown that as water vapor in air increases there is a corresponding increase in UHF path loss with gradient coefficients of 140.896dB/ kgm-3, 145.341dB/ kgm-3 and 136.945dB/ kgm-3 due to refraction, diffraction and scattering of UHF radio wave by water vapor in the air. The results have shown that increase in relative humidity and water vapor of air have additional effects on UHF path loss within the troposphere while increase in air temperature reduces the additional path loss

Select Volume / Issues:

• Volume 9,Issue 5, Sept. 2018

Year:

2018

Type of Publication:

Article

Keywords:

Air Temperature; Relative Humidity; Water Vapor; Additional Path loss; Ultra High Frequency

Journal:

IJECCE

Volume:

9

Number:

5

Pages:

148-151

Month:

September

ISSN:

2249-071X