Results 21 to 30 of about 1,255 (307)

Long-Term Characterization of Vertical Radio Refractivity Gradients and Tropospheric Propagation Conditions over North-Central Nigeria Using ERA5 Reanalysis Data [PDF]

Physics Access
This study presents a comprehensive long-term evaluation of vertical radio refractivity and refractivity gradients over selected locations in North-Central Nigeria.
Usman S Lami, Ikechiamaka N Florenc, Akinbolati Akinsanmi, Isaac H Daniel, Owolabi J Adeyemi, Abubakar Dalhat, Stephen C Nnochin, Akusu O Christiana, Mansur Bala, Bolorunduro C Blessing, Mohammed Mohammed, Adamu Idris   +11 more
doaj   +1 more source

Investigation of Point Refractivity Gradient and Geoclimatic Factor at 70 m Altitude in Yenagoa, Nigeria

Journal of Nigerian Society of Physical Sciences, 2023
The quality of services provided via Inter-Terrestrial radio communication links such as GSM networks, Wide Area Network (WAN), Radio and TV broadcasts is largely influenced by some meteorological parameters such as temperature, pressure and humidity ...
Y. B. Lawal, E. T. Omotoso
doaj   +1 more source

Ten years analysis of Tropospheric refractivity variations

Annals of Geophysics, 2004
The refractivity variations of the troposphere are responsible for various effects on radio wave propagation, such as refraction, bending, radio-station interference, etc.
T. D. Xenos, S. A. Isaakidis
doaj   +1 more source

Estimation of some Radio Propagation Parameters using Measurements of Surface Meteorological Variables in Ede, Southwest Nigeria

Journal of Nigerian Society of Physical Sciences, 2022
A data acquisition system that utilised the open-source Arduino platform was developed to take real-time ground measurements of primary radio climatological variables of pressure, temperature, and relative humidity at Ede, a tropical station in southwest
A. A. Willoughby, M. E. Sanyaolu, M. O. Osinowo, A. O. Soge, O. F. Dairo   +4 more
doaj   +1 more source

Estimation and evaluation of COSMIC radio occultation excess phase using undifferenced measurements [PDF]

Atmospheric Measurement Techniques, 2017
In the GPS radio occultation technique, the atmospheric excess phase (AEP) can be used to derive the refractivity, which is an important quantity in numerical weather prediction.
P. Xia, S. Ye, K. Jiang, D. Chen
doaj   +1 more source

Simulations of ionospheric refraction on radio interferometric data [PDF]

Publications of the Astronomical Society of Australia, 2021
AbstractThe Epoch of Reionisation (EoR) is the period within which the neutral universe transitioned to an ionised one. This period remains unobserved using low-frequency radio interferometers, which target the 21 cm signal of neutral hydrogen emitted in this era.
J. Kariuki Chege, C. H. Jordan, C. Lynch, J. L. B. Line, C. M. Trott   +4 more
openaire   +3 more sources

Improving the bias characteristics of the ROPP refractivity and bending angle operators [PDF]

Atmospheric Measurement Techniques, 2014
The bending angle observation operator (forward model) currently used to assimilate radio occultation (RO) data at the Met Office, the European Centre for Medium-Range Weather Forecasts (ECMWF) and other centres is the same as is included in the Radio ...
C. P. Burrows, S. B. Healy, I. D. Culverwell   +2 more
doaj   +1 more source

Influence of weather variables on atmospheric refractivity over Auchi Town, Edo State, Nigeria

Journal of Applied Sciences and Environmental Management, 2018
In this study, atmospheric variables such as air temperature, relative humidity and atmospheric pressure were evaluated in order to determine the atmospheric refractivity over Auchi town in Edo State, Nigeria using a portable weather monitoring system ...
K.E. Ukhurebor, S.O. Azi, I.C. Abiodun, S.E. Ojiemudia   +3 more
doaj   +1 more source

Radio Refractivity Impact on Signal Strength of Mobile Communication

Journal of Electrical and Computer Engineering, 2023
This research investigated radio refractivity impact on signal strength of mobile communication. The mobile communication signal strengths of two popular networks in Nigeria, 9Mobile and MTN, were considered.
Joseph Amajama, Emmanuel N. Asagha, Ogri J. Ushie, Prince C. Iwuji, Julius U. Akwagiobe, Fina O. Faithpraise, Alexander I. Ikeuba, Donatus E. Bassey   +7 more
doaj   +1 more source

Refractive radio scintillation in the solar wind [PDF]

Monthly Notices of the Royal Astronomical Society, 1989
La radiosource extragalactique 3C279 a ete observee par VLA lorsque la source se trouvait a une elongation solaire de 0.9 o . Les resultats des observations montrent des variations lentes dans le flux, qui sont interpretees comme une scintillation de refraction causee par des heterogeneites de densite a grande echelle dans le vent ...
R. Narayan, K. R. Anantharamaiah, T. J. Cornwell   +2 more
openaire   +1 more source