Results 21 to 30 of about 789,573 (302)

Yearly, Seasonal and Daily Variations of Radio Refractivity [PDF]

, 2011
Yearly, seasonal and daily variations of radio refractivity have been analyzed. The method proposed in the recommendation of International Telecommunication Union ITU has been used.
Tamošiūnaitė, M., Žilinskas, M., Tamošiūnienė, M., Tamošiūnas, S.   +3 more
core   +1 more source

Tropospheric Refractivity Profile Estimation by GNSS Measurement at China Big-Triangle Points

Atmosphere, 2021
Atmospheric radio refractivity has an obvious influence on the signal transmission path and communication group delay effect. The uncertainty of water vapor distribution is the main reason for the large error of tropospheric refractive index modeling ...
Xiang Dong, Fang Sun, Qinglin Zhu, Leke Lin, Zhenwei Zhao, Chen Zhou   +5 more
doaj   +1 more source

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

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

Global analysis of atmospheric refractivity profiles from COSMIC GPS radio occultation soundings [PDF]

Geodetski Vestnik, 2020
Atmospheric refractivity is a function of temperature, pressure and water vapor. The refractivity retrieved from the Global Navigation Satellite Systems (GNSS) radio occultation soundings has fine vertical resolution and high accuracy, so it can be used ...
Shaoqi Gong, Cunjie Zhang, Geshi Tang, Yehui Zhang, Jing Han   +4 more
doaj   +1 more source

Assessment of Radio Refractivity and Frequency Modulated Radio Signal Strength Variability with Time in Broadcasting System using Osun State Broadcasting Cooperation (OSBC), FM 104.5 MHz as a Reference Station

, 2022
Radio Refractivity and frequency modulated radio signal strength were simultaneously synchronized through a self-developed frequency modulated radio signal Strength (FMRSS) and radio refractivity (RF) Meter to acquire data for this research work.
Familusi, T. O, Ewetumo, T, Ojo, J. S, Adedayo, K. D   +3 more
core   +1 more source

Statistical Estimation and Mathematical Modelling of Tropospheric Radio Refractivity Based on Meteorological Data [PDF]

, 2018
To obtain optimal performance, estimation of radio refractivity is essential in planning and design of radio links/systems. The dependence of radio refractivity on different climatic parameters such as temperature, pressure, humidity and scale height is ...
Ahmad, N., Awais, M., Alimgeer, K. S., Ijaz, B., Subhan, F., Khan, S. A.   +5 more
core   +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

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

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