Results 11 to 20 of about 789,573 (302)

Ten years analysis of Tropospheric refractivity variations [PDF]

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   +4 more sources

High Temporal Resolution Refractivity Retrieval from Radar Phase Measurements [PDF]

Remote Sensing, 2018
Knowledge of the spatial and temporal variability of near-surface water vapor is of great importance to successfully model reliable radio communications systems and forecast atmospheric phenomena such as convective initiation and boundary layer processes.
Rubén Nocelo López, Verónica Santalla del Río   +1 more
doaj   +2 more sources

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   +2 more sources

Statistics of Radio Refractivity Derived from Prague Radiosounding Data

Radioengineering, 2003
Vertical gradient of radio refractivity in the lowest 100 m isderived from the meteorological radio-sounding data of the Prague-Libusstation. The data cover the measurements at the terms 00, 06, 12, and18UTC, and the extent of data is 20 years.
L. Ramon Saez, O. Fiser, D. Rezacova
doaj   +1 more source

Investigation of the Effects of Weather Variability on Surface Radio Refractivity and Digital Terrestrial Television Signal Strength in the UHF Band

Journal of High-Frequency Communication Technologies
This study examines the impact of atmospheric variables on the propagation of digital terrestrial television signals from Ogun State Television, located in Abeokuta, Ogun State, Nigeria, with a focus on the relationship between weather parameters and ...
Abolaji Okikiade Ilori, Kamoli Akinwale Amusa, Tolulope Christiana Erinosho, Olumayowa Idowu   +3 more
doaj   +2 more sources

Retrieving tropospheric refractivity structure using interferometry of aircraft radio transmissions [PDF]

Atmospheric Measurement Techniques
Detailed measurements of atmospheric humidity in the lower atmosphere are currently difficult and expensive to obtain. For this reason, there is interest in the development of low-cost, high-volume opportunistic technologies to acquire measurements of ...
O. Lewis, O. Lewis, C. Brunt, M. Kitchen, N. E. Bowler, E. K. Stone   +5 more
doaj   +3 more sources

Seasonal and latitudinal variations of surface radio refractivity over Nigeria [PDF]

, 2022
Refractivity is a significant challenge of radio signal propagation. As it often distorts or leads to loss of signals. The seasonal and latitudinal variations of surface refractivity at three Nigerian tropospheric Observatory stations in Nigeria, namely ...
Eunice, Sanyaolu Modupe, Olufemi, Sanyaolu, Enice Sanyaolu, Modupe   +2 more
core   +1 more source

Determination of radio wave propagation conditions in the atmosphere of Hanoi using the radiosonde data of balloons

ICT Express, 2022
This article uses radiosonde data of balloons in Hanoi to determine the radio refractive index and the conditions of radio wave propagation in the atmosphere.
Chi Cong Pham, Xuan Anh Nguyen
doaj   +1 more source

Prediction of Wide Range Two-Dimensional Refractivity Using an IDW Interpolation Method from High-Altitude Refractivity Data of Multiple Meteorological Observatories

Applied Sciences, 2021
This article proposes a method for the prediction of wide range two-dimensional refractivity for synthetic aperture radar (SAR) applications, using an inverse distance weighted (IDW) interpolation of high-altitude radio refractivity data from multiple ...
Sungsik Wang, Tae Heung Lim, Kyoungsoo Oh, Chulhun Seo, Hosung Choo   +4 more
doaj   +1 more source

Diurnal changes of radio refraction [PDF]

Symposium - International Astronomical Union, 1979
Pathlength variations due to refraction changes in the troposphere may impose a severe limitation to VLB experiments (like random clock drifts). In connection with a VLB experiment Moran and Penfield (1976) analysed surface values of water vapor density, data of several hundred radiosonde launches and of measurements of sky brightness near the water ...
openaire   +1 more source