Results 71 to 80 of about 847,572 (191)

Modeling the GNSS Rural Radio Channel: Wave Propagation Effects caused by Trees and Alleys [PDF]

, 2009
Among the various physical influencing factors with the potential to degrade the overall performance of a global navigation satellite system (GNSS), the behavior of the radio wave propagation channel occupies doubtlessly a central role.
Lehner, A., Schubert, F.M., Robertson, P., Fleury, B.H., Steingass, Alexander   +4 more
core  

Evaluation of Ionospheric Scintillation in GNSS Radio Occultation Measurements and Simulations

, 2020
Like any other system relying on trans-ionospheric propagation, GNSS Radio Occultation (GNSS-RO) is affected by ionospheric conditions during measurements.
Carlström, Anders,, Rasch, Joel, Sievert, Thomas, Ludwig Barbosa, Vinícius,, Sievert, Thomas,, Mats I. Pettersson, Viet T. Vu, Pettersson, Mats, Rasch, Joel,, Thomas Sievert, Ludwig Barbosa, Vinícius, Vinícius Ludwig‐Barbosa, Anders Carlström, Vu, Viet Thuy,, Pettersson, Mats,, Carlström, Anders, Vu, Viet Thuy, Joel Rasch   +17 more
core   +1 more source

Tomographic Imaging of Ionospheric Plasma Bubbles Based on GNSS and Radio Occultation Measurements [PDF]

Remote Sensing, 2018
Total electron content measurements given by the global navigation satellite system (GNSS) have successfully presented results to capture the signatures of equatorial plasma bubbles. In contrast, the correct reproduction of plasma depletions at electron density level is still a relevant challenge for ionospheric tomographic imaging.
Fabricio dos Santos Prol, Manuel Hernández-Pajares, Marcio Tadeu de Assis Honorato Muella, Paulo de Oliveira Camargo   +3 more
openaire   +5 more sources

The Impacts of Tropospheric Gravity Wave‐Generated MSTIDs on Skywaves at Mid‐latitude North American Sector Observed and Modeled Using SuperDARN HF Radars

Radio Science, Volume 61, Issue 9, September 2026.
Abstract Trans‐ionospheric high frequency (HF: 3–30 MHz) response to atmospheric gravity waves (GWs) is studied in the middle‐latitude ionosphere in relation to thunderstorm activity. SuperDARN HF radar observations are compared against the model simulations to quantify the impact of GW‐generated medium‐scale traveling ionospheric disturbances (MSTID ...
S. Chakraborty, P. A. Inchin, S. Debchoudhury, B. Bergsson, M. Zettergren, J. M. Ruohoniemi   +5 more
wiley   +1 more source

Correlation of High‐Latitude Scintillation With Auroral Precipitation: Case Studies Using GNSS Radio Occultation Data From PlanetiQ

Space Weather, Volume 24, Issue 9, September 2026.
Abstract This study presents a survey of high‐latitude ionospheric scintillation using GNSS radio occultation (RO) data from the PlanetiQ satellite. The analysis examines 483 high‐latitude RO tracks between January and May 2023, with 371 tracks exhibiting scintillation events.
Margaret W. Chen, Endawoke Yizengaw, James H. Hecht, Paul Straus, Charles S. Carrano, Tibor Durgonics, Keith M. Groves   +6 more
wiley   +1 more source

On the Origin of Summer Sporadic E Periodicities at Midlatitudes

Space Weather, Volume 24, Issue 9, September 2026.
Abstract Summertime midlatitude sporadic E (Es) layers exhibit daily periodicities whose underlying physical causes remain to be fully identified. We investigate the origin of these periodicities by analyzing an 11‐year data set (2007–2017) comprising ionosonde measurements, FORMOSAT‐3/COSMIC radio occultation (RO) observations, and WACCM‐X neutral ...
Xu Yan, Hongtao Cai, Yusong Qin, Chao Xiong, Jiawei Zhou, Hongwen Xu, Lubing Yang   +6 more
wiley   +1 more source

The FengYun-3C radio occultation sounder GNOS: a review of the mission and its early results and science applications [PDF]

Atmospheric Measurement Techniques, 2018
The Global Navigation Satellite System (GNSS) Occultation Sounder (GNOS) is one of the new-generation payloads on board the Chinese FengYun 3 (FY-3) series of operational meteorological satellites for sounding the Earth's neutral atmosphere and ...
Y. Sun, Y. Sun, Y. Sun, W. Bai, W. Bai, W. Bai, C. Liu, C. Liu, Y. Liu, Q. Du, Q. Du, Q. Du, X. Wang, X. Wang, G. Yang, M. Liao, Z. Yang, X. Zhang, X. Meng, X. Meng, D. Zhao, D. Zhao, J. Xia, J. Xia, Y. Cai, Y. Cai, G. Kirchengast, G. Kirchengast, G. Kirchengast   +28 more
doaj   +1 more source

Atmospheric polarimetric effects on GNSS radio occultations: the ROHP-PAZ field campaign [PDF]

Atmospheric Chemistry and Physics, 2015
Abstract. This study describes the first experimental observations showing that hydrometeors induce polarimetric signatures in global navigation satellite system (GNSS) signals. This evidence is relevant to the PAZ low Earth orbiter, which will test the concept and applications of polarimetric GNSS radio occultation (RO) (i.e.
R. Padullés, E. Cardellach, M. de la Torre Juárez, S. Tomás, F. J. Turk, S. Oliveras, C. O. Ao, A. Rius   +7 more
openaire   +4 more sources

Validation of Global Ionospheric Specification (GIS) Electron Density Measurements During Solar Minimum to Solar Maximum Under Quiet and Disturbed Geomagnetic Conditions

Space Weather, Volume 24, Issue 9, September 2026.
Abstract Global Ionospheric Specification (GIS) three‐dimensional electron density profiles constructed by assimilating the line‐of‐sight total electron content (TEC) from global navigation satellite system (GNSS) radio occultation (RO) measurements by FORMOSAT‐7/COSMIC‐2 (F7/C2) and ground‐based receiver network from international GNSS service ...
P. K. Rajesh, C. H. Charles Lin, C. Y. Lin, T. Matsuo, H. Jin, S. Perwitasari, M. Nishioka, Chao‐Yen Chen   +7 more
wiley   +1 more source

Forecast Impact of FORMOSAT‐7/COSMIC‐2 GNSS Radio Occultation Measurements

Atmospheric Science Letters, 2021
The FORMOSAT‐7/COSMIC‐2 GNSS‐RO mission was launched on June 25, 2019, and it has provided a large increase in the number of GNSS‐RO observations available for operational numerical weather prediction (NWP) in the latitude band between ±40°. A key aim of
Benjamin Ruston, Sean Healy
doaj   +1 more source