Results 91 to 100 of about 9,363 (210)

An Ambient Adaptive Global Navigation Satellite System Total Electron Content Predictive Model for Short-Term Rapid Geomagnetic Storm Events

Remote Sensing
Satellite navigation is an essential component of the national infrastructure. Space weather and ionospheric conditions are the prime sources of GNSS (global navigation satellite system) positioning, navigation, and timing (PNT) service disruptions and ...
Renato Filjar, Ivan Heđi, Jasna Prpić-Oršić, Teodor Iliev   +3 more
doaj   +1 more source

A Contrasting TEC Behavior Over the Low‐Latitude Post‐Midnight Sector During Recovery Phases of May and October 2024 Storms: Possible Role of PPEF, DDEF, and O/N2

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract The present study reports on the variability of the post‐midnight ionosphere over the low‐latitude sector during the recovery phases of the May and October 2024 storms. Multi‐instrument observations, comprising global navigation satellite system total electron content (TEC), F‐layer peak height, electron density profiles, and column O/N2 ...
Rahul Rathi, Akash Kumar, Alok Kumar Ranjan, Dipjyoti Patgiri, Satarupa Chakrabarti, Lot Ram   +5 more
wiley   +1 more source

Longitudinal Variation of Ionospheric Irregularities and Response of the Ionosphere During 10–13 May and 10–13 October 2024 Geomagnetic Storms

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract We examine the response of the ionosphere to the 10–13 May 2024 and 10–13 October 2024 geomagnetic storms, the two recent great geomagnetic storms of solar cycle 25. We identified the occurrence of ionospheric irregularities during the two geomagnetic storms.
Valence Habyarimana, Mark B. Moldwin, John Bosco Habarulema, Sharon Aol, Jean Claude Uwamahoro, Teshome Dugassa, Daniel Okoh, Solomon Otoo Lomotey   +7 more
wiley   +1 more source

The study of the efficiency of navigation system integration algorithms based on the extended Wiener filter

Научный вестник МГТУ ГА
Integration of the resulting output signals of the global navigation satellite system (GNSS) and the inertial navigation system (INS) is designed to ensure reliable, safe and stable performance of the aircraft navigation system.
A. S. Zasukhin, V. D. Budaev, D. O. Sizikov   +2 more
doaj   +1 more source

Investigating the Leptokurtotic Nature of Low‐Latitude GNSS Scintillations With a Multiscale Approach

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract We investigate the statistical nature of Global Navigation Satellite System (GNSS) signal fluctuations through the multiscale analysis of a strong scintillation event recorded at the Ionospheric Observatory of the Luigi Broglio Space Center in Malindi, Kenya.
L. Spogli, K. Meziane, P. T. Jayachandran, E. Pica, A. Cicone, L. Alfonsi   +5 more
wiley   +1 more source

Demand and key technology for a LEO constellation as augmentation of satellite navigation systems

Satellite Navigation
A Low Earth Orbit (LEO) constellation augmenting satellite navigation is important in the future development of Global Navigation Satellite System (GNSS).
Yuanxi Yang, Yue Mao, Xia Ren, Xiaolin Jia, Bijiao Sun   +4 more
doaj   +1 more source

Assessing GNSS Reflectometry for High‐Latitude 3D Ionospheric Imaging

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract This study investigates whether Global Navigation Satellite System Reflectometry (GNSS‐R) measurements from low‐Earth‐orbit (LEO) satellites can improve three‐dimensional (3D) ionospheric electron density imaging, with a focus on high‐latitude regions. Conventional ionospheric tomography is limited by sparse ground‐based receiver coverage over
Brenna Royersmith, Brian Breitsch, Jade Y. Morton   +2 more
wiley   +1 more source

CELESTIAL NAVIGATION AS THE EMERGENCY GNSS BACKUP: ENHANCING NAVIGATIONAL RELIABILITY

Scientific Journal of Gdynia Maritime University
The development of Global Navigational Satellite Systems (GNSS) has revolutionised navigation on ships. GNSS, together with electronic chart display information system (ECDIS), has made navigation more accurate, efficient, and safer for sailors. However
Ihor Liubarets
doaj   +1 more source

Quantitative Assessment of Geographic Control of December Solstice EIA Crest Shifts Over Southeast Asia Under Low Solar Activity

Space Weather, Volume 24, Issue 8, August 2026.
Abstract This study quantitatively assesses the drivers of the Equatorial Ionization Anomaly (EIA) morphology and latitudinal shifts over Southeast Asia during the December solstice. We use a 27‐year ionospheric data set (1998–2024) of total electron content (TEC) and F2‐layer peak electron density (NmF2) under geomagnetically quiet conditions.
Linfeng Huang, Jinsong Wang, Tian Mao, Shanhai Song, Yungang Wang   +4 more
wiley   +1 more source

An Ionospheric Storm Scale Index Based on TEC: Comparative Analysis for China Region

Space Weather, Volume 24, Issue 8, August 2026.
Abstract Defining a standardized ionospheric storm scale is challenging given the ionosphere's inherent complexity and susceptibility to multiple driving factors. In this study, a novel ionospheric storm scale (ISS) index is developed based on statistical analysis of total electron content (TEC) data from 257 ground‐based GNSS stations across China ...
Shuangshuang Shi, Yunfei Shi, Kefei Zhang, Bingfeng Tan, Fucheng Song, Peng Sun, Yu Li, Yifan Liu, Shouxing Zhao   +8 more
wiley   +1 more source