Results 21 to 30 of about 243 (163)
Precise Onboard Time Synchronization for LEO Satellites
Navigation, 2022 Onboard time synchronization is an important requirement for a wide range of low Earth orbit (LEO) missions such as altimetry or communication services, and extends to future position, navigation, and timing (PNT) services in LEO.
Florian Kunzi, Oliver Montenbruck
doaj +1 more source
New Index to Characterize Ionospheric Irregularity Distribution
Space Weather, Volume 21, Issue 9, September 2023., 2023 Abstract Characterization of the global ionospheric irregularities as a function of local time, longitude, altitude, and magnetic activities is still a challenge for radio frequency operations, especially at the low‐latitude region. One of the main reasons is lack of observations due to the unevenly distributed instruments. To overcome this constraint,
Endawoke Yizengaw
wiley +1 more source
LEO Enhanced Global Navigation Satellite System (LeGNSS): progress, opportunities, and challenges
Geo-spatial Information Science, 2021 With the completion of Chinese BeiDou Navigation Satellite System (BDS), the world has begun to enjoy the Positioning, Navigation, and Timing (PNT) services of four Global Navigation Satellite Systems (GNSS).
Haibo Ge +8 more
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Exploring the Contribution of PNT LEO Satellites to Precise Positioning Applications
Engineering Proceedings, 2023 Positioning services based on GNSS (Global Navigation Satellite Systems) have been using MEO satellites designed to guarantee Earth global coverage for decades.
Jorge Durán +5 more
doaj +1 more source
Empowering the Tracking Performance of LEO PNT by Means of Meta-Signals
2020 IEEE International Conference on Wireless for Space and Extreme Environments (WiSEE), 2020 Global Navigation Satellite Systems (GNSSs) are by far the most widespread technology for Position Navigation and Timing (PNT). They have been traditionally deployed exploiting Medium Earth Orbit (MEO) or Geostationary Earth Orbit (GEO) satellite constellations. To meet future demands and overcome MEO and GEO limitations, GNSSs based on Low Earth Orbit
Nardin, Andrea +2 more
openaire +2 more sources
Remote Sensing, 2021 Currently, low Earth orbit (LEO) satellites are attracting great attention in the navigation enhancement field because of their stronger navigation signal and faster elevation variation than medium Earth orbit (MEO) satellites.
Junjun Yuan +6 more
doaj +1 more source
Towards Efficient LEO-Constellation Design for Regional PNT Services
Journal of Communications Software and SystemsThe growing availability of low-cost positioning technologies enables broader access to advanced Positioning, Navigation, and Timing (PNT) services for regional and global applications.
Elena Simona Lohan +2 more
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Integrity Monitoring of GNSS Constellations with Only LEO-PNT Satellites
European Navigation Conference 2024Carlos Catalán Catalán +2 more
exaly +2 more sources
Demand and key technology for a LEO constellation as augmentation of satellite navigation systems
Satellite NavigationA Low Earth Orbit (LEO) constellation augmenting satellite navigation is important in the future development of Global Navigation Satellite System (GNSS).
Yuanxi Yang +4 more
doaj +1 more source
Radio Science, Volume 61, Issue 6, June 2026.Abstract The ionosphere imposes coupled amplitude, phase, and polarization distortions on trans‐ionospheric Global Navigation Satellite System (GNSS) signals, reflecting the structure and dynamics of electron‐density irregularities. Classical weak‐scatter theory provides a mature framework for interpreting amplitude and phase scintillation, but these ...
T. Durgonics, S. S. Beeck
wiley +1 more source