Results 71 to 80 of about 17,319 (249)

Galileo: the added value for integrity in harsh environments [PDF]

, 2015
A global navigation satellite system (GNSS)-based navigation is a challenging task in a signal-degraded environments where GNSS signals are distorted by multipath and attenuated by fading effects: the navigation solution may be inaccurate or unavailable.
BORIO DANIELE, GIOIA Ciro
core   +1 more source

Probing Jupiter's Atmosphere Through Juno Radio Occultations: Methodology and Initial Observations

Geophysical Research Letters, Volume 52, Issue 22, 28 November 2025.
Abstract This paper presents an analysis of Juno's first radio occultation experiments. Relying on two‐way radio links in the X‐ and Ka‐bands, we processed data from NASA's Deep Space Network antennas through a ray‐tracing inversion algorithm.
Andrea Caruso, Luis Gomez Casajus, Maria Smirnova, Dustin Buccino, Eli Galanti, William B. Hubbard, Andrea Togni, Edoardo Gramigna, Marzia Parisi, Ryan S. Park, Marco Zannoni, Paul G. Steffes, Steven M. Levin, Scott J. Bolton, Paolo Tortora, Yohai Kaspi   +15 more
wiley   +1 more source

Sub‐Seasonal Impact of GNSS Radio Occultation Data

Geophysical Research Letters, Volume 52, Issue 21, 16 November 2025.
Abstract This study investigates for the first time whether the assimilation of the Global Navigation Satellite System Radio occultation (GNSS‐RO) data has a significant impact on the European Centre for Medium‐Range Weather Forecasts sub‐seasonal forecasts.
K. Lonitz, F. Vitart, S. B. Healy, Qiang Fu   +3 more
wiley   +1 more source

L’ITSS “Majorana-Giorgi” di Genova in orbita con i sistemi di navigazione via satellite

GEOmedia, 2015
The article describes an educational experiment: to spread technical know-how on satellite navigation (GPS, GLONASS and Galileo) already at secondary school education level.
Primo Bartoli, Marco Lisi
doaj   +2 more sources

Space in 150 years: From fantasy through fiction to fact and function [PDF]

, 2015
In the last century and a half, space has moved from the realm of fantasy to everyday reality. In parallel, the way space has been regarded by the person in the street and the ideas of what access to space might be used for have evolved extraordinarily.
Southwood, DJ
core   +1 more source

JWST Imaging of the Closest Globular Clusters—VI. The Lowest‐Mass Objects in M 4 and the Galactic Bulge

Astronomische Nachrichten, Volume 346, Issue 9, November 2025.
ABSTRACT We present James Webb Space Telescope observations of M 4—the closest globular cluster—that probe the lower Main Sequence down to the hydrogen‐burning limit. The unveiled stellar sequence reaches much fainter luminosities than previously possible, revealing a few extremely red objects that are consistent with brown dwarfs as cool as Teff∼1000K$
L. R. Bedin, R. Gerasimov, A. Calamida, M. Libralato, M. Scalco, D. Nardiello, M. Griggio, D. Apai, J. Anderson, A. Bellini, A. Burgasser   +10 more
wiley   +1 more source

Consistency of MGEX Orbit and Clock Products

Engineering, 2020
The analysis centers of the Multi-GNSS Pilot Project of the International GNSS Service provide orbit and clock products for the global navigation satellite systems (GNSSs) Global Positioning System (GPS), GLONASS, Galileo, and BeiDou, as well as for the ...
Peter Steigenberger, Oliver Montenbruck
doaj   +1 more source

First Detection of [SI] in Near‐IR JWST Observations of Io in Eclipse, and Comparison With SO Emissions, Evolving Volcanic Eruptions, and Prior UV HST‐STIS [SI] Emissions

Journal of Geophysical Research: Planets, Volume 130, Issue 11, November 2025.
Abstract We observed Io with the James Webb Space Telescope (JWST) NIRSpec/Integral Field Unit (1.0–5.3 μm, R∼2700 $R\sim 2700$) in August 2023 while the satellite was in eclipse. Thermal emission from Kanehekili Fluctus is consistent with the cooling of lava flows after a vigorous eruption in November 2022.
Imke de Pater, Darrell F. Strobel, Ashley Gerard Davies, Joachim Saur, Lorenz Roth, Katherine de Kleer, Emmanuel Lellouch, Zachariah Milby, Carl Schmidt, Thierry Fouchet, Michael H. Wong, Leigh N. Fletcher, Jake Harkett, Michael Roman, Richard J. Cartwright, Jason E. Perry, Julie Renaud‐Kim, Carolyn Jordan, Stephan Schlegel, David A. Williams, David M. Nelson   +20 more
wiley   +1 more source

Insights Into Seismic‐Induced Ionospheric Perturbation Following the 2025 Myanmar Earthquake

Journal of Geophysical Research: Space Physics, Volume 130, Issue 11, November 2025.
Abstract A major earthquake with a magnitude of MW = 7.7, followed by several aftershocks, occurred in Mandalay, Myanmar, on 28 March 2025. This study aims to report on the co‐seismic ionospheric disturbances caused by the event, based on a multi‐instrument approach that was adopted to examine co‐seismic effects.
Trisani Biswas, Mefe Moses, Haris Haralambous, Md. Golam Mostafa   +3 more
wiley   +1 more source

THE DEVELOPMENT OF NAVIGATION SYSTEMS IN CIVIL AVIATION

Научный вестник МГТУ ГА, 2017
The article describes the history of navigation systems formation, such as "Cicada" system, which at that time could compete with the US "Transit", European, Chinese Beidou navigation system and the Japanese Quasi-Zenit.The detailed information about ...
A. S. Stepanenko
doaj