Results 121 to 130 of about 13,896,765 (214)

A survey of machine learning techniques for improving Global Navigation Satellite Systems

EURASIP Journal on Advances in Signal Processing
Global Navigation Satellite Systems (GNSS)-based positioning plays a crucial role in various applications, including navigation, transportation, logistics, mapping, and emergency services.
Adyasha Mohanty, Grace Gao
doaj   +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

Safe navigation for vehicles [PDF]

, 2009
La navigation par satellite prend un virage très important ces dernières années, d'une part par l'arrivée imminente du système Européen GALILEO qui viendra compléter le GPS Américain, mais aussi et surtout par le succès grand public qu'il connaît aujourd'
Spangenberg, Mariana
core  

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

GBAS-Technologies for High Precise Safety-Critical Maritime Navigation [PDF]

, 2008
As a result of the high quality of positioning and timing service, satellite navigation becomes the primary means of navigation for most of civil applications, worldwide.
Hirrle, Angelika, Engler, Evelin, Beckheinrich, Jamila, Schlüter, Stefan, Noack, Thoralf, Becker, Carsten, Klähn, Dietmar   +6 more
core  

Interferometric Synthetic Aperture Radar (InSAR) for Monitoring Seasonal Snow

Water Resources Research, Volume 62, Issue 9, September 2026.
Abstract Interferometric Synthetic Aperture Radar (InSAR) offers a potential pathway for measuring seasonal snow water equivalent (SWE) and snow depth at spatial and temporal scales needed for basin‐scale hydrology. First proposed for seasonal snow more than 25 years ago, InSAR uses repeat‐pass radar phase differences to estimate changes in SWE or ...
Jack Tarricone, Ross T. Palomaki, Randall Bonnell, Zachary Hoppinen, Shadi Oveisgharan, Jorge Jorge Ruiz, Hans‐Peter Marshall, Elias J. Deeb, Carrie Vuyovich, Steven A. Margulis, Simon Yueh, Richard R. Forster, Ryan W. Webb, Daniel McGrath, Juha Lemmetyinen, Kelly Elder, Rashmi Shah, Xiaolan Xu   +17 more
wiley   +1 more source

Biases and Uncertainties in Radiosonde‐Based Precipitable Water Vapor

Earth and Space Science, Volume 13, Issue 9, September 2026.
Abstract Precipitable water vapor (PWV) plays an important role in weather and climate phenomena. Accurate PWV measurements based on radiosonde observations are essential for assessing remote‐sensing measurements and long‐term trends. This study examines the performance of PWV algorithms, including their intrinsic biases and their sensitivity to ...
António P. Ferreira, Cesar Azorin‐Molina, Luis Gimeno   +2 more
wiley   +1 more source

Jig-Time and Navigational Support in the Control of Road Transport

International Journal of Advanced Studies, 2015
In this article the question of the direction of use of jig-time and navigation providing the motor transport in the field of steering of transportation process is considered.
Nataliya Grigorievna Kuftinova, Nataliya Evgenievna Surkova   +1 more
doaj  

Mapping Global GNSS Vertical Velocities to Solid Earth Figure Change

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 9, September 2026.
Abstract The Earth's figure evolves in response to glacial isostatic adjustment (GIA), surface‐mass redistribution, and rotational and mantle‐driven processes. While temporal changes in the geoid's flattening are monitored through low‐degree gravity field harmonics, the geometric response of the solid Earth can be assessed independently from GNSS ...
C. Kotsakis
wiley   +1 more source

Ship‐Based GNSS Tsunami Detection: Pilot Network Demonstration

Journal of Geophysical Research: Oceans, Volume 131, Issue 9, September 2026.
Abstract We demonstrate the potential for ship‐based GNSS systems to contribute to tsunami warning. We built a pilot network of 10 ships—8 commercial and 2 research vessels—equipped with a tsunami detection package consisting of a geodetic‐grade GNSS antenna and receiver, and satellite internet communications.
James H. Foster, Todd L. Ericksen, Bruce E. O. Thomas, Jonathan Avery   +3 more
wiley   +1 more source