Results 81 to 90 of about 17,319 (249)

New satellite systems for obtaining data for Geographic information systems [PDF]

Acta Montanistica Slovaca, 2006
Galileo will be the European global navigation satellite system, providing a highly accurate and a guaranteed global positioning service under the civilian control.
Miroslav Šimčák
doaj  

Testing the Positioning Accuracy of GNSS Solutions during the Tramway Track Mobile Satellite Measurements in Diverse Urban Signal Reception Conditions

Energies, 2020
Mobile Global Navigation Satellite System (GNSS) measurements carried out on the railway consist of using satellite navigation systems to determine the track geometry of a moving railway vehicle on a given route.
Mariusz Specht, Cezary Specht, Andrzej Wilk, Władysław Koc, Leszek Smolarek, Krzysztof Czaplewski, Krzysztof Karwowski, Paweł S. Dąbrowski, Jacek Skibicki, Piotr Chrostowski, Jacek Szmagliński, Sławomir Grulkowski, Sławomir Judek   +12 more
doaj   +1 more source

Solar Wind and Geomagnetic Conditions That Lead to the Largest Relativistic Electron Fluxes in GPS Orbit

Space Weather, Volume 23, Issue 11, November 2025.
Abstract Relativistic electrons are an important space weather hazard, being a major source of radiation damage to satellites and posing a risk to humans in space. We use approximately 20 years of data from the US Global Positioning System (GPS) satellite NS41 to determine the characteristics of the geomagnetic storms that lead to the largest ...
Nigel P. Meredith, Jacob Bortnik, Man Hua, Thomas E. Cayton, Mark A. Clilverd, Tom A. Daggitt, Kaine A. Bunting   +6 more
wiley   +1 more source

Impacts of Space Weather‐Induced Satellite Navigation Errors on UAV Collision Risk: An Estimation for Parallel and Crossing Routes

Space Weather, Volume 23, Issue 11, November 2025.
Abstract Satellite navigation systems are vulnerable to space weather disturbances, which can degrade positioning accuracy and potentially increase the collision risk of unmanned aerial vehicles (UAVs). This study investigates the influence of navigation errors caused by ionospheric scintillation on UAV encounter scenarios. Two route configurations are
Dabin Xue, Chengpeng Jiang, Shiwei Yu, Zhe Yang, Jialing Liu   +4 more
wiley   +1 more source

Galileo: orologi atomici e ridondanze

GEOmedia, 2017
Galileo atomic clocks and redundancies. Some malfunction on board of Galileo satellites are likely to affect the results of the satellite positioning system.
Gianluca Pititto
doaj   +2 more sources

M‐SADR: Mobile Self Adaptive Data Rate for Enhanced LoRa End‐Device Connectivity on the Move

International Journal of Communication Systems, Volume 38, Issue 15, October 2025.
The proposed M‐SADR method targets mobile LoRa end‐devices and achieves better performance, with a 2.4% improvement in packet delivery ratio and a 5.7% reduction in power consumption per successfully delivered packet. ABSTRACT Mobility is a critical aspect of the Internet of Things, reflecting the diverse and dynamic nature of potential applications ...
Vasileios Moysiadis, Panagiotis Radoglou‐Grammatikis, Evangelos Mourikis, Maria Zevgara, Dimitrios N. Skoutas, Charalabos Skianis, Panagiotis Sarigiannidis   +6 more
wiley   +1 more source

Multi-GNSS Combined Precise Point Positioning Using Additional Observations with Opposite Weight for Real-Time Quality Control

Remote Sensing, 2019
The emergence of multiple global navigation satellite systems (multi-GNSS), including global positioning system (GPS), global navigation satellite system (GLONASS), Beidou navigation satellite system (BDS), and Galileo, brings not only great ...
Wenju Fu, Guanwen Huang, Yuanxi Yang, Qin Zhang, Bobin Cui, Maorong Ge, Harald Schuh   +6 more
doaj   +1 more source

Fast Computerized Ionospheric Tomography Using GNSS‐TEC in Densely Observed Regions

Journal of Geophysical Research: Space Physics, Volume 130, Issue 10, October 2025.
Abstract In recent years, the range of technologies affected by the ionosphere has been steadily expanding. Technologies such as Global Positioning System, which have become indispensable in modern society, can suffer from degraded accuracy due to ionospheric structures.
Satoru Yoneyama, Ken Umeno
wiley   +1 more source

Space-Time Reference with an Optical Link

, 2015
We describe a method for realizing a high-performance Space-Time Reference (STR) using a stable atomic clock in a precisely defined orbit and synchronizing the orbiting clock to high-accuracy atomic clocks on the ground.
Berceau, Paul, Hollberg, Leo, Kahn, Joseph M., Taylor, Michael   +3 more
core   +1 more source

Real-time On-board Satellite Navigation using GPS and Galileo Measurements

, 2014
65th International Astronautical Congress; Toronto, Canada; 2014-09-29 - 2014-10 ...
Sanat Biswas, Qiao, Li, Dempster, Andrew
openaire   +3 more sources