Results 101 to 110 of about 3,306 (203)
Ionospheric Delays Compensation for On-The-Fly Integer Ambiguity Resolution in Long Baseline LEO Formations [PDF]
, 2014 This paper deals with the real-time onboard accurate relative positioning by Carrier-phase Differential GPS (CDGPS) of LEO formations with baselines of hundreds of kilometers.
Tancredi, Urbano
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Investigation on Reference Frames and Time Systems in Multi-GNSS
Remote Sensing, 2018 Receivers able to track satellites belonging to different GNSSs (Global Navigation Satellite Systems) are available on the market. To compute coordinates and velocities it is necessary to identify all the elements that contribute to interoperability of ...
Luca Nicolini, Alessandro Caporali
doaj +1 more source
Accuracy Study of a Single Frequency Receiver Using a Combined GPS/GALILEO Constellation [PDF]
, 2005 As the date of availability of GALILEO approaches, more and more interest appears to pre-evaluate the accuracy of GALILEO and combined GPS+ GALILEO receivers. The majority of simulations made are based on the general use of UERE (often presented as a
Belabbas, Boubeker +2 more
core
Investigation on the Impact of Tropospheric Delay on GPS Height Variation near the Equator
, 2009 One of the major problems currently facing satellite-based positioning is the atmospheric refraction of the GPS signal caused by the troposphere. The tropospheric effect is much more pronounced at the equatorial region due to its hot and wet conditions ...
Dodo, Joseph D +2 more
core +1 more source
Satellite Emission Range Inferred Earth Survey (SERIES) project [PDF]
The Global Positioning System (GPS) was developed by the Department of Defense primarily for navigation use by the United States Armed Forces. The system will consist of a constellation of 18 operational Navigation Satellite Timing and Ranging (NAVSTAR ...
Buennagel, L. A. +4 more
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SoftwareXLEO (Low Earth Orbit)-based PNT (Positioning, Navigation and Timing) has become a research topic of much interest and a focus of development. As LEO satellites for PNT are expected to independently provide space-time references in the future, similar to ...
Zhao Xi, Yu Baoguo, Luo Bin
doaj
VEGA Pathfinder navigation for Giotto Halley encounter [PDF]
Results of the VEGA Pathfinder concept which was used to successfully target the European Space Agnecy's Giotto spacecraft to a 600 km encounter with the comet Halley are presented.
Ellis, J., Mcelrath, T. P.
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A Method to Determine BeiDou GEO/IGSO Orbital Maneuver Time Periods
Sensors, 2019 Because there are different types of BeiDou constellations with participating geostationary orbit (GEO) and inclined geosynchronous orbit (IGSO) satellites, the maneuvering frequency of BeiDou satellites is higher than that of other navigation systems ...
Zhiwei Qin +7 more
doaj +1 more source
Time transfer using NAVSTAR GPS [PDF]
, 1982 A time transfer unit (TTU) developed for the U.S. Naval Observatory (USNO) has consistently demonstrated the transfer of time with accuracies much better than 100 nanoseconds. A new time transfer system (TTS), the TTS 502 was developed.
Denz, A. R. +3 more
core +1 more source
Sensors, 2017 The failure to detect anomalies and maneuvering of the orbits of navigation satellite sensors will deteriorate the performance of positioning and orbit determination.
Fei Ye +3 more
doaj +1 more source