Results 111 to 120 of about 169 (129)
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Accuracy evaluation of Doresa and Milena Galileo satellites broadcast ephemerides
2018 IEEE International Workshop on Metrology for the Sea; Learning to Measure Sea Health Parameters (MetroSea), 2018On 22 August 2014 Doresa and Milena Galileo satellites were launched in wrong orbit. In November 2014 European space agency started a salvaged mission to make two satellites usable. On 5 August 2016 these two satellites started broadcasting ephemerides in navigation message for testing purposes.
G Benassai +2 more
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International Journal of Satellite Communications and Networking, 1994
AbstractFrequency stability analysis of on‐orbit Navstar clocks is performed by the Naval Research Laboratory using both the broadcast and the precise post‐processed ephemerides. The phase offset between the Navstar clock and the reference clock is computed from pseudorange measurements obtained by dual‐frequency GPS receivers at the five GPS monitor ...
Thomas B. McCaskill +3 more
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AbstractFrequency stability analysis of on‐orbit Navstar clocks is performed by the Naval Research Laboratory using both the broadcast and the precise post‐processed ephemerides. The phase offset between the Navstar clock and the reference clock is computed from pseudorange measurements obtained by dual‐frequency GPS receivers at the five GPS monitor ...
Thomas B. McCaskill +3 more
exaly +2 more sources
BDS-3 and GPS/Galileo integrated PPP using broadcast ephemerides
GPS Solutions, 2022Na Wei, Qile Zhao, Zhao Qile
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Broadcast vs. precise GPS ephemerides: a historical perspective
GPS Solutions, 2003John F Raquet
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An improved method for real-time PPP timing and time transfer with broadcast ephemerides
Measurement Science and Technology, 2022Abstract Due to the problem of network communication, it is difficult to ensure the reliability of real-time precise point positioning (PPP) timing/time transfer with real-time precise products. With the continued reduction in the signal-in-space range error, the performance and feasibility of GPS and Galileo PPP ...
Yulong Ge +5 more
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GPS positioning with broadcast and precise ephemerides
SICE '95. Proceedings of the 34th SICE Annual Conference. International Session Papers, 2002The precise ephemeris and space vehicle clock corrections computed routinely by the International GPS Service for Geodynamics (IGS) under the International Association of Geodesy (IAG) is accurate to less than submeter. Since the precise orbit/clock is free from selective availability (SA) errors, accurate point positioning and orbit determination can ...
M. Murata, M. Harigae, T. Tsujii
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Signal-in-Space Range Error Analysis of the Simulated Broadcast Ephemerides for the Kepler System. [PDF]
, 2022 Kepler navigation system is a DLR’s proposal for the next generation of GNSS. It comprises a constellation of Galileo-like satellites augmented by Low Earth Orbit (LEO) satellites and exploits optical inter-satellite links (OISLs) for constellation-wide clock synchronization, communication and precise ranging.
Michalak, Grzegorz +5 more
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Measurement Science and Technology
Abstract Autonomous onboard orbit determination of low earth orbit (LEO) satellite using global navigation satellite system (GNSS) broadcast ephemerides has become increasingly important for time-critical space geodetic applications, such as GNSS radio occultation and satellite altimetry. With the full operational
Xiang Chen +6 more
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Abstract Autonomous onboard orbit determination of low earth orbit (LEO) satellite using global navigation satellite system (GNSS) broadcast ephemerides has become increasingly important for time-critical space geodetic applications, such as GNSS radio occultation and satellite altimetry. With the full operational
Xiang Chen +6 more
openaire +1 more source