Results 201 to 210 of about 40,352 (222)
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Empire Survey Review, 1955
A New measure of time, Ephemeris Time, has recently been introduced by astronomers. The purpose of this short article is to explain briefly why this has been necessary and how it will affect navigation.
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A New measure of time, Ephemeris Time, has recently been introduced by astronomers. The purpose of this short article is to explain briefly why this has been necessary and how it will affect navigation.
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IEEE Transactions on Aerospace and Electronic Systems
The modeling and compensation of timing and spatial ephemeris errors of low Earth orbit (LEO) satellites is considered. First, models are derived capturing the effect of temporal and spatial errors of publicly available uncertain LEO ephemerides on ...
S. Hayek, Z. M. Kassas
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The modeling and compensation of timing and spatial ephemeris errors of low Earth orbit (LEO) satellites is considered. First, models are derived capturing the effect of temporal and spatial errors of publicly available uncertain LEO ephemerides on ...
S. Hayek, Z. M. Kassas
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Ephemeris and Timing Error Disambiguation Enabling Precise LEO PNT
IEEE Transactions on Aerospace and Electronic SystemsThe ephemeris and timing errors of low Earth orbit (LEO) satellites are modeled, leading to an approach to disambiguate these errors from pseudorange-type measurements.
Joe Saroufim, Z. M. Kassas
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Single Satellite Emitter Geolocation in the Presence of Oscillator and Ephemeris Errors
IEEE Aerospace Conference, 2020This paper addresses high-accuracy geolocation of a ground-level, uncooperative RF emitter using a single low earth orbit (LEO) satellite. It is meant to be a real-time, single-pass solution that requires only a few seconds of Doppler and Doppler Rate ...
P. Ellis, F. Dowla
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Dual-Satellite Geolocation With Ephemeris Correction and Uncertainty Mapping
IEEE Transactions on Aerospace and Electronic Systems, 2020In this paper, we demonstrate that the uncertainty of the dual-satellite ephemeris must be included in order for the geolocation covariance to be accurate. Without the inclusion of this additional error source, the covariance is no longer consistent with
J. Geeraert, J. McMahon
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PETREL19: a new numerical solution of planetary and lunar ephemeris
Celestial mechanics & dynamical astronomy, 2023W. Tian
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Role of lunar laser ranging in realization of terrestrial, lunar, and ephemeris reference frames
Journal of Geodesy, 2019Three possible applications of lunar laser ranging to space geodesy are studied. First, the determination of daily Earth orientation parameters (UT0 and variation of latitude) is rarely used nowadays in the presence of all-year VLBI, SLR, and GNSS data ...
D. Pavlov
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Bibliothèque de l'école des chartes, 1910
Léonard Émile-G. Ephemeris Campanographica. In: Bibliothèque de l'école des chartes. 1910, tome 71. pp. 479-480.
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Léonard Émile-G. Ephemeris Campanographica. In: Bibliothèque de l'école des chartes. 1910, tome 71. pp. 479-480.
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Assessment of BDS-3 global positioning service: ephemeris, SPP, PPP, RTK, and new signal
GPS Solutions, 2020Junbo Shi +3 more
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