Results 91 to 100 of about 32,900 (194)
Absolute Timing of the Crab Pulsar with RXTE
, 2004 We have monitored the phase of the main X-ray pulse of the Crab pulsar with the Rossi X-ray Timing Explorer (RXTE) for almost eight years, since the start of the mission in January 1996. The absolute time of RXTE's clock is sufficiently accurate to allow
Andrew G. Lyne +6 more
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The changing accretion states of the intermediate polar MU Camelopardalis
, 2008 We study the timing and spectral properties of the intermediate polar MU Camelopardalis (1RXS J062518.2+733433) to determine the accretion modes and the accretion geometry from multi-wavelength, multi-epoch observational data. Light curves in different
A. D. Schwope +27 more
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Precise Orbit Determination of GPS Satellites for Real Time Applications [PDF]
Journal of Astronomy and Space Sciences, 2001 The accuracy of GPS applications is heavily dependent on the satellite ephemeris and earth orientation parameter. Specially applications like as the real time monitoring of troposphere and ionosphere require real time or predicted ephemeris and earth ...
Hyung-Chul Lim +4 more
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Lunar targeting study: Lunar and planetary Ephemeris tapes [PDF]
The Univac 1108 computer tape data formats are documented for the ephermeris tape generated by the Jet Propulsion Laboratory and the ephemeris tape used by the Quick Response Targeting Program (QRTP).
Green, W. G., Matthys, V. J.
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Applied SciencesThis study addresses the issue of atmospheric delay correction for the rational polynomial coefficient (RPC) model associated with spaceborne synthetic aperture radar (SAR) imagery under conditions lacking ephemeris data, proposing a novel approach to ...
Doudou Hu +3 more
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Comparison of circular orbit and Fourier power series ephemeris representations for backup use by the upper atmosphere research satellite onboard computer [PDF]
The Upper Atmosphere Research Satellite (UARS) is a three-axis stabilized Earth-pointing spacecraft in a low-Earth orbit. The UARS onboard computer (OBC) uses a Fourier Power Series (FPS) ephemeris representation that includes 42 position and 42 velocity
Kast, J. R.
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Symposium - International Astronomical Union, 1959 In this article is described the measurement of time from a more general point of view than has been taken before. It is shown that mean solar time and ephemeris time are two particular applications of the general principle of measuring time by observing angular motions, a principle that can be applied to any angular motion whatever, provided that an ...
openaire +1 more source
The K2 and TESS Synergy. III. Search and Rescue of the Lost Ephemeris for K2's First Planet
The Astronomical JournalK2-2 b/HIP 116454 b, the first exoplanet discovery by K2 during its Two-Wheeled Concept Engineering Test, is a sub-Neptune (2.5 ± 0.1 R _⊕ , 9.7 ± 1.2 M _⊕ ) orbiting a relatively bright ( K _S = 8.03) K-dwarf star on a 9.1 day period. Unfortunately, due
Erica Thygesen +15 more
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ARMA Prediction of SBAS Ephemeris and Clock Corrections for Low Earth Orbiting Satellites
International Journal of Aerospace Engineering, 2015 For low earth orbit (LEO) satellite GPS receivers, space-based augmentation system (SBAS) ephemeris/clock corrections can be applied to improve positioning accuracy in real time.
Jeongrae Kim, Mingyu Kim
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A 16-parameter GEO Broadcast Ephemeris [PDF]
Journal of Geodesy and Geoinformation Science, 2018 Currently, the broadcast ephemerides used in GEOs are same as those of the MEOs and IGSOs in the BeiDou navigation constellation. However, a trade-off strategy, i.e.
Zhongkai ZHANG,Lan DU,Li LIU,Feng HE,Yu LU,Peiyuan ZHOU
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