Results 101 to 110 of about 8,397 (209)
Phase 1 Navstar/GPS ephemeris and space vehicle clock performance summary [PDF]
The Navstar/Global Positioning System (GPS) is considered. The issue of control segment accuracy in predicting space vehicle (SV) clock and ephemeris states for broadcast to the user community is addressed.
Bierman, A. B.
core +1 more source
Long and short-term changes of Keplerian elements and correction coefficients of GPS satellites [PDF]
, 2020 413-418In satellite geodesy, the motion of artificial satellites has a crucial importance and the satellite’s position is the core point in the geodetic network.
Maciuk, Kamil
core
WASP-South detection of HD219666b transits provides an accurate ephemeris [PDF]
arXiv, 2019 The hot-Neptune HD219666b (= TOI-118.01) was an early discovery from Sector 1 of the TESS transit survey. Being a rare "Neptune desert" planet, and transiting a bright, V = 9.9 star, it is a prime target for further study including atmospheric characterisation. Targeting exoplanet transits with major facilities such as HST and the imminent JWST depends
arxiv
The optical ephemeris and X-ray variability of 4U 1735-44 (V926 Sco) [PDF]
arXiv, 2012 Optical observations of the low mass X-ray binary 4U 1735-44 were obtained during 1997-2007 and combined with earlier published observations from 1984-1993 to refine the ephemeris for the system. The linear fit for the time of maximum optical light has the ephemeris HJD = 2445904.0494(90) + [ N x 0.19383222(29)] with a value of chi^2 = 253.5$ for 16 ...
arxiv
BDS-3 Broadcast Ephemeris Orbit Correction Model Based on Improved PSO Combined with BP Neural Network. [PDF]
Comput Intell Neurosci, 2022 Peng J, Liu F, Hu W.
europepmc +1 more source
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
Accuracy Improvement of GNSS and Real Time Kinematic Using Egyptian Network as a Case Study [PDF]
, 2013 Differential Global Positioning system (DGPS) is an observation technique that can be used to reduce the ionosphere effects arising in ordinary GNSS. DGPS technique is used to increase the GNSS accuracy by reducing error associated with pseudo range but ...
Ehigiator – Irughe, R. +2 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
The Broadcaster-Repacking Problem [PDF]
arXiv, 2016 The Federal Communications Commission's (FCC's) ongoing Incentive Auction will, if successful, transfer billions of dollars of radio spectrum from television broadcasters to mobile-network operators. Hundreds of broadcasters may go off the air. Most of those remaining on the air, including hundreds of Canadian broadcasters not bidding, will have to ...
arxiv
Networked differential GPS system [PDF]
, 1994 An embodiment of the present invention relates to a worldwide network of differential GPS reference stations (NDGPS) that continually track the entire GPS satellite constellation and provide interpolations of reference station corrections tailored for ...
Kalafus, Rudolph M. +3 more
core +1 more source