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Validation of an Autonomous Multi-Satellite Navigation Filter Against Precision Orbit Ephemerides
ION GNSS+, The International Technical Meeting of the Satellite Division of The Institute of Navigation, 2020To prepare for various upcoming flight demonstrations of autonomous multi-satellite systems technology, Emergent Space Technologies performed a validation of its multi-satellite navigation filter, NAV, using real GPS data and precise post-processed orbits.
Jennifer King +2 more
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First Use of IGEX Precise Ephemerides for Intercontinental GLONASS P-Code Time Transfer
Journal of Geodesy, 2001Until recently, the Global Positioning System (GPS) was the only operational means of distributing time to an arbitrary number of users and of synchronizing clocks over large distances with a high degree of precision and accuracy. Over the last few years it has been shown that similar performance can be achieved using the Russian Global Navigation ...
W Lewandowski
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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
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IGS Combination of Precise GPS Satellite Ephemerides and Clocks
1996Since January 1, 1994, the Geodetic Survey Division (GSD) of Natural Resources Canada (formerly Energy Mines and Resources, EMR) has been combining and comparing the GPS satellite ephemerides and clock corrections produced by the seven Analysis Centres contributing to the International GPS Service for Geodynamics (IGS).
Y. Mireault, J. Kouba, F. Lahaye
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Status of the CNES precise orbit ephemerides for Sentinel-3A
2016The Sentinel-3A spacecraft was launched by the European Space Agency on February 16, 2016, to extend the continuous record of accurate sea surface height measurements performed on the polar Sun-synchronous orbit, begun in 1991 by the ERS mission and continued in 2002 by the Envisat mission.
Couhert, Alexandre +4 more
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An improved method for detecting BeiDou signal-in-space anomalies from precise ephemerides
Acta Geodaetica et Geophysica, 2019The signal-in-space (SIS) anomalies caused by satellites and control segments can greatly affect the reliability and safety of navigation and positioning users. The prior information associated with the failure of the Advanced Receiver Autonomous Integrity Monitoring (ARAIM) algorithm were obtained by the evaluation of SIS failure rates broadcasted ...
Lihong Fan +7 more
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The dynamics of global positioning system orbits and the determination of precise ephemerides
Journal of Geophysical Research: Solid Earth, 1989Analytical orbit perturbation theory suggests that the errors in the ephemerides of the Global Positioning System (GPS) satellites should be mostly resonant effects that can be corrected by adjusting a few parameters in a simple empirical acceleration formula, despite the complexity of their causes (mismodeling of gravity, radiation pressure, etc.), at
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High-Precision Ephemerides of Planets—EPM and Determination of Some Astronomical Constants
Solar System Research, 2005The latest version of the planetary part of the numerical ephemerides EPM (Ephemerides of Planets and the Moon) developed at the Institute of Applied Astronomy of the Russian Academy of Sciences is presented. The ephemerides of planets and the Moon were constructed by numerical integration in the post-Newtonian metric over a 140-year interval (from ...
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Icarus, 2010
Astrometric satellite positions are derived from timings of their eclipses in the shadow of Jupiter. The 548 data points span 20 years and are accurate to about 0.006 arcsec for Io and Europa and about 0.015 arcsec or better for Ganymede and Callisto.
Anthony Mallama +3 more
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Astrometric satellite positions are derived from timings of their eclipses in the shadow of Jupiter. The 548 data points span 20 years and are accurate to about 0.006 arcsec for Io and Europa and about 0.015 arcsec or better for Ganymede and Callisto.
Anthony Mallama +3 more
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Broadcast vs. precise GPS ephemerides: a historical perspective
GPS Solutions, 2003David L. M. Warren, John F. Raquet
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