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http://dx.doi.org/10.12673/jant.2014.18.5.421

An Analysis on the Long-Term Variation of the GPS Broadcast Ephemeris Errors  

Kim, Mingyu (School of Aerospace and Mechanical Engineering, Korea Aerospace University)
Kim, Jeongrae (School of Aerospace and Mechanical Engineering, Korea Aerospace University)
Publication Information
Journal of Advanced Navigation Technology / v.18, no.5, 2014 , pp. 421-428 More about this Journal
Abstract
GPS satellite positions can be obtained from the navigation message transmitted from the GPS satellite. In this paper, the accuracy of broadcast orbit and clock are analyzed by comparing with the NGA precise ephemeris. For analyzing global and local orbit errors in 2004 to 2013, GPS satellite visibilities are calculated in Korea. Local RMS of 3D orbit error and SISRE are 4 cm and 3 cm less than global RMS of 3D orbit errors and SISRE. Orbit and clock errors are calculated for each GPS satellite Block for 10 years. SISRE of Block IIA satellites are 2.8 times greater than Block IIF satellites. The correlation between orbit errors and shadow condition is analyzed. The orbit errors in shadow is 2.1% higher than that in sunlight. Correlation analysis between the orbit errors and solar/geomagnetic index shows that orbit errors has a high correlation with from 2004 to 2008. However, the correlation became low since 2009.
Keywords
Broadcast ephemeris; NGA precise ephemeris; Orbit and clock error; SISRE;
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  • Reference
1 M. Epstein et al., "GPS IIR rubidium clocks: in-orbit performance aspects," in 35th Annual Precise Time and Time Interval Meeting, Clifton, pp.117-134, 2004.
2 M. S. B. Starr et al., "A long-term statistical analysis of the accuracy of GPS and GLONASS broadcast orbit and clock models," in Proceedings of the 17th International Technical Meeting of the Satellite Division of The Institute of Navigation, Long Beach: NY, pp.2095-2103, 2004.
3 C. Cohenour, F. V. Graas, "A GPS orbit and clock error distributions," in Proceeding of the institute of Navigation Pacific PNT, Honolulu: HI, pp.946-958, 2013.
4 O. Montenbruck et al., Broadcast versus precise ephemerides: a multi-GNSS perspective, GPS Solutions, Online, June. 2014.
5 International GNSS Service. The IGS Product table of GNSS satellite ephemerides [Internet]. Available: http://igscb.jpl.nasa.gov/components/prods.html
6 Official U.S. Government about Global Positioning System. The NGA Modernization plan [Internet]. Available: http://www.gps.gov/systems/gps/control/
7 R. B. Langley et al., "The GPS broadcast orbits: an accuracy analysis," in Proceeding of New Trends in Space Geodesy, Warsaw: Poland, 2000.
8 D. L. M. Warren, J. F. Raquet, "Broadcast vs precise GPS ephemerides: a historical perspective," GPS Solutions, Vol. 7, No. 3, pp. 151-156, Dec. 2003.   DOI