Precision analysis of broadcast ephemeris for medium and high orbit satellites

Details Precision analysis of broadcast ephemeris for medium and high orbit satellites Precision analysis of broadcast ephemeris for medium and high orbit satellites

Mar 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006pabei..24...81h&link_type=abstract

Progress in Astronomy (ISSN 1000-8349), Vol. 24, No. 1, p. 81 - 88 (2006)

Astronomy and Astrophysics

Astronomy

Astrometry, Satellite Navigation System (Sns), Broadcast Ephemeris, Meo (Medium Earth Orbits), Igso (Inclined Geosynchronous Orbits), Geo (Geostationary Earth Orbits)

Scientific paper

The broadcast ephemeris parameters for GPS may be used in other satellite navigation systems. Usually a satellite navigation system includes different kinds of satellites, for example, MEO (Medium Earth Orbits) satellites, IGSO (Inclined GeoSynchronous Orbits) satellites and GEO (Geostationary Earth Orbits) satellites. This paper studies the accuracy of broadcast ephemeris for above different kinds of satellite orbits using the broadcast ephemeris parameters for GPS, and especially analyses the accuracy of broadcast ephemeris for GEO satellites with near-zero-inclination. For MEO satellites, the fitting accuracy for 2 hours fitting arc can reach cm magnitude. For IGSO satellites and GEO satellites with near-zero-inclination, the fitting accuracy for 4 hours fitting arc can reach 0.1 m, and the radial position error is cm magnitude. For GEO satellites with near-zero-inclination, the fitting accuracy is not good enough because of the correlation of parameters. A method of coordinate transformation is adopted to avoid correlation and to improve the fitting accuracy. Using this method for GEO satellites with near-zero-inclination, the fitting accuracy for 4 hours fitting arc can reach 0.1 m, and the radial position error is cm magnitude.

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