Evaluation of Accuracy of GSI's Ephemerides for GPS Satellites by Direct Comparison of Orbits.
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概要
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Internal precision and accuracy of ephemerides of the Global Positioning System (GPS) satellites calculated by the Geographical Survey Institute (GSI) using regional data are evaluated in several ways. Comparison of the GSI ephemerides of various arcs shows that at least a 3-day arc is necessary to obtain stable orbits using regional data. Comparison of the ephemerides over overlapping period of analysis shows that internal preci sion of more than half of the satellites is smaller than 10 m of RMS difference. Comparison with precise ephemerides determined by the Jet Propulsion Laboratory (JPL) using global data shows that our ephemeris coincides with the JPL's ephemeris within 3-21 m of the RMS difference for regional arcs of orbit over Japan and 4-30 m for global arc. Both internal precision and accuracy are better for regional arcs than for global arcs. Systematic trend shown in residual plot suggests possibility to improve accuracy of the GSI ephemerides by model refinements.
- 日本測地学会の論文
日本測地学会 | 論文
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