Precision orbit determination for the Geosat Exact Repeat Mission
作者： C. K. Shum , D. N. Yuan , J. C. Ries , J. C. Smith , B. E. Schutz
关键词: Geodesy 、 Ephemeris 、 Orbit (dynamics) 、 Remote sensing 、 Orbit determination 、 Sea-surface height 、 Satellite laser ranging 、 Satellite 、 Geopotential 、 Altimeter 、 Mathematics
摘要: Precise ephemerides have been determined for the Navy's Geodesy Satellite (Geosat) Exact Repeat Mission (ERM) using an improved gravity field model, PTGF-4A (Shum et al., 1989). The Geosat orbits were computed in a terrestrial reference system which is tied to defined by satellite laser ranging (SLR) LAGEOS through survey between TRANET Doppier receiver and SLR located at Wettzell, Federal Republic of Germany. remaining Doppler tracking station coordinates estimated simultaneously with geopotential solution. In this analysis, three continuous 17-day orbits, 46-station data global altimeter crossover data, residual root-mean-square (rms) 20 cm, indicating that radial orbit error order cm. based on collected 7-station OPNET network same level accuracy. Collinear sea surface height analysis two repeat cycles yields rms difference 16 Spectral indicates long-wavelength has reduced significantly. Finally, time tag bias, 54 days ERM 5±3 ms.
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