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《Journal of Geodesy and Geodynamics》 2006-03
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ERROR ANALYSIS OF IGS PRECISE EPHEMERIS

Li Peng1,2),Shen Zhengkang2,3)and Wang Min1,2)1) Institute of Earthquake Prediction, CEA, Beijing 1000362) Institute ofGeology, CEA, Beijing 1000293) Department ofEarth and Space Sciences, University of California, Los Angeles, CA90095 -1567, USA  
GPS data from the IGS global tracking network from 1994 to 2004 are reprocessed to obtain preciseGPS orbits by use of the ITRF2000 high precision global reference frame, the late geophysical models and appropri-ate error correction models,uniform orbital parameters and Earth rotation models, uniform data processing strategy.The systematic biases and the randomerrors of the IGS precise orbits are evaluated through comparing the IGS orbitswith the reprocessed orbits, and the difference between the IGS claimed and actual orbital errors, especially for theephemeris in the early years is found. The systematic biases of the IGS orbits vary with time, resulted mainly fromover the years adopting different ITRF reference frames, whose differences cannot be completely represented by thetransformation relationships published by IERS. Relative to the reprocessed orbits, the random errors of the IGSprecise orbits has been decressing along with time: about15 -20 cm in 1994, 6 -8 cm in 1998, and less than 5cm since 1999.
【Fund】: 中国地震局地震预测研究所青年科技基金
【CateGory Index】: P228.4
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