LUO Jia, NING Jinsheng. Analysis of Time-Variable Gravity Field Exploring Performance with LEO Cluster[J]. Geomatics and Information Science of Wuhan University, 2010, 35(6): 636-638.
Citation:
LUO Jia, NING Jinsheng. Analysis of Time-Variable Gravity Field Exploring Performance with LEO Cluster[J]. Geomatics and Information Science of Wuhan University, 2010, 35(6): 636-638.
LUO Jia, NING Jinsheng. Analysis of Time-Variable Gravity Field Exploring Performance with LEO Cluster[J]. Geomatics and Information Science of Wuhan University, 2010, 35(6): 636-638.
Citation:
LUO Jia, NING Jinsheng. Analysis of Time-Variable Gravity Field Exploring Performance with LEO Cluster[J]. Geomatics and Information Science of Wuhan University, 2010, 35(6): 636-638.
1Laboratory of Geospace Environment and Geodesy,Wuhan University,129 Luoyu Road,Wuhan 430079,China;2School of Geodesy and Geomatics,Wuhan University,129 Luoyu Road,Wuhan 430079,China
We studied a so-called crossover point approach for low-cost LEO cluster precise orbit data to recover the global time-variable information without accelerometer systems (ACC) or k-band ranging system (KBR) measurements.This approach can reduce the non-gravitational force effects on LEO,obviously.We analyzed the 20 d data coverage and the orbit radial error effects on this approach.With 20 d precise orbital data,the crossover points have well global coverage.On the other hand,the radial orbit accuracy of COSMIC data is about 15 cm at 800 km orbital altitude.It is not sufficient for the time-variable gravity field recovery with crossover point approach.If the orbital radial component error is reduced to about 1 cm,the time-variable gravity field can be recovery with acceptable accuracy.
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