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Impact of GPS Antenna Phase Center Variations on Precise Orbit Determination of the GRACE Satellites

CHEN Meng;MENG Ruizu;YUAN Junjun;College of Geomatics,Shandong University of Science and Technology;  
We use onboard GPS data of GRACE satellites to research the impact of the priori phase center variations(PCV)model by ground calibration and in-flight PCV model,estimated by the residual method.The orbit accuracy is assessed by GFZ precision orbits comparison and SLR checkout.The results show that using prior PCV models can reduce orbit determination accuracy,but using inflight PCV model can improve the orbit determination accuracy(mm level).
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