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《Science of Surveying and Mapping》 2017-01
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Accuracy analysis of precise orbit determination of GRACE satellites based on zero-difference methods

WAN Lihua;CHEN Wenjian;GAO Changyin;HUANG Baosen;School of Geodesy and Geomatics,Wuhan University;Institute of Remote Sensing and Digital Earth,Chinese Academy of Sciences;  
Onboard GPS technique has been one of the most important technologies for POD(Precise Orbit Determination)recently due to the performance improvement of GPS receiver and the accuracy improvement of satellites ephemeris and clock error.In this paper,precise orbits of GRACE satellites are determined with both reduced-dynamic method and kinematic method and then are compared to the final science orbit form Jet Propulsion Laboratory.As the results show,both reduced-dynamic method and kinematic method can achieve the accuracy of centimeter.Besides,the reduced-dynamic method performs a little bit better with a higher accuracy than the kinematic method when using the same ephemeris and clock error products.Furthermore,the accuracy of real-time POD is also better than 10 cm.
【CateGory Index】: P228.4
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