On GPS data quality of GRACE-FO and GRACE satellites: effects of phase center variation and satellite attitude on precis
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On GPS data quality of GRACE‑FO and GRACE satellites: effects of phase center variation and satellite attitude on precise orbit determination Yaowei Xia1 · Xin Liu1 · Jinyun Guo1 · Zhouming Yang1 · Linhu Qi1 · Bing Ji2 · Xiaotao Chang3 Received: 17 April 2020 / Accepted: 9 October 2020 © Akadémiai Kiadó 2020
Abstract As the gravity formation flying spacecraft jointly developed by National Aeronautics and Space Administration and German Research Centre for Geosciences, the Gravity Recovery and Climate Experiment (GRACE) and GRACE follow-on (GRACE-FO) satellites have adopted the same K-band ranging system and orbit design in order to detect the Earth’s gravity field information. Different from the BlackJack receiver onboard GRACE, a TriG GNSS receiver is loaded on the GRACE-FO satellites. The orbit determination accuracy of GRACE is better than 2.5 cm, but for GRACE-FO there is no comprehensive assessment of orbit accuracy. We discuss the quality of Global Positioning System data, as well as effects of phase center variation (PCV) model and attitude for GRACE and GRACEFO. The results show that there is no significant difference in terms of rate of change in ionospheric delay (IOD) and multipath effect, which suggests that the performance of TriG receiver is as excellent as that of BlackJack receiver. After using PCV corrections, the root mean square (RMS) errors of kinematic and reduced-dynamic (RD) orbit residuals decrease by 0.4–0.5 and 0.6–0.9 mm, respectively. Satellite laser ranging RMS errors for RD orbit solutions are lower than 2.59 cm whether PCV corrections are used or not. The effect of attitude data on kinematic and RD orbits indicates that nominal attitude data can reliably replace measured attitude data in GRACE-FO orbit determination. Keywords GRACE · GRACE-FO · Space-borne GPS · Precise orbit determination · Phase center variation · Multipath effect · Ionospheric delay · Nominal attitude
* Xin Liu [email protected] 1
College of Geodesy and Geomatics, Shandong University of Science and Technology, Qingdao 266590, China
2
Department of Navigation Engineering, Naval University of Engineering, Wuhan 430033, China
3
Land Satellite Remote Sensing Application Center of MNR, Beijing 100048, China
13
Vol.:(0123456789)
Acta Geodaetica et Geophysica
1 Introduction The precise orbit determination (POD) capability based on space-borne Global Positioning System (GPS) observations has been successfully verified on TOPEX/Poseidon satellite for the first time (Melbourne et al. 1994). Since then, more and more GPS receivers have been employed on low-earth orbit (LEO) satellites so as to meet the needs of various scientific missions for high-precision orbit (Kang et al. 2003; Luthcke et al. 2003; Jäggi et al. 2006; Guo et al. 2012, 2013). The space-borne GPS POD technique has gradually become the main means of determining precise orbits of LEO satellites due to its high sampling rate and data accuracy. Since the Gravity Recovery and Climate Experiment (GRACE) satellites were launched in March 2
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