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题名: Precise orbit determination of the Fengyun-3C satellite using onboard GPS and BDS observations
作者: Li, Min; Li, Wenwen; Shi, Chuang; Jiang, Kecai; Guo, Xiang; Dai, Xiaolei; Meng, Xiangguang; Yang, Zhongdong; Yang, Guanglin; Liao, Mi
作者部门: 空间环境部
通讯作者: Li, WW (reprint author), Wuhan Univ, GNSS Res Ctr, 129 Luoyu Rd, Wuhan 430079, Hubei, Peoples R China.
关键词: BDS ; GPS ; Multipath error ; Data quality ; Precise orbit determination
刊名: JOURNAL OF GEODESY
ISSN号: 0949-7714
出版日期: 2017
卷号: 91, 期号:11, 页码:1313-1327
收录类别: SCI
项目资助者: National Key Research and Development Program of China [2016YFB0501800] ; Natural Science Foundation of China [41574027, 41325015, 41574030, 41505030] ; Natural Science Key Program of Hubei Province, China [2015CFA057]
英文摘要: The GNSS Occultation Sounder instrument onboard the Chinese meteorological satellite Fengyun-3C (FY-3C) tracks both GPS and BDS signals for orbit determination. One month's worth of the onboard dual-frequency GPS and BDS data during March 2015 from the FY-3C satellite is analyzed in this study. The onboard BDS and GPS measurement quality is evaluated in terms of data quantity as well as code multipath error. Severe multipath errors for BDS code ranges are observed especially for high elevations for BDS medium earth orbit satellites (MEOs). The code multipath errors are estimated as piecewise linear model in grid and applied in precise orbit determination (POD) calculations. POD of FY-3C is firstly performed with GPS data, which shows orbit consistency of approximate 2.7 cm in 3D RMS (root mean square) by overlap comparisons; the estimated orbits are then used as reference orbits for evaluating the orbit precision of GPS and BDS combined POD as well as BDS-based POD. It is indicated that inclusion of BDS geosynchronous orbit satellites (GEOs) could degrade POD precision seriously. The precisions of orbit estimates by combined POD and BDS-based POD are 3.4 and 30.1 cm in 3D RMS when GEOs are involved, respectively. However, if BDS GEOs are excluded, the combined POD can reach similar precision with respect to GPS POD, showing orbit differences about 0.8 cm, while the orbit precision of BDS-based POD can be improved to 8.4 cm. These results indicate that the POD performance with onboard BDS data alone can reach precision better than 10 cm with only five BDS inclined geosynchronous satellite orbit satellites and three MEOs. As the GNOS receiver can only track six BDS satellites for orbit positioning at its maximum channel, it can be expected that the performance of POD with onboard BDS data can be further improved if more observations are generated without such restrictions.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.nssc.ac.cn/handle/122/6076
Appears in Collections:空间环境部_期刊论文

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