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Orbit determination and prediction for Beidou GEO satellites at the time of the spring/autumn equinox
Li XiaoJie1; Zhou JianHua1; Hu XiaoGong2; Liu Li1; Guo Rui1; Zhou ShanShi2
2015
Source PublicationSCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
ISSN1674-7348
Volume58Issue:8
AbstractGeostationary (GEO) satellites form an indispensable component of the constellation of Beidou navigation system (BDS). The ephemerides, or predicted orbits of these GEO satellites(GEOs), are broadcast to positioning, navigation, and timing users. User equivalent ranging error (UERE) based on broadcast message is better than 1.5 m (root formal errors: RMS) for GEO satellites. However, monitoring of UERE indicates that the orbital prediction precision is significantly degraded when the Sun is close to the Earth's equatorial plane (or near spring or autumn Equinox). Error source analysis shows that the complicated solar radiation pressure on satellite buses and the simple box-wing model maybe the major contributor to the deterioration of orbital precision. With the aid of BDS' two-way frequency and time transfer between the GEOs and Beidou time (BDT, that is maintained at the master control station), we propose a new orbit determination strategy, namely three-step approach of the multi-satellite precise orbit determination (MPOD). Pseudo-range (carrier phase) data are transformed to geometric range (biased geometric range) data without clock offsets; and reasonable empirical acceleration parameters are estimated along with orbital elements to account for the error in solar radiation pressure modeling. Experiments with Beidou data show that using the proposed approach, the GEOs' UERE when near the autumn Equinox of 2012 can be improved to 1.3 m from 2.5 m (RMS), and the probability of user equivalent range error (UERE)<2.0 m can be improved from 50% to above 85%.
KeywordBeidou system (BDS) Beidou time (BDT) geostationary (GEO) satellite spring equinox/autumn equinox solar radiation pressure time synchronization user equivalent ranging error
Language英语
Funding Project[National Natural Science Foundation of China] ; [Shanghai Key Laboratory of Space Navigation and Position Techniques] ; [Surveying and Mapping Basic Research Program of National Administration of Surveying, Mapping and Geoinformation]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/67628
Collection中国科学院国家天文台
Affiliation1.Beijing Satellite Nav Ctr, Beijing 100094, Peoples R China
2.Shanghai Key Lab Space Nav & Posit Tech, Shanghai 200030, Peoples R China
3.中国科学院国家天文台
Recommended Citation
GB/T 7714
Li XiaoJie,Zhou JianHua,Hu XiaoGong,et al. Orbit determination and prediction for Beidou GEO satellites at the time of the spring/autumn equinox[J]. SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,2015,58(8).
APA Li XiaoJie,Zhou JianHua,Hu XiaoGong,Liu Li,Guo Rui,&Zhou ShanShi.(2015).Orbit determination and prediction for Beidou GEO satellites at the time of the spring/autumn equinox.SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,58(8).
MLA Li XiaoJie,et al."Orbit determination and prediction for Beidou GEO satellites at the time of the spring/autumn equinox".SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY 58.8(2015).
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