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Orbit and Positioning Accuracy for New Generation Beidou Satellites during the Earth Eclipsing Period

Published online by Cambridge University Press:  26 March 2018

Xiaojie Li ,
Xiaogong Hu ,
Rui Guo ,
Chengpan Tang ,
Shanshi Zhou ,
Shuai Liu  and
Jianbing Chen
Xiaojie Li*
Affiliation:
(Beijing Satellite Navigation Center, Beijing 100094, China) (Shanghai Key Laboratory for Space Positioning and Navigation, Shanghai 200030, China) (State Key Laboratory of Geodesy and Earth's Dynamics, Wuhan 430077, China)
Xiaogong Hu
Affiliation:
(Shanghai Key Laboratory for Space Positioning and Navigation, Shanghai 200030, China) (Shanghai Astronomical Observatory, Shanghai 200030, China)
Rui Guo
Affiliation:
(Beijing Satellite Navigation Center, Beijing 100094, China)
Chengpan Tang
Affiliation:
(Shanghai Key Laboratory for Space Positioning and Navigation, Shanghai 200030, China) (Shanghai Astronomical Observatory, Shanghai 200030, China)
Shanshi Zhou
Affiliation:
(Shanghai Key Laboratory for Space Positioning and Navigation, Shanghai 200030, China) (Shanghai Astronomical Observatory, Shanghai 200030, China)
Shuai Liu
Affiliation:
(Beijing Satellite Navigation Center, Beijing 100094, China)
Jianbing Chen
Affiliation:
(China Top Communication Co., Ltd., Beijing 100088, China)
*
(E-mail: lxjant1984@126.com)
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Abstract

The Beidou System (BDS) started functioning at the end of 2012. The Yaw-Steering (YS) attitude mode for Inclined Geosynchronous Orbit (IGSO) and Medium Earth Orbit (MEO) satellites in BDS ensures that the solar panels face the Sun. The orbit radial accuracies for IGSO/MEO satellites are 0·5 m and the User Equivalent Range Errors (UERE) are 1·5 m in YS mode. BDS-2 satellites adopt Orbit-Normal (ON) mode to meet the power supply and thermal control requirements of the satellite during deep Earth eclipse periods. In ON mode, long-term orbit ephemeris accuracy monitoring in the Operational Control System (OCS) of BDS indicates that the orbit accuracies for IGSO/MEOs are reduced to a few hundreds of metres, seriously affecting the positioning accuracy and navigation service capability of the BDS system. Solar Radiation Pressure (SRP) is difficult to model in ON mode. Continuous Yaw-Steering (CYS) mode is available for new generation Beidou satellites launched since 2015. The orbit accuracies for these new generation Beidou (BDS-3) satellites were estimated based on BDS monitoring station data and SRP models including ECOM 9/5/3. The evaluation method consisted of four steps, namely, orbit internal consistency analysis, UERE calculation, Satellite Laser Ranging (SLR) data fitting Root Mean Square (RMS) determinations and positioning performance analysis; the data gathering period lasted for more than 60 days and included two CYS periods and one ON period. The experiments showed that the orbit accuracy of the radial component in CYS mode for the BDS-3 satellites degrades by 2 to 3 cm and positioning accuracy degrades only by 1 cm over that in YS mode which is just a small reduction in accuracy compared with the decimetre-level BDS orbit accuracy and the metre-level single point positioning accuracy with BDS pseudorange data. This overcomes declining orbit and positioning accuracy issues in ON mode for BDS-2 satellites. Other results also show that the reliability of BDS has been improved.

Keywords

New generation Beidou satellitesEarth eclipsing periodContinuous yaw-steering modeGlobal satellite laser ranging
Type
Research Article
Information
The Journal of Navigation , Volume 71 , Issue 5 , September 2018 , pp. 1069 - 1087
Copyright
Copyright © The Royal Institute of Navigation 2018 

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