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Inter-Satellite Link Enhanced Orbit Determination for BeiDou-3

Published online by Cambridge University Press:  13 June 2019

Yufei Yang*
Affiliation:
(Information Engineering University, Zhengzhou, 450001, China) (Beijing Satellite Navigation Center, Beijing 100094, China)
Yuanxi Yang
Affiliation:
(Xi'an Research Institute of Surveying and Mapping, Xi'an 710054, China) (National Key Laboratory of Geo-information Engineering, Xi'an 710054, China)
Xiaogong Hu
Affiliation:
(Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China)
Jinping Chen
Affiliation:
(Beijing Satellite Navigation Center, Beijing 100094, China)
Rui Guo
Affiliation:
(Beijing Satellite Navigation Center, Beijing 100094, China)
Chengpan Tang
Affiliation:
(Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China)
Shanshi Zhou
Affiliation:
(Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China)
Liqian Zhao
Affiliation:
(Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China)
Junyi Xu
Affiliation:
(Beijing Satellite Navigation Center, Beijing 100094, China)
*
(E-mail: gnssyyf@163.com)

Abstract

The third generation of the BeiDou navigation satellite system (BDS-3) is a global navigation system, and is expected to be in full operation by 2020. High-precision orbits are a precondition for BDS-3 to provide a highly accurate service, which needs a global tracking and monitoring capability for the operational satellites. However, it is difficult for BDS to construct global ground monitoring stations. Fortunately, Ka-band Inter-Satellite Link (ISL) antennae fitted to the BDS-3 satellites can be used to extend the visible arc of the Medium Earth Orbit (MEO) satellites and to enhance the ground stations for orbit determination. This paper analyses the ISL-enhanced orbit determination for eight BDS-3 satellites, using the data from ten Chinese domestic stations and 13 international Global Navigation Satellite System (GNSS) Monitoring and Assessment System (iGMAS) overseas stations. The results show that the Three-Dimensional (3D) position Root Mean Square (RMS) error of the Overlapping Orbit Differences (OODs) is approximately 1 m when only ten regional stations are used. When the ISL measurements are added, the 3D position RMS error is decreased to 0·5 m, and the accuracy of the 24-hour orbit prediction can also be improved from 2 m to 0·7 m, which is even better than that of the orbits determined using globally distributed stations. It can be expected that with the subsequent launch of BDS-3 satellites and the increasing number of ISLs, the advantage of the ISL enhanced orbit determination will become more significant.

Type
Research Article
Copyright
Copyright © The Royal Institute of Navigation 2019 

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