Acta Geodaetica et Cartographica Sinica ›› 2019, Vol. 48 ›› Issue (7): 831-839.doi: 10.11947/j.AGCS.2019.20180560

• Geodesy and Navigation • Previous Articles     Next Articles

Comparison and analysis of two orbit determination methods for BDS-3 satellites

YANG Yufei1,2, YANG Yuanxi3,4, HU Xiaogong5, TANG Chengpan5, ZHAO Liqian5, XU Junyi2   

  1. 1. Information Engineering University, Zhengzhou 450001, China;
    2. Beijing Satellite Navigation Center, Beijing 100094, China;
    3. National Key Laboratory of Geo-information Engineering, Xi'an 710054, China;
    4. Xi'an Research Institute of Surveying and Mapping, Xi'an 710054, China;
    5. Shanghai Astronomical Observatory, Shanghai 200030, China
  • Received:2018-12-04 Revised:2019-05-15 Online:2019-07-20 Published:2019-07-26
  • Supported by:
    The National Key Research and Development Project (Nos. 2016YFB0501700;2016YFB0501701);The National Natural Science Foundation of China (No. 41374019)

Abstract: The basic system of BeiDou-3 (or simply called BDS-3) navigation satellite system has been completed by the end of 2018, and the whole system is planned to be completed in 2020. The precise orbit is the pre-condition of high-performance global service. The observation noise and ranging accuracy of Inter-satellite links (ISL) were analyzed based on the basic constellation of 18 satellites. The joint orbit determination experiment of the basic system was conducted based on both 12 regional stations (RS) within Chinese mainland and ISLs, and the results were compared with orbits only based on regional stations. The overlapping orbit difference (OOD), orbit prediction accuracy and satellite laser ranging (SLR) validation accuracy of both methods were analyzed. The results show that the observation noise is about 2.9 cm and ranging accuracy is about 4.4 cm. The 3D position RMS (root mean square) of ODDs for RS mode is about 66.7 cm. The accuracy of 3D position is improved by 76.9% after ISL observations are added. The 3D position accuracy of 24-hour orbit prediction can also be decreased from 114 to 20.3 cm, improved by 83.2%. The SLR validation accuracy of BDS-3 satellite orbit is about 8.4 cm, which is much better than that of BDS-2.

Key words: BDS-3, inter-satellite link, overlapping orbit difference, orbit prediction, SLR validation

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