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

doi:10.11947/j.AGCS.2019.20180560

Abstract

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

CLC Number:

P228

YANG Yufei, YANG Yuanxi, HU Xiaogong, TANG Chengpan, ZHAO Liqian, XU Junyi. Comparison and analysis of two orbit determination methods for BDS-3 satellites[J]. Acta Geodaetica et Cartographica Sinica, 2019, 48(7): 831-839.

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