Two-way ranging and communication between satellites by inter-satellite link (ISL) is an important innovative design of BDS-3, which can make up for the disadvantage of regionally distributed network and realize the tracking and measurement for the whole arc of navigation satellites. By introducing ISL measurements into orbit determination processing, the orbit accuracy can be effectively improved. The influence of ISL measurement geometry on satellite orbit determination accuracy is evaluated. Taking the post-processed satellite orbit solutions provided by IGS as references, the orbit accuracy of BeiDou satellites under different conditions is evaluated. The results show that in the case no ISL measurements, the user ranging error (URE) of satellite orbit is about 0.3 m. With all ISLs used, the orbital URE is below 0.08 m. Then, the influence of the number of the ISLs on orbit determination accuracy is further investigated. The results show that when the number of ISLs between satellites is reduced by 17%, 24% and 40%, respectively, the accuracy loss of orbit in radial component is only at millimeter level, and the loss in tangential and normal component is at centimeter level, thus the accuracy loss can be neglected. Even if a satellite has only two ISLs, the orbital URE is only increased to 12 cm, which indicates that the satellite orbit can still maintain relatively high accuracy in the case of only a few links. This provides a reference for the operator to formulate the plan of ISL.
Influence of Inter-satellite Link Geometry on Orbit Determination Accuracy for BDS-3
Lect. Notes Electrical Eng.
China Satellite Navigation Conference (CSNC 2022) Proceedings ; Kapitel : 27 ; 311-321
2022-05-05
11 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
Influence of Inter-satellite Link Geometry on Orbit Determination Accuracy for BDS-3
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