The inclusion of Low Earth Orbit (LEO) spaceborne GNSS observation or Inter-Satellite Link (ISL) measurement improves strength of normal equation, and then helps to improve ERP accuracy. With a 15-day simulation of BDS-3 ISL measurements and BDS-3 observations from 72 LEO satellites, 10 global stations and 10 Chinese stations, this work studies the impact of LEO satellites and BDS-3 ISL on ERP accuracy. Results show that the introduction of LEO satellites and BDS-3 ISL significantly improves ERP accuracy. Taking the IERS 14 C04 product as a reference, with ground network of 10 global stations, the RMS of polar X, Y coordinate and LOD after introducing 72 LEO satellites are 10.4 μas, 10.8 μas, 3.9 μs, respectively. Compared with ERP accuracy based on solely 10 global stations, the improvement reaches 66.8%, 74.0%, 62.1%, respectively. The accuracy is equivalent to that of using 115 global stations, and the polar coordinate accuracy is better than the case of introducing BDS-3 ISL. Based on 10 Chinese stations, the RMS of polar X, Y coordinate and LOD with BDS-3 ISL are 16.3 μas, 39.8 μas, 7.9 μs, respectively. The contribution of BDS-3 ISL is more pronounced than that of 72 LEO satellites. ERP results based on Chinese stations indicate that the polar Y coordinate accuracy is always worse than the X component, which is not found in results of global stations. Furthermore, analysis of correlation indicates that the inclusion of LEO satellites or BDS-3 ISL reduces correlation between estimated parameters.
Earth Rotation Parameters Determination with BDS-3/LEO Simulations Under Small-Scale Ground Networks
Lect. Notes Electrical Eng.
China Satellite Navigation Conference (CSNC 2022) Proceedings ; Chapter : 10 ; 102-112
2022-05-05
11 pages
Article/Chapter (Book)
Electronic Resource
English
Earth Rotation Parameters (ERP) , Low Earth Orbit (LEO) satellite , Inter-Satellite Link (ISL) , Integrated adjustment Engineering , Communications Engineering, Networks , Signal, Image and Speech Processing , Aerospace Technology and Astronautics , Control, Robotics, Mechatronics , Computer Applications , Geography, general
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