An Improved Model for Inter-System Bias Estimation Based on BDS-2/BDS-3 Combined Precise Orbit Determination

被引：0
|
作者：
Hu C. [1 ,2 ,3 ]
Wang Z. [1 ,3 ]
Wang Q. [1 ,3 ]
Rao P. [1 ,3 ]
机构：
[1] Key Laboratory of Land Environment and Disaster Monitoring, Ministry of Natural Resources of the People's Republic of China, China University of Mining and Technology, Xuzhou
[2] School of Spatial Information and Geomatics Engineering, Anhui University of Science and Technology, Huainan
[3] School of Environmental Science and Spatial Informatics, China University of Mining and Technology, Xuzhou
来源：
Wuhan Daxue Xuebao (Xinxi Kexue Ban)/Geomatics and Information Science of Wuhan University | 2021年 / 46卷 / 03期
基金：
中国国家自然科学基金;
关键词：
BDS-2/BDS-3 combined orbit determination; Inter-system bias(ISB); Short-term prediction; Singular value decomposition; Ultra-rapid precise orbit;
D O I：
10.13203/j.whugis20190132
中图分类号：
学科分类号：
摘要：
Objectives: To integrate processing of BDS-2 and BDS-3 satellites observations and to conduct the deeply merged strategy for enhancing the parameter solutions, the differences between BDS-2 and BDS-3 should be considered and analyzed. Methods: Given the differences of BDS-2 and BDS-3 satellites, to fully utilize and fuse the observations, the inter-system bias (ISB) model of BDS-2/BDS-3 combined precise orbit determination is analyzed and improved. Firstly, to improve the accuracy and reliability of ISB, the singular value decomposition is introduced to extract the observation information of adjacent epoch. Secondly, the characteristics of ISB are analyzed, which indicts that the ISBs are significantly presented and related with the types of receivers based on the new signals of BDS-3 and BDS-2. Then, the correlations between ISB and orbit parameters are analyzed; the results suggest that the BeiDou orbit accuracy is affected more significantly than that of GPS. Finally, based on the estimated ISB series, the short-term prediction of ISB model is established by spectral analysis, which is inserted into the ultra-rapid precise orbit determination. Results: With ultra-rapid orbit determination experiments, the proposed ISB prediction and estimation strategies can improve -0.4-1.0 cm and 0.8-4.1 cm for BDS-2 and BDS-3 orbit one-day overlapping, respectively. Conclusions: Therefore, it is meaningful for improving the BDS-2/BDS-3 ultra-rapid combined precise orbit determination with the improved ISB estimation and prediction model. © 2021, Editorial Board of Geomatics and Information Science of Wuhan University. All right reserved.
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页码：360 / 370
页数：10
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