Influences of Discontinuous Attitudes on GNSS/LEO Integrated Precise Orbit Determination Based on Sparse or Regional Networks

被引：0
作者：
Wang, Yuanxin [1 ,2 ,3 ]
Sun, Baoqi [1 ,2 ,3 ]
Wang, Kan [1 ,2 ,3 ]
Yang, Xuhai [1 ,2 ,3 ]
Zhang, Zhe [1 ,2 ,3 ]
Zhang, Minjian [1 ,2 ,3 ]
Wu, Meifang [1 ,2 ,3 ]
机构：
[1] Chinese Acad Sci, Natl Time Serv Ctr, Xian 710600, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[3] Chinese Acad Sci, Key Lab Time Reference & Applicat, Xian 710600, Peoples R China
来源：
REMOTE SENSING | 2025年 / 17卷 / 04期
基金：
中国国家自然科学基金;
关键词：
low-Earth-orbit satellite; precise orbit determination; global navigation satellite system; attitude; sparse network; GPS; LEO; ADJUSTMENT; VALIDATION; SATELLITES; GRACE;
D O I：
10.3390/rs17040712
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
A uniformly distributed global ground network is essential for the accurate determination of GNSS orbit and clock parameters. However, achieving an ideal ground network is often difficult. When limited to a sparse or regional network of ground stations, the integration of LEO satellites can substantially enhance the accuracy of GNSS Precise Orbit Determination (POD). In practical processing, discontinuities with complicated gaps can occur in LEO attitude quaternions, particularly when working with a restricted observation network. This hampers the accuracy of determining GNSS/LEO integrated orbits. To address this, an investigation was conducted using data from seven LEO satellites, including those from Sentinel-3, GRACE-FO, and Swarm, to evaluate integrated POD performance under sparse or regional station conditions. Particular focus was placed on addressing attitude discontinuities. Four scenarios were analyzed, encompassing both continuous data availability and one-, two-, and three-hour interruptions after one hour of continuous data availability. The results showed that the proposed quaternion rotation matrix interpolation method is reliable for the integrated POD of GNSSs and LEOs with strict attitude control.
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页数：21
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