Full
Outline
To enhance the computational efficiency of filter-based joint reduced-dynamic precise orbit determination (POD) for LEO satellites and GNSS, and to strengthen its feasibility for realtime applications, this study performs a simplified analysis and validation of the dynamical parameters to be estimated for LEO satellites. Based on science orbit data from seven LEO satellites during 2019 to 2024, it is found that Swarm-A/C and GRACE-C/D during periods of high solar activity exhibit relatively large estimated accelerations (90 to 140 nm/s2), while the remaining satellites show smaller estimated accelerations (≤30 nm/s2). Validation through four designed POD schemes demonstrates that when the estimated acceleration is small, the best orbit accuracy can be achieved without introducing any dynamical parameters. If the estimated acceleration is large, only adding an atmospheric drag scaling parameter yields optimal accuracy. Simulation experiments further show that in a joint POD scenario involving 120 LEO satellites and BDS-3 satellites, the proposed simplified LEO dynamical parameter model improves computational efficiency by about 30% compared with traditional models, thereby enhancing the realizability of realtime joint orbit determination.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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