Full
MA Huibin, engineer, majors in space geodesy, E-mail: 576214595@qq.com
Outline
To assess the accuracy of Earth rotation parameters(ERP) derived from the current VLBI global observing system(VGOS) observational data, this paper processes data from VGOS observations made between 2019 and 2023. Simultaneously, traditional S-band and X-band VLBI observational data, which were obtained during the same periods as the VGOS data, were also included in the processing. The EOP 14 C04 series provided by the IERS were used as reference values for accuracy assessment. The results show that, during the selected experimental data periods, the average weighted root mean square(WRMS) of the post-fit residuals of time delay from VGOS observational data is 16.77 ps, which is significantly better than the 30.97 ps from the traditional S/X VLBI measurements during the same periods. In terms of ERP determination, there are still differences between the results from global network station observational data of VGOS and traditional S/X VLBI. Specifically, the ERP polar motion component accuracy derived from VGOS is inferior to that of traditional S/X VLBI, while the UT1-UTC accuracy is comparable to that of traditional S/X VLBI measurements. Further analysis using experimental stations centered on co-located stations indicates that VGOS measurements can provide ERP determination results with higher accuracy.
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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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