Full
MA Zhuoxi, PhD, engineer, majors in spatial geodetic data processing, E-mail: mzhx_1991@163.com
Outline
This paper introduces the data preprocessing and interpolation methods for universal time(UT1) and analyzes the factors affecting the interpolation accuracy of UT1, including different interpolation methods and differences in data preprocessing. The study combines international products with domestic co-observation data to analyze the interpolation accuracy of UT1 under different observation frequencies of very long baseline interferometry(VLBI). The results show that among different interpolation methods, cubic spline interpolation is superior. The interpolation process of UT1 must consider the influence of Earth's solid tides, while high-frequency corrections can be neglected. Compared with daily observations, when the observation interval is less than 2 days, the deviation of UT1 can be stabilized at around 0.05 ms. Increasing the observation interval further will lead to a more pronounced increase of UT1 deviation. Verification using domestic observational data shows that with an observation interval of 2 days, the accuracy of UT1 can reach around 0.05 ms.
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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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