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Outline
To investigate the impact of receiver IFCB on GLONASS undifferenced precise time transfer, different IFCB modeling schemes were proposed and their PPP time transfer performance was evaluated, namely the IFCB0 scheme ignoring IFCB, the IFCB1 scheme modeling IFCB as a linear function of frequency numbers, and the IFCB2 scheme modeling IFCB as a quadratic polynomial. The results indicate that IFCB modeling is of great significance for improving the accuracy of PPP time transfer. Compared to the IFCB0 scheme, the IFCB modeling approach demonstrates the most notable improvement in long-term frequency stability for time transfer. The IFCB modeling significantly enhances time transfer stability for hybrid and heterogeneous receiver/antenna types, while its improvement for homogeneous equipment is limited. Additionally, compatibility tests with different satellite precision products show that the IFCB2 scheme aligns best with the precision products from the European Orbit Determination Centre, whereas the IFCB1 scheme is more compatible with the precision products provided by Wuhan University.
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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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