Full
Outline
To realize the refined modeling and real-time monitoring of the ionosphere in mid-low latitude regions and meet the engineering demand for high-precision correction of regional ionospheric delay, an ionospheric grid model (GZIM) with a temporal resolution of 1 hour by utilizing BDS/GNSS observation data from 75 continuous operating reference stations (CORS) in Guizhou. The ionospheric delay is extracted using the un-difference and un-combined algorithm, and a regional vertical total electron content (VTEC) model is constructed with the 4th-order spherical harmonic function. After eliminating data disturbed by geomagnetic storms, the spatiotemporal distribution characteristics of GZIM are compared with the global ionospheric model products released by IGS and CODE, and the model performance is verified through dynamic single-frequency precise point positioning (PPP). The experimental results show that GZIM is generally consistent with global ionospheric grid products in terms of temporal variation characteristics, and can depict the ionospheric TEC gradient at small scales more elaborately. In the dynamic single-frequency PPP experiments on geomagnetically quiet days, GZIM achieves higher ionospheric delay correction accuracy than global ionospheric products, with the root mean square (RMS) values of positioning errors being 8.5 cm in the east direction, 10.0 cm in the north direction, and 24.2 cm in the up direction, respectively. Specifically, the up-direction positioning accuracy is improved by 50.0% and 54.1% compared with IGSG and CODG global products, respectively.
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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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