Full
WANG Xianzhong, senior engineer, majors in GNSS positioning algorithm, GNSS/INS combined positioning algorithm and product development, E-mail: xianzhongwang@unicorecomm.com
Outline
We propose an adaptive carrier phase smoothing pseudorange method based on multi frequency observations, which allows for adaptive selection of effective carriers to continue smoothing the pseudorange of all frequencies in the case of partial frequency signal loss of lock or cycle slip. The results show that the adaptive smoothing L1/L2/L5 pseudorange noise of GPS is reduced by about 62%, 50%, and 33% respectively compared to traditional single frequency smoothing, and is reduced by about 60%, 54%, and 61% respectively compared to traditional dual frequency smoothing. In addition, the B1I/B2I/B3I pseudorange noise of BDS-2 is reduced by about 64%, 67%, 51% respectively compared to traditional single frequency smoothing, and is reduced by about 55%, 59%, 50% respectively compared to traditional dual frequency smoothing. Similar effects are also observed in other GNSS frequencies. Conducting dynamic positioning experiments on road overshadowed by trees and tall buildings, the results indicate that standard deviation(STD) of adaptive smoothing pseudorange positioning is reduced by about 45%, 76%, 47% in E, N, U directions respectively compared to single frequency smoothing and about 41%, 69%, 49% compared to dual frequency smoothing. Adaptive smoothing method can improve position accuracy effectively.
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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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