Full
LONG Haili, postgraduate, majors in high precision GNSS positioning, high frequency GNSS seismology, E-mail: 202282020075@sdust.edu.cn
Outline
To mitigate the unmodeled multipath errors in traditional dynamic precise point positioning(PPP) and enhance the accuracy of high-rate GNSS real-time coseismic displacement measurements, this paper constructed an undifferenced and uncombined PPP multipath error correction model based on the multipath hemispherical map(MHM). This method employs undifferenced and uncombined PPP to resolve the residuals of pseudorange and phase. It then constructs a refined MHM model using multi-day residual sequences, which is subsequently applied to dynamic PPP real-time positioning on the target day. Using the example of the MW8.2 earthquake that occurred south of Alaska in 2021, we analyzed the real-time coseismic displacement results before and after model correction. The average RMS reduction rates in the E, N, U directions were 52.9%, 55.0%, and 50.7%, respectively, leading to an overall improvement of 51.7%. Comparing the real-time coseismic displacement extracted by the method in this paper with that extracted by the strong seismometer after baseline correction, the former more accurately reflects the displacement changes during the earthquake, indicating the stability and reliability of the proposed model.
19
6
| 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 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62662699(Operation and Technical Support)
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
