Full
MA Juanjuan, engineer, majors in geodetic instrument measurement, gravity measurement and metrology, E-mail: juan654321@126.com
Outline
The linear or nonlin drift of the spring gravimeter must be addressed for the existing observation system based on spring gravimeters to monitor the long-term change signal of gravity. Simple linear fitting is usually difficult to simulate the real drift of the instrument over a long period of time, and too high-order fitting will also remove the trend change signal of the signal. This study introduces linear and nonlinear drift correction models to more reasonably remove the drift. This study uses the data of the gPhone gravimeter at Zigui station in 2017 and the gPhone gravimeter at Wushi station in 2023 for analysis and verification. First, the correlation between each channel of Zigui station and the original gravity channel is analyzed, and the theoretical gravity effect of the Three Gorges water storage on the Zigui station is calculated with the results that reach more than 100 μGal. Then, the model coefficients are obtained using a variety of regression analysis methods, and the residual results are studied after deducting various correction values and drift terms. The research results show that the changes in the internal pressure and temperature of the instrument are the main causes of gravity data drift. In the regression model used in this paper, the nonlinear regression model(pure quadratic regression) drift removal results can better reflect the gravity changes caused by water storage, and the residual effect obtained after smoothing is closer to theory than the conventional polynomial fitting method for drift removal. Similar conclusions were obtained by verifying the data from Wushi station.
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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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