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Zero drift and solid earth tide extracted from relative gravimetric data with principal component analysis

Geodesy and Geodynamics 2015年第2期6卷 143-150页

作者： Yu Hongjuan Guo Jinyun Li Jiulong Mu Dapeng Kong Qiaoli College of Geodesy and Geomatics Shandong University of Science and Technology State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and Ministry of Science & Technology Shandong University of Science and Technology Institute of Geodesy and Geophysics Chinese Academy of Science

Zero drift and solid earth tide corrections to static relative gravirnetric data cannot be ignored. In this paper, a new principal component analysis （PCA） algorithm is presented to extract the zero drift and the solid earth tide, as signals, from static relative gravimetric data assuming that the components contained in the relative gravimetric data are uncorrelated. Static relative gravity observations from Aug. 15 to Aug. 23, 2014 are used as statistical variables to separate the signal and noise with PCA to obtain desired signals. The results of the linear drift extracted by PCA are consistent with those calculated by the least squares linear fitting, and the differences only reach to 10-2μGal/day order of magnitude. Furthermore, PCA is used to estimate the solid earth tide from the relative gravimetric data corrected by the zero drift. The statistical results are consistent with the results derived from the solid earth tide correction provided by the internal software of the CG-5 gravimeter （SCINTREX Limited Ontario Canada）. The statistical results of the differences between the two methods are both less than 8 ,Gal, and the RMSs for 9 days are all less than 5 μGal.

关键词： Principal component analysis Zero drift solid earth tide Relative gravimetry CG-5 gravimeter

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Analysis of The Tidal Effect on GNSS Kinematic and Static Positioning

Analysis of The Tidal Effect on GNSS Kinematic and Static Po...

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第三届中国卫星导航学术年会

作者： Xiaohui Liu,Qianxin Wang,Yamin Dang,Xiaoguo Yang Chinese Academy of Surveying and Mapping,Beijing 100830

The tidal effect is a main error source in GNSS *** is analyzed in detail by tide computation and practical data processing in this *** results show that the effect of the tide on static and kinematic positioning is related to the observation time,the station location and the length of baseline,*** tidal effect on coastal stations is greater than that on inland *** difference of the tidal effect is great even for nearby coastal ***,the effect shows zonal distribution for inland ***,it has to be taken into account even for a relative small coastal GNSS *** GNSS data kinematic processing experiment and airborne kinematic GNSS data processing experiment are done in this paper,and the results show that the tidal effect can be detected by GNSS surveying.

关键词： solid earth tide ocean tide static differential positioning kinematic differential positioning

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