期刊
ALL EARTH
卷 34, 期 1, 页码 107-119出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/27669645.2022.2098611
关键词
GNSS; common mode error; Correlation-weighted spatial filtering
资金
- National Natural Science Foundation of China [42074006]
- State Key Laboratory of Geo-Information Engineering of the Ministry of Natural Resources (MNR), CASM [2021-0005]
- Key Laboratory of Surveying and Mapping Science and Geospatial Information Technology of the Ministry of Natural Resources (MNR), CASM [2021-0005]
- National Key Research and Development Program of China [2017YFA0603104]
- State Key Program of the National Natural Science Foundation of China [41531069]
This study explores the performance of different spatiotemporal filtering methods in reducing common mode error (CME) in GNSS networks at different spatial scales and concludes that correlation-weighted spatial filtering (CWSF) is the most effective method.
Spatiotemporal filtering can effectively remove the common mode error (CME) which significantly affects the accuracy of the Global Navigation Satellite System (GNSS) coordinate time series. This contribution explores the performance of different spatiotemporal filtering methods applied to GNSS networks at different spatial scales. We selected small-scale (<500 km) and large-scale (>2000 km) GNSS networks from the Crustal Movement Observation Network of China (CMONOC) for the focus of the study. To remove or mitigate CME from the different-scale GNSS networks, principal component analysis (PCA), independent component analysis (ICA) and correlation-weighted spatial filtering (CWSF) are compared. In addition, we investigate the correlations between each of the GNSS station residual time series to examine the effectiveness of the novel CME filter. When compared with PCA and ICA results, we find that CWSF is less intrusive on the data and is more effective in reducing the CME in the different-scale GNSS networks, and thus the preferred the filtering methodology. We conclude that this study could provide an important reference to remove CME from GNSS coordinate time series.
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