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Accuracy estimation of site coordinates derived from gnss-observations by non-classical error theory of measurements

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Geodesy and Geodynamics 2021年第5期12卷 347-355页

作者： Petro Dvulit Stepan Savchuk Iryna Sosonka Department of Higher Geodesy and Astronomy Lviv Polytechnic National UniversityLvivUkraine Institute of Navigation Military University of AviationDeblinPoland

The velocities of tectonic plates derived from gnss time series are regularly used as input data for geophysical models. However, as shown by numerous researches, the coordinates time series contain residual errors of a systematic nature, which can significantly affect the reliability of the obtained velocity estimates. This research shows that using non-classical error theory of measurement(NETM)for processing gnss time series allows detecting the presence of weak, not removed from gnss processing, sources of systematic errors. Based on the coordinate time series of selected permanent gnss stations in Europe, we checked the empirical distributions of errors by the NETM on G. Jeffries’ recommendations and on the principles of the theory of hypothesis tests according to Pearson’s criterion. It is established that the obtained coordinates time series of gnss-stations only partially confirm the hypothesis of their conformity to the normal Gaussian distribution law, and this may be the main reason for their unrepresentative classification. In the future, it is necessary to identify and take into account the causes of residual errors that distort the real distribution of the results of the gnss time series.

关键词： gnss data Processing gnss time series Discontinuities in time series Non-classical error theory of measurements Noise analysis

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Analysis of seasonal position variation for selected gnss sites in Poland using loading modelling and GRACE data

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Geodesy and Geodynamics 2017年第4期8卷 253-259页

作者： Marcin Rajner Tomasz Liwosz Warsaw University of Technology Department of Geodesy and Geodetic Astronomy

In this study we compared weekly gnss position time series with modelled values of crustal deformations on the basis of Gravity Recovery and Climate Experiment(GRACE) *** Global Navigation Satellite Systems(gnss) time series were taken from homogeneously reprocessed global network solutions within the International gnss Service(IGS) Reprocessing 1 project and from regional solutions performed by Warsaw University of Technology(WUT) European Permanent Network(EPN) Local Analysis Center(LAC) within the EPN reprocessing *** gnss sites from the territory of Poland with observation timespans between 2.5 and 13 years were selected for this *** Total Water Equivalent(TWE) estimation from GRACE data was used to compute deformations using the Green's function *** frequency components were removed from GRACE data to avoid aliasing *** GRACE observes mainly the mass transport in continental storage of water,we also compared GRACE deformations and the gnss position time series,with the deformations computed on the basis of a hydrosphere *** used the output of Water GAP Hydrology Model(WGHM) to compute deformations in the same manner as for the GRACE *** WGHM gave slightly larger amplitudes than gnss and *** atmospheric non-tidal loading effect was removed from gnss position time series before comparing them with modelled *** results confirmed that the major part of observed seasonal variations for gnss vertical components can be attributed to the hydrosphere *** results for these components agree very well both in the amplitude and *** decrease in standard deviation of the residual gnss position time series for vertical components corrected for the hydrosphere loading reached maximally 36%and occurred for all but one stations for both global and regional *** horizontal components the amplitudes are about three times smaller than for vertical components therefore the comparison is muc

关键词： Mass transport Loading GRACE Hydrology model gnss time series

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