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Methodology for local correction of the heights of global geoid models to improve the accuracy of GNSS leveling

Geodesy and Geodynamics 2024年第1期15卷 42-49页

作者： stepan savchuk Alina Fedorchuk Institute of Navigation Military University of AviationDeblinPoland Department of Higher Geodesy and Astronomy Lviv Polytechnic National UniversityLvivUkraine

At present,one of the methods used to determine the height of points on the Earth’s surface is Global Navigation Satellite System(GNSS)*** is possible to determine the orthometric or normal height by this method only if there is a geoid or quasi-geoid height model *** paper proposes the methodology for local correction of the heights of high-order global geoid models such as EGM08,EIGEN-6C4,GECO,and XGM2019e_*** methodology was tested in different areas of the research field,covering various relief *** dependence of the change in corrected height accuracy on the input data was analyzed,and the correction was also conducted for model heights in three tidal systems:"tide free","mean tide",and"zero tide".The results show that the heights of EIGEN-6C4 model can be corrected with an accuracy of up to 1 cm for flat and foothill terrains with the dimensionality of 1°×1°,2°×2°,and 3°×3°.The EGM08 model presents an almost identical *** EIGEN-6C4 model is best suited for mountainous relief and provides an accuracy of 1.5 cm on the 1°×1°*** height correction accuracy of GECO and XGM2019e_2159 models is slightly poor,which has fuzziness in terms of numerical fluctuation.

关键词： GNSS leveling Global geoid model Gravity anomaly Weight data Correcting data

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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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维普期刊数据库

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

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Geodesy and Geodynamics 2021年第5期

作者： Petro Dvulit stepan savchuk Iryna Sosonka

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