Evaluation of VLBI Observations with Sensitivity and Robustness Analyses

Mathematics

EmineTanır Kayıkçı¹  PakizeKüreç Nehbit²  Haluk Konak²  Harald Schuh³  Kyriakos Balidakis³  Nicat Mammadaliyev³  Susanne Glaser³  Susanne Lunz³  Robert Heinkelmann³ 

[1] Department of Geomatics Engineering, Karadeniz Technical University, Trabzon 61080, Turkey;Department of Geomatics Engineering, Kocaeli University, Kocaeli 41001, Turkey;GFZ German Research Centre for Geosciences, 14473 Potsdam, Germany;

关键词: very long baseline interferometry;    sensitivity;    internal reliability;    robustness;    CONT14;   

DOI  :  10.3390/math8060939

来源: DOAJ

【 摘 要 】

Very Long Baseline Interferometry (VLBI) plays an indispensable role in the realization of global terrestrial and celestial reference frames and in the determination of the full set of the Earth Orientation Parameters (EOP). The main goal of this research is to assess the quality of the VLBI observations based on the sensitivity and robustness criteria. Sensitivity is defined as the minimum displacement value that can be detected in coordinate unknowns. Robustness describes the deformation strength induced by the maximum undetectable errors with the internal reliability analysis. The location of a VLBI station and the total weights of the observations at the station are most important for the sensitivity analysis. Furthermore, the total observation number of a radio source and the quality of the observations are important for the sensitivity levels of the radio sources. According to the robustness analysis of station coordinates, the worst robustness values are caused by atmospheric delay effects with high temporal and spatial variability. During CONT14, it is determined that FORTLEZA, WESTFORD, and TSUKUB32 have robustness values changing between 0.8 and 1.3 mm, which are significantly worse in comparison to the other stations. The radio sources 0506-612, NRAO150, and 3C345 have worse sensitivity levels compared to other radio sources. It can be concluded that the sensitivity and robustness analysis are reliable measures to obtain high accuracy VLBI solutions.

【 授权许可】

Unknown