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Mathematics
Volume 8
Issue 6
10.3390/math8060939
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Article

Evaluation of VLBI Observations with Sensitivity and Robustness Analyses

by
Pakize Küreç Nehbit
1,2,*,
Robert Heinkelmann
2,
Harald Schuh
2,3,
Susanne Glaser
2,
Susanne Lunz
2,
Nicat Mammadaliyev
2,3,
Kyriakos Balidakis
2,
Haluk Konak
1 and
Emine Tanır Kayıkçı
4
1
Department of Geomatics Engineering, Kocaeli University, Kocaeli 41001, Turkey
2
GFZ German Research Centre for Geosciences, 14473 Potsdam, Germany
3
Chair of Satellite Geodesy, Technische Universität Berlin, 10623 Berlin, Germany
4
Department of Geomatics Engineering, Karadeniz Technical University, Trabzon 61080, Turkey
*
Author to whom correspondence should be addressed.
Mathematics 2020, 8(6), 939; https://doi.org/10.3390/math8060939
Received: 27 April 2020 / Revised: 2 June 2020 / Accepted: 3 June 2020 / Published: 8 June 2020
(This article belongs to the Special Issue Stochastic Models for Geodesy and Geoinformation Science)
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Abstract

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. View Full-Text
Keywords: very long baseline interferometry; sensitivity; internal reliability; robustness; CONT14 very long baseline interferometry; sensitivity; internal reliability; robustness; CONT14
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MDPI and ACS Style

Küreç Nehbit, P.; Heinkelmann, R.; Schuh, H.; Glaser, S.; Lunz, S.; Mammadaliyev, N.; Balidakis, K.; Konak, H.; Tanır Kayıkçı, E. Evaluation of VLBI Observations with Sensitivity and Robustness Analyses. Mathematics 2020, 8, 939. https://doi.org/10.3390/math8060939

AMA Style

Küreç Nehbit P, Heinkelmann R, Schuh H, Glaser S, Lunz S, Mammadaliyev N, Balidakis K, Konak H, Tanır Kayıkçı E. Evaluation of VLBI Observations with Sensitivity and Robustness Analyses. Mathematics. 2020; 8(6):939. https://doi.org/10.3390/math8060939

Chicago/Turabian Style

Küreç Nehbit, Pakize, Robert Heinkelmann, Harald Schuh, Susanne Glaser, Susanne Lunz, Nicat Mammadaliyev, Kyriakos Balidakis, Haluk Konak, and Emine Tanır Kayıkçı. 2020. "Evaluation of VLBI Observations with Sensitivity and Robustness Analyses" Mathematics 8, no. 6: 939. https://doi.org/10.3390/math8060939

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