This work tested several procedures to determine the linear measuring device's systematic influences and measurement uncertainty. Three methods were developed that differ in the degree and density of sampling during measurement and were compared with the existing method used for calibrating linear measuring devices in the Metrology Laboratory accre...

By Miljana Todorović Drakul, Sanja Grekulović, Dušan Petković, Oleg Odalović

This study compares the NeQuick and IRI ionospheric models using data from ionosondes as reference. Validation based on data obtained by direct measurement using ionosondes helps to refine empirical models and improves their reliability. In this way, it is possible to identify the differences and limitations of the model and contribute to its impro...

By Slavica Ilijević, Sanja Grekulović, Miljana Todorović Drakul

In this paper, a comparative study of the total vertical electron content (VTEC) calculated using the IRI-2016 and NeQuick2 models were performed. The research was done for the days of maximum solar activity in 2019, with data from seven IGS GNNS stations in the region of the Balkan Peninsula. The results show that both models agree quite well with...

By Miljana Todorović Drakul, Sanja Grekulović, Oleg Odalović, Dušan Petković

Within this paper, we evaluated the quality of three Global Geopotential Models entitled: EGM96,EGM2008, and GOCO05c. The models were evaluated by using 1001 terrestrial discrete values ofheight anomalies determined by Global Navigation Satellite Systems and normal heights, which weconsidered to be true values within this research. In addition to t...

By Oleg Odalović, Danilo Joksimović, Dušan Petković, Marko Stanković, Sanja Grekulović