GNSS-measurement

The purpose of the study is to attempt to determine the deviation of vertical lines using trigonometric levelling and Global Navigation Satellite System (GNNS) measurements. For the last decades with the emergence of high-precision electronic theodolites and tacheometers, trigonometric levelling becomes a competitor of the geometric levelling of the II and III accuracy classes. This is primarily the definition of exceedances at distances up to 1–2 km for topographic surveying and the study of geodynamic processes in zones of the man-made load.

The purpose of this work lies in comparing and defining the differences between the measured values of the total electron content (TEC) and the corresponding TEC values, obtained according to global ionospheric map (GIM) data in different periods of solar activity. Methodology. The TEC and the data of global ionospheric maps (GIM) for the SULP station were used in the work, as well as the data from the Ionolab website for better clarity, where the nodal values of the TEC are essentially used, from the same global ionospheric maps (GIM).

The purpose of this paper is to develop an algorithm of regular averaging time series VTEC to investigate the daily course of ionospheric parameters with the use of empirical methods of analysis. Methodology. In order to improve the preparation of data which was used for the construction regional model of the ionosphere, we carry out the averaging parameter VTEC at 17 stations on the ZAKPOS network. We define the value of the parameter VTEC using the algorithm created by authors for 25 days in 2013. Results.