GNSS-вимірювання

The aim of the work is to analyze the change of hydrostatic and wet component values of zenith tropospheric delay (ZTD), determined for all seasons of the year. For today, ZTD components are determined mainly as follows: hydrostatic component – by using one of existing analytical models, mostly Saastamoinen model, and wet component – from GNSS measurements using simulated value of hydrostatic component. Also, in this study we evaluated the accuracy of the obtained values of hydrostatic and wet ZTD components for similar components, determined by radio sounding.

The goal. Identify the relationship between seasonal temperature changes and vertical and horizontal displacements of GNSS control points based on data obtained by the automated monitoring system of the Dnipro HPP dam in the period from 2016 to 2020. Input data. The research used data of uninterrupted GNSS measurements obtained at 16 points of the Dnipro HPP dam from mid-2016 to mid-2020. Method.

The aim of this work is the research of the magnitude of the components change of the zenith tropospheric delay for the territory of Ukraine according to several-day terrestrial meteorological measurements, as well as the construction and study of the field of their change.  Method. The accuracy of the determination of the tropospheric delay and its components depends on the amount of meteorological data that can be used for its caclulation.

The purpose of the given work lies in the studies of the atmospheric precipitable water vapour (PWV), based on the processing of aerological and GNSS (Global Navigation Satellite System) measurements, as well as the comparing of PWV values, determined according to the data of aerological and GNSS stations, located both in temperate and tropical latitudes.

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 results of long-term studies of landslide processes in the areas of operation of pumped storage power plant with the help of modern GNSS technologies are considered. The presence of deformation of the earth's surface, both in terms in plane and vertical, is revealed. Displacement of some points is a closed-return trajectory and not exceed a few millimeters. Another part of the points is characterized by the horizontal displacements with the presence of returning movements.

The paper illuminates the following questions according to the determination tropospheric delay: by the data of atmosphere radio sounding, by the data of the basic surface meteorological parameters only and by the data derived from  GNSS observations. Comparison of the results and estimation of accuracy have been carried out.

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.