Pishko Y. Parameter update of the relative satellite observation methodology used for the еstablishment of geodetic control networks

The thesis deals with a set of topical questions, the solution of which makes possible the modernization of the methodology for the establishment of geodetic networks using GNSS. The relationship between the accuracy of determination of vector lengths and the change in duration of the observation and distance between GNSS receivers has been researched. Based on the research results, we have derived formulas for estimating the accuracy of vector lengths determined by dual-system (GPS/GLONASS) dual- and single-frequency receivers. Formulas have been derived based on the results of the study of the dependence of accuracy of point position determination on the duration of the satellite observations using dual GPS/GLONASS dual-frequency receivers. Lengths of vectors as well as the number of vectors, the parameters of which are used determine the position of the point also contribute to the accuracy of point position determination. The effectiveness of the simultaneous use of the signal of two satellite systems (GPS and GLONASS) and its effect on the accuracy of point position determination with change in the duration of observations sessions has been analyzed. The optimal values of elevation mask have been determined, whose setting is recommended during varying lengths of observation using single- and dual-frequency receivers, which accept the signals of only the GPS system and receivers accepting both systems (GPS and GLONASS). The effect of different types of ephemeris on the accuracy of point positioning in networks with different ranges of baseline lengths has been determined and their choice with the use of satellite signals from GPS only and GPS with GLONASS has been substantiated. Therefore, obtaining actual parameters of relative static observation techniques will allow the use of advanced GNSS capabilities and optimize the creation of geodetic networks.