ESTIMATION OF THE DEFLECTION OF VERTICAL COMPONENTS USING PRECISE LEVELLING AND GNSS MEASUREMENTS ON HIGH PRECISION LEVELLING NETWORK OF SERBIA

Abstract

This paper presents the combined method of determining the deflection of vertical components ? and ? based on the precise levelling and GNSS measurements. In general, there are several methods, but the combined method simplifies data collecting and subsequent processing of results in comparison with other methods. Components determination was performed on the high precision levelling network in Serbia, by calculating undulation on each point, so as azimuth and length for each side of the network starting from reference point. The length of sides is in the range of 20 km to 300 km. A point approximately located in the middle of the network was chosen as a reference point. By applying least-squares method, the estimated values of the components were obtained. In addition to the statistical evaluation of the deflection of vertical components, the paper shows a comparison of the obtained values with the values from the global Geopotential models, which justifies using the combined method for networks of similar design.