Experimental study of the field methodology for assessing the accuracy of GNSS measurements

Abstract

The authors propose a field control of GNSS equipment precision characteristics methodology for recording sub-centimeter movements of the Earth`s surface at geodynamic observations of tectonically moderate areas activity. The factors influencing the accuracy of GNSS measurements are analyzed. The theoretical aspects of developing measuring equipment field control methods are presented. Testing of the devices was carried out in the course of surveys on the Nizhne-Kanskiy massif geodynamic range in Krasnoyarsk krai in 2020–2022. The experiment was made with two-system GNSS facilities of geodesic class (5 to 6 sets). The results show that the proposed methodology of the used tools accuracy characteristics field control enables detecting incorrect nominal parameters of measuring instruments. In this case the parameters of the receivers` antennas are well coordinated with each other. The exactness of control characteristics in plan is at the level of 1,3–2,5 mm, in height – 2,5 mm. It was revealed that the height of the actual phase center of Grant_G3T and MarAnt+ antennas differ from the manufacturer`s declared passport data