O Uso do GNSS na determinação de pequenos deslocamentos estruturais

Abstract

Among the various methods used in geodetic monitoring of structures, there is GNSS technology, still little explored and active in this market. The technology in question offers several models of equipment that, in turn, can be used in different ways. With the intention of evaluating the precision and accuracy of two distinct GNSS receptors that use the satellite constellations of GPS and GLONASS, which were GR-3 (Topcon) and R4 (Trimble), positioning were performed to enable this evaluation to use them in determining small structural displacements. For this, a device was made to simulate a structural displacement, and it was graduated in pre-established positions and fixed on the forced centering base located in IFG, Campus Goiânia. The positioning were made, for each receiver, on two different days, in the morning and evening shifts, aiming at the evaluation in the different periods proposed. The data from these surveys were processed and evaluated according to the resulting coordinates and standard deviations, as well as their planimetric and altimetric precisions. From these values, a higher effectiveness of R4 was noticed. The equipments can be used in monitoring that uses the same or lower accuracy achieved by the receivers. It is suggested the continuity of the study in question.