Precision and accuracy of the static GNSS system for surveying networks used in Civil Engineering

Abstract

We implemented a field check for calibrating surveying equipment. It was geo-referenced with a Total Station Theodolite and by implementing procedures concerning repeatability and reproducibility. We carried out GNSS (Global Navigation Satellite System) static positioning with double frequency equipment, sensitizing occupation times, day times, uncorrected coordinates subjected to a differential correction procedure and type of coordinates obtained. This facilitated an evaluation of precision and accuracy for the GNSS system with the static method, which gave a global RMS (root mean square) error of 1 cm for conditions with no multi-path effect and 4cm for field calibration points close to buildings. Additionally, we found optimal results for occupation times of 30 minutes, and the need to use planar Cartesian coordinates to ensure compatibility with the surveys using electronic measurement of distances, which allows for the use of the static GNSS system in precise surveys for different applications in Civil Engineering.