Estudo comparativo de métodos e serviços públicos de posicionamento por GNSS

Abstract

The field of Topography and Geodesy is constantly evolving with the development of techniques and instruments that simplify the work of professionals and improve the results of measurements. Over the last decade, IBGE's NTRIP service has become popular as a complement to the RTK technique, a GNSS positioning technique based on reception of raw data in the RTCM protocol, which the device uses to calculate corrections of geographic coordinates in real time. This paper aims to compare the results of this technique with other methods that require post-processing of data, such as the static relative method and the absolute method using the PPP-IBGE service. In a second stage, a planialtimetric survey was executed by polygonation in order to compare the results with the celestial geodesy (GNSS). The results demonstrate the reliability of the coordinates obtained with NTIP within a certain margin of error. A disadvantage is their dependence on the Internet at the time of surveys, especially in rural areas, which can make surveys unfeasible due to the absence of a mobile phone signal