Análise dos resultados de processamentos de dados GNSS aplicado ao monitoramento de estruturas, utilizando efemérides transmitidas, precisas e o posicionamento por ponto preciso do IBGE

In order to comply with the dam safety regulations and the current legislation, this work is aimed at monitoring the Maua HPP dam in the Tibagi River in the most precise method possible. Specifically, the monitoring method exhibited in this study uses GNSS technology and static relative positioning method. To obtain coordinates and their respective standard deviations of the geodetic monitoring network points, raw data was processed using short and long baselines, broadcast ephemeris, precise ephemeris and precise point positioning (PPP). The result of the broadcast ephemeris was satisfactory, allowing for processing the day after the data collection campaign. The use of precise ephemeris corresponded expectation when the short baseline was used. However, the disadvantage is in the time lag for processing of at least 14 days after the campaign. PPP and the long baseline resulted in standard deviations higher than those obtained with broadcast ephemeris, precise ephemeris and short baseline. Therefore, PPP and long baseline were considered as inadvisable for use in monitoring structures.