ANÁLISE COMPARATIVA DE DESEMPENHO ENTRE O LEVANTAMENTO GNSS EM PÓS-PROCESSAMENTO (L1 E L1/L2) E O SERVIÇO DE CORREÇÃO POR SATÉLITE (RTX): um estudo de caso em área controlada

Abstract

The evolution of geotechnologies has consolidated GNSS as an essential tool for high-precision georeferenced surveys. The objective of this study was to compare the technical and operational performance of three GNSS methodologies: L1 single-frequency post-processing, L1/L2 dual-frequency post-processing, and the RTX real-time correction service, in a controlled area with five reference benchmarks. The methodology involved field surveys using all three systems, data processing in TOPCON Tools software, and comparative analysis of quality parameters, precision, accuracy, and operational efficiency. The results demonstrated that RTX showed the best operational performance, with reduced average tracking time, a higher average number of tracked satellites, and horizontal precision between 0.018 m and 0.036 m at the evaluated vertices. The L1/L2 solution achieved millimeter-level precision under favorable conditions but presented limitations under vegetation cover. The L1 solution showed greater variability, with horizontal precision of up to 2.154 m at vertex M1, indicating higher sensitivity to local tracking conditions. It is concluded that, under the conditions evaluated in this case study, RTX technology showed better operational performance and results compatible with georeferencing applications, provided that the limitations imposed by vegetation cover, signal obstructions, and the need for validation of critical points are observed.