Compatibility of GNSS solutions using differential correction via radio and NTRIP in an urban network in Costa Rica

Abstract

The results obtained from the evaluation of the compatibility of the solutions of cartographic coordinates and ellipsoid height determined through the application of GNSS (Global Navigation Satellite Systems) survey methodologies in the differential correction modalities RTK (Real Time Kinematic) via radio and via internet via NTRIP (Networked Transport of RTCM via Internet Protocol) are presented. The demand for the latter has been growing since the service was launched at the beginning of the year 2023. The survey methodology with correction via NTRIP involves making observations in a few seconds, while the use of radio requires more measurement time. Both offer adequate solutions within the tolerance parameters established by national legislation. Six data sets with horizontal and vertical coordinate differences were determined by taking standard static solutions. The R language was used as a tool for generating the results. These reflected a consistency between the RTK survey via radius of approximately 1.3 cm horizontally and -7 cm vertically. The results presented offer a first quantification between both solutions, however, users should be aware that both methodologies have a high dependence on the coordinates and reference epoch of the base stations. In this study we want to offer a first discrepancy parameter in the use of NTRIP for topographic surveys.