Automation in the Change of Geodetic Reference Process and Coordinate Reduction in High Precision Positioning
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Abstract
The positioning in topographic and geodetic surveying with GNSS (Global Navigation Satellite System) receivers could be performed using commercial and free on-line service available on the internet. These determine the coordinates of the point of interest at epoch and geodetic reference frame of precise orbits, which in the post-processing GNSS data collected, are used and differ from the reference frame adopted for the Brazilian Geodetic System (SGB). In Brazil, only the frame SIRGAS2000 (epoch 2000.4) is applied to the coordinate determination. Therefore, it is necessary to change the reference frame and reduction of coordinate obtained from those services to the official geodetic frame adopted in the country. Thus, the computational tools to automation of procedures and report supply of the calculations, performed internally, contributes to students and users of the on-line service for post-processing GNSS data for positioning. The purpose of this study was to develop a software, named of MRefGeo, to make the change of geodetic reference frame and coordinate reduction as well as to validate the results of its use. In the MRefGeo, it is possible to choose the parameter available between the IBGE-PPP (Brazilian Institute of Geography and Statistics – Precise Point Positioning) or IERS/IGN (International Earth rotation and Reference systems Service/ Institut National de l'Information Géographique et Forestière) to change the referential and velocity models for the SIRGAS – VEMOS2009 and VEMOS2017. The experiments realized with use of MRefGeo showed that results are in agreement, at the millimeter level, with those provide by the ETRF/ITRF coordinate transformation on-line tool used in these operations.
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