Impact of the Compatibility of Velocities Reference Frame in the Process of Updating Coordinates using PPP
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Abstract
In Precise Point Positioning (PPP), the coordinates estimated at the epoch of the survey are referenced to the materialization of the global reference system used in the orbits of the satellites, currently IGb14 (epoch of observation). However, regional geodetic systems are officialized and adopted in different countries, such as in Brazil, which adopts SIRGAS2000 (epoch 2000.4). One way of dealing with these differences is to use the Helmert transformation in conjunction with a velocity model (which also has a reference system) to make both the reference and the epoch compatible. This work aims to evaluate the performance of the VEMOS2009 and VEMOS2017 models in the application of the coordinate update procedure for high precision GNSS positioning, considering or not the compatibility of the reference velocities obtained. It was used GNSS data in the RINEX format from 175 RBMC stations processed with the IBGE-PPP online service. In view of the results found, it was possible to verify that the compatibility of the velocities reference proved to be effective for the process of updating the coordinates obtained in the IBGE-PPP. Of the 1513 coordinates obtained with each of the four velocities, VEMOS2009-CCR presented 62.92% of the smallest discrepancies, followed by VEMOS2017-CCR with 29.54%, VEMOS2009-SCR with 7.21% and VEMOS2017-SCR with 0, 33%. Regarding the decrease in discrepancies after the compatibility of the velocities reference, it was found that, for VEMOS2009, 85.86% of the coordinates presented a smaller discrepancy after the update. For VEMOS2017, this decrease occurred in 98.61% of the coordinates.
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