Abstract
Antenna changes at GNSS reference stations frequently produce discontinuities in the coordinate time series. These apparent position shifts are mainly caused by changes of carrier-phase multipath effects and different errors in the antenna phase center corrections. A monitoring method was developed and successfully tested, which requires additional GNSS observations from a local, temporary reference station. Changes of carrier-phase measurement errors due to the antenna change are determined and stored in L1 and L2 phase maps. These phase maps provide corrections to be applied either to the observation data obtained before the antenna change or to the observation data obtained after the antenna change. The observation corrections are able to remove coordinate discontinuities independent of the selected coordinate estimation algorithm.
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Acknowledgments
The observation data sets used in this study were collected by various institutions often as contributions to the IGS, the EPN, or the Satellite Positioning Service of the German State Survey (SAPOS). Most of the data sets were copied from the servers of Bundesamt für Kartographie und Geodäsie (BKG), Frankfurt, Germany. Parts of this research work were funded by the German Federal Ministry of Education and Research (BMBF) under contract 03KIS055.
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Wanninger, L. Correction of apparent position shifts caused by GNSS antenna changes. GPS Solut 13, 133–139 (2009). https://doi.org/10.1007/s10291-008-0106-z
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DOI: https://doi.org/10.1007/s10291-008-0106-z