Abstract
We investigate the possibilities to use data from water vapor radiometers (WVR) to calibrate the wet tropospheric delays in geodetic Very Long Baseline Interferometry (VLBI) observations. We test three methods: (1) direct calibration using WVR measurements aquired in the directions of the VLBI observations, (2) estimating zenith wet delays and gradients from the WVR data and use these to correct the VLBI data, and (3) including the WVR measurements as additional observations in the VLBI data analysis. Furthermore, in all cases we model the WVR calibration errors in the data analysis. We test the three methods using data from the continuous VLBI campaigns CONT02–CONT14. We find clear improvements when applying methods 1 and 3 for CONT05 campaign, however, the results are degraded for the other campaigns.
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Acknowledgements
We are grateful to the International VLBI Service for Geodesy and Astrometry (IVS, Schuh and Behrend 2012) for providing the VLBI data and to the VLBI stations Algopark, HartRAO, Kokee, Onsala, Tsukuba, and Wettzell for providing the WVR data. This work was supported by the Austrian Science Fund (FWF), project number P24187-N21.
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Nilsson, T., Soja, B., Karbon, M., Heinkelmann, R., Schuh, H. (2017). Water Vapor Radiometer Data in Very Long Baseline Interferometry Data Analysis. In: Freymueller, J.T., Sánchez, L. (eds) International Symposium on Earth and Environmental Sciences for Future Generations. International Association of Geodesy Symposia, vol 147. Springer, Cham. https://doi.org/10.1007/1345_2017_264
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DOI: https://doi.org/10.1007/1345_2017_264
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-69169-5
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