Articles | Volume 55
https://doi.org/10.5194/adgeo-55-23-2021
https://doi.org/10.5194/adgeo-55-23-2021
26 Feb 2021
 | 26 Feb 2021

Unconstrained Estimation of VLBI Global Observing System Station Coordinates

Markus Mikschi, Johannes Böhm, and Matthias Schartner

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Cited articles

Altamimi, Z., Rebischung, P., Métivier, L., and Collilieux, X.: ITRF2014: A new release of the International Terrestrial Reference Frame modeling nonlinear station motions, J. Geophys. Res.-Sol. Ea., 121, 6109–6131, https://doi.org/10.1002/2016JB013098, 2016. a
Bizouard, C., Lambert, S., Gattano, C., Becker, O., and Richard, J. Y.: The IERS EOP 14C04 solution for Earth orientation parameters consistent with ITRF 2014, J. Geodesy, 93, 621–633, https://doi.org/10.1007/s00190-018-1186-3, 2019. a
Böhm, J., Böhm, S., Boisits, J., Girdiuk, A., Gruber, J., Hellerschmied, A., Krásná, H., Landskron, D., Madzak, M., Mayer, D., McCallum, J., McCallum, L., Schartner, M., and Teke, K.: Vienna VLBI and Satellite Software (VieVS) for Geodesy and Astrometry, PASP, 130, 044503, https://doi.org/10.1088/1538-3873/aaa22b, 2018. a
Davis, J. L., Herring, T. A., Shapiro, I. I., Rogers, A. E. E., and Elgered, G.: Geodesy by radio interferometry: Effects of atmospheric modeling errors on estimates of baseline length, Radio Sci., 20, 1593–1607, https://doi.org/10.1029/RS020i006p01593, 1985.  a
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Short summary
The coordinates of radio telescopes, which are part of the emerging VLBI Global Observing System, were estimated in a least squares unconstrained adjustment. The higher number of observations per time with better sky coverage, which these telescopes can produce, was optimally utilized by testing different intervals for the tropospheric delay estimation. We found that a short estimation interval of 15 min for the tropospheric gradients with a 45 min interval for the zenith wet delay perform best.