Evaluations of the geodetic parameters derived from VLBI Global Observing System (VGOS)
| Autor: | Hellmers, H., Modiri, S., Thaller, D., Bloßfeld, M. |
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| Rok vydání: | 2023 |
| Zdroj: | XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) |
| DOI: | 10.57757/iugg23-0597 |
| Popis: | In the past few years, the VLBI Global Observing System (VGOS) has been established with the objective of improving the data from VLBI in order to meet the increasingly demanding requirements regarding the rotation of the Earth and the reference frame determination. A faster and smaller antenna is employed and a broader spectrum of signals is observed in comparison to conventional VLBI observations for improved sensitivity and data accuracy. Due to the current state of the establishment with a broad number of VGOS sessions, we are able to conduct a detailed investigation of the parameters derived from VGOS.As VGOS stations include newly installed antennas starting in 2017, the timespan was too short up to now for deriving a stable global solution. Therefore, the existing IVS reference frame or the official international terrestrial reference frames (ITRF) do not include yet stable station position and velocities for the VGOS stations. As a consequence, it is necessary to determine precise station positions in an ongoing procedure and update regularly the IVS reference frame. Therefore, the current available VGOS sessions - from December 2017 to the present - are used to estimate the coordinates and velocity of the stations.This contribution focuses on the feasibility of combining VGOS sessions into a combined global solution (TRF), as well as the possibility of integrating new VGOS stations into the TRF. In addition, for getting information about the accuracy of Earth Rotation Parameters, estimates of dUT1 as well as polar motion are compared to external time series (Bulletin A, IERS C04) as well as to the conventional R1/R4 VLBI sessions. The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) |
| Databáze: | OpenAIRE |
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