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Atmospheric modeling for co-located VLBI antennas and twin telescopes
Abstract In the next generation VLBI network, the VLBI global observing system (VGOS), there will be several twin telescopes, i.e. stations equipped with a pair of VLBI telescopes with identical design. In this work we test the possibility of combining the tropospheric parameters of these two telescopes within the VLBI data analysis. This is done through simulations of a possible future VGOS network containing one twin telescope. We simulate the tropospheric delays with the help of a turbulence model, approximately taking into account the distance between the antennas. The results show that the combination of tropospheric delays can improve the station position repeatability by about 15 % as long as the distance is smaller than 1 km. The main improvement is in the repeatability of the baseline vector between the antennas. However, the results are strongly dependent on how the observations are scheduled for the twin telescope. The simulation results are confirmed by an analysis of the CONT14 campaign, where the tropospheric parameters of the two Hobart antennas are combined. Furthermore, we also discuss the study of combining other parameters for the twin telescope, i.e. the clocks and/or the station positions.
Atmospheric modeling for co-located VLBI antennas and twin telescopes
Abstract In the next generation VLBI network, the VLBI global observing system (VGOS), there will be several twin telescopes, i.e. stations equipped with a pair of VLBI telescopes with identical design. In this work we test the possibility of combining the tropospheric parameters of these two telescopes within the VLBI data analysis. This is done through simulations of a possible future VGOS network containing one twin telescope. We simulate the tropospheric delays with the help of a turbulence model, approximately taking into account the distance between the antennas. The results show that the combination of tropospheric delays can improve the station position repeatability by about 15 % as long as the distance is smaller than 1 km. The main improvement is in the repeatability of the baseline vector between the antennas. However, the results are strongly dependent on how the observations are scheduled for the twin telescope. The simulation results are confirmed by an analysis of the CONT14 campaign, where the tropospheric parameters of the two Hobart antennas are combined. Furthermore, we also discuss the study of combining other parameters for the twin telescope, i.e. the clocks and/or the station positions.
Atmospheric modeling for co-located VLBI antennas and twin telescopes
Nilsson, Tobias (author) / Karbon, Maria (author) / Soja, Benedikt (author) / Heinkelmann, Robert (author) / Lu, Cuixian (author) / Schuh, Harald (author)
Journal of Geodesy ; 89
2015
Article (Journal)
English
BKL:
38.73
Geodäsie
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