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Short-baseline interferometry local-tie experiments at the Onsala Space Observatory
Journal of Geodesy ( IF 4.4 ) Pub Date : 2021-04-22 , DOI: 10.1007/s00190-021-01509-5
Eskil Varenius , Rüdiger Haas , Tobias Nilsson

We present results from observation, correlation and analysis of interferometric measurements between the three geodetic very long baseline interferometry (VLBI) stations at the Onsala Space Observatory. In total, 25 sessions were observed in 2019 and 2020, most of them 24 h long, all using X band only. These involved the legacy VLBI station ONSALA60 and the Onsala twin telescopes, ONSA13NE and ONSA13SW, two broadband stations for the next-generation geodetic VLBI global observing system (VGOS). We used two analysis packages: \(\nu \) Solve to pre-process the data and solve ambiguities, and ASCOT to solve for station positions, including modelling gravitational deformation of the radio telescopes and other significant effects. We obtained weighted root mean square post-fit residuals for each session on the order of 10–15 ps using group-delays and 2–5 ps using phase-delays. The best performance was achieved on the (rather short) baseline between the VGOS stations. As the main result of this work, we determined the coordinates of the Onsala twin telescopes in VTRF2020b with sub-millimetre precision. This new set of coordinates should be used from now on for scheduling, correlation, as a priori for data analyses, and for comparison with classical local-tie techniques. Finally, we find that positions estimated from phase-delays are offset \(\sim +3\) mm in the up-component with respect to group-delays. Additional modelling of (elevation dependent) effects may contribute to the future understanding of this offset.



中文翻译:

在Onsala空间天文台进行的短基线干涉测量本地联系实验

我们介绍了Onsala空间天文台的三个大地测量极长基线干涉测量(VLBI)站之间的干涉测量结果的观察,相关和分析结果。在2019年和2020年,总共观察到25个疗程,其中大多数为24小时长,均仅使用X波段。其中涉及遗留的VLBI台站ONSALA60和Onsala双筒望远镜ONSA13NE和ONSA13SW,这两个宽带站用于下一代大地VLBI全球观测系统(VGOS)。我们使用了两个分析程序包:\(\ nu \) 解决方案用于预处理数据并解决歧义性,以及ASCOT解决电台的位置,包括模拟射电望远镜的重力变形和其他重大影响。我们使用组延迟获得了每次会话的加权均方根拟合后残差,数量级为10–15 ps,相位延迟为2–5 ps。在VGOS站之间的(相当短的)基线上实现了最佳性能。作为这项工作的主要结果,我们确定了VTRF2020b中Onsala双筒望远镜的坐标,精度达到了亚毫米级。从现在开始,应该使用这组新的坐标进行调度,关联,作为数据分析的先验条件,并与经典的本地联系技术进行比较。最后,我们发现根据相位延迟估算出的位置偏移量为\(\ sim +3 \) 相对于组延迟,在up分量中为mm。(与海拔相关的)效果的其他建模可能有助于将来对此偏移量的理解。

更新日期:2021-04-22
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