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L. Plank, J. Lovell, J. McCallum, J. Böhm, D. Mayer:
"Hb-Ho: Observations with the sibling telescope in Hobart";
in: "Proceedings of the 22nd European VLBI Group for Geodesy and Astrometry Working Meeting", European VLBI Group for Geodesy and Astrometry, 2015, 112 - 116.

With the transition to VGOS, co-located radio telescopes will be common at many sites. This can
be as a sibling telescope, when a VGOS antenna is built next to a legacy one or as the concept of a twin telescope, with two identical VGOS antennas. Besides a number of new observing possibilities in a network, such a configuration also allows for the investigation of local effects or antenna-specific systematics. This is for example the measurement of the local baseline with VLBI and the subsequent comparison with the local tie as determined with classical surveying. The comparison of redundant observations to other antennas can be used as independent verification and identify systematic delays specific to each antenna. Lastly, co-location offers new possibilities in analysis, by combining common parameters like station positions, tropospheric conditions or clock modelling. The two telescopes in Hobart, (12m-Hb, 26m-Ho) have observed in more than 70 common IVS sessions, offering a great dataset for studying the performance of a sibling telescope. In addition, dedicated Hb-Ho experiments were performed in 2014. We report on differences found in redundant observations, compare common parameters, determine the local baseline and its variations, and report on newly applied scheduling and analysis strategies.

Sibling Telescope, Analysis, Twin Telescope

https://publik.tuwien.ac.at/files/publik_242573.pdf