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In VieVS, source based scheduling (as originally suggested by Bill Petrachenko and Tony Searle at NRCan) has been implemented with the possibility of two or four sources open for observation at a particular time. The Vienna group has been testing how the results with this approach differ from using the classical station based scheduling as also used by SKED. Details are provided in the open-access Journal of Geodesy paper by Sun et al. 2014.
A preliminary evaluation has also been carried out on the impact of the cutoff angle in VLBI observations. Tierno Ros et al. (2013) have taken a 16-station network and they have created schedules
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