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Automated and dynamic scheduling for geodetic VLBI – a simulation study for AuScope and global networks

Iles, EJL ORCID: 0000-0002-5024-5327, McCallum, L ORCID: 0000-0002-7563-9488, Lovell, JEJ ORCID: 0000-0001-5273-9817 and McCallum, JN ORCID: 0000-0002-0233-6937 2018 , 'Automated and dynamic scheduling for geodetic VLBI – a simulation study for AuScope and global networks' , Advances in Space Research, vol. 61, no. 3 , pp. 962-973 , doi: 10.1016/j.asr.2017.11.012.

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Abstract

As we move into the next era of geodetic VLBI, the scheduling process is one focus for improvement in terms of increased flexibility and the ability to react with changing conditions. A range of simulations were conducted to ascertain the impact of scheduling on geodetic results such as Earth Orientation Parameters (EOPs) and station coordinates. The potential capabilities of new automated scheduling modes were also simulated, using the so-called ‘dynamic scheduling’ technique. The primary aim was to improve efficiency for both cost and time without losing geodetic precision, particularly to maximise the uses of the Australian AuScope VLBI array.We show that short breaks in observation will not significantly degrade the results of a typical 24 h experiment, whereas simply shortening observing time degrades precision exponentially. We also confirm the new automated, dynamic scheduling mode is capable of producing the same standard of result as a traditional schedule, with close to real-time flexibility. Further, it is possible to use the dynamic scheduler to augment the 3 station Australian AuScope array and thereby attain EOPs of the current global precision with only intermittent contribution from 2 additional stations. We thus confirm automated, dynamic scheduling bears great potential for flexibility and automation in line with aims for future continuous VLBI operations.

Item Type: Article
Authors/Creators:Iles, EJL and McCallum, L and Lovell, JEJ and McCallum, JN
Keywords: geodesy, Very Long Baseline Interferometry (VLBI), scheduling, simulation, AuScope
Journal or Publication Title: Advances in Space Research
Publisher: Pergamon-Elsevier Science Ltd
ISSN: 0273-1177
DOI / ID Number: 10.1016/j.asr.2017.11.012
Copyright Information:

Copyright 2017 COSPAR. Published by Elsevier Ltd. All rights reserved.

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