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Challenges for geodetic VLBI in the southern hemisphere
Citation
Plank, L and Lovell, JEJ and Shabala, SS and Bohm, J and Titov, O, Challenges for geodetic VLBI in the southern hemisphere, Advances in Space Research, 56, (2) pp. 304-313. ISSN 0273-1177 (2015) [Refereed Article]
Copyright Statement
Copyright 2015 COSPAR. Published by Elsevier Ltd. All rights reserved.
DOI: doi:10.1016/j.asr.2015.04.022
Abstract
Inhomogeneous networks and reference frames are an important issue for Very Long Baseline Interferometry (VLBI). In this work we examine the performance of southern stations and baselines in routine VLBI experiments. A positive impact on baseline length repeatabilities of the increased observing effort by the Australian AuScope VLBI antennas is found by analysing three years of global rapid-turnaround VLBI sessions: while worse results are found for southern baselines compared to northern baselines for the first half of the investigated sessions, the northern and southern baseline length repeatabilities are about the same in the second half of the period. In simulations, the actual observing plan with a significantly lower number of observations for southern stations is identified as a major reason for the worse length WRMS for southern baselines, though other factors seem to influence the results as well. Simulating radio source position uncertainties, effects of up to 10 mm are found on baseline length WRMS for long southern baselines. Improving all source position uncertainties through more frequent observations to better than 50 μas could reduce this effect by up to 30%.
Item Details
Item Type: | Refereed Article |
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Keywords: | VLBI, southern hemisphere reference frames, source uncertainties, IVS, AuScope |
Research Division: | Earth Sciences |
Research Group: | Geophysics |
Research Field: | Geodesy |
Objective Division: | Expanding Knowledge |
Objective Group: | Expanding knowledge |
Objective Field: | Expanding knowledge in the physical sciences |
UTAS Author: | Plank, L (Dr Lucia McCallum) |
UTAS Author: | Lovell, JEJ (Dr Jim Lovell) |
UTAS Author: | Shabala, SS (Associate Professor Stas Shabala) |
ID Code: | 100258 |
Year Published: | 2015 |
Funding Support: | Australian Research Council (DE130101399) |
Web of Science® Times Cited: | 9 |
Deposited By: | Mathematics and Physics |
Deposited On: | 2015-05-08 |
Last Modified: | 2017-10-25 |
Downloads: | 0 |
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