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Simulating the eff ects of quasar structure on parameters from geodetic VLBI


Shabala, SS and McCallum, JN and Plank, L and Bohm, J, Simulating the eff ects of quasar structure on parameters from geodetic VLBI, Journal of Geodesy, 89, (9) pp. 873-886. ISSN 0949-7714 (2015) [Refereed Article]

Copyright Statement

Copyright 2015 Springer-Verlag Berlin Heidelberg

DOI: doi:10.1007/s00190-015-0820-6


We investigate the eff ects of quasar structure on geodetic VLBI measurements. We create catalogues of simulated and real quasars with a range of structure indices, and use these to generate synthetic CONT11 observations with the Vienna VLBI Software (VieVS) simulator tool. We systematically investigate the e ffects of quasars with diff erent amounts of source structure, and find that source structure can a ffect station positions at the one millimetre level. This e ffect is stronger for isolated stations. Overall, source structure is found to contribute to about 10 percent of the troposphere and clock e ffects. Our simulations con firm analytical predictions that source structure mitigation strategies must be developed in order to achieve millimetre-level VLBI position accuracy.

Item Details

Item Type:Refereed Article
Keywords:geodesy, Very Long Baseline Interferometry (VLBI), astrometry, Celestial Reference Frame (CRF)
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:Shabala, SS (Associate Professor Stas Shabala)
UTAS Author:McCallum, JN (Dr Jamie McCallum)
UTAS Author:Plank, L (Dr Lucia McCallum)
ID Code:100257
Year Published:2015
Funding Support:Australian Research Council (DE130101399)
Web of Science® Times Cited:7
Deposited By:Mathematics and Physics
Deposited On:2015-05-08
Last Modified:2017-11-06

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