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Simulating the effects of quasar structure on parameters from geodetic VLBI
journal contribution
posted on 2023-05-18, 09:42 authored by Stanislav ShabalaStanislav Shabala, Jamie McCallumJamie McCallum, Lucia McCallumLucia McCallum, Bohm, JWe investigate the effects 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 effects of quasars with different amounts of source structure, and find that source structure can affect station positions at the one millimetre level. This effect is stronger for isolated stations. Overall, source structure is found to contribute to about 10 percent of the troposphere and clock effects. Our simulations con firm analytical predictions that source structure mitigation strategies must be developed in order to achieve millimetre-level VLBI position accuracy.
Funding
Australian Research Council
History
Publication title
Journal of GeodesyVolume
89Issue
9Pagination
873-886ISSN
0949-7714Department/School
School of Natural SciencesPublisher
Springer-VerlagPlace of publication
175 Fifth Ave, New York, USA, Ny, 10010Rights statement
Copyright 2015 Springer-Verlag Berlin HeidelbergRepository Status
- Restricted