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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, J
We 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 Geodesy

Volume

89

Issue

9

Pagination

873-886

ISSN

0949-7714

Department/School

School of Natural Sciences

Publisher

Springer-Verlag

Place of publication

175 Fifth Ave, New York, USA, Ny, 10010

Rights statement

Copyright 2015 Springer-Verlag Berlin Heidelberg

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the physical sciences

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