Simulating the effects of quasar structure on parameters from geodetic VLBI

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• 作者：Stanislav S. Shabala ; Jamie N. McCallum ; Lucia Plank ; Johannes B?hm
• 关键词：Geodesy ; Very long baseline interferometry (VLBI) ; Astrometry ; Celestial reference frame (CRF)
• 刊名：Journal of Geodesy
• 出版年：2015
• 出版时间：September 2015
• 年：2015
• 卷：89
• 期：9
• 页码：873-886
• 全文大小：2,275 KB
• 参考文献：B?hm J, B?hm S, Nilsson T, Pany A, Plank L, Spicakova H, Teke K, Schuh H (2012) The New Vienna VLBI Software. In: Kenyon S, Pacino MC, Marti URS (eds) Proceedings of the 2009 IAG Symposium, Buenos Aires, Argentina. Series: International Association of Geodesy Symposia, vol 136. 31 Aug- Sep 2009, pp 1007-012 (ISBN 978-3-642-20337-4)
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• 作者单位：Stanislav S. Shabala (1)
  Jamie N. McCallum (1)
  Lucia Plank (1)
  Johannes B?hm (2)
  
  1. School of Physical Sciences, University of Tasmania, Private Bag 37, Hobart, TAS, 7001, Australia
  2. Department of Geodesy and Geoinformation, Vienna University of Technology, Gusshausstrasse 27-29, 1040, Vienna, Austria
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geophysics and Geodesy
  Mathematical Applications in Geosciences
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-1394

文摘

We investigate the effects of quasar structure on geodetic very long baseline interferometry (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 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 % of the troposphere and clock effects. Our simulations confirm analytical predictions that source structure mitigation strategies must be developed in order to achieve millimetre-level VLBI position accuracy. Keywords Geodesy Very long baseline interferometry (VLBI) Astrometry Celestial reference frame (CRF)