Dr Lucia McCallum is a Geodesist at the School of Physical Science, working in the group of radio astronomy. Her field of research is the Very Long Baseline Interferometry (VLBI), using signals from far distant radio galaxies to measure the Earth. After finishing her PhD at the Technische Universität in Vienna (Austria), she joined UTAS as a post-doc in 2014. In 2015, Dr McCallum received an Erwin Schrödinger Fellowship, funded by the Austrian Science Fund (FWF), allowing her to prolong the work at UTAS for another two years. As a University Associate she works with the University's own radio telescopes at Mt. Pleasant, the Northern Territory and in Western Australia, in common measurements together with telescopes all over the world.
|Degree||Thesis Title||University||Country||Date of Award|
|Dr. techn.||VLBI satellite tracking for the realization of frame ties||Technische Universität Wien||Austria||25/11/2013|
|Dipl.-Ing. (eq. MSc)||Calculation of the Earth Rotation Vector with VLBI and Ringlaser measurements||Technische Universität Wien||Austria||5/11/2008|
Languages (other than English)
- 2015 - present: UTAS University Associate; Erwin Schrödinger Fellow of the Austrian Science Fund, project Sibling Telescopes
- 2014-2015: UTAS, Super Science Fellow in astronomical and Geodetic VLBI, School of Physical Sciences
- 2012-2013: Project Assistant, Department of Geodesy and Geoinformation, Vienna University of Technology. Project: 'Ties between kinematic and dynamic reference frames (D-VLBI); within the Research Unit Space-Time Reference Systems for Monitoring Global Change and for Precise Navigation in Space'. Funded by the German Research Foundation (DFG)
- 2008-2012: University Assistant, Institute of Geodesy and Geophysics, Vienna University of Technology
Dr McCallum's field of research is Geodesy, the science of measuring the Earth. Our System Earth is complex and we a far from understanding all its interacting processes. On the surface we are subject to constant changes, due to the influences of the Sun and the Moon, the Ocean, or the Atmosphere. In Very Long Baseline Interferometry (VLBI) we use signals from far distant radio galaxies to measure the Earth. In more detail, VLBI is used to measure the Earth's shape, the rotation of the Earth, polar motion, plate tectonics and the variation of these effects. At UTAS, Dr. McCallum uses the university's own radio telescopes at Mt. Pleasant, the Northern Territory and in Western Australia, in common measurements together with telescopes all over the world. The goals of the VLBI group at UTAS are to guarantee best possible performance of our telescopes in global observations and to develop new methods to implement the next generation VLBI global observing system (VGOS). VGOS will be able to measure global distances to the level of a few millimetres, a necessity for important scientific and societal questions in geosciences, as for example the prediction of sea level rise of a few mm per year.
Associate member of the International VLBI Service for Geodesy and Astrometry (IVS)
Modern Space Geodetic techniques
Modern Space Geodetic techniques (lecture), supervision of Honours, MSC, Bachelor theses in the field of VLBI.
- Geodesy and Surveying
- Modern Space Geodetic Techniques (GPS, VLBI)
- Fem-Tech Expert of the Month May 2015 (www.Femtech.at)
- Best Presentation Award, Geodetic Week 2009, Karlsruhe (Germany)
Lucia has close collaboration with other VLBI groups within the IVS worldwide, especially, with the Geo-Institute of the Technische Universität Wien, Austria. Her key topics include: development of VieVS, the Vienna VLBI software for the analysis of geodetic VLBI; improved VLBI analysis; source structure effects in VLBI; and undertaking and planning observations.
'Sibling Radio Telescopes for Geodesy – Optimising the use of co-located VLBI telescopes in the southern hemisphere' - Schrödinger Fellowship of the Austrian Science Fund (FWF). www.fwf.ac.at
The upcoming VLBI2010 Geodetic Observing System (VGOS) has the potential to improve the performance of geodetic Very Long Baseline Interferometry (VLBI) by about an order of magnitude. The concept includes co-located radio telescopes, either as two identical 'twin-telescope' dishes or as a 'sibling telescope', a combination of a large legacy telescope and a new small VGOS antenna.
Common observations at one site require new observing modes to be developed, but it also offers new analysis options for improved results. In addition, both telescopes need to be accurately connected to each other. The so-called local tie is essential to connect the present VLBI reference frame to the new VGOS frame, as well as to connect VLBI to the other space geodetic techniques making up the International Terrestrial Reference Frame (ITRF).
In the project Sibling Telescopes, observations with the Australian AuScope VLBI array, a prototype of the future VGOS system, will be used to optimise observing with sibling telescopes. This comprises new scheduling strategies, improved analysis, and the generation of actual results for the Ho (26m) - Hb (12m) antenna pair in Hobart. Improved planning of the observations will be developed using thorough simulations, answering the question whether it is better to observe the same source or different sources with the sibling telescope. Applying the developed scheduling tool, observations will be planned for the AUSTRAL observing program, using telescopes in Australia, New Zealand, and South Africa. In the analysis of the collected data common parameters will be combined. These are the identical troposphere above the sibling telescope, the parameters of the atomic clock at the station providing the frequency standard to both telescopes, and large-scale antenna movements due to plate tectonics and geodynamical processes. Special attention will be given to the determination of the local tie between the two radio antennas and the comparison between the solution from the VLBI observations and the tie vector determined by local surveying. Precise intra-technique ties will help to improve the inter-technique ties to the other co-located geodetic space techniques, the backbone of the ITRF as a multi-technique solution.
The project Sibling Telescopes will be conducted at the University of Tasmania, operating the Australian AuScope VLBI array. The frequent AUSTRAL sessions offer the perfect test bed for the proposed research. During the return phase at the Vienna University of Technology, the findings will be extended to global networks. The developed tools and strategies will allow the optimal usage of the collected data as well as of the upcoming VGOS system, a global multi-million Euro research infrastructure project, targeted to fulfill future scientific and societal demands on Geosciences.
Fields of Research
- Geodesy (090902)
- Astronomical and Space Sciences (020199)
- Geophysics (040499)
- Cosmology and Extragalactic Astronomy (020103)
- Software Engineering (080309)
- Satellite, Space Vehicle and Missile Design and Testing (090108)
- Expanding Knowledge in the Physical Sciences (970102)
- Expanding Knowledge in the Earth Sciences (970104)
- Expanding Knowledge in Engineering (970109)
- Climate and Climate Change (960399)
- Ecological Economics (919902)
Journal Article(7 outputs)
|2017||Plank L, Hellerschmied A, McCallum J, Bohm J, Lovell J, 'VLBI observations of GNSS-satellites: From scheduling to analysis', Journal of Geodesy pp. 1-14. ISSN 0949-7714 (In Press) [Refereed Article]|
Co-authors: McCallum J; Lovell J
|2017||Plank L, Lovell JEJ, McCallum JN, Mayer D, Reynolds C, et al., 'The AUSTRAL VLBI observing program', Journal of Geodesy, 91, (7) pp. 803-817. ISSN 0949-7714 (2017) [Refereed Article]|
Co-authors: Lovell JEJ; McCallum JN; Shabala SS
|2016||Plank L, Shabala SS, McCallum JN, Krasna H, Petrachenko B, et al., 'On the estimation of a celestial reference frame in the presence of source structure', Monthly Notices of the Royal Astronomical Society, 455, (1) pp. 343-356. ISSN 0035-8711 (2016) [Refereed Article]|
Citations: Scopus - 3Web of Science - 3
Co-authors: Shabala SS; McCallum JN; Rastorgueva-Foi E; Lovell JEJ
|2015||Mayer D, Bohm J, Lovell J, Plank L, Sun J, et al., 'Scheduling Strategies for the AuScope VLBI network', Oesterreichische Zeitschrift fuer Vermessung und Geoinformation, 2-3 pp. 162-168. ISSN 1605-1653 (2015) [Non Refereed Article]|
Co-authors: Lovell J
|2015||Plank L, Lovell JEJ, Shabala SS, Bohm J, 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]|
Citations: Scopus - 3Web of Science - 4
Co-authors: Lovell JEJ; Shabala SS
|2015||Shabala SS, McCallum JN, Plank L, 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]|
Citations: Scopus - 5Web of Science - 4
Co-authors: Shabala SS; McCallum JN
|2014||Plank L, Bohm J, Schuh H, 'Precise station positions from VLBI observations to satellites: a simulation study', Journal of Geodesy, 88, (7) pp. 659-673. ISSN 0949-7714 (2014) [Refereed Article]|
Citations: Scopus - 6Web of Science - 2
Conference Publication(5 outputs)
|2016||Plank L, 'Changes and Impacts - Research into the nature and state of the Australian region', 10 Years of AuScope, 28 June 2016, Adelaide, Australia (2016) [Chair National Conference]|
|2015||Plank L, Bohm J, Schuh H, 'Simulated VLBI Satellite Tracking of the GNSS Constellation: Observing Strategies', Proceedings of the IAG Scientific Assembly in Postdam, Germany, 2013, 2-6 September 2013, Potsdam, Germany, pp. 85-90. ISBN 9783319246031 (2015) [Refereed Conference Paper]|
Citations: Scopus - 1
|2015||Plank L, Lovell JEJ, McCallum J, Rastorgueva-Foi E, Shabala SS, et al., 'Results from the regional AUSTRAL VLBI sessions for Southern Hemisphere reference frames', Proceedings of REFAG 2014, International Association of Geodesy Symposia, 13-17 October 2014, Luxembourg, pp. 129-134. ISSN 0939-9585 (2015) [Refereed Conference Paper]|
Citations: Scopus - 1
Co-authors: Lovell JEJ; McCallum J; Rastorgueva-Foi E; Shabala SS
|2013||Plank L, Spicakova H, Bohm J, Nilsson T, Pany A, et al., 'Systematic errors of a VLBI determined TRF investigated by simulations', International Association of Geodesy Symposia Volume 138, 4-8 October 2010, Chania, Crete, pp. 197-202. ISBN 978-3-642-32997-5 (2013) [Refereed Conference Paper]|
|2012||Bohm J, Bohm S, Nilsson T, Pany A, Plank L, et al., 'The new Vienna VLBI Software VieVS', International Association of Geodesy Symposia Volume 136, 31 August - 4 September, Buenos Aires, Argentina, pp. 1007-1011. ISBN 978-3-642-20337-4 (2012) [Refereed Conference Paper]|
Citations: Scopus - 48
|2013||Plank L, 'VLBI satellite tracking for the realization of frame ties' (2013) [PhD]|
Lucia has been the primary supervisor and co-supervisor of several theses (Bacc, Master, Honours).