VLBI terrestrial reference frame contributions to ITRF2008

Böckmann, S.; Artz, Thomas; Nothnagel, A.

doi:10.1007/s00190-009-0357-7

Cited by 67 publications

(34 citation statements)

References 26 publications

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“…The volume of the spanned network correlates with the expected accuracy of measured Earth orientation parameters (Malkin 2009), and uneven antenna distribution makes the results prone to systematic errors (Böckmann et al 2010). Traditionally, the Northern Hemisphere is much more strongly represented than the Southern Hemisphere.…”

Section: Introductionmentioning

confidence: 97%

The AUSTRAL VLBI observing program

Plank

Lovell

McCallum

et al. 2016

J Geod

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The AUSTRAL observing program was started in 2011, performing geodetic and astrometric very long baseline interferometry (VLBI) sessions using the new Australian AuScope VLBI antennas at Hobart, Katherine, and Yarragadee, with contribution from the Warkworth (New Zealand) 12 m and Hartebeesthoek (South Africa) 15 m antennas to make a southern hemisphere array of telescopes with similar design and capability. Designed in the style of the nextgeneration VLBI system, these small and fast antennas allow for a new way of observing, comprising higher data rates and more observations than the standard observing sessions coordinated by the International VLBI Service for Geodesy and Astrometry (IVS). In this contribution, the continuous development of the AUSTRAL sessions is described, leading to an improvement of the results in terms of baseline length repeatabilities by a factor of two since the start of this program. The focus is on the scheduling strategy and increased number of observations, aspects of automated operation, and data logistics, as well as results of the 151 AUSTRAL sessions performed so far. The high number of the AUSTRAL

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Section: Introductionmentioning

confidence: 97%

The AUSTRAL VLBI observing program

Plank

Lovell

McCallum

et al. 2016

J Geod

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“…In all solutions, the elevation cut-off was set to 5 • . Station coordinates were estimated as global parameters with no-net rotation and no-net translation constraints with respect to the VTRF 2008A (Böckmann et al 2010) on the coordinates and velocities of 24 stations. Nonlinear motions of antennas at Fort Davis (Texas), Pie Town (New Mexico), Fairbanks (Alaska), TIGO at Concepción (Chile), and Tsukuba (Japan) were modeled by splines.…”

Section: Introductionmentioning

confidence: 99%

Time stability of the ICRF2 axes

Lambert¹

2013

A&A

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Aims. I assess the astrometric stability of the 295 defining sources of the current best realization of the International Celestial Reference System (ICRS): the second realization of the International Celestial Reference Frame (ICRF2), constructed and published in 2009 after the analysis of millions of VLBI observations at 2 and 8 GHz between 1979.6 and 2009.2. I also assess the time evolution of the ICRF2 axis stability. Methods. I derived coordinate time series of hundreds of quasars monitored by the regular geodetic VLBI program of the International VLBI Service for Geodesy and Astrometry (IVS). The axis stability was studied by constructing annual reference frames based on the ICRF2 defining sources. The time variable frame stability was obtained by computing the deformation parameters that lead from one frame to the next. Results. I show that, although the astrometric stability of some of the ICRF2 defining sources has slightly degraded since 2009.2, the ensemble still constitutes a very stable reference frame. The current estimation of the axis stability over 1979. .1 remains at the same level as the one estimated over 1979.6-2009.2, i.e., on the order of 20 μas for each axis.

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“…It was specified that the input data shall conform to the IERS Conventions 2003 (the up-to-date version at that time) [McCarthy et al 2003]. The individual time series were combined per-technique by the four responsible technique-specific combination centers, namely the National Ressources Canada (NRCan) for the IGS [Ferland 2010;Ferland et al 2008], the IGG of the University Bonn, Germany, for the IVS [Böckmann et al 2010], the Agenzia Spaziale Italiana (ASI) for the ILRS [Bianco et al 2000;E. Pavlis et al 2010] and the Collecte Localisation par Satellite (CLS) in cooperation with the Center National d'Etudes Spatiales (CNES), France, and GSFC at NASA, USA, for the IDS .…”

Section: The Current Itrs Realization the Itrf 2008mentioning

confidence: 99%