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The AUSTRAL VLBI observing program.

L Plank1, J E J Lovell1, J N McCallum1

  • 11University of Tasmania, Private Bag 37, Hobart, 7001 Australia.

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|February 7, 2020
PubMed
Summary
This summary is machine-generated.

The AUSTRAL observing program improved geodetic and astrometric very long baseline interferometry (VLBI) results by a factor of two. This enhancement was achieved through optimized scheduling, increased observations, and automated operations for better reference frames and Earth orientation parameters.

Keywords:
AUSTRALCelestial reference frame (CRF)GeodesyTerrestrial reference frame (TRF)Very long baseline interferometry (VLBI)

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Area of Science:

  • Geodesy and Astrometry
  • Radio Astronomy
  • Earth Science

Background:

  • The AUSTRAL observing program initiated in 2011 utilizes new Australian AuScope VLBI antennas.
  • It incorporates international antennas from New Zealand and South Africa to form a southern hemisphere array.
  • These antennas are designed for next-generation VLBI, enabling higher data rates and more frequent observations than standard International VLBI Service (IVS) sessions.

Purpose of the Study:

  • To describe the continuous development of AUSTRAL sessions.
  • To highlight improvements in baseline length repeatabilities.
  • To assess the contribution of AUSTRAL sessions to geodetic and astrometric products.

Main Methods:

  • Implementing advanced scheduling strategies and increasing the number of observations.
  • Focusing on automated operation and efficient data logistics.
  • Performing 151 AUSTRAL sessions and comparing results with IVS sessions.

Main Results:

  • Achieved a factor of two improvement in baseline length repeatabilities since the program's inception.
  • Demonstrated the significant contribution of AUSTRAL sessions to VLBI end-products.
  • Showcased the suitability of AUSTRAL data for determining baselines, station coordinates, source coordinates, and Earth orientation parameters.

Conclusions:

  • The AUSTRAL program has successfully enhanced the precision of geodetic and astrometric measurements.
  • Optimized observing strategies and increased data volume are key to these improvements.
  • AUSTRAL sessions are a vital component for establishing accurate terrestrial and celestial reference frames and Earth orientation parameters.