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Sensors 2018, 18(5), 1587; https://doi.org/10.3390/s18051587

Observing APOD with the AuScope VLBI Array

1
Department of Geodesy and Geoinformation, Technische Universität Wien, Gußhausstraße 27–29/E120.4, A-1040 Vienna, Austria
2
School of Physical Science, University of Tasmania, Private Bag 25, Hobart TAS 7001, Australia
3
National Astronomic Observatory, 20A Datun Road, Beijing 100012, China
4
Beijing Aerospace Control Center, 26 Beiqing Road, Beijing 100094, China
*
Author to whom correspondence should be addressed.
Received: 2 May 2018 / Revised: 8 May 2018 / Accepted: 11 May 2018 / Published: 16 May 2018
(This article belongs to the Section Remote Sensors)
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Abstract

The possibility to observe satellites with the geodetic Very Long Baseline Interferometry (VLBI) technique is vividly discussed in the geodetic community, particularly with regard to future co-location satellite missions. The Chinese APOD-A nano satellite can be considered as a first prototype—suitable for practical observation tests—combining the techniques Satellite Laser Ranging (SLR), Global Navigation Satellite Systems (GNSS) and VLBI on a single platform in a Low Earth Orbit (LEO). Unfortunately, it has hardly been observed by VLBI, so major studies towards actual frame ties could not be performed. The main reason for the lack of observations was that VLBI observations of satellites are non-standard, and suitable observing strategies were not in place for this mission. This work now presents the first serious attempt to observe the satellite with a VLBI network over multiple passes. We introduce a series of experiments with the AuScope geodetic VLBI array which were carried out in November 2016, and describe all steps integrated in the established process chain: the experiment design and observation planning, the antenna tracking and control scheme, correlation and derivation of baseline-delays, and the data analysis yielding delay residuals on the level of 10 ns. The developed procedure chain can now serve as reference for future experiments, hopefully enabling the global VLBI network to be prepared for the next co-location satellite mission. View Full-Text
Keywords: VLBI; APOD; AuScope; satellite tracking VLBI; APOD; AuScope; satellite tracking
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Hellerschmied, A.; McCallum, L.; McCallum, J.; Sun, J.; Böhm, J.; Cao, J. Observing APOD with the AuScope VLBI Array. Sensors 2018, 18, 1587.

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