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| Titel |
Scheduling of VLBI satellite observations for an improved ITRF |
| VerfasserIn |
Andreas Hellerschmied, Johannes Böhm, Alexander Neidhardt, Rüdiger Haas, Jan Kodet, Lucia Plank |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250113716
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| Publikation (Nr.) |
 EGU/EGU2015-13935.pdf |
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| Zusammenfassung |
| Observations of Earth orbiting satellites with the Very Long Baseline Interferometry (VLBI)
technique provide a variety of new possibilities and promote the integration of
different geodetic techniques, which is one of the main purposes of GGOS, the Global
Geodetic Observing System of the IAG. Promising applications can be found e.g.
in the field of inter-technique frame ties, having the potential to improve future
realizations of the International Terrestrial Reference Frame (ITRF). Although
several test observations to GNSS satellites have been carried out in recent years, this
approach is still far away from being applied operationally. Difficulties already start at
the observation planning level, with the standard VLBI scheduling software not
being prepared to include satellites as observation targets in the required control
files.
The newly developed satellite scheduling module of the Vienna VLBI Software (VieVS)
for the planning of satellite observations with VLBI antennas offers a solution to this. It
allows the user to prepare schedules for selected satellites, which are simultaneously visible
from a chosen station network. The generated schedule files in the current VEX format
provide the possibility to carry out actual satellite observations with standard geodetic
antennas, e.g. of the IVS network. The antennas can be controlled directly with
the issued schedule files by commanding sequences of discrete celestial positions,
without the requirement of modifications in the antenna control intended for satellite
tracking.
In January 2014 several successful test observations to GLONASS satellites were carried
out on the baseline Onsala-Wettzell based on schedules generated with VieVS. Correlations
of the recorded data showed that the observations – and therefore the scheduling
with VieVS – were successful. The next step is to update the new software for the
possibility to combine observations to satellites and to quasars in one schedule. The
development of convenient scheduling software in the form of the new VieVS module
is important to promote further research and development in this specific field. |
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