 |
| Titel |
New VLBI Infrastructure for Earth Rotation Monitoring at Wettzell |
| VerfasserIn |
Torben Schüler, Axel Nothnagel, Alexander Neidhardt, Gerhard Kronschnabl, Urs Hugentobler, Hansjörg Kutterer, Johannes Ihde |
| Konferenz |
EGU General Assembly 2014
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250093710
|
| Publikation (Nr.) |
 EGU/EGU2014-8691.pdf |
|
|
|
|
|
| Zusammenfassung |
| Very Long Baseline Interferometry (VLBI) is a key technology for precise monitoring
of Earth’s rotation. VLBI is the only space geodetic technique that allows for the
determination of the absolute orientation of the Earth’s rotation axis in space (nutation) and
the absolute rotation angle of the Earth’s body (UT1). VLBI is used to realize the
International Celestial Reference Frame (ICRF) and contributes to the realization of the
International Terrestrial Reference Frame (ITRF). In order to further improve accuracy,
latency and availability of VLBI observations the International VLBI Service for
Geodesy and Astrometry (IVS) developed the VLBI2010 concept aiming at more
observations, larger bandwidth, and near-real time correlation. The implementation of
the concept would allow for an uninterrupted high-accuracy monitoring of Earth’s
rotation.
The Geodetic Observatory Wettzell is operated by the German Federal Agency for
Cartography and Geodesy (BKG) together with Technische Universität Müchen (TUM) in
the context of the Research Group Satellite Geodesy (FGS), a consortium of BKG, TUM,
German Geodetic Research Institute (DFGI) and University of Bonn, Germany. The
Wettzell observatory is on its way to operate a radio telescope triple: The 20 m radio
telescope has been involved into geodetic VLBI observations since 1983. Recently two
new 13.2 m VLBI telescopes were installed – the TWIN telescope – which adhere
to the VLBI2010 concept and which will be part of VGOS, the newly developed
VLBI Global Observing System of the International VLBI Service for Geodesy and
Astrometry (IVS). Currently the high-frequency electronics, broadband receivers
and feed horns, are being integrated and first operation is expected this year. The
two telescopes allow for novel observation strategies, also in conjunction with the
existing 20 m telescope. The upcoming new VLBI infrastructure will lead to more
accurate, continuous and short-latency monitoring of the rotation of the Earth in space. |
|
|
|
|
|
|