Automated IVS Reference Point Monitoring - First Experience from the Onsala Space Observatory
Konferensbidrag (offentliggjort, men ej förlagsutgivet), 2013
The realization of the International Terrestrial
Reference Frame (ITRF) builds upon a
combination of results derived from several geodetic
space techniques, such as Very Long Baseline Interferometry
(VLBI), Satellite and Lunar Laser Ranging
(SLR and LLR) or Global Navigation Satellite Systems
(GNSS). To combine the different techniques and
their results in a meaningful way, co-location sites are
important where equipment for several techniques is
located reasonably close to each other. The relative
geometries (local tie vectors) between the geometric
reference points of the different techniques can be
derived by terrestrial survey at these co-location
sites. Within the Global Geodetic Observing System
(GGOS) the requirements in terms of e.g. accuracy
and frequency of local survey campaigns have been
increased to guarantee that the local tie vectors reach
an utmost level of global accuracy. In response to
this request we developed a concept to achieve automated
and continuous monitoring of radio telescope
reference points. This concept was realized and tested
in 2012 at the Onsala Space Observatory where an
automated monitoring system was installed for a
continual determination of the reference point of
the 20 m radio telescope. The results confirm that
uncertainties on the sub-mm level can be achieved with
this approach.
Monitoring
Error Budget
Reference Point Determination
Radio Telescope
VLBI