Conveners
Poster4-6: Authors in attendance
- Stanislav Shabala (University of Tasmania)
Dr
Guangli Wang
(Shanghai Astronomical Observatory)
14/03/2016, 17:00
6: VLBI Observations of Space Vehicles
Poster Presentation
On Sept. 20, 2015, the Chinese CZ-6 test rocket was launched successfully from TaiYuan Satellite Launch Center, and 20 satellites was sent simultaneously into a circular, near-polar and 520 Km altitude orbit. Among these 20 satellites, four CubSats, named with APOD (Atmospheric density detection and Precise Orbit Determination), are projected for atmospheric density in-situ detection and...
Johannes Boehm
(Technische Universität Wien)
14/03/2016, 17:00
5: Geodetic and Astrometric VLBI Results
Poster Presentation
BACC(Beijing Aerospace Control Center), as the command center for the Chinese space program, got access to VieVS in 2011. Since 2013, IVS VLBI data has been downloaded and analyzed automatically with VieVS at BACC and the geodetic products will be provided firstly in the presentation. VieVS was also used to estimate the coordinates of new Chinese VLBI telescopes with domestic VLBI network in...
Dr
Tobias Nilsson
(GFZ German Research Centre for Geosciences)
14/03/2016, 17:00
5: Geodetic and Astrometric VLBI Results
Poster Presentation
The VLBI Intensive sessions are one-hour long, usually single-baseline VLBI sessions performed every day in order to estimate UT1-UTC. Due to the small number of observations in these sessions, the latency between observation and results is relatively short, normally a few days. However, the accuracy of the UT1-UTC estimates is significantly lower than expected based on their formal errors....
Prof.
Ludwig Combrinck
(HartRAO)
14/03/2016, 17:00
5: Geodetic and Astrometric VLBI Results
Poster Presentation
Relativistic geodesy is typically seen as a new type of gravity potential measurement technique using very high accuracy clocks; these clocks are more stable (by a factor of 100 or 1000) than the hydrogen masers currently used at VLBI stations. In modern terms however, geodesy entails much more than just geodesy of the Earth, therefore the term relativistic geodesy is re-assessed. The possible...
Dr
Aletha de Witt
(Hartebeesthoek Radio Astronomy Observatory)
14/03/2016, 17:00
5: Geodetic and Astrometric VLBI Results
Poster Presentation
K-band (22 GHz) radio observations have the potential to form the basis for the most accurate celestial reference frame ever constructed. Relative to the standard S/X (2.3/8.4 GHz) observing bands, K-band is expected to exhibit a reduction in extended source morphology and core-shift. This reduction in astrophysical systematics should allow for a more stable celestial reference frame at K-band...
Dr
Fengchun Shu
(Shanghai Astronomical Observatory)
14/03/2016, 17:00
6: VLBI Observations of Space Vehicles
Poster Presentation
Using the same frequency standard, a high-precision phase delay can be obtained in a connected element interferometry (CEI) system. Beidou GEO navigation satellite C02 is tracked from a CEI observations, where the CEI of the two stations at hangtiancheng and shahe linked by a phase stabilization system is built by Beijing Aerospace Control Center (BACC). And Beidou GEO navigation satellite C03...
Prof.
Thomas Hobiger
(Chalmers / Onsala Space Observatory)
14/03/2016, 17:00
4: Data Structures and Analysis Strategies in the VGOS Era
Poster Presentation
Onsala Space Observatory hosts two 2.3 m radio telescopes called SALSA ("Such a lovely small antenna") which are utilised to bring front-line interactive astronomy to the classroom. Until now SALSA has been used for astronomical educational purposes solely, in particular demonstrating the concept of single dish measurements. However, it is possible to combine both SALSAs to an interferometer...
Dr
John Gipson
(NVI Inc/GSFC NASA)
14/03/2016, 17:00
4: Data Structures and Analysis Strategies in the VGOS Era
Poster Presentation
An on-going goal of the GSFC Analysis Center is the improvement of the UT1 formal error obtained from the IVS-INT01 sessions, as well as the improvement of related metrics, such as robustness against atmospheric turbulence. Improvement can be achieved by improving the scheduling and/or the analysis of these sessions. Here we report on our latest efforts to improve the performance of the...
Dr
Thomas Artz
(Institute of Geodesy and Geoinformation, University of Bonn)
14/03/2016, 17:00
4: Data Structures and Analysis Strategies in the VGOS Era
Poster Presentation
Although several fully developed VLBI software packages exist already, the VLBI group of the Institute of Geodesy and Geoinformations of Bonn University (ivg) started implementing a new analysis toolbox. The main reason is the need for a flexible environment, which allows for straightforward implementations of new scientific and software-related ideas for VLBI data analysis. Furthermore, we...
Sabine Bachmann
(BKG)
14/03/2016, 17:00
4: Data Structures and Analysis Strategies in the VGOS Era
Poster Presentation
The International VLBI Service for Geodesy and Astrometry (IVS) Combination Center at the Federal Agency for Cartography and Geodesy (BKG, Germany) is responsible for generating combined Earth orientation parameter (EOP) products. Additionally, results of combined station coordinates and a terrestrial reference frame based on VLBI observations are generated. For providing information on the...
Dieter Ullrich
(BKG)
14/03/2016, 17:00
4: Data Structures and Analysis Strategies in the VGOS Era
Poster Presentation
The BKG (Federal Agency for Cartography and Geodesy) Data Center is one
of the three IVS Primary Data Centers. It archives
all VLBI related data of IVS components and provides public access for
the community.
The VLBI Analysis Group of BKG is part of the jointly operated IVS
Analysis Center of BKG and the Institute for Geodesy and
Geoinformation of the University of Bonn. The BKG is...
Mr
Kyriakos Balidakis
(Technische Universität Berlin, Institute of Geodesy and Geoinformation Science, Berlin, Germany)
14/03/2016, 17:00
5: Geodetic and Astrometric VLBI Results
Poster Presentation
In this study, the issue of the quality of meteorological data employed for VLBI data analysis is addressed. Traditionally, ambient barometric pressure and temperature values are used to model the hydrostatic component of the neutral atmospheric propagation delay and the thermal deformation of antennas, in VLBI data analysis. Unlike the other microwave-based space geodetic techniques currently...
Axel Nothnagel
(Institute of Geodesy and Geoinformation, University of Bonn)
,
Rüdiger Haas
(Chalmers University of Technology)
14/03/2016, 17:00
6: VLBI Observations of Space Vehicles
Poster Presentation
The successful deployment of the Chang’E-3 Lander on the Moon on Dec 14th, 2013 has opened a new window for VLBI observations of the Moon. Following proposals to the IVS Observing Program Committee, a global IVS R&D network augmented with two China Deep Space Stations was configured for joint observations of the lander in a project called OCEL (Observing the Chang’E-3 Lander with VLBI). From...
Fengchun Shu
(Shanghai Astronomical Observatory)
14/03/2016, 17:00
5: Geodetic and Astrometric VLBI Results
Poster Presentation
The goal of VLBI Ecliptic Plane Survey (VEPS) is to increase the number of calibrator radio sources within 7.5 degree of the ecliptic plane by surveying a complete sample of sources with single dish flux densities at 5 GHz greater than 50 mJy. A dense grid of calibrators along ecliptic plane with very accurate coordinates is required for many applications, including observations of spacecrafts...
Mr
Gerald Engelhardt
(BKG (Federal Agency for Cartography and Geodesy))
14/03/2016, 17:00
4: Data Structures and Analysis Strategies in the VGOS Era
Poster Presentation
The Tsukuba station in Japan is an essential station in the IVS Intensive series for rapid UT1 estimation. The use of this station in rapid UT1 estimation requires a set of best-predetermined station coordinates but the consequences of the Earthquake in Japan in March 2011 were such that the previously known velocity rates of the station Tsukuba were unusable.
Since 2012, the VLBI group at...
Dr
Shabala Stanislav
(University of Tasmania)
14/03/2016, 17:00
5: Geodetic and Astrometric VLBI Results
Poster Presentation
Radio sources observed in global IVS sessions are mostly flat-spectrum radio-loud quasars. While some quasars appear almost point like, many have extended jet components in addition to compact cores. The structure of these jets often varies on timescales of months to years as the black hole at the centre of the quasar accretes new material and ejects components of radio-emitting plasma. These...
Ms
Glenda Coetzer
(HartRAO)
14/03/2016, 17:00
4: Data Structures and Analysis Strategies in the VGOS Era
Poster Presentation
The Hartebeesthoek Radio Astronomy Observatory (HartRAO) participates in astronomic, astrometric and geodetic Very Long Baseline Interferometry (VLBI) observations using both 26- and 15-m diameter radio telescopes. These as well as additional geodetic data from a Satellite Laser Ranger (SLR), Global Navigation Satellite System (GNSS), Met4 weather stations, a new seismic network must be stored...
Mr
César GATTANO
(SYRTE - Observatoire de Paris)
14/03/2016, 17:00
5: Geodetic and Astrometric VLBI Results
Poster Presentation
Very Long Baseline Interferometry is the only technique that can estimate Earth nutations with an accuracy under the milliarcsecond level. With 35 years of geodetic VLBI observations, the principal nutation terms caused by luni-solar tides and geophysical response have been estimated. We focuse on the variabity. Two of them present very significant amplitude and phase variations : the...
Dr
John Gipson
(NVI Inc/GSFC NASA)
14/03/2016, 17:00
4: Data Structures and Analysis Strategies in the VGOS Era
Poster Presentation
The IVS Working Group 4 developed the new format to store and exchange data obtained from geodetic VLBI observations. The new data format, vgosDb, will replace existing Mk4 databases this year. At the GSFC NASA we developed software that will implement vgosDb format and will be used routinely to convert correlator output to the new data storage format. On this poster we present the vgosDb...
Dr
Alexander Neidhardt
(Technische Universität München, Geodätisches Observatorium Wettzell)
14/03/2016, 17:00
6: VLBI Observations of Space Vehicles
Poster Presentation
The ESA Venus and Mars Express spacecrafts were observed at X-band with the Wettzell radio telescopes Wn and Wz in a framework of the assessment study of the possible contribution of the European VLBI network to the upcoming ESA deep space missions and further projects. These observations were extended to regular weekly sessions to routinely run the processing and analysis pipeline. Recorded...
Johannes Boehm
(Technische Universität Wien)
14/03/2016, 17:00
5: Geodetic and Astrometric VLBI Results
Poster Presentation
The next realisation of the International Terrestrial Reference System, the ITRF2014, is currently in preparation or under evaluation, respectively. The VLBI input to ITRF2014 is provided by the International VLBI Service for Geodesy and Astrometry (IVS) and consists of a combination of all analysis center contributions. One of these single solutions is contributed by the Vienna special...
Johannes Böhm
(Technische Universität Wien)
14/03/2016, 17:00
4: Data Structures and Analysis Strategies in the VGOS Era
Poster Presentation
The Vienna VLBI Software (VieVS) is a VLBI analysis software developed and maintained at Technische Universität Wien (TU Wien) since 2008 with contributions from groups all over the world. It is used for both academic purposes in university courses as well as for providing VLBI analysis results to the geodetic community. Written in a modular structure in Matlab, VieVS offers easy access to the...
Dr
Guangli Wang
(Shanghai Astronomical Observatory)
14/03/2016, 17:00
6: VLBI Observations of Space Vehicles
Poster Presentation
VLBI technique was used in China’s Lunar Exploration Project Since the Chang’E-1 launched in the year of 2007, after then VLBI was played an important role in the series of Chang’E missions, CE-2, CE-3 and CE-5T1, and will be continued in the future space mission. The observation network consists of Shanghai 25m&65m, Beijing 50m, Kunming 40m and Urumqi 25m radio telescopes. Up to now it still...
Mr
César GATTANO
(SYRTE - Observatoire de Paris)
14/03/2016, 17:00
5: Geodetic and Astrometric VLBI Results
Poster Presentation
Until now, the main criteria for selecting geodetic sources were based on astrometric stability and structure at 8 GHz [Fey et al., 2015]. Other physical characteristics, especially at other wave-lengths, including the optical, should also enter the selection procedure. To this aim, we propose to summarize all known physical caracteristics, thanks to the use of three different catalogs : the...
