Event calendar file
28-29 October 2021
TU Wien Freihaus
Europe/Vienna timezone
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Contribution List
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29
In this talk we report on the present status of the VGOS radio-telescope at Yebes and future plans.
Presented by Mr. Javier GONZÁLEZ-GARCÍA
on
28 Oct 2021
at
09:45
In this talk I will first review the results presented at the EVGA 2021; the short-baseline interferometry sessions carried out at X-band with VGOS antennas Oe and Ow plus the legacy S/X antenna On. Then I will present additional data taken recently, and discuss some open questions.
Presented by Dr. Eskil VARENIUS
on
29 Oct 2021
at
10:45
We present the results from the analysis of EU-VGOS sessions using two different software packages. Various aspects are compared and discussed.
Presented by Prof. Rüdiger HAAS
on
29 Oct 2021
at
09:15
In 2020 eleven EU-VGOS session were observed with particularly short integration times. Initially the main purpose of these sessions was to test how short VGOS scans can be in practice. Our aim was to investigate the suitability of these sessions for a regular geodetic analysis and an assessment of the quality of the results. We used the Vienna VLBI and Satellite Software (VieVS) for the analysis
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Presented by Olivia PANZENBÖCK
on
29 Oct 2021
at
09:00
VGOS data are observed and recorded in dual linear polarization. During the fringe-fitting process these two polarization directions have to be combined to Stokes I, taking into account the parallactic angle. Before the visibilites can be coherently added, the cross-polarization complex gains for each telescope have to be determined in a calibration step. In this talk I show how PolConvert can be
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Presented by Dr. Frederic JARON
on
28 Oct 2021
at
15:45
We will give a brief overview on the current status of correlated EU-VGOS sessions as well as an update on the e-transfer capabilities at the Bonn correlator.
Presented by Simone BERNHART
on
28 Oct 2021
at
14:00
The phase calibration reference signal of a VLBI station is carried by a cable from the maser in the control room to the phase calibration signal generator at the antenna room. Any changes in the length of the cable also introduce delays in the phase calibration signal. The phase calibration correction is applied at the fringe-fitting stage; therefore, the instrumental delays from the injection po
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Presented by Jakob GRUBER
on
29 Oct 2021
at
10:30
In order to characterize VGOS antenna we have developed
a concept of single dish experiment (SDE) and software
that supports it. I will provide an overview of this
activity and share results.
Presented by Petrov LEONID
on
28 Oct 2021
at
10:30
In the talk, we will report the comparison of single band databases of each four bands both at the observable level and for the geodetic results. The results based on closure analysis of the broadband observables will also be reported and compared for different calibration and fringe fitting strategies used for the available EU-VGOS observations.
Presented by Dr. Ming Hui XU
on
29 Oct 2021
at
10:15
Within this presentation, we will give a brief overview of the development status of the VLBI scheduling software VieSched++ as well as show our future plans. The last bigger update was published end of April and was related to integrating satellite observations. Since then, development has focused on smaller bug fixes and increased automation for operational use.
The next bigger update is plann
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Presented by Matthias SCHARTNER
on
29 Oct 2021
at
14:00
In order to achieve the VGOS goals, the correlator capacity will have to be scaled up significantly. Given the fact that CPU clock speeds have not increased significantly over the last decade, the only way to achieve this is by parallelizing the workload. The most efficient way to do this is by eliminating dependencies between parallel tasks as much as possible. In this contribution I will disc
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Presented by Dr. Mark KETTENIS
on
28 Oct 2021
at
15:15
I will present lessons learned from 32 Gbps and 64 Gbps test observations carried out with the Oe and Ow antennas. I will discuss details in how to set up DBBC3 backend and flexbuff recorder for such datarates, and discuss possible near-future changes and/or upgrades.
Presented by Dr. Eskil VARENIUS
on
28 Oct 2021
at
11:00
In this talk I will present some preliminary results on fringe-tests done with the Oe-Ow baseline at frequencies above the usual VGOS band D. I will discuss what changes are needed compared to our "standard" VGOS system, and some ideas for how to deal with potential issues such as faint PCAL at high frequencies.
Presented by Dr. Eskil VARENIUS
on
29 Oct 2021
at
13:30
I will present results from a recent campaign to measure quasar flux densities using the single ONSA13SW (Ow) and ONSA13NE (Oe) 75m baseline. During 2021 we conducted more than 60 short (20m) experiments in order to measure flux densities of a few bright sources. The aims were to a) check and monitor the Oe and Ow RF stability in the long and short term, b) assess the feasibility of doing regular
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Presented by Dr. Eskil VARENIUS
on
29 Oct 2021
at
13:45
Within this presentation, we will give an overview of the short integration time sessions observed in 2020 as a base for discussions about appropriate analysis strategies and potential scientific results.
In total, there have been eleven sessions out of which five are correlated and ready for analysis.
The sessions were designed for testing the performance of the shorter scan durations for VG
... More
Presented by Matthias SCHARTNER
on
29 Oct 2021
at
09:45
The calibration and imaging of VLBI observations in circular polarization basis is preferred, since the parallactic-angle correction reduced to a simple deterministic phase correction that commutes with all antenna-gain corrections. Circular polarization has indeed been the polarimetry basis in classical VLBI observations. Hence, conversion of the linear-polarization VGOS visibilities into a pure
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Presented by Dr. Ivan MARTI-VIDAL, JAVIER GONZALEZ GARCIA
on
28 Oct 2021
at
16:00
We present updates and progress on the VGOS project in Finland, the current status and plans.
Presented by Dr. Nataliya ZUBKO
on
28 Oct 2021
at
09:00
I will summarise recent, current and planned activities at the Onsala VGOS correlator. I will note some open questions and challenges that may be shared by others.
Presented by Dr. Eskil VARENIUS
on
28 Oct 2021
at
14:15
I will present the current status of the two VGOS antennas ONSA13NE (Oe) and ONSA13SW (Ow), located at Onsala Space Observatory in Sweden. I will note recent improvements and changes, and summarise known challenges as well as and future plans for changes and upgrades.
Presented by Dr. Eskil VARENIUS
on
28 Oct 2021
at
09:15
While the SFXC correlator at JIVE is (currently) not a VGOS correlator, it has in recent years gained the capability to function as a geodetic correlator. This functionality has been successfully used to refine the positions of some of the EVN stations that don't
take part in geodetic observation on a regular basis. The aim is also for SFXC to be able to correlate VGOS data. In this contributi
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Presented by Dr. Mark KETTENIS
on
28 Oct 2021
at
15:30
I'll give an introduction to the new etc/etd VLBI data transfer software. The software is intended to replace e.g. m5copy, and provides significantly faster data transfer rates for "multi-file" recordings, normally used within (EU)VGOS.
Presented by Dr. Eskil VARENIUS
on
28 Oct 2021
at
11:15
Session:
Analysis I (Short-scan sessions)
Presented by Dr. Anastasiia GIRDIUK
on
29 Oct 2021
at
09:30
Yebes Observatory is about to develop a web server for the analysis and visualization of calibration data obtained during the EU-VGOS interferometric observations. For this, the first task will consist of the design and development of a database that contains the calibration information extracted from the Field System log files available on-line from the various radio telescopes that participate i
... More
Presented by Cristina GARCIA-MIRO
on
28 Oct 2021
at
10:45
We give a status report of the Vienna Correlator and its capabilities to correlate EU-VGOS sessions. We will also include information about our network connection.
Presented by Dr. Frederic JARON
on
28 Oct 2021
at
14:30
Geodetic Observatory Wettzell: Current status of the newly established VLBI correlator facility.
Presented by Mr. Christian PLÖTZ
on
28 Oct 2021
at
14:45
Geodetic Observatory Wettzell: Current status of the Twin radio telescope Wettzell south (Ws).
Presented by Mr. Christian PLÖTZ
on
28 Oct 2021
at
09:30
