Results 21 to 30 of about 160 (88)

The Vienna VLBI raw data simulator and correlator in the VGOS era [PDF]

, 2022
Die Very Long Baseline Interferometry (VLBI) ist ein Verfahren, bei der weltweit verteilte Radioteleskope eingesetzt werden, um die elektromagnetischen Feldstärken von natürlichen Radiosignalen von kosmischen Quellen zu messen.
Gruber, Jakob Franz; orcid:
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Impact of the image alignment over frequency for the VLBI Global Observing System

, 2022
Aims. The VLBI Global Observing System (VGOS), which is the next generation of geodetic very long baseline interferometry (VLBI), observes simultaneously in four frequency bands in the range 3.0-10.7 GHz (expected to be extended to 14 GHz).
Xu, Ming H., Kareinen, Niko, Savolainen, Tuomas, Zubko, Nataliya, Schuh, Harald, Anderson, James M., Lunz, Susanne   +6 more
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Impacts of the image alignment over frequency for VLBI Global Observing System

, 2021
The VLBI Global Observing System, which is the next generation of geodetic VLBI and is called VGOS, observes simultaneously at four frequency bands in the range 3.0--10.7 GHz (expected to be extended to 14 GHz).
Xu, Ming H., Anderson, James M, Harald Schuh, Schuh, Harald, Tuomas Savolainen, Nataliya Zubko, Xu, Ming H, Kareinen, Niko, Savolainen, Tuomas, Zubko, Nataliya, James M. Anderson, Susanne Lunz, Niko Kareinen, Anderson, James M., Lunz, Susanne, Ming H. Xu   +15 more
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Radiometry performance of the VGOS receivers of the Onsala twin telescopes [PDF]

, 2023
With the introduction of the VLBI Global Observing System (VGOS) the parallel use of the VGOS receiver asradiometer in order to estimate the wet propagation delay was recognised as a future possibility.
Forkman, Peter, Haas, R\ufcdiger, Haas, Rüdiger, Haas, Rüdiger,, Elgered, Gunnar, Varenius, Eskil, Elgered, Gunnar,, Varenius, Eskil,, Forkman, Peter,   +8 more
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Geodetic data analysis of VGOS experiments

, 2021
Very Long Baseline Interferometry (VLBI) serves as one of the common geodetic methods to define the global reference frames and monitor Earth\u27s orientation variations. The technical upgrade of the VLBI method known as the VLBI Global Observing System (
Mueskens, Arno,, Lovhoiden, Laila, Anderson, J. M., Melnikov, Alexey, Gruber, J., Rottmann, H., Alexander Neidhardt, Anastasiia Girdiuk, Flohrer, Claudia, Yngvild L. Andalsvik, Daniela Thaller, Bohm, Johannes, Hohlneicher, Martin, Frederic Jaron, Szomoru, Arpad, Thaller, Daniela,, Zubko, Nataliya, Haas, Rüdiger,, Marti-Vidal, Ivan,, Schuh, Harald, Leonid Petrov, Nataliya Zubko, Helge Rottmann, Petrov, L., Choi, Yoon Kyung,, Schuh, Harald,, Xu, Minghui, Matthias Schartner, Savolainen, Tuomas, Pl\uf6tz, C., Vicente, P. de, Rottmann, H.,, Jaron, Fr\ue9d\ue9ric, Walter Alef, Girdiuk, Anastasiia,, Gerald Engelhardt, Flohrer, Claudia,, Haas, Rüdiger, Dieter Ullrich, Melnikov, Alexey,, Hammargren, Roger,, Christian Plotz, Lovhoiden, Laila,, Vicente, P. de,, Marti-Vidal, Ivan, Claudia Flohrer, Andalsvik, Yngvild L., Ivan Marti-Vidal, James M. Anderson, Gruber, J.,, Kareinen, Niko Petteri, Small, Des, Jenie, Okky S., Bernhart, Simone,, Harald Schuh, Pablo De Vicente, Girdiuk, Anastasiia, Alexey Melnikov, Gruber, Jakob, Okky S. Jenie, Javier Gonzalez, Simone Bernhart, Neidhardt, Alexander, Verkouter, Harro, Bohm, Johannes,, Plötz, Christian, Petrov, Leonid,, Müskens, Arno, Rudiger Haas, Choi, Yoon Kyung, De Vicente, Pablo, Jaron, Frédéric,, Arno Mueskens, Ullrich, DIeter, Johannes Boumann, Johannes Bohm, Xu, Minghui,, Rottmann, Helge, Andalsvik, Yngvild L.,, Tuomas Savolainen, Colomer, Francisco, Boumann, Johannes,, Yoon Kyung Choi, Laila Lovhoiden, Engelhardt, G.,, Ullrich, DIeter,, Wagner, Jan,, Axel Nothnagel, Martinez, Elena, Jenie, Okky S.,, Anderson, J. M.,, Martinez, Elena,, Jan Wagner, Andalsvik, Yngvild Linea, Schartner, Matthias,, Schueler, Torben, Schueler, Torben,, Savolainen, T.,, Wagner, Jan, Varenius, Eskil, Szomoru, A,, Torben Schueler, Elena Martinez, Kareinen, Niko Petteri,, Bernhart, Simone, Alef, Walter,, Harro Verkouter, LØvhØiden, Laila, Jaron, Frederic, Zubko, Nataliya,, Eskil Varenius, Roger Hammargren, Thaller, Daniela, Minghui Xu, Kareinen, Niko, Haas, R\ufcdiger, Gonzalez, Javier, Engelhardt, G., Mueskens, Arno, Plötz, C.,, Martin Hohlneicher, Hammargren, Roger, Engelhardt, Gerald, Schartner, Matthias, Verkouter, Harro,, Nothnagel, Axel,, Small, Des,, Boumann, Johannes, Nothnagel, Axel, Petrov, Leonid, Arpad Szomoru, Des Small, Schüler, Torben, Colomer, Francisco,, Neidhardt, Alexander,, Francisco Colomer, Savolainen, T., Jakob Franz Gruber, Alef, Walter, Anderson, James, Niko Kareinen, Szomoru, A, Hohlneicher, Martin,, Varenius, Eskil,, Gonzalez, Javier,, Gonzales, Javier   +145 more
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The NTSC VLBI System and its application in UT1 measurement

, 2023
In order to measure the Universal Time (UT1) in real time, National Time Service Center (NTSC) has built a VGOS-like (VLBI Global Observing System) broadband VLBI network, which includes three 13-m radio telescopes located in Jilin, Sanya and Kashi, and ...
Wu, Yuan-Wei, Yang, Ying, Zhang, Bo, Yang, Xu-Hai, Yao, Dang, Sun, Jing, Ma, Lang-Ming, Xu, Shuang-Jing, Liu, Jia, Sun, Yan, Gong, Jian-Jun   +10 more
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The Potential for Unifying Global‐Scale Satellite Measurements of Ground Displacements Using Radio Telescopes

Geophysical Research Letters, Volume 46, Issue 21, Page 11841-11849, 16 November 2019., 2019
Abstract The expansion of globally consistent satellite‐radar imagery presents new opportunities to measure Earth‐surface displacements on intercontinental scales. Yet global applications, including a complete assessment of the land contribution to relative sea‐level rise, first demand new solutions to unify relative satellite‐radar observations in a ...
A. L. Parker, L. McCallum, W. E. Featherstone, J. N. McCallum, R. Haas   +4 more
wiley   +1 more source

Realization Status of the VLBI Global Observing System

, 2021
American Geophysical Union (AGU) Fall Meeting, 13-17 December 2021, New OrleansThe International VLBI Service for Geodesy and Astrometry (IVS) currently employs a two-band VLBI system (legacy S/X system) as its operational system for product creation ...
Macmillan, Daniel S., Behrend, Dirk, Ruszczyk, Chester A., Gipson, John M., Elosegui, Pedro   +4 more
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Gravitational deformation of ring-focus antennas for VGOS: first investigations at the Onsala twin telescopes project [PDF]

, 2019
The receiving properties of radio telescopes used in geodetic and astrometric very long baseline interferometry (VLBI) depend on the surface quality and stability of the main reflector.
Lösler, Michael,, Eschelbach, Cornelia,, Greiwe, Ansgar,, Haas, R\ufcdiger, L\uf6sler, Michael, Haas, Rüdiger,, Eschelbach, Cornelia, Greiwe, Ansgar   +7 more
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Cross‐Polarization Gain Calibration of Linearly Polarized VLBI Antennas by Observations of 4C 39.25

Radio Science, Volume 59, Issue 4, April 2024.
Abstract Radio telescopes with dual linearly polarized feeds regularly participate in Very Long Baseline Interferometry. One example is the VLBI Global Observing System (VGOS), which is employed for high‐precision geodesy and astrometry. In order to achieve the maximum signal‐to‐noise ratio, the visibilities of all four polarization products are ...
F. Jaron, I. Martí‐Vidal, M. Schartner, J. González‐García, E. Albentosa‐Ruiz, S. Bernhart, J. Böhm, J. Gruber, S. Modiri, A. Nothnagel, V. Pérez‐Díez, T. Savolainen, B. Soja, E. Varenius, M. H. Xu   +14 more
wiley   +1 more source