Results 21 to 30 of about 21,511,845 (71)

The NTSC VLBI System and its application in UT1 measurement [PDF]

, 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
core   +1 more source

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
core   +1 more source

Initial Results Obtained with the First TWIN VLBI Radio Telescope at the Geodetic Observatory Wettzell

Sensors, 2015
Geodetic Very Long Baseline Interferometry (VLBI) uses radio telescopes as sensor networks to determine Earth orientation parameters and baseline vectors between the telescopes.
Torben Schüler, Gerhard Kronschnabl, Christian Plötz, Alexander Neidhardt, Alessandra Bertarini, Simone Bernhart, Laura la Porta, Sebastian Halsig, Axel Nothnagel   +8 more
doaj   +1 more source

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
core  

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
core   +1 more source

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

Prototype System for Unmanned Reference Point Determination at the Sub‐Millimeter Level

Earth and Space Science, Volume 11, Issue 2, February 2024.
Abstract The determination of reference points for telescopes is crucial for obtaining the local‐tie vector for a multi‐technology co‐located station. Traditional methods suffer from labor‐intensive fieldwork, long execution cycles, and systematic errors due to the incident angle of the total station's laser beam on the prism. In this paper, we propose
Zhibin Zhang, Zhikang Wang, Xiaohui Ma, Zhengxiong Sun, Dezhen Xu, Chengli Huang, Guangli Wang, Zhaoxiang Qi   +7 more
wiley   +1 more source

First proof of concept of remote attendance for future observation strategies between Wettzell (Germany) and Concepción (Chile) [PDF]

, 2010
Current VLBI observations are controlled and attended locally at the radio telescopes on the basis of pre-scheduled session files. Operations have to deal with system specific station commands and individual setup procedures.
Hase, H, Oñate, E, Zaror, P, Ettl, Martin, Mühlbauer, M, Dassing, R, Herrera, C, Neidhardt, Alexander, Sobarzo, S, Plötz, C   +9 more
core  

Proceedings of the 25th European VLBI Group for Geodesy and Astrometry Working Meeting

, 2021
Spectrum management for the VLBI Global Observing System (VGOS) is an important task to keep radio frequency interference as absent as possible from observation sites.
M. Lindqvist, H. Hase, V. Tornatore, M. Bautista-Duran, W. Madkour, B. Winkel, J. A. Lopez-Perez, J. Kallunki, P. Kupiszewski   +8 more
core