Results 31 to 40 of about 21,511,845 (71)

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
core   +1 more source

A Modular Approach for the Design of Quadruple Ridged Flared Horn Antenna Feeds

IEEE Access
This paper presents the methodology followed for the design of a quad-ridged flared horn (QRFH) feed for the VLBI Global Observing System (VGOS) antennas.
Oscar Garcia-Perez, Felix Tercero, Alejandro Baldominos, Gabriel Gomez-Molina, Alberto Garcia-Merino, David Regajo-Rodriguez, Rocio Sanchez-Montero   +6 more
doaj   +1 more source

Optimizing VGOS observations using an SNR-based scheduling approach

Earth, Planets and Space
The geodetic and astrometric very long baseline interferometry (VLBI) community is in the process of upgrading its existing infrastructure with the VLBI Global Observing System (VGOS). The primary objective of VGOS is to substantially boost the number of
Matthias Schartner, Bill Petrachenko, Mike Titus, Hana Krásná, John Barrett, Dan Hoak, Dhiman Mondal, Ming Hui Xu, Benedikt Soja   +8 more
doaj   +1 more source

An assessment of the accuracy of the VGOS geodetic products

, 2021
American Geophysical Union (AGU) Fall Meeting, 13-17 December 2021, New OrleansThe next-generation VLBI system called VGOS (VLBI Global Observing System) is now operational.
Macmillan, Daniel S., Behrend, Dirk, Niell, Arthur E., Ruszczyk, Chester A., Corey, Brian E., Titus, Michael A., Elosegui, Pedro, Gipson, John M., Bolotin, Sergei, Barrett, John, Mondal, Dhiman   +10 more
core  

Evaluating the potential of Indian stations in augmenting the UT1−UTC precision of VGOS Intensive sessions

Earth, Planets and Space
Irregularities in the Earth’s rotation speed are quantified by the difference between Universal Time (UT1) and Coordinated Universal Time (UTC).
Arnab Laha, Matthias Schartner, Benedikt Soja, Sigrid Böhm, Hana Krásná, Nagarajan Balasubramanian, Onkar Dikshit   +6 more
doaj   +1 more source

Canadian VLBI Technology Development Center [PDF]

, 2013
The Canadian VLBI Technology Development Center (TDC) is involved in activities related to the realization of the VLBI2010 Global Observing System (VGOS)
Petrachenko, Bill
core  

Cross-polarization Gain Calibration of VGOS Antennas

Antennas of the VLBI Global Observing System (VGOS) observe dual linear polarization. Calibration of the complex gain differences between the two polarizers of each antenna is neccesary in order to form Stokes I and to maximize the signal-to-noise ratio ...
Modiri, Sadegh, Schartner, Matthias, Gonzalez Garcia, Javier, Ezequiel Albentosa, Bernhart, Simone, Böhm, Johannes; orcid:, Nothnagel, Axel Gerhard, Pérez‐Díez, Victor, Xu, Minghui, Marti-Vidal, Ivan, Savolainen, Tuomas, Varenius, Eskil; orcid:, Soja, Benedikt; orcid:, Cheung, Chi (Teddy); orcid:0000-0002-4377-0174, Jaron, Frederic Felix Daniel; orcid:   +14 more
core   +4 more sources

The Australian mixed-mode observing program

, 2022
Global geodetic VLBI is upgrading to its next-generation observing system, VGOS. This upgrade has turned out to be a process over multiple years, until VGOS reaches its full capabilities with the envisaged continuous observations.
McCallum, Lucia; orcid:, Quick, Jonathan, Rogers, Axl, Schartner, Matthias, Böhm, Johannes; orcid:, McCarthy, Tiege, McCallum, Jamie, Chin Chuan, Lim, Krásná, Hana; orcid:, Gruber, Jakob Franz; orcid:   +9 more
core   +2 more sources

Global Climate Observing System [PDF]

, 2008
Learning from the authors of the IPCC Fourth Assessment Report and its findings to help guide future strategies for climate change observations and research was the key objective of a workshop organised jointly by the Global Climate Observing System ...
Global Climate Observing System, International Geosphere-Biosphere Programme, World Climate Change Research Programme   +2 more
core  

Geodetic analysis for the Very Long Baseline Interferometry Global Observing System [PDF]

, 2016
Very Long Baseline Interferometry (VLBI) is an essential technique for space-geodesy. It realizes the International Celestial Reference Frame (ICRF) and provides a link between the Earth- and space-fixed coordinate systems by directly observing all Earth
Kareinen, Niko, Kareinen, Niko Petteri
core