Results 1 to 10 of about 339 (91)
A Tri-Band Cooled Receiver for Geodetic VLBI [PDF]
Sensors, 2021 This paper shows a simultaneous tri-band (S: 2.2–2.7 GHz, X: 7.5–9 GHz and Ka: 28–33 GHz) low-noise cryogenic receiver for geodetic Very Long Baseline Interferometry (geo-VLBI) which has been developed at Yebes Observatory laboratories in Spain.
José A. López-Pérez +16 more
doaj +2 more sources
New Cable Delay Measurement System for VGOS Stations [PDF]
Sensors, 2022 This paper presents the new cable delay measurement system (CDMS) designed at Yebes Observatory (IGN, Spain), which is required for the VLBI Global Observing System (VGOS) stations.
Pablo García-Carreño +6 more
doaj +2 more sources
Observing UT1-UTC with VGOS [PDF]
Earth, Planets and Space, 2021 We present first results for the determination of UT1-UTC using the VLBI Global Observing System (VGOS). During December 2019 through February 2020, a series of 1 h long observing sessions were performed using the VGOS stations at Ishioka in Japan and ...
Rüdiger Haas +3 more
doaj +3 more sources
Optimal antenna locations of the VLBI Global Observing System for the estimation of Earth orientation parameters [PDF]
Earth, Planets and Space, 2020 To support monitoring subtle effects in the Earth system such as a mean sea level rise of 3 mm/year, a next-generation VLBI system, the VLBI Global Observing System (VGOS), has been developed and a new VGOS station network is being built.
Matthias Schartner +2 more
doaj +2 more sources
Inter-Comparison of UT1-UTC from 24-Hour, Intensives, and VGOS Sessions during CONT17. [PDF]
Sensors (Basel), 2022 This work focuses on the assessment of UT1-UTC estimates from various types of sessions during the CONT17 campaign. We chose the CONT17 campaign as it provides 15 days of continuous, high-quality VLBI data from two legacy networks (S/X band), i.e ...
Raut S +5 more
europepmc +4 more sources
The AUSTRAL VLBI observing program. [PDF]
J Geod, 2017 The AUSTRAL observing program was started in 2011, performing geodetic and astrometric very long baseline interferometry (VLBI) sessions using the new Australian AuScope VLBI antennas at Hobart, Katherine, and Yarragadee, with contribution from the ...
Plank L +12 more
europepmc +3 more sources
Short-baseline interferometry local-tie experiments at the Onsala Space Observatory. [PDF]
J Geod, 2021 We present results from observation, correlation and analysis of interferometric measurements between the three geodetic very long baseline interferometry (VLBI) stations at the Onsala Space Observatory.
Varenius E, Haas R, Nilsson T.
europepmc +4 more sources
Initial Results Obtained with the First TWIN VLBI Radio Telescope at the Geodetic Observatory Wettzell [PDF]
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 +8 more
doaj +2 more sources
Unconstrained Estimation of VLBI Global Observing System Station Coordinates [PDF]
Advances in Geosciences, 2021 The International VLBI Service for Geodesy and Astrometry (IVS) is currently setting up a network of smaller and thus faster radio telescopes observing at broader bandwidths for improved determination of geodetic parameters. However, this new VLBI Global
M. Mikschi +3 more
doaj +1 more source
Earth, Planets and Space, 2023 VLBI simulation studies are carried out to investigate the impact of any proposed station or strategy on the geodetic parameters, such as Earth Orientation Parameters (EOP) and Terrestrial Reference Frame (TRF). In general, such studies are performed for
Sujata Dhar +5 more
doaj +1 more source