Results 1 to 10 of about 37 (33)
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
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
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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
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 +1 more source
Source structure effects in VLBI Global Observing System (VGOS) observations
, 2022 VLBI Global Observing System (VGOS) is now regularly observing to produce the best geodetic VLBI data ever, with a thermal noise level of about 3 ps. However, the systematic errors due to angular structure of the radio sources are becoming prominent in these high-precision VGOS observations.
Ming Hui Xu +3 more
openaire +2 more sources
Prospective study of high geodetic resolution to future VGOS reference point determination
Geodesy and Geodynamics, 2019 The fast slewing rate and wide band of the VLBI2010 Global Observing System (VGOS) telescopes are beneficial to procure more observations and to obtain VLBI reference points (RPs) of high precisions.
Zhibin Zhang +3 more
doaj +1 more source
A Comparative Study of VTEC Estimates Derived From S/X VLBI and VGOS Observations
Space WeatherThe ionosphere, which strongly varies in time and space, is one of the largest error sources for microwave measurements, if not accounted for accurately.
Arno Rüegg +2 more
doaj +1 more source