Results 21 to 30 of about 14,980 (205)
Space Weather, 2021 Geodetic very long baseline interferometry (VLBI) observations are carried out, with the legacy system, using two well‐separated frequency bands in order to determine first‐order ionospheric delay corrections corresponding to the combined effect of total
Hossein Etemadfard +3 more
doaj +1 more source
, 1991 VSOP-to-ground VLBI and mm VLBI are both needed if we want to further increase our knowledge of quasars, radio galaxies and their radio jets, mm VLBI will be a better instrument to study the "central engine" while satellite VLBI will better show the ...
Bååth, L.B.,
core +8 more sources
Global Geodetic Observing System 2015–2018 [PDF]
Geodesy and Cartography, 2019 Global Geodetic Observing System (GGOS) was established in 2003 by the International Association of Geodesy (IAG) with the main goal to deepen understanding of the dynamic Earth system by quantifying human-induced Earth’s changes in space and time.
Krzysztof Sośnica, Jarosław Bosy
doaj +1 more source
Galaxies, 2022 The East Asian VLBI Network (EAVN) is an international VLBI facility in East Asia and is operated under mutual collaboration between East Asian countries, as well as part of Southeast Asian and European countries.
Kazunori Akiyama +104 more
doaj +1 more source
Precise VLBI/GNSS ties with micro-VLBI
, 2023 We present here a concept of measuring local ties between collocated GNSS and VLBI stations using the microwave technique that effectively transforms a GNSS receiver to an element of a VLBI network. This is achieved by modifying the signal chain that allows to transfer voltage of the GNSS antenna to a digitizer via a coaxial cable.
Petrov, Leonid +5 more
openaire +2 more sources
Ray tracing-based delay model for compensating gravitational deformations of VLBI radio telescopes
Journal of Geodetic Science, 2022 The precision and the reliability of very long baseline interferometry (VLBI) depend on several factors. Apart from fabrication discrepancies or meteorological effects, gravity-induced deformations of the receiving unit of VLBI radio telescopes are ...
Lösler Michael +6 more
doaj +1 more source
, 2023 Over the past years VLBI data processing in CASA has become a reality. It is now a supported alternative to AIPS for EVN continuum observations and has established itself as one of the two official calibration pipelines for the EHT.
Kettenis, Mark
core +1 more source
No need for special VLBI hardware?
, 2023 Apart from the VLBA, all other VLBI networks around the world utilise radio telescopes (single dishes or arrays) built and operated as single instruments.
Tzioumis, Anastasios
core +1 more source
, 2015 Ray-traced delays offer the opportunity to correct the influences of the troposphere on observations of space geodetic applications such as Very Long Baseline Interferometry (VLBI).
Hofmeister, Armin +2 more
core +4 more sources
Comparison of VLBI and GNSS common view for time transfer
International Journal of Metrology and Quality Engineering, 2019 With the rapid development of optical clock, the stability and system uncertainty of optical clocks has reached a 1.0e–18 level. Optical clocks will likely constitute the next generation of time-frequency standards for redefining the SI second.
Wang Pingli +4 more
doaj +1 more source