Results 11 to 20 of about 9,054 (229)
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 +2 more sources
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
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
Rotation of Earth and determination of Earth orientation parameters [PDF]
Geodetski Glasnik, 2015 Earth's rotation and elements of the Earth's orientation, with emphasis on the determination of the parameters of the Earth's orientation were described.
Mirko Borisov +2 more
doaj +1 more source
High-fidelity wideband VLBI polarimetry
, 2023 We will discuss about wideband and multiband VLBI observations taken with linear-polarization feeds (the simplest hardware polarimetry for wide bands), and how these observations can be calibrated and fringe-fitted with special software, in order to ...
Martí-Vidal, Iván
core +1 more source
GPU-Based Parallel Implementation of VLBI Correlator for Deep Space Exploration System
Remote Sensing, 2021 Very Long Baseline Interferometry (VLBI) solution can yield accurate information of angular position, and has been successfully used in the field of deep space exploration, such as astrophysics, imaging, detector positioning, and so on.
Fan Zhang +4 more
doaj +1 more source