Results 41 to 50 of about 15,217 (172)

An Experiment on Radio Location of Objects in the Near-Earth Space with VLBI in 2012

Open Astronomy, 2013
An experiment on radar location of space debris objects using of the method of VLBI was carried out in April, 2012. The radar VLBI experiment consisted in irradiation of some space debris objects (4 rocket stages and 5 inactive satellites) with a signal ...
Nechaeva M., Antipenko A., Bezrukovs V., Bezrukov D., Dementjev A., Dugin N., Konovalenko A., Kulishenko V., Liu X., Nabatov A., Nesteruk V., Pupillo G., Reznichenko A., Salerno E., Shmeld I., Shulga O., Sybiryakova Y., Tikhomirov Yu., Tkachenko A., Volvach A., Yang W.-J.   +20 more
doaj   +1 more source

Astrometric Apparent Motion of High-redshift Radio Sources

The Astronomical Journal, 2023
Radio-loud quasars at high redshift ( z ≥ 4) are rare objects in the universe and rarely observed with Very Long Baseline Interferometry (VLBI). But some of them have flux density sufficiently high for monitoring of their apparent position.
Oleg Titov, Sándor Frey, Alexey Melnikov, Fengchun Shu, Bo Xia, Javier González, Belén Tercero, Leonid Gurvits, Aletha de Witt, Jamie McCallum, Mikhail Kharinov, Vladimir Zimovsky, Máté Krezinger   +12 more
doaj   +1 more source

VLBI Activities in Japan and a Projected Space-VLBI Program [PDF]

Symposium - International Astronomical Union, 1988
There are three institutes in Japan that are equipped with VLBI facilities. Of these, Nobeyama Radio Observatory started VLBI experiments with astrophysical and astrometric interests. The Institute of Space and Astronautical Science, the Nobeyama Radio Observatory, and the Radio Research Laboratory collaborated with JPL and other institutions for this ...
openaire   +1 more source

VLBI astrometry on the white dwarf pulsar AR Scorpii [PDF]

, 2023
AR Scorpii (AR Sco), the only-known radio-pulsing white dwarf binary, shows unusual pulsating emission at the radio, infrared, optical, and ultraviolet bands.
Cao, Hongmin, Liu, Xiang, Jiang, Pengfei, Cui, Lang, Weston, Stuart, An, Tao, Yang, Jun, Li, Guanghui, Xia, Bo, Xu, Shuangjing, Gulyaev, Sergei, Zhang, Bo, Chen, Wen, Jiang, Wu, Shu, Fengchun, Zhang, Bo,, Chen, Wen,, Xu, Shuangjing,, Cui, Lang,, Weston, Stuart,, Liu, Xiang,, Jiang, Pengfei,, Yang, Jun,, Gulyaev, Sergei,, Xia, Bo,, Shu, Fengchun,, Cao, Hongmin,, An, Tao,, Jiang, Wu,, Li, Guanghui,, Lang Cui, Stuart Weston, Tao An, Jun Yang, Xiang Liu, Fengchun Shu, Sergei Gulyaev, Guanghui Li, Wu Jiang, Shuangjing Xu, Pengfei Jiang, Bo Xia, Bo Zhang, Wen Chen, Hongmin Cao   +44 more
core   +1 more source

Preparation of the VIRAC Radio Telescope RT-32 for e-VLBI Observations

Open Astronomy, 2013
A fully steerable parabolic antenna RT-32 with the mirror diameter 32 m owned by the Ventspils International Radio Astronomy Centre (VIRAC) is available for fundamental and applied research in radio astronomy.
Skirmante K., Bezrukovs Vl., Jekabsons N., Shmeld I.   +3 more
doaj   +1 more source

VLBI surveys [PDF]

Proceedings of 8th European VLBI Network Symposium — PoS(8thEVN), 2007
Systematic surveys of astronomical objects often lead to discoveries, but always provide invaluable information for statistical studies of well-defined samples. They also promote follow-up investigations of individual objects or classes. Surveys using a yet unexplored observing wavelength, a novel technique or a new instrument are of special importance.
openaire   +2 more sources

A Concept of Precise VLBI/GNSS Ties with Micro-VLBI

, 2023
AbstractWe 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.
Leonid Petrov, Johnathan York, Joe Skeens, Richard Ji-Cathriner, David Munton, Kyle Herrity   +5 more
openaire   +1 more source

Removing the Effect of Source Structure From Correlated VLBI Data

Radio Science, Volume 61, Issue 10, October 2026.
Abstract Recent studies suggest that in geodetic very long baseline interferometry (VLBI) the assumption of sources being point‐like results in a significant residual error introduced by the effect of source structure. Our aim is to remove the impact of source structure from geodetic VLBI data right after the correlation step. For this purpose, we have
Frédéric Jaron, Víctor Pérez‐Díez, Hana Krásná, Johannes Böhm, Patrick Charlot, Arnaud Collioud, Jakob Gruber, Iván Martí‐Vidal, Axel Nothnagel   +8 more
wiley   +1 more source

Shanghai VLBI Correlator [PDF]

, 2013
This report summarizes the activities of the Shanghai VLBI Correlator during ...
Fengchun Shu, Zhong Chen, Weimin Zheng, Zheng, Weimin, Shu, Fengchun, Chen, Zhong   +5 more
core  

Influence of the horizontal resolution of numerical weather models on ray-traced delays for VLBI analysis

, 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, Böhm, Johannes, Landskron, Daniel   +2 more
core   +2 more sources