Results 171 to 180 of about 14,980 (205)

VLBI in transition

SPIE Proceedings, 2006
European VLBI is undergoing a rapid development. On one hand electronic or e-VLBI is changing the very nature of the European VLBI Network (EVN), on the other hand a dramatically increased time resolution will enable the EVN to image vast areas of sky at unprecedented resolution.
Arpad Szomoru, Huib Jan van Langevelde, Harro Verkouter, Mark Kettenis, Bauke Kramer, Friso Olnon, James Anderson, Cormac Reynolds, Zsolt Paragi, Mike Garrett   +9 more
openaire   +1 more source

Orbit determination of geosynchronous satellites by VLBI and differential VLBI

Astrodynamics Conference, 1982
Four approaches to radio interferometric tracking of geosynchronous satellites are analyzed and compared. Quasar-based differential very-long-baseline interferometry, which requires a very sensitive receiver, can achieve meter-level position accuracy with a two-baseline system.
T. YUNCK, S. WU
openaire   +1 more source

VLBI in the 1990s

Publications of the Astronomical Society of Australia, 1990
Abstract Radio telescopes in more than 20 different countries on five continents are being used for VLBI observations of galactic and extragalactic radio sources, as well for applications to geodesy and geophysics. New radio telescopes and networks of radio telescopes dedicated to VLBI which are being built in the United States, the U.S.S.R.
openaire   +1 more source

Climatic signals observed by VLBI

Acta Geodaetica et Geophysica Hungarica, 2006
VLBI observations at various stations all over the globe have been carried out since the beginning of the eighties. As VLBI allows to determine tropospheric parameters such as hydrostatic and wet zenith path delays stable and long time series of these parameters exist that can be used for climatological studies.
Schuh, H., Panafidina, N., Böhm, J., Heinkelmann, R.   +3 more
openaire   +3 more sources

Introduction to VLBI

1989
The principles of Very Long Baseline Interferometry are essentially the same as those in connected-element interferometry. Both systems can be used to make images of extended radio sources through the application of various calibration and image restoration techniques or to measure geometric quantities such as the positions of point sources or baseline
openaire   +1 more source

Future directions of space VLBI: International VLBI Satellite (IVS)

Advances in Space Research, 1991
Abstract Future space VLBI missions will explore new dimensions in angular resolution, sensitivity, frequency range and image quality. The International VLBI Satellite (IVS), currently under assessment by ESA and the Soviet Academy of Sciences, proposes to make significant advances in all these parameters compared with the first generation missions ...
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The Japanese VLBI project VERA (VLBI for the Earth rotation study and astrometry)

Vistas in Astronomy, 1988
Abstract A brief description is made for the aims and specific features of a planned VLBI project “VLBI for the Earth Rotation study and Astrometry” (VERA).
T. Hara, I. Okamoto, T. Sasao
openaire   +1 more source

Progress in VLBI at Shanghai Observatory

1988 Conference on Precision Electromagnetic Measurements, 1988
An overview is presented of recent developments on very-long-baseline interferometry (VLBI) at the Shanghai Observatory. The Shanghai Radio Station, which is equipped with a 25-m antenna, and other facilities that became operational in 1988, are described. The VLBI data-processing system is discussed. It includes an S-2 VLBI data processor and a series
openaire   +1 more source

Improving VLBI analysis by tropospheric ties in GNSS and VLBI integrated processing

Journal of Geodesy, 2022
Harald Schuh, Maorong Ge, Susanne Glaser
exaly  

Optimizing schedules for the VLBI global observing system

Journal of Geodesy, 2020
Matthias Schartner, Johannes Böhm
exaly