Results 31 to 40 of about 822 (179)

Analysis on Impacts of KVN to Geodetic VLBI Network [PDF]

Journal of Astronomy and Space Sciences, 2006
KVN simulation, which is focused on evaluating the impacts of KVN to geodetic VLBI network, was performed. The KVN is under construction with three radio telescopes VLBI system for radio astronomy and space geodesy.
Jung-Ho Cho, Jong-Uk Park, Pil-Ho Park
doaj   +1 more source

Testing impact of the strategy of VLBI data analysis on the estimation of Earth Orientation Parameters and station coordinates

Reports on Geodesy and Geoinformatics, 2016
Very Long Baseline Interferometry (VLBI) is the only space geodetic technique capable to realise the Celestial Reference Frame and tie it with the Terrestrial Reference Frame.
Wielgosz Agata, Tercjak Monika, Brzeziński Aleksander   +2 more
doaj   +1 more source

The Past and Future of East Asia to Italy: Nearly Global VLBI

Galaxies, 2023
We present here the East Asia to Italy Nearly Global VLBI (EATING VLBI) project. How this project started and the evolution of the international collaboration between Korean, Japanese, and Italian researchers to study compact sources with VLBI ...
Gabriele Giovannini, Yuzhu Cui, Kazuhiro Hada, Kunwoo Yi, Hyunwook Ro, Bong Won Sohn, Mieko Takamura, Salvatore Buttaccio, Filippo D’Ammando, Marcello Giroletti, Yoshiaki Hagiwara, Motoki Kino, Evgeniya Kravchenko, Giuseppe Maccaferri, Alexey Melnikov, Kotaro Niinuma, Monica Orienti, Kiyoaki Wajima, Kazunori Akiyama, Akihiro Doi, Do-Young Byun, Tomoya Hirota, Mareki Honma, Taehyun Jung, Hideyuki Kobayashi, Shoko Koyama, Andrea Melis, Carlo Migoni, Yasuhiro Murata, Hiroshi Nagai, Satoko Sawada-Satoh, Matteo Stagni   +31 more
doaj   +1 more source

Data Handling within the International VLBI Service

Data Science Journal, 2013
The International VLBI Service for Geodesy and Astrometry (IVS) is a globally operating service that coordinates and performs Very Long Baseline Interferometry (VLBI) activities through its constituent components.
Dirk Behrend
doaj   +1 more source

A New Very Long Baseline Interferometry Method Based on the Uplink Signal

IEEE Access, 2020
Very long baseline interferometry (VLBI) is widely used for astronomical observations and navigation of deep space receivers. To solve the problems of the downlink signal being excessively weak to be received and the excessively large acquisition time, a
Linshan Xue, Weiren Wu, Xue Li
doaj   +1 more source

The Short-Arc Precise Orbit Determination of GEO Satellites Using VLBI and Transfer Ranging

Remote Sensing, 2022
It is important for a geostationary Earth orbit (GEO) satellite to rapidly recover its orbit after a maneuver with short-arc precise orbit determination (POD).
Kai Nan, Fen Cao, Jianjun Gong, Hui Lei, Zhigang Li, Xuhai Yang   +5 more
doaj   +1 more source

Favorable locations for new VGOS antennas in India depending on the assessment of geodetic parameters and environmental factors

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, Susanne Glaser, Robert Heinkelmann, Harald Schuh, Nagarajan Balasubramanian, Onkar Dikshit   +5 more
doaj   +1 more source

Decoherence in LOFAR-VLBI beamforming [PDF]

Astronomy & Astrophysics, 2020
We show that the use of a superstation (a phased array created using multiple stations of an interferometric array) created in post-processing for LOFAR-VLBI observations introduces a direction-dependent loss of signal in the image. We show this effect using simulations and real data.
Bonnassieux E., Edge A., Morabito L., Bonafede A.   +3 more
openaire   +3 more sources

A Study on the Development of Playback Control Software for Mark5B VSI System [PDF]

Journal of Astronomy and Space Sciences, 2010
We developed the playback control software for a high-speed playback system which is a component of the Korea-Japan Joint VLBI Correlator (KJJVC). The Mark5B system, which is a recorder and playback system used in the Korean VLBI Network (KVN), has two
S. J. Oh, J. H. Yeom, D. G. Roh, H. S. Chung, K. D. Kim, Roger Cappallo   +5 more
doaj   +1 more source

Software and Techniques for VLBI Data Processing and Analysis

Universe, 2022
Very-long-baseline interferometry (VLBI) is a challenging observational technique, which requires in-depth knowledge about radio telescope instrumentation, interferometry, and the handling of noisy data.
Michael Janssen, Jack F. Radcliffe, Jan Wagner   +2 more
doaj   +1 more source