100 research outputs found
The NTSC VLBI System and its application in UT1 measurement
In order to measure the Universal Time (UT1) in real time, National Time
Service Center (NTSC) has built a VGOS-like (VLBI Global Observing System)
broadband VLBI network, which includes three 13-m radio telescopes located in
Jilin, Sanya and Kashi, and a data analysis center in Xi'an. Each station is
equipped with a highly stable hydrogen atomic clock and a self-developed VLBI
backend, and is co-located with two GPS receivers. This VGOS-like VLBI network
may play an important role in improving the Chinese broadband VLBI technology
and making valuable contributions to domestic VLBI measurements of UT1. In this
paper, we introduce the specifications of this VLBI network, and present the
UT1 measurements at C-band conducted in 2018 using the Jilin-Kashi baseline of
this network. The comparisons between our UT1 estimates and those provided by
IERS suggest that the NTSC VLBI network is capable to determine UT1 accurate at
the level of 58.8 microseconds
International VLBI Service for Geodesy and Astrometry 2014 Annual Report
IVS is an international collaboration of organizations which operate or support Very Long Baseline Interferometry (VLBI) components. The goals are: 1. To provide a service to support geodetic, geophysical and astrometric research and operational activities. 2. To promote research and development activities in all aspects of the geodetic and astrometric VLBI technique. 3. To interact with the community of users of VLBI products and to integrate VLBI into a global Earth observing system
International VLBI Service for Geodesy and Astrometry 2012 Annual Report
This volume of reports is the 2012 Annual Report of the International VLBI Service for Geodesy and Astrometry (IVS). The individual reports were contributed by VLBI groups in the international geodetic and astrometric community who constitute the permanent components of IVS. The IVS 2012 Annual Report documents the work of the IVS components for the calendar year 2012, our fourteenth year of existence. The reports describe changes, activities, and progress ofthe IVS. Many thanks to all IVS components who contributed to this Annual Report. With the exception of the first section and parts of the last section (described below), the contents of this Annual Report also appear on the IVS Web site athttp:ivscc.gsfc.nasa.gov/publications/ar201
International VLBI Service for Geodesy and Astrometry 2008 Annual Report
This volume of reports is the 2008 Annual Report of the International VLBI Service for Geodesy and Astrometry (IVS). The individual reports were contributed by VLBI groups in the international geodetic and astrometric community who constitute the components of IVS. The 2008 Annual Report documents the work of these IVS components over the period January 1, 2008 through December 31, 2008. The reports document changes, activities, and progress of the IVS. The entire contents of this Annual Report also appear on the IVS Web site at http://ivscc.gsfc.nasa.gov/publications/ar2008
Proceedings of the Sixth General Meeting of the International VLBI Service for Geodesy and Astrometry
This volume is the proceedings of the sixth General Meeting of the International VLBI Service for Geodesy and Astrometry (IVS), held in Hobart, Tasmania, Australia, February 7-13, 2010. The contents of this volume also appear on the IVS Web site at http://ivscc.gsfc.nasa.gov/publications/gm2010. The keynote of the sixth GM was the new perspectives of the next generation VLBI system under the theme "VLBI2010: From Vision to Reality". The goal of the meeting was to provide an interesting and informative program for a wide cross-section of IVS members, including station operators, program managers, and analysts. This volume contains 88 papers. All papers were edited by the editors for usage of the English language, form, and minor content-related issues
National Report for the IAG of the IUGG 2019-2022
Major results of researches conducted by Russian geodesists in 2019-2022 on
the topics of the International Association of Geodesy (IAG) of the
International Union of Geodesy and Geophysics (IUGG) are presented in this
issue. This report is prepared by the Section of Geodesy of the National
Geophysical Committee of Russia. In the report prepared for the XXVII General
Assembly of IUGG (Germany, Berlin, 11-20 July 2023), the results of principal
researches in geodesy, geodynamics, gravimetry, in the studies of geodetic
reference frame creation and development, Earth's shape and gravity field,
Earth's rotation, geodetic theory, its application and some other directions
are briefly described. For some objective reasons not all results obtained by
Russian scientists on the field of geodesy are included in the report.Comment: Misprint in the title of the arXiv record has been corrected. The
submission content is not affecte
International VLBI Service for Geodesy and Astrometry 2011 Annual Report
This volume of reports is the 2011 Annual Report of the International VLBI Service for Geodesy and Astrometry (IVS). The individual reports were contributed by VLBI groups in the international geodetic and astrometric community who constitute the components of IVS. The 2011 Annual Report documents the work of these IVS components over the period January 1, 2011 through December 31, 2011. The reports document changes, activities, and progress of the IVS. The entire contents of this Annual Report also appear on the IVS Web site at http://ivscc.gsfc.nasa.gov/publications/ar2011
International VLBI Service for Geodesy and Astrometry 2013 Annual Report
This volume of reports is the 2013 Annual Report of the International VLBI Service for Geodesy and Astrometry (IVS). The individual reports were contributed by VLBI groups in the international geodetic and astrometric community who constitute the permanent components of IVS. The IVS 2013 Annual Report documents the work of the IVS components for the calendar year 2013, our fifteenth year of existence. The reports describe changes, activities, and progress of the IVS. Many thanks to all IVS components who contributed to this Annual Report. With the exception of the first section and the last section, the contents of this Annual Report also appear on the IVS Web site at http://ivscc.gsfc.nasa.gov/publications/ar2013
The Italian VLBI Network: First Results and Future Perspectives
A first 24-hour Italian VLBI geodetic experiment, involving the Medicina, Noto, and Matera antennas, shaped as an IVS standard EUROPE, was successfully performed. In 2014, starting from the correlator output, a geodetic database was created and a typical solution of a small network was achieved, here presented. From this promising result we have planned new observations in 2016, involving the three Italian geodetic antennas. This could be the beginning of a possible routine activity, creating a data set that can be combined with GNSS observations to contribute to the National Geodetic Reference Datum. Particular care should be taken in the scheduling of the new experiments in order to optimize the number of usable observations. These observations can be used to study and plan future experiments in which the time and frequency standards can be given by an optical fiber link, thus having a common clock at different VLBI stations
International Research Infrastructure Landscape 2019 : A European Perspective
The report is the final product of the RISCAPE project, funded by the European Commission H2020 programme
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