Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufm.g14b..06p&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #G14B-06
Astronomy and Astrophysics
Astronomy
[1241] Geodesy And Gravity / Satellite Geodesy: Technical Issues, [1243] Geodesy And Gravity / Space Geodetic Surveys, [1294] Geodesy And Gravity / Instruments And Techniques, [1295] Geodesy And Gravity / Integrations Of Techniques
Scientific paper
Very Long Baseline Interferometry (VLBI) is the unique technique for measuring the orientation of the Earth in inertial space. As such it is an essential element of the Global Geodetic Observing System (GGOS) of the International Association of Geodesy (IAG). The current geodetic VLBI network, developed mainly in the 1970's and 1980's, has achieved extraordinary success. However, a number of factors, including aging infrastructure and demanding new scientific requirements, began to challenge its future sustainability and relevance. In response, in 2003, the International VLBI Service for Geodesy and Astrometry (IVS) initiate Working Group 3 to study the requirements of a next generation geodetic VLBI system. The goals of the new system are to achieve (on global scales) 1-mm position accuracy over a 24-hour observing session, 0.1-mm/yr velocity accuracy, continuous observations, and delivery of initial results within 24-hours after taking data. The challenging nature of these goals requires a completely new technical, operational, and analytical design of VLBI measurements. Based on extensive simulation studies, strategies have been developed to improve IVS product accuracy through the use of a network of small (~12-m) fast-slewing antennas, a new method for generating high precision delay measurements, a more uniform network distribution (with emphasis on new sites in the Southern Hemisphere), and improved methods for handling biases related to system electronics, deformations of the antenna structures, and radio source structure. To test many of the proposed strategies, NASA is sponsoring a proof-of-concept development effort using IVS antennas near Washington, DC, and Boston, MA. As of August 2010, the construction of twelve new VLBI2010 sites has been funded. These will improve current netwok geometry and provide an important step towards a global VLBI2010 network. Proposals for several more radio telescopes have been submitted to the relevant funding agencies.
Behrend Dirk
Corey Brian E.
Niell Arthur E.
Petrachenko William T.
Schuh Haral
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