Physics
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.4577c&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 90, May 10, 1985, p. 4577-4587.
Physics
75
Geodetic Surveys, Radio Interferometers, Tectonics, Very Long Base Interferometry, Block Diagrams, Data Acquisition, Nutation
Scientific paper
A National Geodetic Survey (NGS) review of candidate technologies in 1977 came to the conclusion that very long baseline interferometry (VLBI) using the MARK III system was suited for developing a modern polar motion and UT1 monitoring service. Project POLARIS (Polar-Motion Analysis by Radio Interferometric Surveying) was implemented jointly by the NGS, NASA, and the U.S. Naval Observatory (USNO). Three permanent geodetic VLBI observatories were developed in the U.S., while West Germany constructed a dedicated geodetic VLBI observatory in Wettzell, Bavaria. Agencies in the two countries jointly initiated project IRIS (International Radio Interferometric Surveying) in 1982 with the objective to exploit the improved capabilities of the combined POLARIS/Wettzell network. Attention is given to aspects of VLBI, polar motion and UT1 time series, baseline length measurements, source coordinates, nutation, frequency standard evaluation, and relativistic deflection.
Carter William E.
Mackay J. R.
Robertson Douglas S.
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