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Geodesy by very long base line interferometry
Author(s) -
Counselman C. C.
Publication year - 1975
Publication title -
reviews of geophysics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 8.087
H-Index - 156
eISSN - 1944-9208
pISSN - 8755-1209
DOI - 10.1029/rg013i003p00270
Subject(s) - very long baseline interferometry , astrometry , geodesy , polar motion , geodetic datum , universal time , interferometry , geology , base (topology) , remote sensing , astronomy , physics , earth's rotation , mathematics , stars , mathematical analysis
Important advances were made between 1971 and 1974 in the development of very long base line interferometry (VLBI) techniques for precision geodesy, including repeated determinations of the length of a transcontinental base line within 5 parts in 10 8 , accurate measurements of polar motion and the variation of universal time, and the establishment of a catalog of extragalactic radio sources with positional uncertainties smaller than 0.1 arc sec. An introduction to VLBI and an account of its early development have been given by Cohen [1973]. Counselman [1973] has reviewed applications of VLBI to geodesy and astrometry prior to 1973, and recently, Moran [1975 a ] has described the geodetic and astrometric results which have been obtained by VLBI through June 1974. Moran's review is particularly timely because he discusses important unpublished data, preliminary results, and work now in progress or being planned by the major VLBI groups in the United States.