Mathematics – Logic
Scientific paper
Sep 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994itn....16d..21f&link_type=abstract
Results from the SEARCH'92 Campaign. (IERS Technical Note ; 16), Edited by J.O. Dickey and M. Feissel. Paris: Central Bureau of
Mathematics
Logic
Scientific paper
Earth rotation data were obtained with GPS during the Epoch '92 campaign in the summer of 1992. About 10 days of data were acquired from 25 globally distributed stations and a constellation of 17 GPS satellites. These data were processed to estimate UTl corrections every 30-minutes, then smoothed to form a UTl series with 3-hour spacing. Earth orientation data during Epoch '92 were also obtained by several VLBI groups, and were processed together to yield VLBI estimates of UTl with 3-hour time resolution. The high frequency behavior of both GPS and VLBI data sets is similar, although drifts between the two series of -0.1 ms over 2-5 days are evident. Tidally induced UTl variations from both theoretical ocean modeis and empirical determinations were compared with the GPS and VLBI series. Estimates of atmospheric angular momentum (AAM) at 6-hour intervals generated by several meteorological centers were also compared with the geodetic data. These comparisons indicate that most of the GPS signal in the diurnal and semidiurnal bands can be attributed to tidal processes, and that UTl variations over a few days are mostly atmospheric in origin.
Dickey Jean O.
Freedman Adam P.
Herring Thomas A.
Ibanez-Meier R.
Lichten Stephen M.
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