Computer Science
Scientific paper
Sep 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994itn....16d..37w&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
Computer Science
Scientific paper
Two analyses of high frequency Earth orientation were performed. In the first study, variations in universal time and polar motion due to ocean tides at nearly diurnal and neariy semidiurnal frequencies were determined from analysis of laser ranging to the Lageos satellite over the period from 1987 to 1992. The adjusted diurnal tides were K{, S{, Px, 0{ and Bi while the semidiurnal tides were AT2, 52, M2, and N2. In the second study, daily estimates of diurnal and semidiurnal UTl variations were determined for a 49-day interval during the summer 1992 IGS campaign using doubly differenced GPS phase data. The results were then compared to the tidal variations observed from Lageos. For both studies, formulations were used that explicitly separated prograde and retrograde terms in the polar motion in order to eliminate aliasing from the singularity of retrograde wobble with long period orbit error and nutation. The results of the EOP variations at tidal frequencies obtained in this study agree well with those from the VLBI studies, typically at the 2-3 μs level in universal time and 30-50 (μas level in polar motion. The results from the GPS analysis indicated independent daily determination of diurnal and semidiurnal variations of UTl with accuracies at the 20-30 μs level.
Eanes Richard J.
Sonntag John G.
Watkins Michael M.
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