Comparison of earth rotation as inferred from radio interferometric, laser ranging and astrometric observations

Details Comparison of earth rotation as inferred from radio interferometric, laser ranging and astrometric observations Comparison of earth rotation as inferred from radio interferometric, laser ranging and astrometric observations

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983natur.302..509r&link_type=abstract

Nature (ISSN 0028-0836), vol. 302, April 7, 1983, p. 509-511. Research supported by the Division of National Mapping of Australi

Astronomy and Astrophysics

Astronomy

9

Astrometry, Earth Rotation, Laser Range Finders, Very Long Base Interferometry, Lunar Rangefinding, Satellite Observation

Scientific paper

Results of measurements of the earth's rotation vector for a 400-day period from late September 1980 to December 1981, for which date from VLBI, satellite laser ranging (SLR), and lunar laser ranging (LLR) were available, are compared. The acquisition of the data and their evaluation are described. VLBI, SLR, and classical astrometric determinations of the X-parameter required to describe the location of the rotation pole on the earth's surface are shown, and VLBI, LLR, and classical astrometric determinations of the angle of rotation about this pole (UT1) are presented. The results indicate that VLBI and SLR, at their present stages of development, yield standard errors under 20 cm in the determinations of X, about twofold smaller than obtained from classical measurements, and that VLBI and LLR yield determination of UT1 with standard errors less than 40 cm, somewhat smaller than that of the corresponding determinations from classical observations. Methods for improving these types of intercomparisons are suggested.

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