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The combination of polar motion observations

Published online by Cambridge University Press:  03 August 2017

Clark R. Wilson  and
R. O. Vicente
Clark R. Wilson
Affiliation:
Center for Space Research, Department of Geological Sciences, The University of Texas at Austin
R. O. Vicente
Affiliation:
Faculty of Sciences, Department of Applied Mathematics, Lisbon, Portugal

Abstract

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Polar motion data for the period 1981–1985 are used to obtain a combined solution from Doppler, Satellite Laser Ranging, and Astrometric observations. The combined solution is a weighted average of the three series, with weights determined from reported errors which are scaled so that they agree with errors estimated from differences among the various series. The combined solution is effective in removing spurious deviations in the pole path which appear in a single series. However, we also show that estimated errors can be unreliable when derived from short time series, when one series is much less noisy than the others. Thus, a combined solution where weights depend upon estimated errors can yield poor results, and we demonstrate this effect by comparing a combined solution for 1984–85 with the independent IRIS series.

Type
III. Determination of Earth Rotation Parameters
Information
Symposium - International Astronomical Union , Volume 128: Earth's Rotation and Reference Frames for Geodesy and Geodynamics , 1988 , pp. 247 - 255
Copyright
Copyright © Reidel 1988 

References

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Steppe, J. Eubanks, T., and Spieth, M., 1985. ‘Intercomparison of Polar Motion Measurements During the Merit Period’, in Proceedings of the International Conference on Earth Rotation and the Terrestrial Reference Frame, Volume 2, Mueller, I. editor, The Ohio State University Department of Geodetic Science.Google Scholar
Vicente, R., and Wilson, C., 1986. ‘Polar Motion Estimates From Linear Combinations of Independent Series’, Astron. Nachr, 307, pp. 137–147.CrossRefGoogle Scholar
Wilson, C., and Vicente, R., 1986. ‘The Combination of Polar Motion Observations’, Proceedings of the IAG Symposium, Figure and Dynamics of the Earth, Moon, and Planets, Holota, P., editor, Research Institute of Geodesy, Topography, and Cartography, Prague, Czechoslovakia.Google Scholar