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The Quality of Sub-daily Polar Motion Estimates based on GPS Observations

Published online by Cambridge University Press:  12 April 2016

R. Weber  and
M. Rothacher
R. Weber
Affiliation:
Department of Advanced Geodesy, University of Technology Vienna, Gusshausstrasse 27-29, Vienna, A-1040, Austria
M. Rothacher
Affiliation:
Astronomical Institute, University of Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland

Abstract

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Since June 1992 the International GPS Service (IGS) has provided time series of its products comprising, among others, very accurate polar motion estimates. While the products of the pilot phase were based on data from about 30 permanent stations, the network now consists of about 140 globally distributed tracking sites (Neilan, 1998).

Several efforts have been undertaken at the CODE Analysis Center of the IGS aiming at the optimization of the global processing strategy, including satellite orbit and troposphere modeling. In addition, the time resolution of the ERP series has been increased to two hours or even one hour. This paper deals with sub-daily polar motion and LOD series of four months in late 1996, which have been calculated in a reprocessing step very recently. The investigations performed allow for comparisons of the new series with results stemming from intensive VLBI tracking campaigns and for the detailed study of the influence of the processing strategy and parametrization on the ERP series.

Type
Part 6. Daily and Subdaily Polar Motion
Information
International Astronomical Union Colloquium , Volume 178: Polar Motion: Historical and Scientific Problems , 2000 , pp. 527 - 532
Copyright
Copyright © Astronomical Society of the Pacific 2000

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