Other
Scientific paper
Sep 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985baicz..36..301m&link_type=abstract
Astronomical Institutes of Czechoslovakia, Bulletin (ISSN 0004-6248), vol. 36, Sept. 1985, p. 301-305.
Other
Astronomical Coordinates, Earth Rotation, Reference Systems, Periodic Variations, Polar Coordinates
Scientific paper
The stability of terrestrial reference systems was investigated by comparing the linear trends in different polar coordinate systems (BIH, ILS, IPMS, DMA). Especially the ILS system shows a greater deviation from the other systems. The possible reasons for this divergence were discussed. For the investigation of local influences the trends of neighbouring instruments are analyzed. The results certainly give evidence of the secular changes of station coordinates, but only partly of their causes, which seem to be mainly of a nongeophysical nature. Global and local effects are superimposed not only in the secular changes, but also in the irregular and periodic variations of the earth's rotation parameters. It was confirmed, that the stability of the terrestrial reference frame depends on the choice of stations, whose observations are used to realize this system. The transformation parameters between two reference systems depend on the time for which they were determined.
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