Statistics – Computation
Scientific paper
Mar 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999evga.conf...25n&link_type=abstract
13th Working Meeting on European VLBI for Geodesy and Astrometry, p. 25 - 31
Statistics
Computation
Scientific paper
In summer 1996 a major repair of the Effelsberg 100 m radio telescope's ground track had to be carried out due to cracks in the tracks surface. This led to a significant permanent displacement of the VLBI reference point. A local survey was, therefore, organized to measure the position of the reference point with respect to three permanent ground markers which had also been used in earlier measurements of this type. Since the reference point is not accessible physically an excentric target mark close to the reference point had to be used which complicated the work extraordinarily. For the analysis of the measurements a model is developed which a) describes the movements of the excentric target mark when the telescope is moved in azimuth and elevation and b) which corrects for thermal expansion effects. In order to compare the 1997 survey with another one carried out in 1992 a re-computation of the earlier measurement is done on the basis of the model mentioned above. The comparison of the two surveys yields a significant increase in height of the Effelsberg telescope of +25.4 ± 3 mm from 1992 to 1997.
Nothnagel Axel
Sauerbier M.
Sobanski M.
Wirtz C.
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