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Radiointerferometric polar motion determination using a very long north-south baseline

Published online by Cambridge University Press:  03 August 2017

A Nothnagel
Affiliation:
HartRAO/NITR, PO Box 3718, Johannesburg 2000, RSA
G. D. Nicolson
Affiliation:
HartRAO/NITR, PO Box 3718, Johannesburg 2000, RSA
H Schuh
Affiliation:
Geodetic Institute, Nussallee 17, D-5300 Bonn 1, FRG
J Campbell
Affiliation:
Geodetic Institute, Nussallee 17, D-5300 Bonn 1, FRG
H Cloppenburg
Affiliation:
Geodetic Institute, Nussallee 17, D-5300 Bonn 1, FRG
R Kilger
Affiliation:
Fundamentalstation Wettzell, D-8493 Kötzting, FRG

Abstract

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The first high accuracy VLBI measurements with the Hartebeesthoek Radio Astronomy Observatory (HartRAO) at the southern end of the African tectonic plate were made possible at the beginning of 1986 through the loan of a MARK III DAT to HartRAO by the US National Geodetic Survey. Six twenty-four hour experiments spread over thirty-three days were used to precisely determine the HartRAO station position and to measure baseline lengths to Europe and North America. Interleaved between these multi-station experiments, a single baseline from Wettzell to HartRAO was used for two hours on a daily basis in order to measure pole positions. The formal errors of the x and y pole component determinations for each day are about ±2 mas and ±1 mas respectively, but an offset of about 6 mas from the IRIS values remains to be investigated.

Type
III. Determination of Earth Rotation Parameters
Copyright
Copyright © Reidel 1988 

References

[1] Herring, T.A., Gwinn, C.R., Shapiro, I.I., Geodesy by Radio Interferometry: Studies of the forced Nutations of the Earth, J. Geophys. Res., 91, No. B5, p. 4745, 1986.CrossRefGoogle Scholar