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Effects of Source Structure on Astrometry and Geodesy

Published online by Cambridge University Press:  03 August 2017

James S. Ulvestad
James S. Ulvestad*
Affiliation:
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109

Abstract

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VLBI hybrid maps of a number of radio sources have been used to make calculations of the effects of source structure on group delay and phase delay for baselines of different lengths. The effects on the two types of delay are of comparable magnitude and have a slightly stronger than linear dependence on baseline length. For sources selected to have only modest structure, the r.m.s. delay error caused by structure at 8.4 GHz is on the order of 30 to 50 picoseconds for intercontinental baselines.

Type
Geophysics
Information
Symposium - International Astronomical Union , Volume 129: The Impact of VLBI on Astrophysics and Geophysics , 1988 , pp. 429 - 430
Copyright
Copyright © Reidel 1988 

References

1. Pearson, T. J., and Readhead, A. C. S.: 1984, IAU Symp. No. 110, p. 15.Google Scholar
2. Pearson, T. J., Readhead, A. C. S., and Barthel, P. D.: 1987, IAU Symp. No. 129, this volume.Google Scholar