Paper:	High Precision Astrometry with Closure Constraints
Volume:	144, Radio Emission from Galactic and Extragalactic Compact Sources, IAU Colloquium 164
Page:	389
Authors:	Ros, E.; Marcaide, J. M.; Guirado, J. C.; Ratner, M. I.; Shapiro, I. I.; Krichbaum, T. P.; Witzel, A.; Preston, R. A.
Abstract:	We determine the relative separations of the sources in the triangle 1803+784/1928+738/2007+777 with submilliarcsecond accuracy from global 8.4 GHz VLBI observations. We remove the ionospheric contribution to the phase-delay observable using ionospheric total electron content estimates obtained from Global Positioning System (GPS) data. The triangular geometry provides a consistency check through sky closure.

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