Geodesy by radio interferometry: Effects of atmospheric modeling errors on estimates of baseline length
Article first published online: 7 DEC 2012
Copyright 1985 by the American Geophysical Union.
Volume 20, Issue 6, pages 1593–1607, November-December 1985
How to Cite
1985), Geodesy by radio interferometry: Effects of atmospheric modeling errors on estimates of baseline length, Radio Sci., 20(6), 1593–1607, doi:10.1029/RS020i006p01593., , , , and (
- Issue published online: 7 DEC 2012
- Article first published online: 7 DEC 2012
- Manuscript Accepted: 27 JUN 1985
- Manuscript Received: 14 MAR 1984
Analysis of very long baseline interferometry data indicates that systematic errors in prior estimates of baseline length, of order 5 cm for ∼ 8000-km baselines, were due primarily to mismodeling of the electrical path length of the troposphere and mesosphere (“atmospheric delay”). Here we discuss observational evidence for the existence of such errors in the previously used models for the atmospheric delay and develop a new “mapping” function for the elevation angle dependence of this delay. The delay predicted by this new mapping function differs from ray trace results by less than ∼ 5 mm, at all elevations down to 5° elevation, and introduces errors into the estimates of baseline length of ≲ 1 cm, for the multistation intercontinental experiment analyzed here.