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Prospects for UT1 Measurements from VLBI Intensive SessionsVery Long Baseline Interferometry (VLBI) Intensives are one-hour single baseline sessions to provide Universal Time (UT1) in near real-time up to a delay of three days if a site is not e-transferring the observational data. Due to the importance of UT1 estimates for the prediction of Earth orientation parameters, as well as any kind of navigation on Earth or in space, there is not only the need to improve the timeliness of the results but also their accuracy. We identify the asymmetry of the tropospheric delays as the major error source, and we provide two strategies to improve the results, in particular of those Intensives which include the station Tsukuba in Japan with its large tropospheric variation. We find an improvement when (1) using ray-traced delays from a numerical weather model, and (2) when estimating tropospheric gradients within the analysis of Intensive sessions. The improvement is shown in terms of reduction of rms of length-of-day estimates w.r.t. those derived from Global Positioning System observations
Document ID
20110011851
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Boehm, Johannes (Technische Univ. Vienna, Austria)
Nilsson, Tobias (Technische Univ. Vienna, Austria)
Schuh, Harald (Technische Univ. Vienna, Austria)
Date Acquired
August 25, 2013
Publication Date
December 1, 2010
Publication Information
Publication: Proceedings of the Sixth General Meeting of the International VLBI Service for Geodesy and Astrometry
Subject Category
Geophysics
Funding Number(s)
OTHER: SCHUH 1103/3-2
Distribution Limits
Public
Copyright
Public Use Permitted.

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IDRelationTitle20110011794Collected WorksProceedings of the Sixth General Meeting of the International VLBI Service for Geodesy and Astrometry
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