Improvement of the IVS-INT01 sessions by source selection: development and evaluation of the maximal source strategy

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• 作者：John Gipson ; Karen Baver
• 关键词：Very long baseline interferometry (VLBI) ; Space geodesy ; UT1 ; Radio astronomy
• 刊名：Journal of Geodesy
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：90
• 期：3
• 页码：287-303
• 全文大小：2,883 KB
• 参考文献：Baver K, Gipson J (2010) Strategies for improving the IVS-INT01 UT1 estimates. In: Behrend D, Baver KD (eds) International VLBI service for geodesy and astrometry 2010 general meeting proceedings, pp 256–260, NASA/CP-2010-215864
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• 作者单位：John Gipson (1)
  Karen Baver (1)
  
  1. NVI, Inc., 7257D Hanover Parkway, Greenbelt, MD, 20770, USA
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geophysics and Geodesy
  Mathematical Applications in Geosciences
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-1394

文摘

The primary purpose of the International very long baseline interferometry (VLBI) Service for Geodesy and Astrometry Intensive sessions is the rapid estimation of UT1-TAI. Improving the robustness and the precision of the UT1 estimates from the Intensives is an important goal. The INT01 series, which usually uses the Kokee–Wettzell baseline and runs on weekdays, is the most regular IVS Intensive series. The United States Naval Observatory which schedules these sessions traditionally used a small list of strong sources. In 2009, the authors requested and received the use of nine IVS R&D sessions for the evaluation of a new strategy which draws on all sources mutually visible on the Kokee–Wettzell baseline. Analysis of these sessions was sufficiently promising that in July 2010, USNO began to alternate the use of the original and the new strategy in scheduling the INT01 sessions to assess the operational effectiveness of the proposed strategy. In this paper, we summarize our analysis of the R&D sessions, and we also analyze 2 years of operational INT01 sessions. Considered in toto, the new strategy performs as well as, or better than, the original strategy in terms of several measures of robustness and precision. Furthermore, the RMS difference of the UT1 estimates from the 1 h operational INTO1 sessions and concurrently run 24 h VLBI sessions is 21.0 \(\upmu \)s, compared to 30.7 \(\upmu \)s using the standard strategy, indicating that the new strategy is, on average, 30 % more accurate. Keywords Very long baseline interferometry (VLBI) Space geodesy UT1 Radio astronomy