Testing impact of the strategy of VLBI data analysis on the estimation of earth orientation parameters and station coordinates

A. Wielgosz , Monika Tercjak , Aleksander Brzeziński

Abstract

Very Long Baseline Interferometry (VLBI) is the only space geodetic technique capable to realise the Celestial Reference Frame and tie it with the Terrestrial Reference Frame. It is also the only technique, which measures all the Earth Orientation Parameters (EOP) on a regular basis, thus the role of VLBI in determination of the universal time, nutation and polar motion and station coordinates is invaluable. Although geodetic VLBI has been providing observations for more than 30 years, there are no clear guidelines how to deal with the stations or baselines having significantly bigger post-fit residuals than the other ones. In our work we compare the common weighting strategy, using squared formal errors, with strategies involving exclusion or down-weighting of stations or baselines. For that purpose we apply the Vienna VLBI Software VieVS with necessary additional procedures. In our analysis we focus on statistical indicators that might be the criterion of excluding or down-weighting the inferior stations or baselines, as well as on the influence of adopted strategy on the EOP and station coordinates estimation. Our analysis shows that in about 99% of 24-hour VLBI sessions there is no need to exclude any data as the down-weighting procedure is sufficiently efficient. Although results presented here do not clearly indicate the best algorithm, they show strengths and weaknesses of the applied methods and point some limitations of automatic analysis of VLBI data. Moreover, it is also shown that the influence of the adopted weighting strategy is not always clearly reflected in the results of analysis.
Author A. Wielgosz
A. Wielgosz,,
-
, Monika Tercjak KGAG
Monika Tercjak,,
- Chair of Geodesy and Geodetic Astronomy
, Aleksander Brzeziński KGAG
Aleksander Brzeziński,,
- Chair of Geodesy and Geodetic Astronomy
Journal seriesReports on Geodesy and Geoinformatics, ISSN 2391-8365, e-ISSN 2391-8152
Issue year2016
Vol101
Pages1-15
Publication size in sheets0.7
Keywords in EnglishVLBI, weighting strategy, EOP, station coordinates
DOIDOI:10.1515/rgg-2016-0017
Internal identifier79/2016
Languageen angielski
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2016_Brzeziński_Tercjak_Testing_impact_of_the_79.pdf 1.91 MB
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2016_Oświadczenie_Brzeziński_Tercjak_Testing_impact_of_the_79.pdf 455.68 KB
Score (nominal)13
ScoreMinisterial score = 13.0, 28-11-2017, ArticleFromJournal
Ministerial score (2013-2016) = 13.0, 28-11-2017, ArticleFromJournal
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