Please use this identifier to cite or link to this item: http://dx.doi.org/10.14279/depositonce-11841
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Main Title: An improved empirical harmonic model of the celestial intermediate pole offsets from a global VLBI solution
Author(s): Belda, Santiago
Heinkelmann, Robert
Ferrándiz, José M.
Karbon, Maria
Nilsson, Tobias
Schuh, Harald
Type: Article
Language Code: en
Abstract: Very Long Baseline Interferometry (VLBI) is the only space geodetic technique capable of measuring all the Earth orientation parameters (EOP) accurately and simultaneously. Modeling the Earth's rotational motion in space within the stringent consistency goals of the Global Geodetic Observing System (GGOS) makes VLBI observations essential for constraining the rotation theories. However, the inaccuracy of early VLBI data and the outdated products could cause non-compliance with these goals. In this paper, we perform a global VLBI analysis of sessions with different processing settings to determine a new set of empirical corrections to the precession offsets and rates, and to the amplitudes of a wide set of terms included in the IAU 2006/2000A precession-nutation theory. We discuss the results in terms of consistency, systematic errors, and physics of the Earth. We find that the largest improvements w.r.t. the values from IAU 2006/2000A precession-nutation theory are associated with the longest periods (e.g., 18.6-yr nutation). A statistical analysis of the residuals shows that the provided corrections attain an error reduction at the level of 15 μas. Additionally, including a Free Core Nutation (FCN) model into a priori Celestial Pole Offsets (CPOs) provides the lowest Weighted Root Mean Square (WRMS) of residuals. We show that the CPO estimates are quite insensitive to TRF choice, but slightly sensitive to the a priori EOP and the inclusion of different VLBI sessions. Finally, the remaining residuals reveal two apparent retrograde signals with periods of nearly 2069 and 1034 days.
URI: https://depositonce.tu-berlin.de/handle/11303/13043
http://dx.doi.org/10.14279/depositonce-11841
Issue Date: 28-Sep-2017
Date Available: 16-Apr-2021
DDC Class: 550 Geowissenschaften
Subject(s): astrometry
catalogs
reference systems
interferometric
License: https://creativecommons.org/licenses/by/4.0/
Journal Title: Astronomical Journal
Publisher: Institute of Physics Publishing
Publisher Place: London
Volume: 154
Issue: 4
Article Number: 166
Publisher DOI: 10.3847/1538-3881/aa8869
EISSN: 1538-3881
ISSN: 0004-6256
Appears in Collections:FG Satellitengeodäsie » Publications

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