Article (Scientific journals)
Impact of Limited Satellite Visibility on Estimates of Vertical Land Movements
Abraha, Kibrom Ebuy; Teferle, Felix Norman; Hunegnaw, Addisu et al.
2016In International Association of Geodesy Symposia, p. 1-8
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Keywords :
Azimuth-dependent masking; Vertical land movements; Global navigation satellite systems
Abstract :
[en] The number of Global Navigation Satellite System (GNSS) satellites and their geometry directly affect the quality of positioning and derived satellite products. Accordingly, the International GNSS Service (IGS) recommends GNSS antennas to be installed away from natural and man-made surfaces and structures, which may affect the incoming signals through severe multipath or obstructions. Following these recommendations, continuous GNSS (cGNSS) stations are generally located in low multipath environments with minimal signal obstructions. However, some applications require GNSS antennas to be installed at specific locations in order to measure local processes. In support of sea level studies, cGNSS stations are established at or close to tide gauges in order to accurately monitor the local vertical land movements experienced by the sea level sensors. However, the environment at the tide gauge might not be optimal for GNSS observations due to the aforementioned station-specific effects, which may degrade the quality of coordinate solutions. This study investigates the impact of severe signal obstructions on long-term position time series for some selected stations. A masking profile from an actually obstructed site is extracted, simulated and applied to unobstructed IGS sites. To investigate these effects, we imple- mented a new feature called azimuth-dependent elevation masking in the Bernese GNSS Software version 5.2. We present our preliminary results on the use of this new feature to study the impact of different obstruction scenarios on long-term GNSS position time series and vertical land movement estimates. The results show that a certain obstruction, with the effect being highly dependent on its severity and azimuthal direction, affects all coordinate components with the effect being more significant for the Up component. Moreover, it causes changes in the rate estimates and increases the rate uncertainty with the effect being site-specific.
Research center :
Institute of Geodesy and Geophysics, University of Luxembourg, Luxembourg;University of Luxembourg: High Performance Computing - ULHPC
Disciplines :
Earth sciences & physical geography
Author, co-author :
Abraha, Kibrom Ebuy ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit
Teferle, Felix Norman ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit
Hunegnaw, Addisu  ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit
Dach, Rolf;  Astronomical Institute, University of Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland
External co-authors :
yes
Language :
English
Title :
Impact of Limited Satellite Visibility on Estimates of Vertical Land Movements
Publication date :
21 July 2016
Journal title :
International Association of Geodesy Symposia
ISSN :
0939-9585
Publisher :
Springer, Heidelberg, Germany
Pages :
1-8
Peer reviewed :
Peer Reviewed verified by ORBi
FnR Project :
FNR6835562 - Multi-gnss Benefits To Long-term Monitoring Applications In The Geosciences, 2013 (01/05/2014-30/04/2018) - Kibrom Ebuy Abraha
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since 09 December 2016

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