Sibsonian and non-Sibsonian natural neighbour interpolation of the total electron content value

In radioastronomy the interferometric measurement between radiotelescopes located relatively close to each other helps removing ionospheric effects. Unfortunately, in case of networks such as LOw Frequency ARray (LOFAR), due to long baselines (currently up to 1500 km), interferometric methods fail t...

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Bibliographic Details
Published in:Acta geophysica 2017-03, Vol.65 (1), p.13-28
Main Authors: Kotulak, Kacper, Froń, Adam, Krankowski, Andrzej, Pulido, German Olivares, Henrandez-Pajares, Manuel
Format: Article
Language:English
Subjects:
65 Numerical analysis
65C Probabilistic methods, simulation and stochastic differential equations
70 Mechanics of particles and systems
70M20 Orbital mechanics
86 Geophysics
Anàlisi numèrica
Classificació AMS
Earth and Environmental Science
Earth Sciences
Geofísica
Geophysics
Geophysics/Geodesy
Geotechnical Engineering & Applied Earth Sciences
Interferometry
Investigació operativa
Ionosphere
Matemàtica aplicada a les ciències
Matemàtiques i estadística
Numerical analysis
Orbital mechanics
Radio telescopes
Research Article
Satèlits artificials
Simulació
Simulation methods
Structural Geology
Topology
Àrees temàtiques de la UPC
Òrbites
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Summary:In radioastronomy the interferometric measurement between radiotelescopes located relatively close to each other helps removing ionospheric effects. Unfortunately, in case of networks such as LOw Frequency ARray (LOFAR), due to long baselines (currently up to 1500 km), interferometric methods fail to provide sufficiently accurate ionosphere delay corrections. Practically it means that systems such as LOFAR need external ionosphere information, coming from Global or Regional Ionospheric Maps (GIMs or RIMs, respectively). Thanks to the technology based on Global Navigation Satellite Systems (GNSS), the scientific community is provided with ionosphere sounding virtually worldwide. In this paper we compare several interpolation methods for RIMs computation based on scattered Vertical Total Electron Content measurements located on one thin ionospheric layer (Ionospheric Pierce Points—IPPs). The results of this work show that methods that take into account the topology of the data distribution (e.g., natural neighbour interpolation) perform better than those based on geometric computation only (e.g., distance-weighted methods).
ISSN:1895-6572
1895-7455
DOI:10.1007/s11600-017-0003-3