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Simultaneous multiplicative column normalized method (SMART) for the 3D ionosphere tomography in comparison with other algebraic methods

Gerzen, Tatjana and Minkwitz, David (2016) Simultaneous multiplicative column normalized method (SMART) for the 3D ionosphere tomography in comparison with other algebraic methods. Annales Geophysicae (34), pp. 97-115. Copernicus Publications. DOI: 10.5194/angeo-34-97-2016 ISSN 0992-7689

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Official URL: http://www.ann-geophys.net/34/97/2016/

Abstract

The accuracy and availability of satellite-based applications like GNSS positioning and remote sensing crucially depends on the knowledge of the ionospheric electron density distribution. The tomography of the ionosphere is one of the major tools to provide link specific ionospheric corrections as well as to study and monitor physical processes in the ionosphere. In this paper, we introduce a simultaneous multiplicative column-normalized method (SMART) for electron density reconstruction. Further, SMART+ is developed by combining SMART with a successive correction method. In this way, a balancing between the measurements of intersected and not intersected voxels is realised. The methods are compared with the well-known algebraic reconstruction techniques ART and SART. All the four methods are applied to reconstruct the 3-D electron density distribution by ingestion of ground-based GNSS TEC data into the NeQuick model. The comparative case study is implemented over Europe during two periods of the year 2011 covering quiet to disturbed ionospheric conditions. In particular, the performance of the methods is compared in terms of the convergence behaviour and the capability to reproduce sTEC and electron density profiles. For this purpose, independent sTEC data of four IGS stations and electron density profiles of four ionosonde stations are taken as reference. The results indicate that SMART significantly reduces the number of iterations necessary to achieve a predefined accuracy level. Further, SMART+ decreases the median of the absolute sTEC error up to 15, 22, 46 and 67% compared to SMART, SART, ART and NeQuick respectively.

Item URL in elib:https://elib.dlr.de/96821/
Document Type:Article
Title:Simultaneous multiplicative column normalized method (SMART) for the 3D ionosphere tomography in comparison with other algebraic methods
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Gerzen, Tatjanatatjana.gerzen (at) dlr.deUNSPECIFIED
Minkwitz, Daviddavid.minkwitz (at) dlr.deUNSPECIFIED
Date:22 January 2016
Journal or Publication Title:Annales Geophysicae
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.5194/angeo-34-97-2016
Page Range:pp. 97-115
Publisher:Copernicus Publications
ISSN:0992-7689
Status:Published
Keywords:3D Ionopshere, Reconstruction, Tomography, Data Assimilation, Algebraic Reconstruction Methods, GNSS, slant TEC, Modelling
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Communication and Navigation
DLR - Research area:Raumfahrt
DLR - Program:R KN - Kommunikation und Navigation
DLR - Research theme (Project):R - Vorhaben Ionosphäre
Location: Neustrelitz
Institutes and Institutions:Institute of Communication and Navigation > Navigation
Deposited By: Gerzen, Tatjana
Deposited On:26 Jan 2016 10:52
Last Modified:08 Mar 2018 18:47

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