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Fast ionospheric correction using Galileo Az coefficients and the NTCM model

Hoque, Mohammed Mainul and Jakowski, Norbert and Perez, R Orus (2019) Fast ionospheric correction using Galileo Az coefficients and the NTCM model. GPS Solutions. Springer. DOI: 10.1007/s10291-019-0833-3 ISBN 1080-5370 ISSN 1080-5370

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Official URL: https://link.springer.com/article/10.1007/s10291-019-0833-3

Abstract

Europe’s Global Navigation Satellite System (GNSS) Galileo broadcasts three parameters for ionospheric correction as part of satellite navigation messages. They are called effective ionization coefficients and are used to drive the NeQuickG model in single frequency Galileo operations. The NeQuickG is a three-dimensional electron density model based on several Epstein layers whose anchor points, such as ionospheric peak densities and heights, are derived using the spatial and temporal interpolation of numerous global maps. This makes the NeQuickG computationally more expensive when compared with the GPS equivalent, the Klobuchar model. We propose here an alternative ionospheric correction approach for single frequency Galileo users. In the proposed approach, the broadcast coefficients are used to drive another ionospheric model called the Neustrelitz Total Electron Content Model (NTCM) instead of the NeQuickG. The proposed NTCM is driven by Galileo broadcast parameters and the investigation shows that it performs better than the NeQuickG when compared with the reference Vertical Total Electron Content (VTEC) data. It is found that the Root Mean Squares (RMS) and Standard Deviations (STD) of residuals are approx. 1.6 and 1.2 TECU (1 TECU = 1016 electrons/m2) less for the NTCM than the NeQuickG. A comparison with the slant TEC reference data shows that the STD, mean and RMS residuals are approx. 9.5, 0.6, 10.0 TECU for the NeQuickG whereas for the NTCM, they are 9.3, 2.5, 10.1 TECU respectively. A comparison with Jason-2 altimeter datasets reveals that the NTCM performs better than the NeQuickG with RMS/STD deviations of approx. 7.5/7.4 and 8.2/7.9 TECU respectively. The investigation shows that the Galileo broadcast messages can be effectively used for driving the NTCM.

Item URL in elib:https://elib.dlr.de/129714/
Document Type:Article
Title:Fast ionospheric correction using Galileo Az coefficients and the NTCM model
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Hoque, Mohammed MainulMainul.Hoque (at) dlr.deUNSPECIFIED
Jakowski, NorbertNorbert.Jakowski (at) dlr.dehttps://orcid.org/0000-0003-3174-2624
Perez, R Orusraul.orus.perez (at) esa.intUNSPECIFIED
Date:2019
Journal or Publication Title:GPS Solutions
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1007/s10291-019-0833-3
Publisher:Springer
ISSN:1080-5370
ISBN:1080-5370
Status:Published
Keywords:GNSS, Galileo ionosphere correction, NTCM, NeQuickG
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 for Solar-Terrestrial Physics
Deposited By: Hoque, Mohammed Mainul
Deposited On:09 Jun 2020 18:13
Last Modified:09 Jun 2020 18:13

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