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Data Assimilation Techniques for Ionospheric Reference Scenarios – project overview and first results

Gerzen, Tatjana and Hoque, Mohammed Mainul and Wilken, Volker and Minkwitz, David and Schlüter, Stefan (2015) Data Assimilation Techniques for Ionospheric Reference Scenarios – project overview and first results. EGU 2015, 12.-17.04.2015, Viena, Austria.

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Official URL: http://meetingorganizer.copernicus.org/EGU2015/EGU2015-11545.pdf

Abstract

The European Geostationary Navigation Overlay Service (EGNOS) is the European Satellite Based Augmenta- tion Service (SBAS) that provides value added services, in particular to Safety of Live (SoL) users of the Global Navigation Satellite Systems (GNSS). In the frame of the European GNSS Evolution Programme (EGEP), ESA has launched several activities, which are aiming to support the design, development and qualification of the future operational EGNOS infrastructure and associated services. The ionosphere is the part of the upper Earth’s atmosphere between about 50 km and 1000 km above the Earth’s surface, which contains sufficient free electrons to cause strong impact on radio signal propagation. Therefore, treatment of the ionosphere is a critical issue to guarantee the EGNOS system performance. In order to conduct the EGNOS end-to-end performance simulations and to assure the capability for maintaining integrity of the EGNOS system especially during ionospheric storm conditions, Ionospheric Reference Scenarios (IRSs) are introduced by ESA. The project Data Assimilation Techniques for Ionospheric Reference Scenarios (DAIS) – aims to generate im- proved EGNOS IRSs by combining space borne and ground based GNSS observations. The main focus of this project is to demonstrate that ionospheric radio occultation (IRO) measurements can significantly contribute to fill data gaps in GNSS ground networks (particularly in Africa and over the oceans) when generating the IRSs. The primary tasks are the calculation and validation of time series of IRSs (i.e. TEC maps) by a 3D assimilation approach that combines IRO and ground based GNSS measurements with an ionospheric background model in an optimal way. In the first phase of the project we selected appropriate test periods, one presenting perturbed and the other one – nominal ionospheric conditions, collected and filtered the corresponding data. We defined and developed an appli- cable technique for the 3D assimilation and applied this technique for the generation of IRSs covering the EGNOS V3 service area. This presentation gives an overview about the DAIS project and the first results. We outline the assimilation approach, show test run results and finally address and discuss open questions.

Item URL in elib:https://elib.dlr.de/96820/
Document Type:Conference or Workshop Item (Poster)
Title:Data Assimilation Techniques for Ionospheric Reference Scenarios – project overview and first results
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Gerzen, Tatjanatatjana.gerzen (at) dlr.deUNSPECIFIED
Hoque, Mohammed MainulUNSPECIFIEDUNSPECIFIED
Wilken, Volkervolker.wilken (at) dlr.deUNSPECIFIED
Minkwitz, Daviddavid.minkwitz (at) dlr.deUNSPECIFIED
Schlüter, StefanUNSPECIFIEDUNSPECIFIED
Date:April 2015
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Ionospheric Reference Scenarios, Data assimilation, Ionosphere, 3D, Reconstruction, EGNOS, Ionospheric radio occultation
Event Title:EGU 2015
Event Location:Viena, Austria
Event Type:international Conference
Event Dates:12.-17.04.2015
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:29 Jun 2015 15:07
Last Modified:29 Jun 2015 15:07

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