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Reconstruction of the ionospheric electron density by geostatistical inversion

Minkwitz, David und van den Boogaart, Karl Gerald und Hoque, Mohammed Mainul und Gerzen, Tatjana (2015) Reconstruction of the ionospheric electron density by geostatistical inversion. EGU General Assembly 2015, 2015-04-12 - 2015-04-17, Vienna, Austria.

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Kurzfassung

The ionosphere is the upper part of the atmosphere where sufficient free electrons exist to affect the propagation of radio waves. Typically, the ionosphere extends from about 50 - 1000 km and its morphology is mainly driven by solar radiation, particle precipitation and charge exchange. Due to the strong ionospheric impact on many applications dealing with trans-ionospheric signals such as Global Navigation Satellite Systems (GNSS) positioning, navigation and remote sensing, the demand for a highly accurate reconstruction of the electron density is ever increasing. Within the Helmholtz Alliance project “Remote Sensing and Earth System Dynamics” (EDA) the utilization of the upcoming radar mission TanDEM-L and its related products are prepared. The TanDEM-L mission will operate in L-band with a wavelength of approximately 24 cm and aims at an improved understanding of environmental processes and ecosystem change, e.g. earthquakes, volcanos, glaciers, soil moisture and carbon cycle. Since its lower frequency compared to the X-band (3 cm) and C-band (5 cm) radar missions, the influence of the ionosphere will increase and might lead to a significant degradation of the radar image quality if no correction is applied. Consequently, our interest is the reconstruction of the ionospheric electron density in order to mitigate the ionospheric delay. Following the ionosphere’s behaviour we establish a non-stationary and anisotropic spatial covariance model of the electron density separated into a vertical and horizontal component. In order to estimate the model’s parameters we chose a maximum likelihood approach. This approach incorporates GNSS total electron content measurements, representing integral measurements of the electron density between satellite to receiver ray paths, and the NeQuick model as a non-stationary trend. Based on a multivariate normal distribution the spatial covariance model parameters are optimized and afterwards the 3D electron density can be calculated by kriging for arbitrary points or grids of interest.

elib-URL des Eintrags:https://elib.dlr.de/96037/
Dokumentart:Konferenzbeitrag (Poster)
Titel:Reconstruction of the ionospheric electron density by geostatistical inversion
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Minkwitz, Daviddavid.minkwitz (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
van den Boogaart, Karl GeraldTU Freiberg, HZDRNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Hoque, Mohammed MainulMainul.Hoque (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Gerzen, Tatjanatatjana.gerzen (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:17 April 2015
Referierte Publikation:Nein
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Tomography, reconstruction, geostatistics, kriging, covariance, electron density
Veranstaltungstitel:EGU General Assembly 2015
Veranstaltungsort:Vienna, Austria
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:12 April 2015
Veranstaltungsende:17 April 2015
Veranstalter :European Geosciences Union
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Kommunikation und Navigation
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R KN - Kommunikation und Navigation
DLR - Teilgebiet (Projekt, Vorhaben):R - Vorhaben Ionosphäre (alt)
Standort: Neustrelitz
Institute & Einrichtungen:Institut für Kommunikation und Navigation > Navigation
Hinterlegt von: Minkwitz, David
Hinterlegt am:21 Apr 2015 10:29
Letzte Änderung:24 Apr 2024 20:01

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