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Detection and Estimation of Equatorial Spread F Scintillation using Synthetic Aperture Radar

Kim, Jun Su and Papathanassiou, Konstantinos and Sato, Hiroatsu and Quegan, Shaun (2017) Detection and Estimation of Equatorial Spread F Scintillation using Synthetic Aperture Radar. IEEE Transactions on Geoscience and Remote Sensing, 55 (12), pp. 6713-6725. IEEE - Institute of Electrical and Electronics Engineers. DOI: 10.1109/TGRS.2017.2731943 ISSN 0196-2892

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Abstract

A significant amount of the data acquired by sun-synchronous space-borne low-frequency synthetic aperture radars (SARs) through the postsunset equatorial sector are distorted by the ionospheric scintillations due to the presence of plasma irregularities and their zonal and vertical drift. In the focused SAR images, the distortions due to the postsunset equatorial ionospheric scintillations appear in the form of amplitude and/or phase ''stripe'' patterns of high spatial frequency aligned to the projection of the geomagnetic field onto the SAR image plane. In this paper, a methodology to estimate the height and the drift velocity of the scintillations from the ''stripe'' patterns detected in the SAR images is proposed. The analysis is based on the fact that the zonal and vertical drift of the plasma irregularities are, at the equatorial zone, perpendicular to the geomagnetic field which is almost parallel aligned to the orbit. The methodology takes advantage of the time lapse and change of imaging geometry across azimuth subapertures. The obtained height estimates agree well with the reference measurements and independent estimates reported in the literature, while the drift velocities appear slightly overestimated. This can be attributed to a suboptimum geometry configuration but also to a decoupling of the ambient ionosphere and the plasma irregularities.

Item URL in elib:https://elib.dlr.de/110656/
Document Type:Article
Title:Detection and Estimation of Equatorial Spread F Scintillation using Synthetic Aperture Radar
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Kim, Jun SuUNSPECIFIEDUNSPECIFIED
Papathanassiou, KonstantinosUNSPECIFIEDUNSPECIFIED
Sato, Hiroatsuhiroatsu.sato (at) dlr.deUNSPECIFIED
Quegan, Shaununiversity of sheffieldUNSPECIFIED
Date:December 2017
Journal or Publication Title:IEEE Transactions on Geoscience and Remote Sensing
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:55
DOI :10.1109/TGRS.2017.2731943
Page Range:pp. 6713-6725
Publisher:IEEE - Institute of Electrical and Electronics Engineers
ISSN:0196-2892
Status:Published
Keywords:Synthetic aperture radar, Plasmas, Azimuth, Ionosphere, Orbits, Geometry, Magnetic resonance imaging, Ionosphere, scintillations
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Tandem-L Vorstudien
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Radar Concepts
Institute of Communication and Navigation > Navigation
Deposited By: Kim, Junsu
Deposited On:17 Nov 2017 15:37
Last Modified:31 Jul 2019 20:07

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