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Ionospheric Phase Screen Compensation for the Sentinel-1 TOPS and ALOS-2 ScanSAR Modes

Gomba, Giorgio and Rodriguez Gonzalez, Fernando and De Zan, Francesco (2017) Ionospheric Phase Screen Compensation for the Sentinel-1 TOPS and ALOS-2 ScanSAR Modes. IEEE Transactions on Geoscience and Remote Sensing, 55 (1), pp. 223-235. IEEE - Institute of Electrical and Electronics Engineers. doi: 10.1109/TGRS.2016.2604461. ISSN 0196-2892.

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Official URL: http://ieeexplore.ieee.org/document/7570182/


Variations of the ionosphere can significantly disrupt synthetic aperture radar (SAR) acquisitions and interferometric measurements of ground deformation. In this paper, we show how the ionosphere can also strongly modify C-band interferograms despite its smaller influence at higher frequencies. Thus, ionospheric phase screens should not be neglected: their compensation improves the estimation of ground deformation maps. The split-spectrum method is able to estimate the dispersive ionospheric component of the interferometric phase; we describe the implementation of this method for the burst modes TOPS and ScanSAR to estimate and remove ionospheric phase screens. We present Sentinel-1 interferograms of the 2016 Taiwan earthquake and ALOS-2 interferograms of the 2015 Nepal earthquake, which show strong ionospheric phase gradients, and their corrected versions. Finally, to validate the results and better understand the origin of these ionospheric variations, we compare the estimated differential ionosphere with global Total Electron Content maps and local Global Positioning System measurements

Item URL in elib:https://elib.dlr.de/106496/
Document Type:Article
Title:Ionospheric Phase Screen Compensation for the Sentinel-1 TOPS and ALOS-2 ScanSAR Modes
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Gomba, Giorgiogiorgio.gomba (at) dlr.deUNSPECIFIED
Rodriguez Gonzalez, Fernandofernando.rodriguezgonzales (at) dlr.deUNSPECIFIED
Date:January 2017
Journal or Publication Title:IEEE Transactions on Geoscience and Remote Sensing
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1109/TGRS.2016.2604461
Page Range:pp. 223-235
EditorsEmailEditor's ORCID iD
Plaza, Antonio J.aplaza@unex.esUNSPECIFIED
Publisher:IEEE - Institute of Electrical and Electronics Engineers
Keywords:InSAR, ionosphere estimation, SAR ionospheric effects, split-spectrum
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Vorhaben Tandem-L Vorstudien (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > SAR Signal Processing
Deposited By: Gomba, Giorgio
Deposited On:12 Oct 2016 16:23
Last Modified:08 Mar 2018 18:34

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