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Toward Operational Compensation of Ionospheric Effects in SAR Interferograms: The Split-Spectrum Method

Gomba, Giorgio and Parizzi, Alessandro and De Zan, Francesco and Eineder, Michael and Bamler, Richard (2016) Toward Operational Compensation of Ionospheric Effects in SAR Interferograms: The Split-Spectrum Method. IEEE Transactions on Geoscience and Remote Sensing, 54 (3), pp. 1446-1461. IEEE - Institute of Electrical and Electronics Engineers. DOI: 10.1109/TGRS.2015.2481079 ISSN 0196-2892

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Official URL: http://ieeexplore.ieee.org/xpl/articleDetails.jsp?reload=true&arnumber=7308047

Abstract

The differential ionospheric path delay is a major error source in L-band interferograms. It is superimposed to topography and ground deformation signals, hindering the measurement of geophysical processes. In this paper, we proceed toward the realization of an operational processor to compensate the ionospheric effects in interferograms. The processor should be robust and accurate to meet the scientific requirements for the measurement of geophysical processes, and it should be applicable on a global scale. An implementation of the split-spectrum method, which will be one element of the processor, is presented in detail, and its performance is analyzed. The method is based on the dispersive nature of the ionosphere and separates the ionospheric component of the interferometric phase from the nondispersive component related to topography, ground motion, and tropospheric path delay. We tested the method using various Advanced Land Observing Satellite Phased-Array type L-band synthetic aperture radar interferometric pairs with different characteristics: high to low coherence, moving and nonmoving terrains, with and without topography, and different ionosphere states. Ionospheric errors of almost 1 m have been corrected to a centimeter or a millimeter level. The results show how the method is able to systematically compensate the ionospheric phase in interferograms, with the expected accuracy, and can therefore be a valid element of the operational processor.

Item URL in elib:https://elib.dlr.de/99275/
Document Type:Article
Title:Toward Operational Compensation of Ionospheric Effects in SAR Interferograms: The Split-Spectrum Method
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Gomba, Giorgiogiorgio.gomba (at) dlr.deUNSPECIFIED
Parizzi, AlessandroUNSPECIFIEDUNSPECIFIED
De Zan, FrancescoUNSPECIFIEDUNSPECIFIED
Eineder, MichaelUNSPECIFIEDUNSPECIFIED
Bamler, RichardUNSPECIFIEDUNSPECIFIED
Date:2016
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:54
DOI :10.1109/TGRS.2015.2481079
Page Range:pp. 1446-1461
Editors:
EditorsEmail
Plaza, Antonio J.aplaza@unex.es
Publisher:IEEE - Institute of Electrical and Electronics Engineers
ISSN:0196-2892
Status:Published
Keywords:ionosphere, insar
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:Remote Sensing Technology Institute > SAR Signal Processing
Deposited By: Gomba, Giorgio
Deposited On:17 Nov 2015 08:41
Last Modified:31 Jul 2019 19:56

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