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Impact of TEC Gradients and Higher-Order Ionospheric Disturbances on Spaceborne Single-Pass SAR Interferometry

Krieger, Gerhard and De Zan, Francesco and Lopez-Dekker, Paco and Kim, Jun Su and Rodriguez Cassola, Marc and Moreira, Alberto (2015) Impact of TEC Gradients and Higher-Order Ionospheric Disturbances on Spaceborne Single-Pass SAR Interferometry. In: IEEE International Geoscience and Remote Sensing Symposium (IGARSS), pp. 4061-4064. International Geoscience and Remote Sensing Symposium (IGARSS) 2015, 2015-07-26 - 2015-07-31, Milan,Italy.

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Abstract

This paper analyzes the impact of a spatially inhomogeneous ionosphere on spaceborne single-pass SAR interferometry. For this, linear TEC gradients and higher-order irregularities are considered. It is shown that TEC gradients as low as 0.01 TECU/km may already noticeably affect the accuracy of an L-band cross-track interferometer, causing, e.g., horizontal and vertical offsets in the order of 1-2 m. Higher-order perturbations of the electron plasma lead to additional errors that vary nonlinearly with the length of the interferometric baseline. To predict these errors, we model the ionospheric irregularities as the product of a vertical profile and a second-order stationary stochastic process with a 3-D power-law spectrum. The interferometric errors are then derived via a set of projection integrals that express the expected phase error variance as a function of the baseline length and the angular extent of the synthetic aperture. With this model, we show that the phase errors of an L-band single-pass SAR interferometer may reach several tens of degrees under medium turbulence conditions. Since these phase errors are highly correlated among neighboring resolution cells, they cannot be reduced by multi-looking, thereby posing a possible challenge for multiple baseline interferometry and SAR tomography.

Item URL in elib:https://elib.dlr.de/95065/
Document Type:Conference or Workshop Item (Speech)
Title:Impact of TEC Gradients and Higher-Order Ionospheric Disturbances on Spaceborne Single-Pass SAR Interferometry
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Krieger, GerhardUNSPECIFIEDUNSPECIFIED
De Zan, FrancescoUNSPECIFIEDUNSPECIFIED
Lopez-Dekker, PacoUNSPECIFIEDUNSPECIFIED
Kim, Jun SuUNSPECIFIEDUNSPECIFIED
Rodriguez Cassola, MarcUNSPECIFIEDUNSPECIFIED
Moreira, AlbertoUNSPECIFIEDUNSPECIFIED
Date:26 July 2015
Journal or Publication Title:IEEE International Geoscience and Remote Sensing Symposium (IGARSS)
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:Yes
Page Range:pp. 4061-4064
Status:Published
Keywords:ionosphere, scintillation, SAR interferometry, turbulence, TEC gradient
Event Title:International Geoscience and Remote Sensing Symposium (IGARSS) 2015
Event Location:Milan,Italy
Event Type:international Conference
Event Dates:2015-07-26 - 2015-07-31
Organizer:IEEE
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
Microwaves and Radar Institute > SAR Technology
Microwaves and Radar Institute > Spaceborne SAR Systems
Microwaves and Radar Institute
Deposited By: Krieger, Dr.-Ing. Gerhard
Deposited On:05 Feb 2015 08:35
Last Modified:31 Jul 2019 19:51

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