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Coherence-based SAR tomography for spaceborne applications

Nannini, Matteo and Martone, Michele and Rizzoli, Paola and Prats, Pau and Rodriguez Cassola, Marc and Reigber, Andreas and Moreira, Alberto (2019) Coherence-based SAR tomography for spaceborne applications. Remote Sensing of Environment. Elsevier. ISSN 0034-4257

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Abstract

Future SAR missions will provide three-dimensional images of semi-transparent media, such as vegetation and ice, through SAR tomography. Access to information on the internal structure of these volume scatterers is a key factor for a better understanding of ecosystem dynamics and climate change. Because of this, several concepts are nowadays examined to implement SAR tomography in a spaceborne framework. In order to do that, it is necessary to gather different observations of the area of interest. Unfortunately, a consequence of the time that elapses between acquisitions is that the electromagnetic properties of the medium may vary. This implies that, there may be inconsistencies in the acquired data, leading to errors in the final inversion. A solution to partially cope with this temporal decorrelation, is to acquire data employing two or more sensors operating with a reduced (or even absent) temporal gap and then to collect several acquisitions at different time instants. By means of this imaging concept, the required line-of-sight diversity is granted and the desired resolution in the height direction ensured. In this way, sets of temporal decorrelation-free interferometric coherences can be built and the vertical scattering profile can be retrieved via coherence-based tomography. This contribution analyses a two-sensor system like TanDEM-X, Tandem-L , or SAOCOM-CS. In particular, the potential of coherence-based tomography are shown with data acquired with the TanDEM-X sensors for boreal and Amazon forest. In addition, a technique to partially cope with temporal decorrelation through covariance matrix filtering is also presented in the paper.

Item URL in elib:https://elib.dlr.de/127009/
Document Type:Article
Title:Coherence-based SAR tomography for spaceborne applications
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Nannini, MatteoMatteo.Nannini (at) dlr.deUNSPECIFIED
Martone, MicheleMichele.Martone (at) dlr.dehttps://orcid.org/0000-0002-4601-6599
Rizzoli, PaolaPaola.Rizzoli (at) dlr.dehttps://orcid.org/0000-0001-9118-2732
Prats, PauPau.Prats (at) dlr.dehttps://orcid.org/0000-0002-7583-2309
Rodriguez Cassola, MarcMarc.Rodriguez (at) dlr.deUNSPECIFIED
Reigber, AndreasAndreas.Reigber (at) dlr.dehttps://orcid.org/0000-0002-2118-5046
Moreira, AlbertoAlberto.Moreira (at) dlr.dehttps://orcid.org/0000-0002-3436-9653
Date:March 2019
Journal or Publication Title:Remote Sensing of Environment
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Publisher:Elsevier
ISSN:0034-4257
Status:Published
Keywords:Synthetic Aperture Radar (SAR), SAR Tomography, Companion Satellites, Bi-static SAR, Volume Scatterers, Vegetation.
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 Flugzeug-SAR
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > SAR Technology
Microwaves and Radar Institute > Spaceborne SAR Systems
Deposited By: Nannini, Matteo
Deposited On:04 Apr 2019 08:51
Last Modified:31 Jul 2019 20:24

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