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MIMO-SAR Tomography

Krieger, Gerhard and Rommel, Tobias and Moreira, Alberto (2016) MIMO-SAR Tomography. In: Proceedings of the 11th European Conference on Synthetic Aperture Radar (EUSAR), pp. 91-96. VDE. European Conference on Synthetic Aperture Radar (EUSAR), 2016-06-06 - 2016-06-09, Hamburg, Germany. ISBN 978-3-8007-4228-8. ISSN 2197-4403.

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MIMO SAR employs multiple transmit and receive channels to improve the imaging performance and to acquire novel geo-information products. One example is SAR tomography, where the simultaneous transmission and reception with multiple antennas can provide a large number of baselines with a small number of antennas. In the limit, an appropriately designed MIMO-SAR configuration with N_Tx transmitters and N_Rx receivers can provide in total N_Tx∙N_Rx independent phase centers and therefore N_Tx∙N_Rx-1 independent baselines for SAR tomography. The other extreme is provided by uniform linear arrays with co-located transmitters and receivers. Such configurations are characterized by a large number of overlapping effective phase centers and are therefore regarded as highly redundant. In this paper, we will show that such a redundancy is nevertheless well suited to resolve an inherent challenge of conventional SAR tomography, which is limited in providing unambiguous 3-D scatterer position estimates in case of multiple scattering. For this, we show that redundant MIMO arrays allow not only an a posteriori beamforming on receive, but, at the same time, also a comparable a posteriori (i.e. after data acquisition) beamforming on transmit. This means that one can emulate, from one and the same recorded MIMO-SAR data set, different illumination scenarios on transmit and receive. By evaluating the 2-D spectrum provided by the independent Tx and Rx beams, it becomes then possible to differentiate between single- and multiple-bounce scattering. The separation between single- and double-bounce scattering has also been successfully demonstrated in a ground-based radar experiment and is presented in another EUSAR paper.

Item URL in elib:https://elib.dlr.de/104701/
Document Type:Conference or Workshop Item (Speech)
Title:MIMO-SAR Tomography
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Krieger, GerhardUNSPECIFIEDhttps://orcid.org/0000-0002-4548-0285UNSPECIFIED
Rommel, TobiasUNSPECIFIEDhttps://orcid.org/0000-0003-1864-7585UNSPECIFIED
Moreira, AlbertoUNSPECIFIEDhttps://orcid.org/0000-0002-3436-9653UNSPECIFIED
Date:June 2016
Journal or Publication Title:Proceedings of the 11th European Conference on Synthetic Aperture Radar (EUSAR)
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 91-96
Keywords:MIMO-SAR, tomography, interferometry, single-pass, repeat-pass, single bounce, double bounce, scattering
Event Title:European Conference on Synthetic Aperture Radar (EUSAR)
Event Location:Hamburg, Germany
Event Type:international Conference
Event Start Date:6 June 2016
Event End Date:9 June 2016
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 - Development of a mini-SAR, R - SAR missions, R - SAR methods, R - SAR Expert Support Lab
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Radar Concepts
Deposited By: Krieger, Dr.-Ing. Gerhard
Deposited On:17 Jun 2016 08:01
Last Modified:24 Apr 2024 20:10

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