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MIMO-SAR and the Orthogonality Confusion

Krieger, Gerhard and Younis, Marwan and Huber, Sigurd and Bordoni, Federica and Patyuchenko, Anton and Kim, Junghyo and Laskowski, Piotr and Villano, Michealangelo and Rommel, Tobias and Lopez-Dekker, Paco and Moreira, Alberto (2012) MIMO-SAR and the Orthogonality Confusion. In: Proceedings of IEEE International Geoscience and Remote Sensing Symposium (IGARSS), pp. 1-4. IEEE. IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2012-07-22 - 2012-07-27, Munich, Germany.

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This paper reviews radar architectures that employ multiple transmit and multiple receive channels to improve the performance of synthetic aperture radar (SAR) systems. These advanced architectures have been dubbed multiple-input multiple-output SAR (MIMO-SAR) in analogy to MIMO communication systems. Considerable confusion arose, however, with regard to the selection of suitable waveforms for the simultaneous transmission via multiple antennas. In this paper, it is shown that the mere use of orthogonal waveforms is insufficient for the desired performance improvement in view of most SAR applications. As a solution to this fundamental MIMO-SAR problem we had previously suggested to exploit the special data acquisition geometry of a side-looking imaging radar equipped with multiple receiver channels in addition to appropriately designed waveforms transmitted by multiple antennas. Here, we extend this approach to a more general set of radar waveforms with special correlation properties that satisfy a short-term shift-orthogonality condition. We show that the echoes from simultaneously transmitted pulses can be separated if the short-term shift orthogonality is combined with digital beamforming on receive in elevation. This enables the implementation of a fully functional MIMO-SAR without correlation noise leakage for extended scattering scenarios.

Document Type:Conference or Workshop Item (Speech)
Additional Information:Copyright:(c) 2012 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Title:MIMO-SAR and the Orthogonality Confusion
AuthorsInstitution or Email of Authors
Krieger, GerhardUNSPECIFIED
Bordoni, FedericaUNSPECIFIED
Patyuchenko, AntonUNSPECIFIED
Laskowski, PiotrUNSPECIFIED
Villano, MichealangeloUNSPECIFIED
Lopez-Dekker, PacoUNSPECIFIED
Moreira, AlbertoUNSPECIFIED
Date:26 July 2012
Journal or Publication Title:Proceedings of IEEE International Geoscience and Remote Sensing Symposium (IGARSS)
Refereed publication:Yes
In ISI Web of Science:No
Page Range:pp. 1-4
Keywords:Digital Beamforming, MIMO-SAR, OFDM
Event Title:IEEE International Geoscience and Remote Sensing Symposium (IGARSS)
Event Location:Munich, Germany
Event Type:international Conference
Event Dates:2012-07-22 - 2012-07-27
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Entwicklung eines Mini-SAR (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Radar Concepts
Microwaves and Radar Institute
Deposited By: Dr.-Ing. Gerhard Krieger
Deposited On:13 Aug 2012 10:50
Last Modified:08 May 2014 23:23

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