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MIMO-SAR: Opportunities and Pitfalls

Krieger, Gerhard (2014) MIMO-SAR: Opportunities and Pitfalls. IEEE Transactions on Geoscience and Remote Sensing, 52 (5), pp. 2628-2645. IEEE - Institute of Electrical and Electronics Engineers. doi: 10.1109/TGRS.2013.2263934. ISSN 0196-2892.

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This paper reviews advanced radar architectures that employ multiple transmit and multiple receive antennas to improve the performance of future 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 channels. 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 challenge, a new class of short-term shift-orthogonal waveforms is introduced. The short-term shift orthogonality avoids mutual interferences from the radar echoes of closely spaced scatterers, while interferences from more distant scatterers are suppressed by digital beamforming on receive in elevation. Further insights can be gained by considering the data acquisition of a side-looking imaging radar in a three-dimensional information cube. It becomes evident that the suggested waveforms fill different subspaces that can be individually accessed by a multi-channel receiver. For completeness, the new class of short-term shift-orthogonal waveforms is also compared to a recently proposed pair of OFDM waveforms. It is shown that both sets of waveforms require essentially the same principle of range time to elevation angle conversion via a multi-channel receiver in order to be applicable for MIMO-SAR imaging without interference.

Item URL in elib:https://elib.dlr.de/82373/
Document Type:Article
Title:MIMO-SAR: Opportunities and Pitfalls
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Krieger, GerhardUNSPECIFIEDhttps://orcid.org/0000-0002-4548-0285UNSPECIFIED
Date:May 2014
Journal or Publication Title:IEEE Transactions on Geoscience and Remote Sensing
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 2628-2645
Publisher:IEEE - Institute of Electrical and Electronics Engineers
Keywords:Multiple-Input Multiple-Output Synthetic Aperture Radar (MIMO-SAR), Multidimensional Waveform Encoding, Digital Beamforming (DBF), Orthogonal Frequency-Division Multiplexing (OFDM)
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
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Radar Concepts
Microwaves and Radar Institute
Deposited By: Krieger, Dr.-Ing. Gerhard
Deposited On:15 May 2013 15:33
Last Modified:06 Nov 2023 14:20

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