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SAR-Techniques



Intensive research is on-going for a new generation of Smart Multi Aperture Radar Techniques (SMART). The main innovative characteristic of this forthcoming generation of SAR systems is the use of multiple elevation and/or azimuth channels combined with Digital Beam-Forming (DBF) capability. This allows for the synthesis of multiple or dynamic digital receiver beams. In general SMART operational modes produce one or more digital receiver beams, each covering an unambiguous range segment on the ground. Utilizing the Digital Beam-Forming (DBF) property of SMART sensors, these receiver beams are actually formed on the recorded echo signal without the necessity for analog beam-forming capabilities. These beams may additionally be scanned in elevation direction to follow the echo on the ground. 

Transmit hardware structure for the generation of independent azimuth waveforms

In the most general sense SMART sensors allow a relaxation of the system design parameters, by increasing the degrees of freedom. Specifically, for a given geometric resolution this results in systems with wider swath, higher signal-to-noise ratio and lower ambiguity-to-signal ratio, all being key requirements on SAR systems, which enable further improvement of the performance; for example an increased swath width can be used to reduce the revisit time and by this enable frequent observations.

Modular performance analysis tool

The key focus of the “SAR-Techniques” Group lie in the translation of SAR requirements (usually beyond those of state-of-the art systems) into a coarse instrument design that is capable of operating innovation imaging modes to fulfil the requirements. The competence of the group lie in the performance estimation of SAR systems utilizing highly advanced techniques and the parallel development of these techniques. Combined with error analysis the performance estimation is also used to advice suitable calibration techniques. This is applied to a broad variety of systems covering planar antenna and reflector-based DBF systems designed for operation at frequencies ranging from P-band to Ka-band. The group is involved in a number of national, European and International projects.

Reflector-based digital beam forming

Contact
Prof. Dr.-Ing. Marwan Younis
Head of the SAR Techniques Group

Microwaves and Radar Institute
, Radar Concepts
Oberpfaffenhofen-Wessling

Tel.: +49 8153 28-2358

Fax: +49 8153 28-1449

Related Projects
Project VABENE (Home)
Projekt VABENE (HR)
Projekt ARGOS (Vorgänger VABENE)
Projekt TRAMRAD (Vorgänger ARGOS)
More Links
DLR Airborne SAR "F-SAR" (current sensor, in operation)
DLR Airborne SAR "E-SAR" (1988 - 2009, out of oper.)
F-SAR Data Format
E-SAR Data Format
DLR Compact Test Range
Pol-InSAR Group
DLR EOWEB
TERENO Project
VABENE++ Project
Event "Rock am Ring"
Multimodal Algorithms
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E-SAR and F-SAR Picture Gallery
Related Topics
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