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Azimuth Phase Center Adaptation on Transmit for High-Resolution Wide-Swath SAR Imaging

Gebert, Nicolas and Krieger, Gerhard (2009) Azimuth Phase Center Adaptation on Transmit for High-Resolution Wide-Swath SAR Imaging. IEEE Geoscience and Remote Sensing Letters, 6 (4), pp. 782-786.

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Synthetic aperture radar (SAR) systems with multiple receive channels allow for high-resolution wide-swath imaging thus overcoming a fundamental limitation of conventional single-aperture SAR. By using multiple apertures in azimuth, additional samples are received for each transmitted pulse. This allows for a reduced pulse repetition frequency (PRF) thereby enabling a wider swath. However, a non-optimum PRF is associated with a non-uniform sample spacing in azimuth and needs to be compensated by a multi-channel reconstruction algorithm. For strong deviations from the optimum PRF, the inverse character of such an algorithm might result in a degraded performance. This can be overcome by an innovative advanced transmit antenna architecture which allows for a pulse-to-pulse shift of the phase center. Such an antenna enables the adaptive adjustment of the system�s phase center positions to the respective PRF, by this ensuring constant performance over a clearly extended PRF range. Especially in combination with conventional multi-channel processing strategies this technique represents the next step towards a fully active Multiple-Input Multiple-Output (MIMO) SAR and has a great potential for future systems.

Document Type:Article
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Title:Azimuth Phase Center Adaptation on Transmit for High-Resolution Wide-Swath SAR Imaging
AuthorsInstitution or Email of Authors
Gebert, NicolasUNSPECIFIED
Krieger, GerhardUNSPECIFIED
Date:October 2009
Journal or Publication Title:IEEE Geoscience and Remote Sensing Letters
Refereed publication:Yes
In Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 782-786
Keywords:Optimized multi-channel azimuth processing, high-resolution wide-swath SAR, digital beamforming on receive, phase center adaptation
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: Nicolas Gebert
Deposited On:24 Mar 2009
Last Modified:12 Dec 2013 20:37

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