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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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Abstract

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
Additional Information:�©2009 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. This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.
Title:Azimuth Phase Center Adaptation on Transmit for High-Resolution Wide-Swath SAR Imaging
Authors:
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 SCOPUS:Yes
In ISI Web of Science:Yes
Volume:6
Page Range:pp. 782-786
Editors:
EditorsEmail
IEEE, UNSPECIFIED
Status:Published
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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