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Multichannel Azimuth Processing in ScanSAR and TOPS Mode Operation

Gebert, Nicolas and Krieger, Gerhard and Moreira, Alberto (2010) Multichannel Azimuth Processing in ScanSAR and TOPS Mode Operation. IEEE Transactions on Geoscience and Remote Sensing, 48 (7), pp. 2994-3008. DOI: 10.1109/TGRS.2010.2041356. ISSN 0196-2892.

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Official URL: http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5438817

Abstract

Due to a system-inherent limitation, conventional synthetic aperture radar (SAR) is incapable of imaging a wide swath with high geometric resolution. This restriction can be overcome by systems with multiple receive channels in combination with an additional digital signal processing network. So far, the application of such digital beamforming algorithms for highresolution wide-swath SAR imaging has been restricted to multichannel systems in stripmap operation. However, in stripmap mode, the overall azimuth antenna length restricts the achievable swath width, thus preventing very wide swaths as requested by future SAR missions. Consequently, new concepts for ultrawideswath imaging are needed. A promising candidate is a SAR system with multiple azimuth channels being operated in burst mode. This paper analyzes innovative ScanSAR and Terrain Observation by Progressive Scans (TOPS) system concepts with regard to multichannel azimuth processing. For this, the theoretical analyses, performance figures, and SAR signal processing, which ad previously been derived for multichannel stripmap mode, are extended to systems operating in burst modes. The investigations reveal that multichannel ScanSAR systems enable the imaging of ultrawide swaths with high azimuth resolution and compact antenna lengths. These considerations are embedded in a multichannel ScanSAR system design example to demonstrate its capability to image an ultrawide swath of 400 km with a high geometric resolution of 5 m. In a next step, this system is adapted to TOPS mode operation, including an innovative �staircase� multichannel processing approach optimized for TOPS.

Document Type:Article
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Title:Multichannel Azimuth Processing in ScanSAR and TOPS Mode Operation
Authors:
AuthorsInstitution or Email of Authors
Gebert, NicolasUNSPECIFIED
Krieger, GerhardUNSPECIFIED
Moreira, AlbertoUNSPECIFIED
Date:July 2010
Journal or Publication Title:IEEE Transactions on Geoscience and Remote Sensing
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:48
DOI:10.1109/TGRS.2010.2041356
Page Range:pp. 2994-3008
Editors:
EditorsEmail
IEEE, UNSPECIFIED
ISSN:0196-2892
Status:Published
Keywords:Multi-channel azimuth processing, high-resolution ultra-wide-swath SAR imaging, multi-channel burst-mode operation, ScanSAR, TOPS, digital beamforming on receive
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:10 Jan 2011 19:22
Last Modified:12 Dec 2013 21:12

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