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Detection and Mitigation of Strong Azimuth Ambiguities in High Resolution SAR Images

Scheiber, Rolf and Jäger, Marc (2016) Detection and Mitigation of Strong Azimuth Ambiguities in High Resolution SAR Images. VDE. European Conference on Synthetic Aperture Radar (EUSAR), 2016-06-06 - 2016-06-09, Hamburg, Germany. ISBN 978-3-8007-4228-8 ISSN 2197-4403

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Abstract

Azimuth ambiguities of bright point-like targets become more pronounced in case of high resolution SAR imaging. When improving the spatial resolution, the compression gain in SAR image formation becomes larger, which increases the dynamic range of SAR images. The increased point target intensity also implies a correspondingly higher azimuth ambiguity power, which often exceeds the reflectivity of the surrounding homogeneous areas. This paper proposes a new approach to identifying and mitigating azimuth ambiguities of bright targets within areas of distributed homogeneous backscattering. The method makes use of two independent range looks. While the main signal in the two looks is considered nearly identical, the ambiguous signal becomes mis-registered, i.e. the azimuth position shifts as a function of the range look center frequency. This property is used to derive a suitable mitigation approach. It is tested with X-band data acquired by DLR’s F-SAR sensor in step-frequency mode.

Item URL in elib:https://elib.dlr.de/103678/
Document Type:Conference or Workshop Item (Speech, Poster)
Title:Detection and Mitigation of Strong Azimuth Ambiguities in High Resolution SAR Images
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Scheiber, RolfUNSPECIFIEDUNSPECIFIED
Jäger, MarcUNSPECIFIEDUNSPECIFIED
Date:6 June 2016
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 463-466
Publisher:VDE
ISSN:2197-4403
ISBN:978-3-8007-4228-8
Status:Published
Keywords:ambiguities, synthetic aperture radar (SAR)
Event Title:European Conference on Synthetic Aperture Radar (EUSAR)
Event Location:Hamburg, Germany
Event Type:international Conference
Event Dates:2016-06-06 - 2016-06-09
Organizer:VDE
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Flugzeug-SAR
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > SAR Technology
Deposited By: Scheiber, Dr.-Ing. Rolf
Deposited On:01 Apr 2016 09:18
Last Modified:31 Jul 2019 20:00

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