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Combined MAM-PCA autofocus for stripmap SAR

Afroz, Rifat and Ng, Brian and Abbott, Derek and Scheiber, Rolf (2022) Combined MAM-PCA autofocus for stripmap SAR. In: Proceedings International Radar Symposium, pp. 16-20. International Radar Symposium (IRS), 2022-09-12 - 2022-09-14, Gdansk, Poland. ISBN 978-839560205-4. ISSN 2155-5753.

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Abstract

The nonparametric phase curvature algorithm (PCA) is commonly used to estimate residual motion error in stripmap SAR. The algorithm is capable of estimating second and higher order errors, as well as high frequency errors. However, its dependence on dominant scatterers restricts its application to a wide variety of scenes. Such a limitation is encountered in focusing a polarimetric L-band SAR dataset collected from an agricultural field. The lack of dominant scatterers in the scene results in inaccurate error estimation when PCA is applied directly. Another autofocus scheme, the Multi-aperture Mapdrift (MAM), is used first to eliminate the low order motion errors. This improves the focusing quality of the existing targets. The enhanced point targets are then suitable for PCA to remove the remaining higher order motion errors. The novel MAM-PCA combination significantly improves the image contrast compared to that obtained from the approaches applied separately. Point target based comparison of MAM, PCA and MAM-PCA show that the proposed technique improves the overall quality of the target profile.

Item URL in elib:https://elib.dlr.de/190683/
Document Type:Conference or Workshop Item (Speech)
Title:Combined MAM-PCA autofocus for stripmap SAR
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Afroz, RifatThe University of AdelaideUNSPECIFIED
Ng, BrianThe University of AdelaideUNSPECIFIED
Abbott, DerekThe University of AdelaideUNSPECIFIED
Scheiber, RolfUNSPECIFIEDhttps://orcid.org/0000-0002-6833-4897
Date:12 September 2022
Journal or Publication Title:Proceedings International Radar Symposium
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Page Range:pp. 16-20
ISSN:2155-5753
ISBN:978-839560205-4
Status:Published
Keywords:SAR, autofocus
Event Title:International Radar Symposium (IRS)
Event Location:Gdansk, Poland
Event Type:international Conference
Event Dates:2022-09-12 - 2022-09-14
Organizer:Microwave and Radiolocation Foundation, Poland
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Aircraft SAR
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > SAR Technology
Deposited By: Scheiber, Dr.-Ing. Rolf
Deposited On:24 Nov 2022 06:30
Last Modified:30 Dec 2022 14:51

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