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Moving Target Relative Speed Estimation and Refocusing in Synthetic Aperture Radar Images
Blekinge Institute of Technology, School of Engineering, Department of Signal Processing.
Blekinge Institute of Technology, School of Engineering, Department of Signal Processing.
Blekinge Institute of Technology, School of Engineering, Department of Signal Processing.ORCID iD: 0000-0002-6643-312X
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2012 (English)In: IEEE Transactions on Aerospace and Electronic Systems, ISSN 0018-9251, E-ISSN 1557-9603, Vol. 48, no 3, 2426-2436 p.Article in journal (Refereed) Published
Abstract [en]

In this paper, a method for moving target relative speed estimation and refocusing based on synthetic aperture radar (SAR) images is derived and tested in simulation and on real data with good results. Furthermore, an approach on how to combine the estimation method with the refocusing method is introduced. The estimation is based on a chirp estimator that operates in the SAR image and the refocusing of the moving target is performed locally using subimages. Focusing of the moving target is achieved in the frequency domain by phase compensation, and therefore makes it even possible to handle large range cell migration in the SAR subimages. The proposed approach is tested in a simulation and also on real ultrawideband (UWB) SAR data with very good results. The estimation method works especially well in connection with low frequency (LF) UWB SAR, where the clutter is well focused and the phase of the smeared moving target signal becomes less distorted. The main limitation of the approach is target accelerations where the distortion increases with the integration time.

Place, publisher, year, edition, pages
IEEE , 2012. Vol. 48, no 3, 2426-2436 p.
Keyword [en]
WIDE-BAND SAR, PARAMETER-ESTIMATION, CALIBRATION, OBJECTS
National Category
Signal Processing
Identifiers
URN: urn:nbn:se:bth-7048DOI: 10.1109/TAES.2012.6237601ISI: 000306517100037Local ID: oai:bth.se:forskinfo2A65EA3C2A5EBE26C1257AC40047C6DEOAI: oai:DiVA.org:bth-7048DiVA: diva2:834624
Available from: 2013-01-07 Created: 2012-11-28 Last updated: 2017-03-16Bibliographically approved

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