Moving Target Relative Speed Estimation and Refocusing in Synthetic Aperture Radar Images

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 int...

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Bibliographic Details
Published in:IEEE transactions on aerospace and electronic systems 2012-07, Vol.48 (3), p.2426-2436
Main Authors: Sjogren, T. K., Vu, V. T., Pettersson, M. I., Gustavsson, A., Ulander, L. M. H.
Format: Article
Language:English
Subjects:
Acceleration
Approximation methods
Azimuth
CALIBRATION
Cell adhesion & migration
Clutter
Compensation
Distortion
Estimation
Focusing
Image resolution
Moving targets
OBJECTS
PARAMETER-ESTIMATION
Simulation
Studies
Synthetic aperture radar
WIDE-BAND SAR
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Summary: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.
ISSN:0018-9251
1557-9603
1557-9603
DOI:10.1109/TAES.2012.6237601