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

Document type: Journal Articles
Article type: Original article
Peer reviewed: Yes
Full text:
Author(s): Tomas Sjögren, Viet Vu, Mats Pettersson, Anders Gustavsson, Lars Ulander
Title: Moving Target Relative Speed Estimation and Refocusing in Synthetic Aperture Radar Images
Journal: IEEE transactions on aerospace and electronic systems
Year: 2012
Volume: 48
Issue: 3
Pagination: 2426-2436
ISSN: 0018-9251
Publisher: IEEE
URI/DOI: 10.1109/TAES.2012.6237601
ISI number: 000306517100037
Organization: Blekinge Institute of Technology
Department: School of Engineering - Dept. of Signal Processing (Sektionen för teknik – avd. för signalbehandling)
School of Engineering S- 372 25 Ronneby
+46 455 38 50 00
Language: English
Abstract: 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.
Subject: Signal Processing\Radar and Sonar