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Efficient Autofocus Chain for ISAR Imaging of Non-Uniformly Rotating Target

Title
Efficient Autofocus Chain for ISAR Imaging of Non-Uniformly Rotating Target
Authors
Kang, Byung-SooKang, Min-SeokChoi, In-OhKim, Chan-HongKim, Kyung-Tae
POSTECH Authors
Kim, Kyung-Tae
Date Issued
Sep-2017
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Abstract
Conventional approaches to inverse synthetic aperture radar (ISAR) imaging of a non-uniformly rotating target are not optimal in terms of reconstructed image quality and/or computation time. Motivated by the problems of conventional approaches, we introduce an efficient autofocus chain for ISAR imaging of a non-uniformly rotating target. The most distinct feature of the proposed autofocus chain is found in the processing sequence to compensate for the phase error induced by the translational and rotational motion (RM) of the target. In contrast to conventional approaches, RM compensation is first implemented in the proposed autofocus chain immediately after range-alignment. Next, further focusing of the ISAR image is performed by estimating the residual phase errors, providing globally well-focused ISAR images. From the experimental results using real data sets, we can conclude that the proposed autofocus chain is highly efficient in forming ISAR images of a non-uniformly rotating target in terms of both image quality and computational efficiency.
Keywords
JOINT-TIME-FREQUENCY; POLYNOMIAL-PHASE TRANSFORM; MOTION COMPENSATION; MANEUVERING TARGETS; ALGORITHM; IMAGES
URI
http://oasis.postech.ac.kr/handle/2014.oak/50974
DOI
10.1109/JSEN.2017.2727507
ISSN
1530-437X
Article Type
Article
Citation
IEEE SENSORS JOURNAL, vol. 17, no. 17, page. 5466 - 5478, 2017-09
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 KIM, KYUNG TAE
Dept of Electrical Enginrg
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