Ship Target Imaging in Airborne SAR System Based on Automatic Image Segmentation and ISAR Technique

The airborne synthetic aperture radar (SAR) image of ship target will be blurred for the complex motion of the target, which will influence the performance of feature extraction and target classification. In this article, a refocusing method of ship target in airborne SAR image though the inverse sy...

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Bibliographic Details
Published in:IEEE journal of selected topics in applied earth observations and remote sensing 2021, Vol.14, p.1985-2000
Main Authors: Cao, Rui, Wang, Yong, Zhao, Bin, Lu, Xiaofei
Format: Article
Language:English
Subjects:
Airborne radar
Airborne remote sensing
Algorithms
Automatic image segmentation
Clustering
clustering algorithm
Doppler sonar
Feature extraction
hierarchical cluster algorithm (HCA)
Image processing
Image segmentation
Imaging
Imaging techniques
Inverse synthetic aperture radar
inverse synthetic aperture radar (ISAR) refocusing
Labour
Marine vehicles
Radar
Radar imaging
Radar polarimetry
SAR (radar)
ship target
Ships
Signal processing
Synthetic aperture radar
synthetic aperture radar (SAR)
Target recognition
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Summary:The airborne synthetic aperture radar (SAR) image of ship target will be blurred for the complex motion of the target, which will influence the performance of feature extraction and target classification. In this article, a refocusing method of ship target in airborne SAR image though the inverse synthetic aperture radar (ISAR) technique is presented. The novel contributions of this article can be summarized as follows: 1) the residual phase of processed signal is analyzed in detail to illustrate the necessity of adopting ISAR technique; 2) a valid, labor-saving, and automatic image segmentation approach via clustering algorithm is put forward for automatic data extraction and inverse mapping. The clustering algorithm we choose is the agglomerative hierarchical cluster algorithm, which does not require the number of categories in advance; 3) the refocused individual ISAR image of individual ship target is yielded though the range-instantaneous Doppler algorithm. Finally, the simulated and real measured data are processed, and imaging results verify the effectiveness of the novel algorithm presented in this article.
ISSN:1939-1404
2151-1535
DOI:10.1109/JSTARS.2021.3050108