TY - GEN
T1 - Refined High-Resolution Ship Target ISAR Imaging Method Based on Fractional Fourier Transform
AU - Li, Junyan
AU - Yang, Qing
AU - Zhong, Shen
AU - Li, Zhongyu
AU - Wu, Junjie
AU - Yang, Jianyu
N1 - Publisher Copyright:
© 2024 IEEE.
PY - 2024
Y1 - 2024
N2 - High-resolution ship Inverse Synthetic Aperture Radar (ISAR) imaging is vital for identifying ship targets by revealing their contours and detailed features. However, the spatial-variant Doppler frequency caused by unknown motion parameters often leads to defocused ISAR images. Traditional Fourier-Transform-based methods struggle to handle the three-dimensional spatial-variant Doppler frequency (3-D SVDF). CLEAN-based methods, capable of estimating 3-D SVDF, often sacrifice target details. To overcome these hurdles, this paper proposes a refined ship ISAR imaging method based on Fractional Fourier Transform (FRFT). Employing FRFT, the method estimates multiple Doppler parameters and segregates scattering points into spatial-invariant sub-images based on their Doppler similarity. Phase compensation is then applied to each sub-image, enabling compensation for ship motion and extracting detailed ship target information in high-resolution ISAR images. Simulation results affirm the algorithm's efficiency in achieving image focusing and revealing intricate ship target details.
AB - High-resolution ship Inverse Synthetic Aperture Radar (ISAR) imaging is vital for identifying ship targets by revealing their contours and detailed features. However, the spatial-variant Doppler frequency caused by unknown motion parameters often leads to defocused ISAR images. Traditional Fourier-Transform-based methods struggle to handle the three-dimensional spatial-variant Doppler frequency (3-D SVDF). CLEAN-based methods, capable of estimating 3-D SVDF, often sacrifice target details. To overcome these hurdles, this paper proposes a refined ship ISAR imaging method based on Fractional Fourier Transform (FRFT). Employing FRFT, the method estimates multiple Doppler parameters and segregates scattering points into spatial-invariant sub-images based on their Doppler similarity. Phase compensation is then applied to each sub-image, enabling compensation for ship motion and extracting detailed ship target information in high-resolution ISAR images. Simulation results affirm the algorithm's efficiency in achieving image focusing and revealing intricate ship target details.
KW - Doppler frequency estimation
KW - FRFT
KW - Ship targets
KW - high-resolution ISAR imaging
KW - spatial-variant phase compensation
UR - https://www.scopus.com/pages/publications/85204924939
U2 - 10.1109/IGARSS53475.2024.10640934
DO - 10.1109/IGARSS53475.2024.10640934
M3 - 会议稿件
AN - SCOPUS:85204924939
T3 - International Geoscience and Remote Sensing Symposium (IGARSS)
SP - 10541
EP - 10545
BT - IGARSS 2024 - 2024 IEEE International Geoscience and Remote Sensing Symposium, Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2024 IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2024
Y2 - 7 July 2024 through 12 July 2024
ER -