TY - GEN
T1 - Refocusing of Moving Ship Targets in SAR Images with Long Synthetic Aperture Time
AU - Guo, Jiayi
AU - Yang, Wei
AU - Chen, Jie
AU - Zou, Fei
N1 - Publisher Copyright:
© 2022 IEEE.
PY - 2022
Y1 - 2022
N2 - High-resolution or Medium Earth Orbit (MEO) spaceborne synthetic aperture radar (SAR) system face the problem of long synthetic aperture time. In this case, ship targets with complex angular oscillation motions introduced by sea waves are blurred severely in SAR images. An effective way to refocus targets with rotation movements is inverse synthetic aperture radar (ISAR) technique. However, residual space-variant motion errors after ISAR processing still cause defocusing, especially in heavy sea states. In this paper, a coarse-to-fine refocusing method for moving ship targets is proposed. Firstly, a coarse refocused image is obtained via ISAR technique. Then, a novel space-variant and high-order motion compensation approach is devised to realize fine refocusing. Experiments on real spaceborne SAR data verify the effectiveness of the proposed method.
AB - High-resolution or Medium Earth Orbit (MEO) spaceborne synthetic aperture radar (SAR) system face the problem of long synthetic aperture time. In this case, ship targets with complex angular oscillation motions introduced by sea waves are blurred severely in SAR images. An effective way to refocus targets with rotation movements is inverse synthetic aperture radar (ISAR) technique. However, residual space-variant motion errors after ISAR processing still cause defocusing, especially in heavy sea states. In this paper, a coarse-to-fine refocusing method for moving ship targets is proposed. Firstly, a coarse refocused image is obtained via ISAR technique. Then, a novel space-variant and high-order motion compensation approach is devised to realize fine refocusing. Experiments on real spaceborne SAR data verify the effectiveness of the proposed method.
KW - inverse synthetic aperture radar (ISAR)
KW - refocusing
KW - ship target
KW - space-variant motion compensation
KW - Synthetic aperture radar (SAR)
UR - https://www.scopus.com/pages/publications/85140407669
U2 - 10.1109/IGARSS46834.2022.9883546
DO - 10.1109/IGARSS46834.2022.9883546
M3 - 会议稿件
AN - SCOPUS:85140407669
T3 - International Geoscience and Remote Sensing Symposium (IGARSS)
SP - 2079
EP - 2082
BT - IGARSS 2022 - 2022 IEEE International Geoscience and Remote Sensing Symposium
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2022 IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2022
Y2 - 17 July 2022 through 22 July 2022
ER -