An Aperture Selection Method for ISAR imaging of Ship Targets under Long-Term High Sea States

TY - JOUR

T1 - An Aperture Selection Method for ISAR imaging of Ship Targets under Long-Term High Sea States

AU - Lei, Jiaqi

AU - Liu, Shujiang

AU - Li, Han

N1 - Publisher Copyright: © 2025 IEEE.

PY - 2025

Y1 - 2025

N2 - The motion of a maneuvering ship can be decomposed as the consistent translational motion and oscillation. In high sea conditions, the oscillation of the ship is the main factor causing defocusing, and the ISAR (Inverse Synthetic Aperture Radar) method is usually used for imaging. However, under long synthetic aperture durations, ISAR imaging results can vary significantly across different time intervals. Therefore, this paper proposes an aperture selection method for ISAR imaging of ship targets under long-term high sea states. The proposed method first employs time-frequency analysis for the initial selection, Then, the segment center is determined based on GRFT (Generalized Radon-Fourier Transform) parameter space connectivity analysis and the Doppler bandwidth of sub-aperture ISAR imaging. Next, the data segment length is identified based on the parameter matching accuracy of GRFT. Finally, ISAR imaging is performed on the selected data segment. Simulation show that the proposed algorithm achieves good imaging performance.

AB - The motion of a maneuvering ship can be decomposed as the consistent translational motion and oscillation. In high sea conditions, the oscillation of the ship is the main factor causing defocusing, and the ISAR (Inverse Synthetic Aperture Radar) method is usually used for imaging. However, under long synthetic aperture durations, ISAR imaging results can vary significantly across different time intervals. Therefore, this paper proposes an aperture selection method for ISAR imaging of ship targets under long-term high sea states. The proposed method first employs time-frequency analysis for the initial selection, Then, the segment center is determined based on GRFT (Generalized Radon-Fourier Transform) parameter space connectivity analysis and the Doppler bandwidth of sub-aperture ISAR imaging. Next, the data segment length is identified based on the parameter matching accuracy of GRFT. Finally, ISAR imaging is performed on the selected data segment. Simulation show that the proposed algorithm achieves good imaging performance.

KW - Aperture Selection

KW - GRFT

KW - ISAR

KW - Ship Target

UR - https://www.scopus.com/pages/publications/105034174215

U2 - 10.1109/IGARSS55030.2025.11242930

DO - 10.1109/IGARSS55030.2025.11242930

M3 - Conference article

AN - SCOPUS:105034174215

SN - 2153-6996

SP - 7762

EP - 7765

JO - International Geoscience and Remote Sensing Symposium (IGARSS)

JF - International Geoscience and Remote Sensing Symposium (IGARSS)

T2 - 2025 IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2025

Y2 - 3 August 2025 through 8 August 2025

ER -