基于Radon时频分析的海面舰船目标SAR-ISAR混合成像方法

doi:10.12305/j.issn.1001-506X.2025.01.12

Abstract

Abstract:

Under high sea conditions, the irregular motion of ship targets in the three dimensions of yaw, pitch, and roll introduces high-order phase, which leads to defocusing phenomenon when airborne radar directly performs synthetic aperture radar (SAR) imaging of ship targets on the sea surface. Aiming at this problem, a hybrid imaging method of airborne sea surface ship target SAR-inverse SAR (ISAR) based on Radon time-frequency analysis is proposed. Firstly, a hybrid imaging model of SAR-ISAR for airborne sea surface ship targets is established, which transforms the problem of ship imaging blurring caused by the three-axis rotation of sea surface ship targets into an estimation problem of high-order phase errors. Then, based on Radon time-frequency analysis, the high-order phase information of moving ship targets is accurately estimated, and corresponding high-order phase factors are constructed for compensation. Finally, based on the estimated high-order phase information, the ship target is subjected to SAR-ISAR fine focusing imaging, and the processing results of the measured data verified the effectiveness of the proposed method.

Key words: airborne radar, sea surface ship target, synthetic aperture radar (SAR)-inverse SAR (ISAR) hybrid imaging

CLC Number:

TN953

Hongmeng CHEN, Jun LI, Jing LIU, Wei HUANG, Yingjie ZHANG, Yan CHEN, Yaobing LU. SAR-ISAR hybrid imaging method for sea surface ship target based on Radon time-frequency analysis[J]. Systems Engineering and Electronics, 2025, 47(1): 109-116.

Figures/Tables 8

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SAR-ISAR hybrid imaging method for sea surface ship target based on Radon time-frequency analysis

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