Subspectrum Division-Based Imaging Method for Curvilinear Moving Target in Terahertz SAR

IF 4.4

IEEE geoscience and remote sensing letters : a publication of the IEEE Geoscience and Remote Sensing Society Pub Date : 2025-08-25 DOI:10.1109/LGRS.2025.3602279

Zhenjiang Li;Chenggao Luo;Hongqiang Wang;Qi Yang;Heng Zhang;Chuanying Liang

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Abstract

Airborne terahertz (THz) synthetic aperture radar (SAR) exhibits unique potential for ground-moving target imaging (GMTIm), due to its high-frame rate and high-resolution capabilities. However, the short wavelength of THz waves significantly increases Doppler sensitivity. When a ground-moving target performs curvilinear motion, such as turns, velocity inconsistencies among scattering points induce variations in Doppler centroid frequencies, and chirp rates, leading to defocusing and geometric deformation. To address these issues, an effective curvilinear moving target refocusing method is proposed in this letter. First, a localized phase gradient autofocus (LPGA) method is employed to compensate for Doppler chirp rate inconsistencies. Second, the additional spatial-domain information from a dual-channel system is utilized to correct geometric deformation. Finally, both simulated and measured data are analyzed to validate the effectiveness of the proposed method.

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基于子谱分割的太赫兹SAR曲线运动目标成像方法

机载太赫兹（THz）合成孔径雷达（SAR）由于其高帧率和高分辨率能力，在地面移动目标成像（GMTIm）方面表现出独特的潜力。然而，太赫兹波的短波长显著增加了多普勒灵敏度。当地面运动目标进行曲线运动时，散射点之间的速度不一致会引起多普勒质心频率和啁啾率的变化，从而导致离焦和几何变形。为了解决这些问题，本文提出了一种有效的曲线运动目标再聚焦方法。首先，采用局部相位梯度自动聚焦（LPGA）方法补偿多普勒啁啾速率不一致。其次，利用双通道系统的附加空间域信息来校正几何变形。最后，对仿真数据和实测数据进行了分析，验证了所提方法的有效性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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IEEE geoscience and remote sensing letters : a publication of the IEEE Geoscience and Remote Sensing Society

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