航空学报 > 2025, Vol. 46 Issue (8): 330982-330982   doi: 10.7527/S1000-6893.2024.30982

利用目标上机会照射源的无源斜视InISAR三维成像

金佳宁1, 汪玲1(), 宫蕊2, 朱岱寅1   

  1. 1.南京航空航天大学 雷达成像与微波光子技术教育部重点实验室,南京 210016
    2.合肥师范学院 计算机与人工智能学院,合肥 230601
  • 收稿日期:2024-07-23 修回日期:2024-09-18 接受日期:2024-12-13 出版日期:2024-12-24 发布日期:2024-12-23
  • 通讯作者: 汪玲 E-mail:tulip_wling@nuaa.edu.cn

3D imaging of passive squint InISAR using target-borne illuminator of opportunity

Jianing JIN1, Ling WANG1(), Rui GONG2, Daiyin ZHU1   

  1. 1.Key Laboratory of Radar Imaging and Microwave Photonics,Ministry of Education,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China
    2.School of Computer and Artificial Intelligence,Hefei Normal University,Hefei 230601,China
  • Received:2024-07-23 Revised:2024-09-18 Accepted:2024-12-13 Online:2024-12-24 Published:2024-12-23
  • Contact: Ling WANG E-mail:tulip_wling@nuaa.edu.cn

摘要:

无源雷达具有反干扰、隐蔽性好、成本低等优点,而利用目标上机会照射源(IO)的无源雷达技术与其他无源雷达系统构型相比,由于IO与目标的距离更近,目标散射信号更强,更易于实现目标的探测。到目前为止,使用目标携带IO进行无源逆合成孔径雷达(ISAR)成像的方法已经被扩展到三维干涉逆合成孔径雷达(InISAR)成像中,但当InISAR工作在斜视模式时,获得的三维图像会发生畸变,无法得到准确的三维重建结果。针对这一问题,提出一种适用于斜视情况的利用目标上IO的无源InISAR三维成像方法。利用坐标变换和非线性最小二乘法(NLS),从包含目标三维坐标信息的二维ISAR图像的距离信息和干涉相位中估计出成像观察坐标系下的目标三维坐标信息。之后,再次进行坐标变换,得到目标本体坐标系下的目标三维坐标信息,实现无畸变的目标三维重建。仿真实验验证了所提无源斜视InISAR三维成像方法的有效性,能够实现斜视畸变的校正。

关键词: 逆合成孔径雷达, 干涉逆合成孔径雷达, 三维成像, 无源雷达, 斜视

Abstract:

Passive radar has the advantages such as anti-interference, good concealment, low cost, etc. Compared to other passive radar system configurations, the passive radar technology that utilizes the target-borne Illuminator of Opportunity (IO) has stronger reflection signals due to closer distance between the target and the IO, making it easier to achieve target detection. So far, the passive ISAR imaging using-target borne IO has been extended to 3D InISAR imaging. However, when InISAR imaging operates in the squint-looking mode, the obtained 3D images will be distorted, and accurate 3D reconstruction results cannot be obtained. To solve this problem, a passive InISAR 3D imaging method that is suitable for the squint-looking mode is proposed. Coordinate transformation and Nonlinear Least Squares (NLS) are used to estimate the target’s 3D coordinate information in the imaging coordinate system from the distance information of the 2D ISAR image and the interferometric phases that both contain the target’s 3D coordinate information. Afterwards, coordinate transformation is performed again to obtain the 3D coordinate information of the target in the target body coordinate system, achieving 3D reconstruction of the target without squint-looking distortion. Simulation experiments verify the effectiveness of the proposed passive squint InISAR 3D imaging method, which can achieve correction of squint-looking distortion.

Key words: Inverse Synthetic Aperture Radar (ISAR), Interferometric Inverse Synthetic Aperture Radar (InISAR), 3D imaging, passive radar, squint-looking

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