To perform 3-D inverse synthetic aperture radar (ISAR) imaging through interferometric processing, all ISAR images should be correctly registered such that the same scatterer appears at the same position along both the range and Doppler directions. However, this condition generally does not hold in most situations because different radar view angles introduce additional angular motion errors that must be compensated. Hence, we herein propose a new ISAR registration method based on joint-channel phase difference (JC-PD) operations. From the result of the JC-PD function, JC-PD profiles are obtained, in which the locations and phases of the maximum peak contain constant and time-varying angular motions, respectively. Using our proposed method, correct ISAR registrations can be achieved in both the range and Doppler directions. In particular, compared to conventional Doppler registration methods, time-varying angular motions are more accurately compensated without the problem of cross-term phase interference. Through simulations and experiments, we verified that the proposed method yielded accurate ISAR registration results; hence, an excellent 3-D target reconstruction through interferometric ISAR imaging was demonstrated.

中文翻译：

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通过联合通道相位差函数进行3D干涉ISAR成像的图像配准

为了通过干涉测量法执行3-D逆合成孔径雷达（ISAR）成像，应正确记录所有ISAR图像，以使同一散射体沿距离和多普勒方向出现在相同位置。但是，在大多数情况下，这种情况通常不成立，因为不同的雷达视角会引入额外的必须补偿的角运动误差。因此，我们在此提出一种基于联合信道相位差（JC-PD）操作的新的ISAR注册方法。根据JC-PD函数的结果，获得JC-PD轮廓，其中最大峰的位置和相位分别包含恒定和随时间变化的角运动。使用我们提出的方法，可以在距离和多普勒方向上都获得正确的ISAR配准。特别是，与传统的多普勒配准方法相比，时变角运动得到了更精确的补偿，而没有交叉项相位干扰的问题。通过仿真和实验，我们验证了该方法产生了准确的ISAR配准结果。因此，通过干涉ISAR成像证明了出色的3-D目标重建。