Abstract. Imaging, feature extraction, and recognition of targets with micromotion by retrieving their three-dimensional micromotion trajectories (3-D MMTs) have attracted a lot of interest in recent years. We propose a method for retrieving the 3-D MMT of a rotating target based on the interferometric phases obtained using a wideband interferometric radar system with three antennas positioned in L-shape. First, the micro-Doppler effect of rotating target is theoretically analyzed with formulas derived. Then, the instantaneous frequencies are extracted via the short-time Fourier transform and the Viterbi algorithm. The echo signals received by these three antennas are decomposed by the intrinsic chirp component decomposition method, and the interferometric phases of different scatterers are respectively obtained. Finally, the 3-D MMTs of rotating target are reconstructed by exploring the interferometric phases and the range-slow-time data. The effectiveness of the proposed method is validated by both simulations and practical experiment using a Ka-band interferometric radar.

中文翻译：

---

基于干涉雷达的旋转目​​标三维微动轨迹重建

摘要。近年来，通过检索目标的三维微动轨迹 (3-D MMT) 对具有微动的目标进行成像、特征提取和识别引起了很多兴趣。我们提出了一种基于干涉相位检索旋转目标的 3-D MMT 的方法，该干涉相位使用具有三个 L 形定位的宽带干涉雷达系统获得。首先，对旋转目标的微多普勒效应进行理论分析，推导出公式。然后，通过短时傅立叶变换和维特比算法提取瞬时频率。这三个天线接收到的回波信号通过固有线性调频分量分解方法进行分解，分别得到不同散射体的干涉相位。最后，通过探索干涉相位和距离-慢时间数据重建旋转目标的 3-D MMT。所提出方法的有效性通过使用 Ka 波段干涉雷达的模拟和实际实验得到验证。