Micro-Motion Feature Extraction of Spinning Target Based on Angular Doppler Effect
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摘要: 携带有轨道角动量(OAM)的涡旋电磁(EM)波在雷达应用领域已经受到了广泛关注，利用涡旋电磁波，不仅可以观测到目标的线多普勒频移，还能够获取角多普勒频移信息。基于角多普勒效应，涡旋电磁波雷达具有检测垂直于径向运动分量的能力，可以实现对自旋目标微动特征的提取。首先，该文建立直角坐标系下角多普勒频移的参数化模型，给出了涡旋电磁波雷达、目标运动参数与角多普勒频移之间的定量关系描述。其次，当目标自旋轨迹垂直雷达视线(LOS)方向时，对获取的角多普勒频移信息进行分析，并提取了自旋目标微动特征。最后，通过仿真实验验证了所提方法的有效性和分析的准确性。Abstract: Vortex ElectroMagnetic (EM) wave with Orbital Angular Momentum (OAM) is widely concerned in radar applications. With vortex EM wave, not only the linear Doppler shift of the target can be observed, but also the angular Doppler shift information can be obtained. Based on the angular Doppler effect, the vortex EM wave radar has the ability to detect the component perpendicular to the radial motion, and can extract the micro-motion features of the spinning target. Firstly, the parametric model of angular Doppler shift in Cartesian coordinate system is established, and the quantitative relationship among vortex EM wave radar, target motion parameters and angular Doppler shift is provided. Then, when the target rotational trajectory is perpendicular to the radar Line Of Sight (LOS), the angular Doppler shift is analyzed, and the micro-motion features of the spinning target are extracted. Finally, experimental results are given to demonstrate the effectiveness of the proposed method and the correctness of the theoretical analyses.
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表 1 相关参数设置
参数名称 参数值 频率${f_0}$ 10 GHz 波长$\lambda $ 0.03 m OAM模态$\alpha $ 50 采样频率${f_s}$ 25.6 kHz 旋转中心Q (1 km, π/30 rad, π/3 rad)T 散射点P (0.8 m, 8π/15 rad, π/3 rad)T 旋转频率$\varOmega $ 40 Hz 旋转半径${r_0}$ 0.8 m 速度大小$v$ 100 m/s 
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