基于角多普勒效应的自旋目标微动特征提取

李瑞; 李开明; 张群; 梁佳; 罗迎

doi:10.11999/JEIT200595

基于角多普勒效应的自旋目标微动特征提取

doi: 10.11999/JEIT200595

李瑞^1, ,,
李开明¹,
张群^{1, 2},
梁佳¹,
罗迎^{1, 2}

1.
空军工程大学信息与导航学院西安 710077
2.
复旦大学波散射与遥感信息国家教育部重点实验室上海 200433

基金项目: 国家自然科学基金(61971434, 61631019, 61701530)，陕西省自然科学基础研究计划项目(2020JM-348)

详细信息

作者简介:
李瑞：男，1992年生，博士生，研究方向为雷达关联成像

李开明：男，1982年生，讲师，研究方向为雷达信号处理、目标识别

通讯作者:
李瑞　liruimissing@163.com

中图分类号: TN957.52
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- 被引次数: 0
出版历程
- 收稿日期: 2020-07-20
- 修回日期: 2021-01-24
- 网络出版日期: 2021-02-06
- 刊出日期: 2021-03-22

Micro-Motion Feature Extraction of Spinning Target Based on Angular Doppler Effect

Rui LI^{1
, ,},
Kaiming LI¹,
Qun ZHANG^{1, 2},
Jia LIANG¹,
Ying LUO^{1, 2}

1.
Institute of Information and Navigation, Air Force Engineering University, Xi’an 710077, China
2.
Key Laboratory of Wave Scattering and Remote Sensing Information, Fudan University, Shanghai 200433, China

Funds: The National Natural Science Foundation of China(61971434, 61631019, 61701530), The Natural Science Basic Research Program of Shaanxi Province (2020JM-348)

摘要

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。
- 角多普勒效应 /
- 自旋目标 /
- 微动特征 /
- 涡旋电磁波 /
- 轨道角动量
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.
- Angular Doppler effect /
- Spinning target /
- Micro-motion feature /
- Vortex ElectroMagnetic (EM) wave /
- Orbital Angular Momentum (OAM)

HTML全文

图 1 UCA雷达和目标空间几何示意图

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图 2 点P平动和自旋运动等效几何示意图

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图 3 在$\Delta t$时间内，点P运动等效几何示意图

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图 4 线、角多普勒效应对比

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图 5 角多普勒频移理论值和观测值对比

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图 6 角多普勒频移与其上、下确界关系曲线

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图 7 自旋目标角多普勒频移时频分析结果

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图 8 旋转频率和半径的归一化均方误差绝对值的变化曲线

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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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