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基于局部散射中心的近、远场微动回波时频分布特性的解析表达

占伟杰 万显荣 易建新

占伟杰, 万显荣, 易建新. 基于局部散射中心的近、远场微动回波时频分布特性的解析表达[J]. 电子与信息学报, 2022, 44(8): 2867-2877. doi: 10.11999/JEIT210565
引用本文: 占伟杰, 万显荣, 易建新. 基于局部散射中心的近、远场微动回波时频分布特性的解析表达[J]. 电子与信息学报, 2022, 44(8): 2867-2877. doi: 10.11999/JEIT210565
ZHAN Weijie, WAN Xianrong, YI Jianxin. Analytical Expression of the Time-Frequency Features of the Near-Field and Far-Field Micro-Motion Echo Based on Local Scattering Centers[J]. Journal of Electronics & Information Technology, 2022, 44(8): 2867-2877. doi: 10.11999/JEIT210565
Citation: ZHAN Weijie, WAN Xianrong, YI Jianxin. Analytical Expression of the Time-Frequency Features of the Near-Field and Far-Field Micro-Motion Echo Based on Local Scattering Centers[J]. Journal of Electronics & Information Technology, 2022, 44(8): 2867-2877. doi: 10.11999/JEIT210565

基于局部散射中心的近、远场微动回波时频分布特性的解析表达

doi: 10.11999/JEIT210565
基金项目: 国家自然科学基金(61931015, 62071335, 61831009),湖北省科技创新项目(2019AAA061),深圳市科技计划项目(JCYJ20170818112037398)
详细信息
    作者简介:

    占伟杰:男,1993年生,博士生,研究方向为外辐射源雷达信号处 理、实时信号并行处理和微多普勒效应

    万显荣:男,1975年生,教授,博士生导师,研究方向为新体制雷达设计,如外辐射源雷达、高频雷达系统及信号处理

    易建新:男,1989年生,博士,研究方向为外辐射源雷达信号处理、目标跟踪和信息融合

    通讯作者:

    万显荣 xrwan@whu.edu.cn

  • 中图分类号: TN958.97

Analytical Expression of the Time-Frequency Features of the Near-Field and Far-Field Micro-Motion Echo Based on Local Scattering Centers

Funds: The National Natural Science Foundation of China (61931015, 62071335, 61831009), The Technological Innovation Project of Hubei Province (2019AAA061), The Science and Technology Planning Project of Shenzhen (JCYJ20170818112037398)
  • 摘要: 微多普勒效应是由目标(或其部件)的转动、振动、进动等微动引起的频率调制现象,能够反映目标的几何结构和运动状态。该文全面分析了近、远场探测条件下目标扇叶转动引起的微动回波的时频分布特性。首先建立了近、远场雷达微动回波模型。然后从远场微动回波模型中推导其瞬时频率表达式,结果表明远场微动回波的时频图中包含由叶尖散射点、叶彀散射点和镜面反射点引入的正弦型flash、零频flash和矩形flash。最后,在近场条件下,直接推导得到上述3类局部散射点的瞬时频率表达式,表明近场微动回波时频图呈现类正弦型flash,零频flash和部分余弦型flash的组合。该文还从积分运算性质和电磁散射理论两方面解释了上述flash的形成机理,揭示了它们与扇叶数目、尺寸、转速等参数之间的关系。该文结果将有助于目标精细化建模、分类识别等应用。仿真和实测数据结果均证明了分析结果的正确性。
  • 图  1  近、远场探测场景示意图

    图  2  两个信号乘积、加和的时频分布结果

    图  3  函数$f(t) = 1/\cos (t)$的时域和频域图

    图  4  近场探测条件下,叶尖散射点情况

    图  5  近场探测条件下,镜面反射点情况

    图  6  远场条件下扇叶回波时频分布特性仿真结果

    图  7  近场条件下扇叶回波时频分布特性仿真结果

    图  8  远场条件下实测时频分布特性

    图  9  近场条件下实测风电机组回波的时频分布特性

    表  1  实验配置及目标参数

    直升机无人机
    ${f_0} = 658{\text{ MHz}}$${f_0} = 658{\text{ MHz}}$
    ${R_0} = 2500{\text{ m}}$${R_0} = 309{\text{ m}}$
    $L = 5{\text{ m}}$$L = 17.25{\text{ cm}}$
    $\omega = 406{\text{ r/min} }$$\omega = 5100{\text{ r/min} }$
    $K = 3$$ K=2\text{ }(4对) $
    $\beta = {40.02^ \circ }$$\beta = {56.95^ \circ }$
    $\delta = {13.82^ \circ }$$\delta = {1.40^ \circ }$
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-06-11
  • 修回日期:  2022-03-17
  • 网络出版日期:  2022-04-12
  • 刊出日期:  2022-08-17

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