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基于瞬时相关频域检测的复合调制引信定距方法

王雄武 郝新红 贾建光 栗苹 陈齐乐

王雄武, 郝新红, 贾建光, 等 . 基于瞬时相关频域检测的复合调制引信定距方法[J]. 北京航空航天大学学报, 2020, 46(11): 2176-2183. doi: 10.13700/j.bh.1001-5965.2019.0592
引用本文: 王雄武, 郝新红, 贾建光, 等 . 基于瞬时相关频域检测的复合调制引信定距方法[J]. 北京航空航天大学学报, 2020, 46(11): 2176-2183. doi: 10.13700/j.bh.1001-5965.2019.0592
WANG Xiongwu, HAO Xinhong, JIA Jianguang, et al. A ranging method of hybrid modulation fuze based on instant correlation frequency domain detection[J]. Journal of Beijing University of Aeronautics and Astronautics, 2020, 46(11): 2176-2183. doi: 10.13700/j.bh.1001-5965.2019.0592(in Chinese)
Citation: WANG Xiongwu, HAO Xinhong, JIA Jianguang, et al. A ranging method of hybrid modulation fuze based on instant correlation frequency domain detection[J]. Journal of Beijing University of Aeronautics and Astronautics, 2020, 46(11): 2176-2183. doi: 10.13700/j.bh.1001-5965.2019.0592(in Chinese)

基于瞬时相关频域检测的复合调制引信定距方法

doi: 10.13700/j.bh.1001-5965.2019.0592
基金项目: 

国家自然科学基金 61871414

装备预研领域基金 61406190101

详细信息
    作者简介:

    王雄武  男, 硕士研究生。主要研究方向:无线电引信信号处理技术

    郝新红  女, 博士, 副教授, 博士生导师。主要研究方向:中近程探测及控制技术、引信抗干扰技术

    通讯作者:

    郝新红, E-mail: haoxinhong@bit.edu.cn

  • 中图分类号: TJ43+4.1

A ranging method of hybrid modulation fuze based on instant correlation frequency domain detection

Funds: 

National Natural Science Foundation of China 61871414

Equipment Pre-research Field Foundation of China 61406190101

More Information
  • 摘要:

    为了实现混沌调相与线性调频复合调制无线电引信对不同散射特性的地面目标的精确定距功能,提出一种基于瞬时相关频域检测的复合调制引信定距方法。在时域瞬时相关处理之前,对本地预设混沌码与目标回波信号以码元宽度为采样周期进行同步采样;为减小目标回波幅值对定距方法的影响,以二维快速傅里叶变换(2D-FFT)提取目标的距离、速度信息,以相关窗位置、谐波包络主瓣位置、稳定的多普勒频率3个特征量作为定距依据,从频域角度进行精确定距。仿真结果表明:所提方法的判定结果只与目标信号信噪比有关,而与信号幅值具体大小无关;所提方法可在-28 dB的极低信噪比条件下实现复合调制引信对不同散射特性地面目标的精确定距功能。

     

  • 图 1  混沌调相与线性调频复合引信工作原理

    Figure 1.  Working principle of hybrid modulation fuze combining chaotic code bi-phase modulation with linear frequency modulation

    图 2  复合引信定距方法流程图

    Figure 2.  Flowchart of ranging method based on hybridmodulation fuze

    图 3  不同目标回波延迟下瞬时相关混沌码频谱

    Figure 3.  Spectrums of instant correlation chaos code under different target echo delays

    图 4  相关窗内外瞬时相关差频信号频谱

    Figure 4.  Spectrums of instant correlation beat signal inside/outside correlation window

    图 5  复合引信谐波幅值、多普勒频率与距离的关系

    Figure 5.  Relationship between harmonic amplitude & Doppler frequency and range for hybrid modulation fuze

    图 6  不同地面散射系数下多普勒频率及目标判定结果

    Figure 6.  Doppler frequency and target judgment results under different ground scattering coefficients

    图 7  不同地面散射系数下判定距离箱线图

    Figure 7.  Box-plot of judging ranges under different ground scattering coefficients

    图 8  不同信噪比下判定距离箱线图

    Figure 8.  Box-plot of judging ranges under different signal-to-noise ratios

    表  1  复合引信仿真参数取值

    Table  1.   Simulation parameter values of hybrid modulation fuze

    参数 数值
    载波频率f0/GHz 3
    差频信号采样率fs/MHz 20
    弹目径向运动速率Vr/(m·s-1) 500
    目标多普勒频率fd/kHz 10
    调制频率fm/kHz 100
    调制频偏Δ F/MHz 100
    混沌码码元宽度Tc/ns 50
    预定炸高R0/m 6
    下载: 导出CSV

    表  2  定距方法参数取值

    Table  2.   Parameter values of ranging method

    参数 数值
    谐波次数k 16
    谐波包络主瓣范围Rp/m (5.25, 6.75)
    系统附加延迟τsc/ns 5
    本地预设延迟τ0/ns 40
    距离维FFT每帧数据点数NT1 200
    速度维FFT每帧数据点数NT2 100
    速度维FFT帧间更新点数ND2 5
    判定点数NL 25
    下载: 导出CSV

    表  3  不同信噪比下定距成功率

    Table  3.   Ranging success rates under different signal-to-noise ratios

    信噪比/dB 定距成功率/%
    -10 100.00
    -20 100.00
    -26 99.90
    -28 99.25
    -30 91.40
    下载: 导出CSV
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出版历程
  • 收稿日期:  2019-11-18
  • 录用日期:  2019-12-27
  • 刊出日期:  2020-11-20

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