基于单脉冲雷达和差通道多普勒估计的前视成像

李悦丽 马萌恩 赵崇辉 周智敏

李悦丽, 马萌恩, 赵崇辉, 等. 基于单脉冲雷达和差通道多普勒估计的前视成像[J]. 雷达学报, 2021, 10(1): 131–142. doi: 10.12000/JR20111
引用本文: 李悦丽, 马萌恩, 赵崇辉, 等. 基于单脉冲雷达和差通道多普勒估计的前视成像[J]. 雷达学报, 2021, 10(1): 131–142. doi: 10.12000/JR20111
LI Yueli, MA Meng’en, ZHAO Chonghui, et al. Forward-looking Imaging via Doppler estimates of sum-difference measurements in scanning monopulse radar[J].Journal of Radars, 2021, 10(1): 131–142. doi: 10.12000/JR20111
Citation: LI Yueli, MA Meng’en, ZHAO Chonghui, et al. Forward-looking Imaging via Doppler estimates of sum-difference measurements in scanning monopulse radar[J].Journal of Radars, 2021, 10(1): 131–142. doi: 10.12000/JR20111

基于单脉冲雷达和差通道多普勒估计的前视成像

doi: 10.12000/JR20111
基金项目: 国家部委基金(61404150103, 61425020604)
详细信息
    作者简介:

    李悦丽(1973–),女,湖南浏阳人,博士,国防科技大学电子科学学院教授。主要研究方向为机载雷达合成孔径成像、前视成像以及射频干扰抑制技术。E-mail: liyueli4uwb@nudt.edu.cn

    马萌恩(1996–),男,陕西渭南人,国防科技大学电子科学学院硕士。主要研究方向为雷达信号处理与成像技术。E-mail: mamengen18@nudt.edu.cn

    赵崇辉(1979–),男,河北鹿泉人,硕士,北京遥感设备研究所高工、型号主任设计师,主要研究方向为雷达总体设计、毫米波雷达成像。E-mail: zhaochonghui@163.com

    周智敏(1957–),男,河北易县人,国防科技大学电子科学学院教授,主要研究方向为超宽带雷达技术

    通讯作者:

    李悦丽 liyueli4uwb@nudt.edu.cn

    赵崇辉 zhaochonghui@163.com

  • 责任主编:朱岱寅 Corresponding Editor: ZHU Daiyin
  • 中图分类号: TN958.4

Forward-looking Imaging via Doppler Estimates of Sum-difference Measurements in Scanning Monopulse Radar(in English)

Funds: The National Pre-Research Foundation (61404150103, 61425020604)
More Information
  • 摘要: 单脉冲测角技术用于扫描雷达前视成像可有效提高图像的清晰度,但单个脉冲对同分辨单元多目标测角时会发生角闪烁现象,造成图像模糊。该文提出了一种基于单脉冲雷达和差通道多普勒估计的前视成像算法,利用目标和平台之间相对运动引起的多普勒梯度差异实现同分辨单元内不同方向目标的分离,然后在多普勒域采用和差比幅测角(SDAC)技术测量目标的方位角,完成能量投影。为提高测角精度,进一步提出了采用调频Z变换(CZT)重建和差多普勒估计并进行比幅测角的算法。点目标仿真实验结果表明,所提出的算法在前斜视方向具有分离多目标的能力,对实测数据成像结果验证了基于CZT的成像算法相比传统算法能显著提高对场景成像的轮廓清晰度。

     

  • 图  1  雷达扫描前视成像几何关系示意图

    Figure  1.  Geometry for forward-looking imaging of a scanning radar

    图  2  基于多普勒估计的单脉冲前视成像流程

    Figure  2.  Flowchart of mono pulse forward-looking imagination based on Doppler estimates

    图  3  基于重建多普勒估计的单脉冲前视成像流程

    Figure  3.  Flowchart of monopulse forward-looking imaging based on the reconstructed Doppler estimates

    图  4  点阵目标单脉冲前视成像效果对比(SNR=20 dB)

    Figure  4.  Comparison of forward-looking imaging performance (SNR=20 dB)

    图  5  距离1730 m处目标的方位向剖面图(SNR=20 dB)

    Figure  5.  Azimuthal contour plots for point targets at the range cell 1730 m (SNR=20 dB)

    图  6  仿真场景前视成像效果对比

    Figure  6.  Comparison of experimental results in forward looking imaging

    7  实测数据前视成像效果对比

    7.  Comparison of experimental results in forward-looking imaging

    图  1  Geometry of the forward-looking imaging of a scanning radar

    图  2  Flowchart of mono pulse forward-looking imagination based on Doppler estimates

    图  3  Flowchart of monopulse forward-looking imaging based on the reconstructed Doppler estimates

    图  4  Comparison of forward-looking imaging performance (SNR = 20 dB)

    图  5  Azimuthal contour plot for point targets at the range cell 1730 m (SNR = 20 dB)

    图  6  Comparison of experimental results of forward-looking imaging

    7  Comparison of experimental results in forward-looking imaging

    表  1  波束扫描前视成像实验仿真参数

    Table  1.   Simulation parameters of a forward-looking scanning radar

    参数 取值 参数 取值
    场景中心地距 1700 m 平台飞行速度 100 m/s
    雷达中心频率 18 GHz 距离×方位分辨单元 3 m×3 m
    信号带宽 50 MHz 信号脉宽 1 μs
    和通道3 dB波束宽度 波束扫描范围 –15°~15°
    脉冲重复频率PRF 2000 Hz 天线扫描速度 30°/s
    下载: 导出CSV

    表  1  Simulation parameters of a forward-looking scanning radar

    Parameters Value Parameters Value
    Center ground range 1700 m Platform velocity 100 m/s
    Center frequency 18 GHz Pixel resolution 3 m × 3 m
    Bandwidth 50 MHz Pulse width 1 μs
    3 dB beamwidth of the sum channel Antenna scanning area –15°–15°
    Pulse repeat frequency 2000 Hz Scanning rate 30°/s
    下载: 导出CSV
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出版历程
  • 收稿日期:  2020-08-01
  • 修回日期:  2020-10-27
  • 网络出版日期:  2020-11-16

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