基于长合成孔径的辐射源成像定位算法

王裕旗 孙光才 杨军 邢孟道 杨小牛 保铮

王裕旗, 孙光才, 杨军, 等. 基于长合成孔径的辐射源成像定位算法[J]. 雷达学报, 2020, 9(1): 185–194. doi: 10.12000/JR19080
引用本文: 王裕旗, 孙光才, 杨军, 等. 基于长合成孔径的辐射源成像定位算法[J]. 雷达学报, 2020, 9(1): 185–194. doi: 10.12000/JR19080
WANG Yuqi, SUN Guangcai, YANG Jun, et al. Passive localization algorithm for radiation source based on long synthetic aperture[J]. Journal of Radars, 2020, 9(1): 185–194. doi: 10.12000/JR19080
Citation: WANG Yuqi, SUN Guangcai, YANG Jun, et al. Passive localization algorithm for radiation source based on long synthetic aperture[J]. Journal of Radars, 2020, 9(1): 185–194. doi: 10.12000/JR19080

基于长合成孔径的辐射源成像定位算法

DOI: 10.12000/JR19080
基金项目: 国家杰出青年自然基金(61825105)
详细信息
    作者简介:

    王裕旗(1994–),男,博士生,研究方向为合成孔径雷达成像和合成孔径无源定位。E-mail: xdwangyuqi@163.com

    孙光才(1984–),男,湖北孝感人,博士,副教授,研究方向为合成孔径雷达成像、动目标检测和合成孔径无源定位。E-mail: gcsun@xidian.edu.cn

    杨 军(1984–),男,博士,讲师,研究方向为星载合成孔径雷达。E-mail: yangjun_kx@163.com

    邢孟道(1975–),男,博士,教授,主要研究方向为雷达成像技术、稀疏信号处理、激光合成孔径成像、微波光子合成孔径成像等。E-mail: xmd@xidian.edu.cn

    杨小牛(1961–),男,中国工程院院士,主要研究方向为通信信号处理与分析,软件无线电等

    保 铮(1927–),男,中国科学院院士,主要研究方向为数字信号处理、时空2维信号处理、雷达成像等

    通讯作者:

    孙光才 gcsun@xidian.edu.cn

  • 中图分类号: TN958

Passive Localization Algorithm for Radiation Source Based on Long Synthetic Aperture

Funds: The National Science Fund for Distinguished Young Scholars (61825105)
More Information
  • 摘要: 考虑到单平台测角的定位精度随目标的距离增加而下降、远距离处的方位定位精度有待提高的问题,该文提出了一种基于长合成孔径的辐射源定位算法。该算法将合成孔径成像的概念引入到辐射源无源定位中,通过平台的移动形成长的虚拟孔径,以合成孔径雷达的方式处理数据,获得很高的方位定位精度。对于单频辐射源,接收信号在方位上等效为线性调频信号,其调频率与辐射源的距离成反比,通过距离搜索和方位聚焦的方法在距离-方位域完成信号聚焦,直接获得辐射源2维成像定位结果。针对宽波束侦察的特点,分析了低采样率下调频率距离-方位的耦合关系,并提出了信号角度估计和2维成像定位的方法。理论推导和实测数据处理结果验证了该定位算法的有效性。

     

  • 图  1  合成孔径定位几何模型

    Figure  1.  Localization geometry model

    图  2  采集数据的利用方式

    Figure  2.  Data usage diagram

    图  3  不同发射频率,不同垂直距离对应的点散布函数

    Figure  3.  PSF for different frequencies and different ranges

    图  4  单频连续波辐射源合成孔径侦察算法流程

    Figure  4.  Flow chart of proposed algorithm for single frequency signal

    图  5  多辐射源同时定位的结果

    Figure  5.  Localization result of multiple sources

    图  6  不同信噪比下定位的均方根误差

    Figure  6.  RMSE of different SNR

    图  7  QPSK信号频谱

    Figure  7.  QPSK signal spectrum

    图  8  相位补偿后QPSK信号的频谱

    Figure  8.  Spectrum after phase compensation

    图  9  2维重排信号的方位谱

    Figure  9.  Azimuth spectrum of two-dimensional signal

    图  10  距离位置定位的结果

    Figure  10.  Range localization result

    图  11  距离位置定位结果局部放大

    Figure  11.  Enlarged view of range localization result

    图  12  辐射源的频率和方位位置

    Figure  12.  Frequency and azimuth location

    图  13  测角定位的结果

    Figure  13.  Localization result of angle measurement

    表  1  定位误差对比(km)

    Table  1.   Comparison of localization errors (km)

    测角定位误差合成孔径定位误差
    27.4776.214
    23.4508.262
    14.0093.163
    34.9067.276
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出版历程
  • 收稿日期:  2019-09-05
  • 修回日期:  2020-02-11
  • 网络出版日期:  2020-02-28

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