一种新型圆迹阵列三维SAR系统的点扩散函数分析与地面实验结果

明婧 张晓玲 蒲羚 师君

明婧, 张晓玲, 蒲羚, 师君. 一种新型圆迹阵列三维SAR系统的点扩散函数分析与地面实验结果[J]. 雷达学报, 2018, 7(6): 770-776. doi: 10.12000/JR18068
引用本文: 明婧, 张晓玲, 蒲羚, 师君. 一种新型圆迹阵列三维SAR系统的点扩散函数分析与地面实验结果[J]. 雷达学报, 2018, 7(6): 770-776. doi: 10.12000/JR18068
Ming Jing, Zhang Xiaoling, Pu Ling, Shi Jun. PSF Analysis and Ground Test Results of a Novel Circular Array 3-D SAR System[J]. Journal of Radars, 2018, 7(6): 770-776. doi: 10.12000/JR18068
Citation: Ming Jing, Zhang Xiaoling, Pu Ling, Shi Jun. PSF Analysis and Ground Test Results of a Novel Circular Array 3-D SAR System[J]. Journal of Radars, 2018, 7(6): 770-776. doi: 10.12000/JR18068

一种新型圆迹阵列三维SAR系统的点扩散函数分析与地面实验结果

doi: 10.12000/JR18068
基金项目: 国家自然科学基金(61571099),博士后面上项目基金(2015M570778)
详细信息
    作者简介:

    明 婧(1995–),女,四川成都人,电子科技大学硕士生,研究方向为合成孔径雷达成像。E-mail: 1519485326@qq.com

    张晓玲(1964–),女,四川成都人,博士,教授,博士生导师,研究方向为SAR成像技术、雷达探测技术。E-mail: xlzhang@uestc.edu.cn

    蒲 羚(1991–),四川成都人,博士生,研究方向为雷达信号处理及SAR系统。E-mail: 741176055@qq.com

    师 君(1979–),男,河南南阳人,博士,副教授,博士生导师,研究方向为SAR成像技术、雷达信号处理。E-mail: shijun@uestc.edu.cn

    通讯作者:

    明婧   1519485326@qq.com

  • 中图分类号: TN957.52

PSF Analysis and Ground Test Results of a Novel Circular Array 3-D SAR System

Funds: The National Natural Science Foundation of China (61571099), The China Postdoctoral Science Foundation (2015M570778)
  • 摘要: 阵列合成孔径雷达(ASAR)具备3维成像能力,是3维SAR成像领域的研究热点之一。该文针对线阵SAR在高分辨率成像方面和圆周SAR在旁瓣抑制方面的问题,提出一种新型圆迹阵列合成孔径雷达(CASAR)系统用于3维高分辨率雷达成像。首先推导基于CASAR系统的点扩散函数模型,从理论上分析圆迹阵列这一新型构型在3维成像中的优势。在此基础上构建原型CASAR实验系统,通过点扩散函数仿真实验和室外实测3维CASAR成像实验验证了3维CASAR成像的有效性,与线阵SAR和圆周SAR实验结果相比,证明CASAR系统可获得3维高分辨率SAR图像以及有效的旁瓣抑制能力。

     

  • 图  1  几何模型

    Figure  1.  Geometry model

    图  2  不同SAR模型点扩散函数图像

    Figure  2.  PSF images of the different SAR models

    图  3  点扩散函数图像切航迹向剖面图

    Figure  3.  Slice image of PSF in the cross-track direction

    图  4  地面实验

    Figure  4.  Ground test

    图  5  CASAR实验场景

    Figure  5.  CASAR experiment scene

    图  6  CASAR实验系统基本框图

    Figure  6.  Basic flow of CASAR experiment system

    图  7  CSAR 实验结果

    Figure  7.  CSAR experimental results

    图  8  CASAR 实验结果

    Figure  8.  CASAR experimental results

    表  1  仿真参数

    Table  1.   Simulation parameters

    仿真参数 SAR系统
    LASAR CSAR CASAR
    信号 单脉冲 单脉冲 单脉冲
    载频(GHz) 5 5 5
    参考距离(m) 1000 1000 1000
    PRF (Hz) 10 10 10
    平台速度(m/s) 6 6 6
    合成孔径时间(s) 105 105 105
    目标位置 (0, 0, 0) (0, 0, 0) (0, 0, 0)
    线阵单元数 500 1 500
    线阵长度(m) 30 30
    圆周半径 $r$ (m) 100 70~100
    合成孔径长度 2 ${{π}}$r 2 ${{π}}$r
    下载: 导出CSV

    表  2  切航迹向性能比较

    Table  2.   Cross-track performance comparison

    实验模型 3 dB带宽(m) PSLR(dB) ISLR(dB)
    LASAR 1.80 –13.28 –11.60
    CSAR 0.22 –7.89 –1.58
    CASAR 0.25 –8.56 –5.31
    下载: 导出CSV

    表  3  实验参数

    Table  3.   Experiment parameters

    CASAR参数
    起始频率(GHz) 6.5
    终止频率(GHz) 8.5
    SF信号步数 801
    圆迹阵列最大半径(m) 1.3
    圆迹阵列最小半径(m) 0.8
    目标位置 球1:(6.7, 0, 1.4) m
    球2:(8.5, 0.9, 1.6) m
    球3:(8.5, –0.8, 1.6) m
    球4:(10.9, 0.5, 1.8) m
    下载: 导出CSV

    表  4  性能比较

    Table  4.   Performance comparison

    实验模型 分辨率(m) PSLR(dB) ISLR(dB)
    CSAR 0.05 –8.325 –2.999
    CASAR 0.05 –9.191 –6.433
    下载: 导出CSV
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出版历程
  • 收稿日期:  2018-09-03
  • 修回日期:  2018-12-19
  • 网络出版日期:  2018-12-28

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