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频率步进SAR虚拟阵列模型成像方法

冉达 尹灿斌 贾鑫

冉达, 尹灿斌, 贾鑫等 . 频率步进SAR虚拟阵列模型成像方法[J]. 北京航空航天大学学报, 2018, 44(1): 82-88. doi: 10.13700/j.bh.1001-5965.2016.0943
引用本文: 冉达, 尹灿斌, 贾鑫等 . 频率步进SAR虚拟阵列模型成像方法[J]. 北京航空航天大学学报, 2018, 44(1): 82-88. doi: 10.13700/j.bh.1001-5965.2016.0943
RAN Da, YIN Canbin, JIA Xinet al. Imaging approach for frequency-stepped SAR with virtual array model[J]. Journal of Beijing University of Aeronautics and Astronautics, 2018, 44(1): 82-88. doi: 10.13700/j.bh.1001-5965.2016.0943(in Chinese)
Citation: RAN Da, YIN Canbin, JIA Xinet al. Imaging approach for frequency-stepped SAR with virtual array model[J]. Journal of Beijing University of Aeronautics and Astronautics, 2018, 44(1): 82-88. doi: 10.13700/j.bh.1001-5965.2016.0943(in Chinese)

频率步进SAR虚拟阵列模型成像方法

doi: 10.13700/j.bh.1001-5965.2016.0943
详细信息
    作者简介:

    冉达 男, 博士, 讲师。主要研究方向:合成孔径雷达成像、雷达信号处理

    尹灿斌 男, 博士, 讲师。主要研究方向:合成孔径雷达成像及对抗

    贾鑫 男, 教授, 博士生导师。主要研究方向:合成孔径雷达成像及对抗

    通讯作者:

    尹灿斌, E-mail: ExpressESP@126.com

  • 中图分类号: V243.2;TN957.52

Imaging approach for frequency-stepped SAR with virtual array model

More Information
  • 摘要:

    针对频率步进合成孔径雷达(SAR)采用经典逆傅里叶变换成像方法时距离向无模糊测绘带宽度有限的问题,提出一种将频率步进SAR脉冲串信号等效为沿航迹分布的虚拟阵列雷达信号的模型及成像处理方法,并利用改进的后向投影方法实现对目标的无模糊成像。建立了频率步进SAR虚拟阵列模型,给出了基于该模型的高分辨距离像合成方法,并通过在原始后向投影方法的基础上引入距离偏移校正和二次相位补偿,实现了对目标的精确二维成像。结果表明:频率步进SAR虚拟阵列模型成像方法不受频率步进雷达无模糊测绘带宽度的理论限制,可以实现较宽测绘带内各目标的无模糊、快速成像。

     

  • 图 1  虚拟阵列模型的频率步进SAR成像空间几何示意图

    Figure 1.  Spatial geometry of frequency-stepped SAR imaging of virtual array model

    图 2  经典方法与本文方法目标距离像对比

    Figure 2.  Comparison of target range profile between classic method and proposed method

    图 3  本文方法成像结果

    Figure 3.  Imaging result of proposed method

    图 4  经典方法和本文方法后向投影成像结果对比

    Figure 4.  Comparison of back-projection imaging results between classic method and proposed method

    表  1  仿真参数

    Table  1.   Simulation parameters

    参数数值
    参考载频/GHz10
    子脉冲数目1 025
    天线波束宽度/(°)1.30
    平台高度/km8.00
    总信号带宽/MHz700
    脉冲串重复频率/Hz333.14
    场景大小(距离向×方位向)/(m×m)200×200
    频率步进量/MHz0.683
    子脉冲宽度/μs1.46
    平台速度/(m·s-1)58.50
    参考斜距/km11.31
    占空比0.50
    子脉冲重复频率/kHz341.46
    地距分辨率(距离向×方位向)/(m×m)0.30×0.36
    下载: 导出CSV

    表  2  本文方法目标点散布函数结果

    Table  2.   Target point spread function results of proposed method

    目标
    序号
    距离向方位向
    PSLR/dBISLR/dBPSLR/dBISLR/dB
    1-13.382 0-9.857 6-13.277 6-10.225 8
    2-13.383 5-9.848 7-13.303 5-10.209 2
    3-13.382 0-9.857 6-13.277 6-10.225 8
    4-13.462 5-9.895 5-13.283 4-10.225 7
    5-13.470 1-9.885 1-13.326 2-10.228 3
    6-13.462 5-9.895 5-13.283 4-10.225 7
    7-13.619 6-9.960 1-13.292 1-10.221 3
    8-13.624 9-9.952 2-13.306 4-10.216 5
    9-13.619 6-9.960 1-13.292 1-10.221 3
    下载: 导出CSV

    表  3  经典方法目标点散布函数结果

    Table  3.   Target point spread function results of classic method

    目标
    序号
    距离向方位向
    PSLR/dBISLR/dBPSLR/dBISLR/dB
    1-13.310 3-9.957 4-13.203 1-10.218 2
    2-13.312 9-9.840 0-13.203 5-10.218 9
    3-13.314 0-9.771 2-13.274 3-10.221 5
    4-13.300 3-9.895 5-13.213 0-10.217 2
    5-13.387 6-9.966 4-13.221 2-10.220 8
    6-13.320 0-10.009 0-13.230 3-10.217 5
    7-13.310 3-9.961 9-13.213 4-10.221 3
    8-13.390 3-9.856 9-13.202 1-10.220 6
    9-13.319 6-9.985 4-13.198 4-10.219 1
    下载: 导出CSV
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出版历程
  • 收稿日期:  2016-12-15
  • 录用日期:  2017-04-24
  • 刊出日期:  2018-01-20

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