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大气折射率波动引起的SAR成像误差分析

汪玲 孙玲玲 宫蕊 朱岱寅

汪玲, 孙玲玲, 宫蕊, 朱岱寅. 大气折射率波动引起的SAR成像误差分析[J]. 电子与信息学报, 2021, 43(3): 665-673. doi: 10.11999/JEIT200285
引用本文: 汪玲, 孙玲玲, 宫蕊, 朱岱寅. 大气折射率波动引起的SAR成像误差分析[J]. 电子与信息学报, 2021, 43(3): 665-673. doi: 10.11999/JEIT200285
Ling WANG, Lingling SUN, Rui GONG, Daiyin ZHU. Error Analysis in SAR Imaging Due to Fluctuation of Atmospheric Refractive Index[J]. Journal of Electronics and Information Technology, 2021, 43(3): 665-673. doi: 10.11999/JEIT200285
Citation: Ling WANG, Lingling SUN, Rui GONG, Daiyin ZHU. Error Analysis in SAR Imaging Due to Fluctuation of Atmospheric Refractive Index[J]. Journal of Electronics and Information Technology, 2021, 43(3): 665-673. doi: 10.11999/JEIT200285

大气折射率波动引起的SAR成像误差分析

doi: 10.11999/JEIT200285
基金项目: 国家重点研发计划(2017YFB0502700),国家自然科学基金(61871217),航空科学基金(20182052011)
详细信息
    作者简介:

    汪玲:女,1977年生,教授,博士生导师,主要研究方向为雷达信号处理、雷达成像、雷达图像处理

    孙玲玲:女,1995年生,硕士生,研究方向为合成孔径雷达成像

    宫蕊:女,1997年生,博士生,研究方向为雷达信号处理、逆合成孔径雷达成像

    朱岱寅:男,1974年生,教授,博士生导师,主要研究方向为雷达信号处理、雷达成像、雷达图像处理

    通讯作者:

    汪玲 tulip_wling@nuaa.edu.cn

  • 中图分类号: TN957

Error Analysis in SAR Imaging Due to Fluctuation of Atmospheric Refractive Index

Funds: The National Key Research and Development Program of China (2017YFB0502700), The National Natural Science Foundation of China(61871217), The Aeronautical Science Foundation of China (20182052011)
  • 摘要: 合成孔径雷达(SAR)成像中通常默认大气折射率为1,即电磁(EM)波速率等于自由空间光速且忽略大气吸收特性,但实际存在的吸收会减弱入射功率,电磁波速率的变化会引起相位误差,从而影响图像重建。该文定量分析电磁波速率波动和大气吸收对雷达图像的影响,理论推导得出大气吸收会导致振幅误差,表现为散射点在图像中的重建幅度误差;电磁波速率波动会导致相位误差,表现为散射点在图像中的重建位置误差。仿真实验验证了误差分析的正确性。该分析进一步完备了SAR成像误差分析,有助于SAR图像正确解译。
  • 图  1  地形平坦时单基SAR中向量和角度示意图

    图  2  吸收引起的滤波效应

    图  3  无折射率误差时的单点和多点目标重建图

    图  4  电磁波速率误差影响下的点目标重建图

    图  5  波速误差导致的SAR图像位置误差的理论值和测量值

    图  6  电磁波速率误差影响下的多目标场景“NUAA”重建图

    图  7  大气吸收作用下的点目标重建图

    图  8  大气吸收作用下的多目标场景“NUAA”重建图

    表  1  电磁波速率误差仿真参数设置

    配置天线到目标距离${R_c}$(km)大气折射率$n$电磁波速率误差$\varDelta {\rm{c}}$(m/s)
    I60$1 + 5 \times 1{0^{ - 4}}$$1.5 \times 1{0^5}$
    II60$1 + 8 \times 1{0^{ - 4}}$$2.4 \times 1{0^5}$
    III30$1 + 5 \times 1{0^{ - 4}}$$1.5 \times 1{0^5}$
    下载: 导出CSV
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出版历程
  • 收稿日期:  2020-04-21
  • 修回日期:  2021-01-13
  • 网络出版日期:  2021-02-25
  • 刊出日期:  2021-03-22

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