一种海洋涡旋SAR图像仿真方法

王宇航 杨敏 种劲松

王宇航, 杨敏, 种劲松. 一种海洋涡旋SAR图像仿真方法[J]. 雷达学报, 2019, 8(3): 382–390. doi: 10.12000/JR18052
引用本文: 王宇航, 杨敏, 种劲松. 一种海洋涡旋SAR图像仿真方法[J]. 雷达学报, 2019, 8(3): 382–390. doi: 10.12000/JR18052
WANG Yuhang, YANG Min, and CHONG Jinsong. SAR image simulation method for oceanic eddies[J]. Journal of Radars, 2019, 8(3): 382–390. doi: 10.12000/JR18052
Citation: WANG Yuhang, YANG Min, and CHONG Jinsong. SAR image simulation method for oceanic eddies[J]. Journal of Radars, 2019, 8(3): 382–390. doi: 10.12000/JR18052

一种海洋涡旋SAR图像仿真方法

doi: 10.12000/JR18052
基金项目: 国家部委基金,微波成像技术国家重点实验室基金(CXJJ_15S119)
详细信息
    作者简介:

    王宇航(1992–),女,博士生,中国科学院电子学研究所。研究方向为SAR海洋遥感探测与应用。E-mail: iecas_wang@126.com

    杨敏:杨   敏(1988–),女,硕士。2013年在中国科学院电子学研究所获得硕士学位。研究方向为SAR海洋遥感探测与应用。E-mail: minyang993@126.com

    种劲松(1969–),女,博士,研究员,博士生导师。2000年在北京航空航天大学宇航学院获得硕士学位,2003年在中国科学院研究生院获得博士学位,现担任中国科学院电子学研究所研究员。研究方向为SAR海洋微波遥感。E-mail: iecas_chong@163.com

    通讯作者:

    种劲松  iecas_chong@163.com

  • 中图分类号: TN957.52

SAR Image Simulation Method for Oceanic Eddies

Funds: The National Ministries Foundation, The Foundation of National Key Laboratory of Science and Technology on Microwave Imaging (CXJJ_15S119)
More Information
  • 摘要: 海洋涡旋对海洋热循环起着关键作用,是海洋科学研究中的一个重要分支。合成孔径雷达(Synthetic Aperture Radar, SAR)为海洋涡旋的观测和研究提供了大量的图像数据,但是涡旋在SAR成像时会受到各种海洋环境因素的影响,难以解译涡旋SAR图像特征。仿真SAR图像可以用于研究涡旋的特征,但是目前极少有关于涡旋SAR图像仿真方法的研究。为了更好地解译SAR图像中的涡旋特征,该文提出了一种涡旋SAR图像仿真方法。首先,基于流体力学中典型的Burgers-Rott涡旋模型,建立涡旋2维表面流场;然后,利用SAR海洋成像仿真模型,仿真给定涡旋2维流场、海面风场以及雷达系统参数下的涡旋SAR图像。该文针对气旋式涡旋与反气旋式涡旋进行了仿真实验,并建立了仿真涡旋SAR图像的相似度评价标准。实验结果表明,仿真的涡旋SAR图像与真实星载涡旋SAR图像能够较好地吻合,验证了方法的有效性。

     

  • 图  1  涡旋SAR图像仿真方法流程图

    Figure  1.  Flow chart of the simulation method of SAR eddy image

    图  2  SAR海洋成像仿真模型示意图[22]

    Figure  2.  Schematic diagram of oceanic SAR imagery simulation model[22]

    图  3  中国东海海域获取的ERS-2 SAR图像,获取时间为2009.08.19, 02:23:50 UTC

    Figure  3.  ERS-2 SAR image of the East China Sea obtained on August 19, 2009 at 02:23:50 UTC

    图  4  从方框1处截取的涡旋SAR图像

    Figure  4.  Enlargement of the eddy in Frame 1

    图  5  相同参数下仿真SAR图像与ERS-2 SAR图像对比图

    Figure  5.  Comparison of simulated SAR image and ERS-2 SAR image under the same parameters

    图  6  仿真SAR图像与ERS-2 SAR图像涡旋信息提取

    Figure  6.  Eddy information extraction of simulated SAR image and ERS-2 SAR image

    图  7  吕宋海峡获取的ENVISAT-1 ASAR图像,获取时间为2010.06.11, 01:51:48 UTC

    Figure  7.  ENVISAT-1 ASAR image of the Luson Strait obtained on June 11, 2010 at 01:51:48 UTC

    图  8  方框2处截取的涡旋SAR图像

    Figure  8.  Enlargement of the eddy in Frame 2

    图  9  相同参数下仿真SAR图像与ENVISAT-1 ASAR图像对比图

    Figure  9.  Comparison of simulated SAR image and ENVISAT-1 ASAR image under the same parameters

    图  10  仿真SAR图像与ENVISAT-1 ASAR图像涡旋信息提取

    Figure  10.  Eddy information extraction of simulated SAR image and ENVISAT-1 ASAR image

    表  1  ERS-2 SAR参数

    Table  1.   SAR parameters of ERS-2

    参数数值
    极化方式VV
    波段C
    入射角23.0°
    平台高度780 km
    平台速度7500 m/s
    下载: 导出CSV

    表  2  涡旋信息提取结果

    Table  2.   Results of eddy information extraction

    SAR图像涡旋中心位置涡旋直径涡旋边缘长度
    仿真SAR图像(116,75)18.9 km35.7 km
    真实SAR图像(113,71)18.7 km35.4 km
    绝对/相对误差(3,4)/—0.2 km/0.0110.3 km/0.008
    下载: 导出CSV

    表  3  ENVISAT-1 ASAR参数

    Table  3.   ASAR parameters of ENVISAT-1

    参数数值
    极化方式HH
    波段C
    入射角26.7°
    平台高度800 km
    平台速度7455 m/s
    下载: 导出CSV

    表  4  涡旋信息提取结果

    Table  4.   Results of eddy information extraction

    SAR图像涡旋中心位置涡旋直径涡旋边缘尺寸
    仿真SAR图像(144,78)24.0 km49.4 km
    真实SAR图像(147,81)23.9 km49.7 km
    绝对/相对误差(3,3)/—0.1 km/0.0040.3 km/0.006
    下载: 导出CSV
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出版历程
  • 收稿日期:  2018-07-05
  • 修回日期:  2018-09-11
  • 网络出版日期:  2019-06-01

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