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近天底干涉SAR动态海面高程测量误差分析

陈尧 黄默 王小青 黄海风

陈尧, 黄默, 王小青, 黄海风. 近天底干涉SAR动态海面高程测量误差分析[J]. 电子与信息学报, 2020, 42(3): 547-554. doi: 10.11999/JEIT190191
引用本文: 陈尧, 黄默, 王小青, 黄海风. 近天底干涉SAR动态海面高程测量误差分析[J]. 电子与信息学报, 2020, 42(3): 547-554. doi: 10.11999/JEIT190191
Yao CHEN, Mo HUANG, Xiaoqing WANG, Haifeng HUANG. Error Analysis of Dynamic Sea Surface Height Measurement by Near-nadir Interferometric SAR[J]. Journal of Electronics & Information Technology, 2020, 42(3): 547-554. doi: 10.11999/JEIT190191
Citation: Yao CHEN, Mo HUANG, Xiaoqing WANG, Haifeng HUANG. Error Analysis of Dynamic Sea Surface Height Measurement by Near-nadir Interferometric SAR[J]. Journal of Electronics & Information Technology, 2020, 42(3): 547-554. doi: 10.11999/JEIT190191

近天底干涉SAR动态海面高程测量误差分析

doi: 10.11999/JEIT190191
基金项目: 国家自然科学基金重大研究计划(91438202)
详细信息
    作者简介:

    陈尧:男,1995年生,博士生,研究领域为雷达信号处理与系统仿真

    黄默:男,1973年生,研究员,博士生导师,研究领域为雷达系统总体

    王小青:男,1978年生,教授,博士生导师,研究领域为SAR海洋遥感与机理

    黄海风:男,1976年生,教授,博士生导师,研究方向为分布式星载系统理论

    通讯作者:

    陈尧 chenyao1995@ime.ac.cn

  • 中图分类号: TN959.6

Error Analysis of Dynamic Sea Surface Height Measurement by Near-nadir Interferometric SAR

Funds: The Major Research Plan of the Natural Science Foundation of China (91438202)
  • 摘要:

    采用近天底的宽刈幅干涉高度计是近年来新发展的海面高程测量技术,与陆地高程测量不同,海浪一直处于随机运动之中,其动态特性会在合成孔径雷达(SAR)成像和干涉处理中引入显著误差。对于厘米级的干涉测量精度要求来说,该误差是主要误差源之一。该文研究了由海面特性引起的高程误差机理及其对于近天底干涉SAR测高精度的影响,建立了运动误差理论模型,同时考虑了电磁偏差与叠掩偏差影响。基于不同SAR工作体制,在不同海况下进行了理论近似仿真,并进行了干涉SAR全链路仿真,全链路仿真结果能够与理论仿真较好地吻合,验证了误差模型的正确。结果显示由海浪引起的误差随着多普勒中心频率近似呈线性变化,且与目标散射加权径向速度成正比。误差不仅与海浪特性相关,还与雷达系统参数相关,这能为未来系统设计、误差预算和海面高程处理提供参考。

  • 图  1  干涉SAR运动目标测量几何示意图

    图  2  误差仿真流程图

    图  3  部分海洋仿真场景(10 m/s风速)

    图  4  条带模式理论仿真误差分布

    图  5  TOPS模式理论仿真误差分布

    图  6  理论近似仿真与全链路仿真误差

    图  7  误差沿方位向变化曲线

    表  1  理论仿真系统参数

    仿真系统参数参数值
    平台高度800 km
    基线10 m
    中心频率Ka波段
    极化方式HH
    入射角4°~4.7°
    距离采样率0.8 m
    方位采样率5 m
    距离分辨率1 m
    方位分辨率50 m
    下载: 导出CSV

    表  2  条带模式下误差RMS

    海况RMS(cm)
    低海况0.2670
    中等海况1.3154
    高海况6.6361
    下载: 导出CSV

    表  3  TOPS模式下误差RMS

    海况RMS(cm)
    低海况1.9598
    中等海况2.2621
    高海况6.9801
    下载: 导出CSV

    表  4  实验验证系统参数

    实验系统参数参数值
    平台高度852 km
    基线12 m
    中心频率Ka波段
    极化方式HH
    入射角9°~12°
    带宽65 MHz
    脉冲重复频率3005 Hz
    距离分辨率3 m
    方位分辨率15 m
    下载: 导出CSV
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出版历程
  • 收稿日期:  2019-03-28
  • 修回日期:  2019-08-30
  • 网络出版日期:  2019-09-05
  • 刊出日期:  2020-03-19

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