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基于加权最小二乘的合成孔径高度计重跟踪估计器设计与验证

王佳明 许可 蒋茂飞

王佳明, 许可, 蒋茂飞. 基于加权最小二乘的合成孔径高度计重跟踪估计器设计与验证[J]. 电子与信息学报, 2022, 44(6): 2135-2142. doi: 10.11999/JEIT210354
引用本文: 王佳明, 许可, 蒋茂飞. 基于加权最小二乘的合成孔径高度计重跟踪估计器设计与验证[J]. 电子与信息学报, 2022, 44(6): 2135-2142. doi: 10.11999/JEIT210354
WANG Jiaming, XU Ke, JIANG Maofei. Design and Verification of Retracking Estimator for Synthetic Aperture Altimeter Based on Weighted Least Squares[J]. Journal of Electronics & Information Technology, 2022, 44(6): 2135-2142. doi: 10.11999/JEIT210354
Citation: WANG Jiaming, XU Ke, JIANG Maofei. Design and Verification of Retracking Estimator for Synthetic Aperture Altimeter Based on Weighted Least Squares[J]. Journal of Electronics & Information Technology, 2022, 44(6): 2135-2142. doi: 10.11999/JEIT210354

基于加权最小二乘的合成孔径高度计重跟踪估计器设计与验证

doi: 10.11999/JEIT210354
详细信息
    作者简介:

    王佳明:男,1994年生,博士生,研究方向为合成孔径高度计数据处理技术

    许可:男,1967年生,博士,研究员,博士生导师,研究方向为星载雷达高度计系统技术、合成孔径雷达高度计系统技术和信号处理技术

    蒋茂飞:男,1989年生,博士,助理研究员,研究方向为雷达高度计数据处理及应用

    通讯作者:

    许可 xuke@mirslab.cn

  • 中图分类号: TN951

Design and Verification of Retracking Estimator for Synthetic Aperture Altimeter Based on Weighted Least Squares

  • 摘要: 重跟踪是提取高度计回波信号精确参数估计的重要步骤,现有的合成孔径雷达(SAR)高度计重跟踪估计器主要基于最小二乘法。该方法未考虑高度计各距离单元的统计特性不同对参数估计精度的影响,同时现有的加权最小二乘重跟踪估计器使用半解析模型,计算效率低,不利于应用于业务化。对此,该文利用合成孔径高度计解析化的合成孔径高度计研究与应用(SAMOSA)回波模型设计了新的加权方法,通过加权处理使高度计各距离单元的统计特性达到一致,进而提高了重跟踪估计器的测距和有效波高估计精度。该文利用Sentinel-3A卫星数据进行了验证,验证结果也表明了测距和有效波高这两个参数的估计精度均有提高:在2 m有效波高下,测距精度提高9%,有效波高精度提高了11%;在4 m有效波高下,测距精度提高13%,有效波高精度提高了20%。
  • 图  1  SAMOSA模型示意图

    图  2  不同有效波高的SAMOSA模型

    图  3  数据处理流程图

    图  4  重跟踪拟合波形

    图  5  距离精度随有效波高的变化

    图  6  有效波高精度随有效波高的变化

    图  7  后向散射系数精度随有效波高的变化

    表  1  加权最小二乘重跟踪距离精度提高统计

    ${H_{\rm{s}}}$(m)最小二乘重跟踪距离精度(cm)加权最小二乘重跟踪距离精度(cm)精度提升(%)
    21.11.09
    41.51.313
    62.01.715
    下载: 导出CSV

    表  2  加权最小二乘重跟踪有效波高精度提高统计

    ${H_{\rm{s}}}$(m)最小二乘重跟踪有效波高精度(m)加权最小二乘重跟踪有效波高精度(m)精度提升(%)
    20.090.0811
    40.100.0820
    60.120.118
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-04-25
  • 修回日期:  2021-08-12
  • 网络出版日期:  2021-09-03
  • 刊出日期:  2022-06-21

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