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基于相关功率修正的地基GNSS-R土壤湿度反演

洪学宝 张波 阮宏梁 汉牟田 杨东凯 宋曙辉

洪学宝, 张波, 阮宏梁, 等 . 基于相关功率修正的地基GNSS-R土壤湿度反演[J]. 北京航空航天大学学报, 2021, 47(8): 1558-1564. doi: 10.13700/j.bh.1001-5965.2020.0154
引用本文: 洪学宝, 张波, 阮宏梁, 等 . 基于相关功率修正的地基GNSS-R土壤湿度反演[J]. 北京航空航天大学学报, 2021, 47(8): 1558-1564. doi: 10.13700/j.bh.1001-5965.2020.0154
HONG Xuebao, ZHANG Bo, RUAN Hongliang, et al. Ground-based GNSS-R soil moisture retrieval based on correlation power correction[J]. Journal of Beijing University of Aeronautics and Astronautics, 2021, 47(8): 1558-1564. doi: 10.13700/j.bh.1001-5965.2020.0154(in Chinese)
Citation: HONG Xuebao, ZHANG Bo, RUAN Hongliang, et al. Ground-based GNSS-R soil moisture retrieval based on correlation power correction[J]. Journal of Beijing University of Aeronautics and Astronautics, 2021, 47(8): 1558-1564. doi: 10.13700/j.bh.1001-5965.2020.0154(in Chinese)

基于相关功率修正的地基GNSS-R土壤湿度反演

doi: 10.13700/j.bh.1001-5965.2020.0154
基金项目: 

浙江省基础公益研究计划 LGN19D040001

地理信息工程国家重点实验室开放基金课题 SKLGIE2018-M-2-2

详细信息
    通讯作者:

    张波, E-mail: bozhang@buaa.edu.cn

  • 中图分类号: V19;P237

Ground-based GNSS-R soil moisture retrieval based on correlation power correction

Funds: 

Zhejiang Basic Public Welfare Research Project LGN19D040001

State Key Laboratory of Geo-information Engineering Open Fund Project SKLGIE2018-M-2-2

More Information
  • 摘要:

    利用全球导航卫星系统反射信号测量技术(GNSS-R)进行土壤湿度反演过程中,实际接收天线方向性会造成GNSS直反信号相关功率测量偏差。针对地基观测场景下天线方向性造成的相关功率的类余弦振荡问题,提出了基于多项式拟合的信号相关功率修正方法。为了验证所提方法的有效性,开展了地基GNSS-R土壤湿度观测实验,结果表明:基于多项式拟合的相关功率修正可以消除信号相关功率的类余弦振荡,提升GNSS-R土壤湿度反演中的观测数据有效性和反演结果准确性。

     

  • 图 1  实验场景

    Figure 1.  Experimental scenario

    图 2  GPS与BDS可见星空视图

    Figure 2.  Visible starry sky plots of GPS and BDS satellites

    图 3  修正前后直射和反射信号相关功率

    Figure 3.  Correlation power of direct and reflected signals before and after correction

    图 4  土壤湿度测量结果

    Figure 4.  Soil moisture measurement results

    表  1  数据有效性统计结果

    Table  1.   Statistical results of data validity

    卫星编号 数据总量/个 修正前有效数/个 修正后有效数/个
    GPS PRN21 3 572 2 706 3 572
    BDS PRN7 3 573 2 120 3 573
    BDS PRN32 2 937 2 027 2 937
    总计 10 082 6 853 10 082
    下载: 导出CSV

    表  2  反演结果均方根误差

    Table  2.   RMSE of retrieval results

    卫星编号 未修正结果RMSE/% 修正后结果RMSE/%
    GPS PRN21 13.3 11.1
    BDS PRN7 3.9 3.5
    BDS PRN32 11.0 4.5
    总体 10.5 7.3
    下载: 导出CSV
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出版历程
  • 收稿日期:  2020-04-21
  • 录用日期:  2020-05-25
  • 刊出日期:  2021-08-20

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