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星载GNSS-R土壤湿度反演中开放水域的影响

杨文涛 徐天河 王娜子 高凡 荆丽丽 贺匀峤

杨文涛,徐天河,王娜子,等. 星载GNSS-R土壤湿度反演中开放水域的影响[J]. 北京航空航天大学学报,2023,49(7):1779-1786 doi: 10.13700/j.bh.1001-5965.2021.0479
引用本文: 杨文涛,徐天河,王娜子,等. 星载GNSS-R土壤湿度反演中开放水域的影响[J]. 北京航空航天大学学报,2023,49(7):1779-1786 doi: 10.13700/j.bh.1001-5965.2021.0479
YANG W T,XU T H,WANG N Z,et al. Influence of open water in retrieval of soil moisture by spaceborne GNSS-R[J]. Journal of Beijing University of Aeronautics and Astronautics,2023,49(7):1779-1786 (in Chinese) doi: 10.13700/j.bh.1001-5965.2021.0479
Citation: YANG W T,XU T H,WANG N Z,et al. Influence of open water in retrieval of soil moisture by spaceborne GNSS-R[J]. Journal of Beijing University of Aeronautics and Astronautics,2023,49(7):1779-1786 (in Chinese) doi: 10.13700/j.bh.1001-5965.2021.0479

星载GNSS-R土壤湿度反演中开放水域的影响

doi: 10.13700/j.bh.1001-5965.2021.0479
基金项目: 国家自然科学基金(41604003,41704017,41704018,41874032,41931076);国家重点研发计划(2020YFB0505800)
详细信息
    通讯作者:

    E-mail: thxu@sdu.edu.cn

  • 中图分类号: P237

Influence of open water in retrieval of soil moisture by spaceborne GNSS-R

Funds: National Natural Science Foundation of China (41604003,41704017,41704018,41874032,41931076);National Key R & D Program of China (2020YFB0505800)
More Information
  • 摘要:

    通过星载全球导航卫星系统-反射测量(GNSS-R)技术可以获取高时空分辨率的土壤湿度(SM)信息,但开放水域会影响反演结果的精度。针对此问题,提出一种开放水域剔除的改进方法。校正其模拟功率得出反射率,结合掩膜数据精确剔除开放水域。为验证改进方法的可行性,处理了2个开放水域比较密集的试验区内为期一年的飓风全球导航卫星系统(CYGNSS) 1级数据。反演结果与主被动土壤湿度(SMAP)3级土壤湿度产品进行对比分析,其均方根误差为0.052 1 cm3/cm3,相关性为0.654。与开放水域剔除前的结果相比分别提升6.2%和9%;与CYGNSS官方发布的产品相比分别提升32%和24%。反演结果可以作为SMAP的SM补充,提供高时间分辨率的SM值。

     

  • 图 1  GSWE的季节性产品

    Figure 1.  GSWE's seasonal products

    图 2  巴拉那河流域和博多河流域光学影像

    Figure 2.  Optical images of Paraná river basin and Bodo river basin

    图 3  入射角与反射率的关系

    Figure 3.  Relationship between incident angle and reflectivity

    图 4  在开放水域中的镜面反射点

    Figure 4.  Specular reflection point in open water

    图 5  巴拉那河流域和博多河流域2020年1月~2020年2月的反射率

    Figure 5.  Reflectivity of Paraná river basin and bodo river basin from january to february 2020

    图 6  巴拉那河流域和博多河流域开放水域剔除后的反射率

    Figure 6.  Reflectivity after removing open water in Paraná river basin and Bodo river basin

    图 7  巴拉那河流域和博多河流域的反演结果的相关性分析

    Figure 7.  Correlation analysis of retrieval results of Paraná river basin and Bodo river basin

    图 8  巴拉那河流域和博多河流域的反演结果的RMSE分析

    Figure 8.  Retrieval results of Paraná river basin and Bodo river basin, respectively root mean square error analysis

    图 9  CYGNSS反演结果与SMAP土壤湿度值的比较

    Figure 9.  Comparison of CYGNSS retrieval results and SMAP soil moisture

    表  1  式(4)中变量和所对应的CYGNSS数据集参数

    Table  1.   Variables in Eq. (4) and corresponding CYGNSS dataset parameters

    变量CYGNSS数据集参数
    $ {P}_{\mathrm{r}}^{\mathrm{t}}{G}^{\mathrm{t}} $gps_eirp
    $ {G}^{\mathrm{r}} $sp_rx_gain
    $ {R}_{\mathrm{t}\mathrm{s}} $tx_to_sp_range
    $ {R}_{\mathrm{s}\mathrm{r}} $rx_to_sp_range
    下载: 导出CSV

    表  2  开放水域剔除后的CYGNSS的SM反演结果

    Table  2.   CYGNSS of SM retrieval results after removing open water

    区域RRMSE/ (cm3·cm−3)
    巴拉那河流域0.616 70.045 8
    博多河流域0.673 40.056 2
    2个区域总计0.653 70.052 1
    下载: 导出CSV

    表  3  未考虑开放水域CYGNSS的SM反演结果

    Table  3.   CYGNSS of SM inversion results without considering open water

    区域RRMSE/ (cm3·cm−3)
    巴拉那河流域0.57000.0477
    博多河流域0.63130.0589
    2个区域总计0.60190.0553
    下载: 导出CSV

    表  4  UCAR\CU的SM反演结果

    Table  4.   Retrieval results of SM from UCAR\CU

    区域RRMSE/ (cm3·cm−3)
    巴拉那河流域0.522 10.085 0
    博多河流域0.529 60.073 6
    2个区域总计0.527 60.076 8
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-08-23
  • 录用日期:  2021-11-05
  • 网络出版日期:  2021-11-17
  • 整期出版日期:  2023-07-31

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