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涌浪及降雨影响下的GNSS海面反射信号建模

吴迪 张波 李博闻

吴迪, 张波, 李博闻等 . 涌浪及降雨影响下的GNSS海面反射信号建模[J]. 北京航空航天大学学报, 2020, 46(1): 141-149. doi: 10.13700/j.bh.1001-5965.2019.0125
引用本文: 吴迪, 张波, 李博闻等 . 涌浪及降雨影响下的GNSS海面反射信号建模[J]. 北京航空航天大学学报, 2020, 46(1): 141-149. doi: 10.13700/j.bh.1001-5965.2019.0125
WU Di, ZHANG Bo, LI Bowenet al. Modeling of GNSS-R signal under effects of swell and rain[J]. Journal of Beijing University of Aeronautics and Astronautics, 2020, 46(1): 141-149. doi: 10.13700/j.bh.1001-5965.2019.0125(in Chinese)
Citation: WU Di, ZHANG Bo, LI Bowenet al. Modeling of GNSS-R signal under effects of swell and rain[J]. Journal of Beijing University of Aeronautics and Astronautics, 2020, 46(1): 141-149. doi: 10.13700/j.bh.1001-5965.2019.0125(in Chinese)

涌浪及降雨影响下的GNSS海面反射信号建模

doi: 10.13700/j.bh.1001-5965.2019.0125
基金项目: 

国家自然科学基金 41774028

详细信息
    作者简介:

    吴迪, 女, 硕士研究生。主要研究方向:GNSS-R理论与应用、GNSS信号仿真

    张波, 男, 博士, 讲师, 硕士生导师。主要研究方向:扩频通信、卫星导航及其应用等

    李博闻, 男, 博士研究生。主要研究方向:GNSS-R理论与应用、GNSS信号仿真

    通讯作者:

    张波, E-mail:bozhang@buaa.edu.cn

  • 中图分类号: TN967.1

Modeling of GNSS-R signal under effects of swell and rain

Funds: 

National Natural Science Foundation of China 41774028

More Information
  • 摘要:

    全球导航卫星系统(GNSS)海面反射信号的模拟仿真采用的海浪谱多为风驱模型,而忽略了真实复杂环境中涌浪、降雨的影响。为此,提出了一种涌浪、降雨影响下的GNSS海面反射信号模型。首先,对Elfouhaily海浪谱、涌浪谱、降雨谱分别进行仿真,从海浪谱的角度分析涌浪、降雨对GNSS反射信号的影响。然后,设计了引入涌浪、降雨影响因子后的GNSS反射信号建模的方法,并建立噪声模型。最后,对星载场景下仿真得到的二维时延-多普勒相关功率分布图像(DDM)、时延相关功率波形(DW)进行分析,并与英国技术演示卫星(UK TDS-1)实测数据的处理结果进行了对比验证。结果表明:涌浪主要形成对GNSS反射信号影响较大的大尺度粗糙海面,而降雨对GNSS反射信号影响较小;仿真的DDM与实测数据结果的波形有很好的一致性,DW对比的相关系数达到0.92,优于未修正模型的对比结果,模拟的反射信号更为真实,证明了提出的GNSS反射信号建模方法的可行性、有效性。对真实复杂环境下的GNSS反射信号建模及GNSS反射信号星载探测应用研究具有一定的参考意义和实用价值。

     

  • 图 1  不同风速下的Elfouhaily海浪谱

    Figure 1.  Elfouhaily wave spectrum at different wind speeds

    图 2  风驱、涌浪驱动的Elfouhaily海浪谱

    Figure 2.  Wave spectrum driven by Elfouhaily wind and swell

    图 3  风驱、降雨驱动的海浪谱

    Figure 3.  Wave spectrum driven by wind and rain

    图 4  复杂环境下GNSS反射信号建模研究框图

    Figure 4.  Block diagram of GNSS reflected signal modeling in complex environment

    图 5  基于Elfouhaily海浪谱的二维随机海面

    Figure 5.  Two-dimensional random sea surface based on Elfouhaily wave spectrum

    图 6  散射系数的计算流程图

    Figure 6.  Flowchart of scattering coefficient calculation

    图 7  仿真的复杂环境下的GNSS反射信号二维时延-多普勒相关功率分布图像

    Figure 7.  Simulated two-dimensional DDM of GNSS reflected signal in complex environment

    图 8  仿真的复杂环境下的GNSS反射信号一维时延相关功率波形

    Figure 8.  Simulated one-dimensional DW of GNSS reflected signal in complex environment

    图 9  模型仿真及UK TDS-1数据处理所得二维时延-多普勒相关功率分布图像

    Figure 9.  Two-dimensional DDM obtained from model simulation and UK TDS-1 data processing

    图 10  模型仿真及UK TDS-1数据处理所得一维时延相关功率波形

    Figure 10.  One-dimensional DW obtained from model simulation and UK TDS-1 data processing

    表  1  UK TDS-1真实数据参数

    Table  1.   UK TDS-1 real data parameters

    数据ID 时刻 风速/(m·s-1) 仰角/(°) 天线增益/dB
    RD000002/TD000008 2014-09-0120:24:00 5 63.8 12
    下载: 导出CSV
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出版历程
  • 收稿日期:  2019-03-27
  • 录用日期:  2019-07-20
  • 刊出日期:  2020-01-20

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