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星下点观测的星载卫星导航反射信号海面风矢量极大似然估计

王峰 李建强 张国栋 张琦 杨东凯

王峰, 李建强, 张国栋, 张琦, 杨东凯. 星下点观测的星载卫星导航反射信号海面风矢量极大似然估计[J]. 电子与信息学报, 2024, 46(4): 1418-1427. doi: 10.11999/JEIT230464
引用本文: 王峰, 李建强, 张国栋, 张琦, 杨东凯. 星下点观测的星载卫星导航反射信号海面风矢量极大似然估计[J]. 电子与信息学报, 2024, 46(4): 1418-1427. doi: 10.11999/JEIT230464
WANG Feng, LI Jianqiang, ZHANG Guodong, ZHANG Qi, YANG Dongkai. Maximum Likelihood Estimation of Ocean Wind Vector Using Subsatellite-Observation Spaceborne Global Navigation Satellite System-Reflectometry[J]. Journal of Electronics & Information Technology, 2024, 46(4): 1418-1427. doi: 10.11999/JEIT230464
Citation: WANG Feng, LI Jianqiang, ZHANG Guodong, ZHANG Qi, YANG Dongkai. Maximum Likelihood Estimation of Ocean Wind Vector Using Subsatellite-Observation Spaceborne Global Navigation Satellite System-Reflectometry[J]. Journal of Electronics & Information Technology, 2024, 46(4): 1418-1427. doi: 10.11999/JEIT230464

星下点观测的星载卫星导航反射信号海面风矢量极大似然估计

doi: 10.11999/JEIT230464
基金项目: 博士后创新人才支持计划(BX20200039),上海市产业协同创新项目(2021-cyxt2-kj05)
详细信息
    作者简介:

    王峰:男,博士后,研究方向为卫星导航应用

    李建强:男,研究员,研究方向为运载技术

    张国栋:男,工程师,研究方向为卫星导航系统

    张琦:男,高级工程师,研究方向为运载技术

    杨东凯:男,教授,研究方向为卫星导航应用

    通讯作者:

    杨东凯 yangdongkai@sina.com

  • 中图分类号: TN87; P237

Maximum Likelihood Estimation of Ocean Wind Vector Using Subsatellite-Observation Spaceborne Global Navigation Satellite System-Reflectometry

Funds: China National Postdoctoral Program for Innovative Talents (BX20200039), Shanghai Industrial Collaborative Innovation Project (2021-cyxt2-kj05)
  • 摘要: 该文针对星载全球导航卫星反射计(GNSS-R)镜面反射信号对海面风向不敏感导致海面风向反演难问题,分析非镜向海面散射信号特征,提出星下点非镜向观测模式,定义该模式下海面风矢量敏感特征观测量,在此基础上提出基于星载GNSS-R海面风矢量极大似然估计(MLE)反演算法直接利用两颗及以上导航卫星的星下点非镜向散射信号进行海面风矢量的反演,并提出风矢量搜索算法提高反演效率。通过搭建星载GNSS-R仿真平台验证算法的可行性和评估算法性能。结果表明:所提算法可直接利用非镜向独立观测模式下的多颗导航卫星散射信号反演得到海面风速和风向;多星观测可消除观测几何导致的模糊解从而将海风风向4个模糊解降至2个模糊解,但无法消除海浪谱的对称性导致的海面风向模糊解。在2~25 m/s的风速内,当信噪比(SNR)大于11 dB时,3星观测的风速均方根误差(RMSE)优于2 m/s,风向的均方根误差优于15°。
  • 图  1  镜向模式与非镜向观测模式示意图

    图  2  星载GNSS-R本地坐标系示意图

    图  3  海面散射系数随散射角的变化

    图  4  不同散射角的海面散射系数随海面风向的变化

    图  5  镜向和非镜向散射系数与海面风速和海面风向的关系

    图  6  星下点非镜向观测模式散射信号信噪比与入射角的关系

    图  7  星下点非镜向DDMA与海面风向的关系

    图  8  多星非镜向观测示意图

    图  9  双星观测海面风矢量反演结果

    图  10  海面风向反演多模糊解示意图

    图  11  3星观测海面风矢量反演结果

    图  12  双星观测海面风矢量反演精度与信噪比的关系

    图  13  3星观测海面风矢量反演精度与信噪比的关系

    表  1  星下点非镜向配置参数表

    符号参数
    $ {P_{\text{t}}} $发射信号功率26.8 W
    $ {G_{\text{t}}} $发射天线增益12.1 dB
    $ {h_{\text{t}}} $发射机高度20 200 km
    $ {h_{\text{r}}} $接收机高度510 km
    $ {G_{\text{r}}} $接收天线增益12.1 dB
    $ {T_{{\text{coh}}}} $相干积分时间1 ms
    $ {N_{{\text{incoh}}}} $非相干累加次数1 000
    ${D_{\text{c}}}$检测因子26.3
    $ {f_{\text{B}}} $接收机带宽2.5 MHz
    ${T_{{\text{eff}}}}$等效温度25°C
    ${\theta _{\text{i}}}$入射角[0,90°]
    $ {\varphi _{\text{w}}} $风向90°
    $ {u_{10}} $风速5~20 m/s
    下载: 导出CSV
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出版历程
  • 收稿日期:  2023-05-22
  • 修回日期:  2023-12-15
  • 网络出版日期:  2023-12-23
  • 刊出日期:  2024-04-24

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