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基于TechDemoSat-1卫星的GPS反射信号海面高度反演

张云 马德皓 孟婉婷 郑俏 杨树瑚

张云, 马德皓, 孟婉婷, 等 . 基于TechDemoSat-1卫星的GPS反射信号海面高度反演[J]. 北京航空航天大学学报, 2021, 47(10): 1941-1948. doi: 10.13700/j.bh.1001-5965.2020.0357
引用本文: 张云, 马德皓, 孟婉婷, 等 . 基于TechDemoSat-1卫星的GPS反射信号海面高度反演[J]. 北京航空航天大学学报, 2021, 47(10): 1941-1948. doi: 10.13700/j.bh.1001-5965.2020.0357
ZHANG Yun, MA Dehao, MENG Wanting, et al. Sea surface height inversion of GPS reflected signal based on TechDemoSat-1 satellite[J]. Journal of Beijing University of Aeronautics and Astronautics, 2021, 47(10): 1941-1948. doi: 10.13700/j.bh.1001-5965.2020.0357(in Chinese)
Citation: ZHANG Yun, MA Dehao, MENG Wanting, et al. Sea surface height inversion of GPS reflected signal based on TechDemoSat-1 satellite[J]. Journal of Beijing University of Aeronautics and Astronautics, 2021, 47(10): 1941-1948. doi: 10.13700/j.bh.1001-5965.2020.0357(in Chinese)

基于TechDemoSat-1卫星的GPS反射信号海面高度反演

doi: 10.13700/j.bh.1001-5965.2020.0357
基金项目: 

国家自然科学基金 41376178

国家自然科学基金 41401489

详细信息
    通讯作者:

    杨树瑚, E-mail: shyang@shou.edu.cn

  • 中图分类号: P228.4

Sea surface height inversion of GPS reflected signal based on TechDemoSat-1 satellite

Funds: 

National Natural Science Foundation of China 41376178

National Natural Science Foundation of China 41401489

More Information
  • 摘要:

    针对星载GPS反射信号(GPS-R)海面测高的误差问题,基于星载GPS-R实测数据进行星载海面测高模型和误差修正模型的研究,并验证其有效性。利用TechDemoSat-1(TDS-1)数据,使用时延多普勒图(DDM)海面高度反演技术,着重分析了星载GPS-R海面高度反演中的各类误差,并建立了相应的误差模型。对星载GPS-R海面高度反演模型进行优化,采用DTU15全球平均海面模型、DTU全球海潮模型验证反演精度。结果证明:优化后反演模型得到的全球海面高度反演结果的平均绝对误差(MAD)为6.05 m,精度提高了约29%,有效提高了海面高度反演的精度。研究成果对于推广星载GNSS反射信号(GNSS-R)的海面测高应用具有一定的意义。

     

  • 图 1  星载GPS-R海面高度反演几何原理

    Figure 1.  Geometric principles of satellite-borne GPS-R sea surface height inversion

    图 2  影响GPS-R信号的主要误差

    Figure 2.  Main errors affecting GPS-R signal

    图 3  考虑接收机和发射机运动的几何模型

    Figure 3.  Geometric model considering receiver motion and transmitter motion

    图 4  TDS-1数据处理流程

    Figure 4.  TDS-1 data processing flow

    图 5  DDM示例

    Figure 5.  An example of DDM

    图 6  归一化能量值插值后多普勒频率为零的切片

    Figure 6.  Slice with zero Doppler frequency after normalized energy interpolation

    图 7  误差修正前后的结果对比

    Figure 7.  Comparison of results before and after error correction

    图 8  测量的平均海面高度(南大西洋海域)

    Figure 8.  Mean sea surface height measurement(South Atlantic)

    图 9  验证模型的平均海面高度(南大西洋海域)

    Figure 9.  Mean sea surface height of verification model(South Atlantic)

    图 10  反演得到的全球平均海面高度误差统计

    Figure 10.  Error statistics of global average sea surface height obtained by retrieval

    表  1  TDS-1卫星参数

    Table  1.   Parameters of satellite TDS-1

    参数 数值
    天线极化 天顶天线(L1/L2)、天底天线
    采样率/MHz 16.367
    轨道高度/km 635
    轨道倾角/(°) 98.4
    下载: 导出CSV

    表  2  误差因素及补正方法

    Table  2.   Error factors and correction methods

    误差项 延迟误差绝对值/m 补正方法
    电离层 < 15 国际参考电离层模型
    对流层 < 7 大气延迟模型
    天基线姿态误差 < 1 TDS-1 Metadata数据
    GPS卫星轨道误差 < 3 SP3精密星历
    TDS-1卫星轨道误差 < 2 TDS-1 Metadata数据
    反射信号延迟误差 < 10 反射信号几何模型
    TDS-1卫星数据偏差 < 50 TDS-1 Metadata数据
    海面粗糙度 < 10 HALF方法
    下载: 导出CSV

    表  3  筛选参数及范围

    Table  3.   Filter parameters and scope

    参数 保留数据范围
    信噪比/dB >-5
    天线增益/dB >5
    仰角/(°) >60
    下载: 导出CSV
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出版历程
  • 收稿日期:  2020-07-24
  • 录用日期:  2020-10-16
  • 刊出日期:  2021-10-20

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