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基于极大验后推估理论的全球电离层地图预报

刘昂 王宁波 李子申 张研 李昂

刘昂, 王宁波, 李子申, 张研, 李昂. 基于极大验后推估理论的全球电离层地图预报[J]. 空间科学学报, 2022, 42(6): 1089-1099. doi: 10.11728/cjss2022.06.210812085
引用本文: 刘昂, 王宁波, 李子申, 张研, 李昂. 基于极大验后推估理论的全球电离层地图预报[J]. 空间科学学报, 2022, 42(6): 1089-1099. doi: 10.11728/cjss2022.06.210812085
LIU Ang, WANG Ningbo, LI Zishen, ZHANG Yan, LI Ang. Prediction of Global Ionospheric Map Using the Theory of Maximum Posterior Estimation (in Chinese). Chinese Journal of Space Science, 2022, 42(6): 1089-1099 doi: 10.11728/cjss2022.06.210812085
Citation: LIU Ang, WANG Ningbo, LI Zishen, ZHANG Yan, LI Ang. Prediction of Global Ionospheric Map Using the Theory of Maximum Posterior Estimation (in Chinese). Chinese Journal of Space Science, 2022, 42(6): 1089-1099 doi: 10.11728/cjss2022.06.210812085

基于极大验后推估理论的全球电离层地图预报

doi: 10.11728/cjss2022.06.210812085
基金项目: 国家自然科学基金项目(42074043)和中国科学院仪器专项(YJKYYQ20190071)共同资助
详细信息
    作者简介:

    刘昂:E-mail:liuang@aircas.ac.cn

  • 中图分类号: P352

Prediction of Global Ionospheric Map Using the Theory of Maximum Posterior Estimation

  • 摘要: 提出了一种基于极大验后估计理论的全球电离层预报方法,基于中国科学院电离层分析中心(CAS)提供的快速全球电离层地图(GIM),实现了1天、2天和5天GIM的预报。以国际GNSS服务组织(IGS)最终GIM、Jason测高卫星提供的电离层观测信息及全球GNSS基准站实测电离层总电子含量(TEC)为基准,评估了2008-2017年CAS电离层预报GIM在全球大陆及海洋区域的精度,并与欧洲定轨中心(CODE)、欧洲空间局(ESA)和西班牙加泰罗尼亚理工大学(UPC)的预报GIM进行对比。在评估时段内,与IGS-GIM相比,CAS预报GIM精度为2.4~3.1 TECU;与测高卫星TEC相比,CAS预报GIM的精度为5.1~6.6 TECU;与全球基准站实测TEC相比,CAS预报GIM的电离层延迟修正精度优于80%。总体来看,CAS预报GIM与CODE预报GIM精度相当,显著优于ESA和UPC预报GIM。

     

  • 图  1  电离层零阶球谐系数时间序列及其功率谱分析

    Figure  1.  Zero-order spherical harmonic coefficient time series and its spectrum analysis diagram

    图  2  不同预报GIM与IGSG相比电离层VTEC残差频率分布的直方图(2015年6月29 日06:00:00 UTC)

    Figure  2.  Ionospheric TEC residual histogram of different predicted GIMs compared to IGSG at 06:00:00 UTC on 29 June 2015

    图  3  2008-2017年CAS,CODE,ESA,UPC预报1天和2天GIM的RMS序列

    Figure  3.  RMS series of CAS/CODE/ESA/UPC 1- and 2-day predicted GIMs compared to IGS-GIM during 2008-2017

    图  4  不同预报GIM随地理纬度和地方时的分布

    Figure  4.  Global VTEC map in geographic latitude and local time coordinates

    图  5  不同预报GIM与Jason-2 VTEC相比残差随地理纬度和地方时的分布

    Figure  5.  Different predicted GIMs difference map in geographic latitude and Local Time (LT) coordinates compared to Jason-2 VTEC

    图  6  不同预报GIM与Jason-2 TEC 相比的Bias(a)和 STD(b)随时间的变化

    Figure  6.  Different predicted GIMs bias (a) and STD (b) with time compared to Jason-2 TEC

    图  7  预报的GIM-TEC与实测的测站上空TEC对比

    Figure  7.  Comparison between the predicted GIM-TEC and the measured TEC over the station

    表  1  2008-2017年CAS,CODE,ESA,UPC预报1天和2天GIM与IGS-GIM相比的精度统计

    Table  1.   Analysis result of CAS, CODE, ESA, UPC 1- and 2-day predicted GIMs compared with IGS-GIM from 2008 to 2017

    机构 测评时长/d精度/TECU相对误差/(%)
    偏差STDRMS
    CASP13640–0.792.793.0618.7
    CODP13636–0.682.783.0218.4
    ESAP11885–0.983.864.1321.4
    CASP23640–0.732.142.4519.7
    CODP23637–0.581.982.3218.5
    ESAP21848–0.963.023.3322.1
    UPCP219190.583.444.3226.8
    下载: 导出CSV

    表  2  2008-2016年CAS,CODE,ESA 及UPC 预报GIM与Jason-2 TEC 相比的精度统计

    Table  2.   Analysis result of CAS, CODE, ESA and UPC predicted GIMs compared with Jason-2 TECs during 2008-2016

    机构 测评时长/d精度/TECU相对误差/(%)
    偏差STDRMS
    CASP130740.414.795.0925.3
    CODP130700.314.885.1725.8
    ESAP118690.435.876.0827.8
    CASP230740.424.895.3126.4
    CODP230710.384.855.1926.0
    ESAP218360.466.126.4929.6
    UPCP218881.995.476.6728.5
    CASP530740.485.976.5832.6
    下载: 导出CSV

    表  3  CODE与CAS预报GIM与实测的dSTEC相比的精度统计

    Table  3.   Analysis result of CODE and CAS predicted GIMs compared with GPS-dSTEC

    机构精度/TECU相对误差/(%)
    偏差STDRMS
    CASP10.062.322.4016.9
    CODP10.162.352.4316.5
    CASP20.072.352.4417.4
    CODP20.132.342.4916.9
    CASP50.072.812.9120.6
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-08-11
  • 录用日期:  2021-12-03
  • 修回日期:  2022-03-30
  • 网络出版日期:  2022-12-01

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