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FY-3D卫星的北斗掩星分布特征与误差特性

刘艳 孟祥广 白伟华 孙越强 廖蜜 韩英

刘艳, 孟祥广, 白伟华, 孙越强, 廖蜜, 韩英. FY-3D卫星的北斗掩星分布特征与误差特性[J]. 空间科学学报, 2022, 42(3): 476-484. doi: 10.11728/cjss2022.03.210208019
引用本文: 刘艳, 孟祥广, 白伟华, 孙越强, 廖蜜, 韩英. FY-3D卫星的北斗掩星分布特征与误差特性[J]. 空间科学学报, 2022, 42(3): 476-484. doi: 10.11728/cjss2022.03.210208019
LIU Yan, MENG Xiangguang, BAI Weihua, SUN Yueqiang, LIAO Mi, HAN Ying. Analysis of Beidou Radio Occultation Data from FY-3D Satellite (in Chinese). Chinese Journal of Space Science, 2022, 42(3): 476-484. DOI: 10.11728/cjss2022.03.210208019
Citation: LIU Yan, MENG Xiangguang, BAI Weihua, SUN Yueqiang, LIAO Mi, HAN Ying. Analysis of Beidou Radio Occultation Data from FY-3D Satellite (in Chinese). Chinese Journal of Space Science, 2022, 42(3): 476-484. DOI: 10.11728/cjss2022.03.210208019

FY-3D卫星的北斗掩星分布特征与误差特性

doi: 10.11728/cjss2022.03.210208019
基金项目: 科技部国家重点研发项目(2018 YFC1506702)和中国气象局GRAPES数值天气预报模式发展专项共同资助
详细信息
    作者简介:

    刘艳:E-mail:liuyan@cma.gov.cn

  • 中图分类号: P356

Analysis of Beidou Radio Occultation Data from FY-3D Satellite

  • 摘要: 利用2018年1-3月FY-3D卫星的掩星折射率数据,研究了北斗导航卫星系统的掩星分布特点、数据精度以及误差统计特征。北斗导航卫星系统同步静止轨道掩星沿卫星轨道呈弧状分布在南北两极地区,倾斜轨道掩星在东西半球低纬度地区分别形成一小一大两个空洞,中地球轨道掩星则全球均匀分布。北斗掩星折射率数据精度在探测核心区域,即12~32 km范围内,与ERA5再分析资料计算的折射率相比,平均偏差的标准差约为1.5%,在核心区外,标准差从1.5%逐渐增大到6%。静止轨道掩星的平均偏差在高层略大于倾斜轨道和中地球轨道掩星。下降掩星在20 km以上区域的标准差大于上升掩星,20 km以下区域小于上升掩星。高纬地区北斗掩星标准差最小,低纬地区最大,对流层中下层尤其明显。分析结果表明,北斗掩星的数据精度和误差特征与GPS掩星数据相似。

     

  • 图  1  2018年1月1日至3月31日期间FY-3D卫星北斗掩星事件的水平分布(蓝点为静止轨道掩星,红点为倾斜轨道掩星,绿点为中地球轨道掩星)

    Figure  1.  Horizontal distribution of Beidou RO events in FY-3D satellite from 1 January to 31 March in 2018 (Blue dots respresent GEO RO, red dots represent IGSO RO, and green dots represent MEO RO)

    图  2  FY-3D卫星每天的北斗掩星数量

    Figure  2.  Numbers of Beidou RO in FY-3D satellite

    图  3  FY-3D的北斗掩星探测到的平均最低高度

    Figure  3.  Average minimum altitude detected by FY-3D’s Beidou occultation

    图  4  质量控制前(红色)/后(黑色)的折射率数据

    Figure  4.  Refractivity before (red) and after (black) quality control

    图  5  观测总数(黑实线)以及折射率观测与ERA5再分析资料计算的折射率平均偏差(红虚线)和标准差(红实线)。O表示观测折射率,B表示ERA5计算的折射率

    Figure  5.  Mean bias (red dashed line) and standard deviation (red solid line) of refractivity compared with ERA5 reanalysis, and the number (black solid line). O stands for observation refractivity, and B stands for the refractivity based on ERA5 reanalysis

    图  6  GEO、IGSO和MEO掩星与ERA5再分析资料计算的折射率的平均偏差(虚线)和标准差(实线)

    Figure  6.  Mean bias (dashed line) and standard deviation (solid line) of GEO,IGSO and MEO refractivity compared with ERA5 reanalysis

    图  7  上升掩星和下降掩星与ERA5再分析资料计算的折射率的平均偏差(虚线)和标准差(实线)

    Figure  7.  Mean bias (dashed line) and standard deviation (solid line) of rising and setting refractivity compared with ERA5 reanalysis for GEO, IGSO and MEO, respectively

    图  8  不同区域的掩星观测与ERA5计算折射率的平均偏差(虚线)和标准差(实线)(a)以及掩星数量(b)

    Figure  8.  Mean bias (dashed line) and standard deviation (solid line) (a) of RO refractivity compared with ERA5 reanalysis and RO number (b) in low, middle and high latitudes, respectively

    表  1  不同轨道的GNOS北斗掩星数量和占比

    Table  1.   Number and proportion of GNOS Beidou RO in different orbits

    轨道类型 全球东半球西半球
    GEO IGSO MEO GEO IGSO MEO GEO IGSO MEO
    掩星数量 4038 5292 3768 3412 3591 2224 626 1701 1544
    占比/(%) 31 40 29 26 27 17 5 13 12
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-02-08
  • 录用日期:  2021-10-08
  • 修回日期:  2021-12-19
  • 网络出版日期:  2022-05-26

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