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Integrity investigation of global ionospheric TEC maps for high-precision positioning
Journal of Geodesy ( IF 4.4 ) Pub Date : 2021-02-22 , DOI: 10.1007/s00190-021-01487-8
Jiaojiao Zhao , Manuel Hernández-Pajares , Zishen Li , Ningbo Wang , Hong Yuan

Aside from the ionospheric total electron content (TEC) information, root-mean-square (RMS) maps are also provided as the standard deviations of the corresponding TEC errors in global ionospheric maps (GIMs). As the RMS maps are commonly used as the accuracy indicator of GIMs to optimize the stochastic model of precise point positioning algorithms, it is of crucial importance to investigate the reliability of RMS maps involved in GIMs of different Ionospheric Associated Analysis Centers (IAACs) of the International GNSS Service (IGS), i.e., the integrity of GIMs. We indirectly analyzed the reliability of RMS maps by comparing the actual error of the differential STEC (dSTEC) with the RMS of the dSTEC derived from the RMS maps. With this method, the integrity of seven rapid IGS GIMs (UQRG, CORG, JPRG, WHRG, EHRG, EMRG, and IGRG) and six final GIMs (UPCG, CODG, JPLG, WHUG, ESAG and IGSG) was examined under the maximum and minimum solar activity conditions as well as the geomagnetic storm period. The results reveal that the reliability of the RMS maps is significantly different for the GIMs from different IAACs. Among these GIMs, the values in the RMS maps of UQRG are large, which can be used as ionospheric protection level, while the RMS values in EHRG and ESAG are significantly lower than the realistic RMS. The rapid and final GIMs from CODE, JPL and WHU provide quite reasonable RMS maps. The bounding performance of RMS maps can be influenced by the location of the stations, while the influence of solar activity and the geomagnetic storm is not obvious.



中文翻译:

用于高精度定位的全球电离层TEC图的完整性调查

除了电离层总电子含量(TEC)信息以外,还提供了均方根(RMS)图,作为全局电离层图(GIM)中相应TEC误差的标准偏差。由于RMS映射通常用作GIM的精度指标,以优化精确点定位算法的随机模型,因此,调查涉及不同电离层联合分析中心(IAAC)的GIM的RMS映射的可靠性至关重要。国际GNSS服务(IGS),即GIM的完整性。我们通过比较差分STEC(dSTEC)的实际误差与从RMS映射得出的dSTEC RMS来间接分析RMS映射的可靠性。使用这种方法,可以快速建立七个快速IGS GIM(UQRG,CORG,JPRG,WHRG,EHRG,EMRG,和IGRG)和六个最终GIM(UPCG,CODG,JPLG,WHUG,ESAG和IGSG)在最大和最小太阳活动条件以及地磁风暴周期下进行了检查。结果表明,对于来自不同IAAC的GIM,RMS映射的可靠性显着不同。在这些GIM中,UQRG的RMS映射中的值很大,可以用作电离层保护级别,而EHRG和ESAG中的RMS值则明显低于实际RMS。来自CODE,JPL和WHU的快速和最终GIM提供了相当合理的RMS映射。均方根图的边界性能可能受测站位置的影响,而太阳活动和地磁风暴的影响并不明显。ESAG和IGSG)在最大和最小太阳活动条件以及地磁风暴周期下进行了检查。结果表明,对于来自不同IAAC的GIM,RMS映射的可靠性显着不同。在这些GIM中,UQRG的RMS映射中的值很大,可以用作电离层保护级别,而EHRG和ESAG中的RMS值明显低于实际RMS。来自CODE,JPL和WHU的快速和最终GIM提供了相当合理的RMS映射。均方根图的边界性能可能受测站位置的影响,而太阳活动和地磁风暴的影响并不明显。ESAG和IGSG)在最大和最小太阳活动条件以及地磁风暴周期下进行了检查。结果表明,对于来自不同IAAC的GIM,RMS映射的可靠性显着不同。在这些GIM中,UQRG的RMS映射中的值很大,可以用作电离层保护级别,而EHRG和ESAG中的RMS值明显低于实际RMS。来自CODE,JPL和WHU的快速和最终GIM提供了相当合理的RMS映射。均方根图的边界性能可能受测站位置的影响,而太阳活动和地磁风暴的影响并不明显。在这些GIM中,UQRG的RMS映射中的值很大,可以用作电离层保护级别,而EHRG和ESAG中的RMS值明显低于实际RMS。来自CODE,JPL和WHU的快速和最终GIM提供了相当合理的RMS映射。均方根图的边界性能可能受测站位置的影响,而太阳活动和地磁风暴的影响并不明显。在这些GIM中,UQRG的RMS映射中的值很大,可以用作电离层保护级别,而EHRG和ESAG中的RMS值明显低于实际RMS。来自CODE,JPL和WHU的快速和最终GIM提供了相当合理的RMS映射。均方根图的边界性能可能受测站位置的影响,而太阳活动和地磁风暴的影响并不明显。

更新日期:2021-02-23
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