Integrity investigation of global ionospheric TEC maps for high-precision positioning
Integrity investigation of global ionospheric TEC maps for high-precision positioning
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全球电离层TEC地图完整性调查以实现高精度定位
DOI：
10.1007/s00190-021-01487-8
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发表时间：
2021-02
影响因子：
4.4
通讯作者：
Zishen Li
中科院分区：
文献类型：
--
作者：
Jiaojiao Zhao;Manuel Hern;ez Pajares;Zishen Li
除了电离层总电子含量（TEC）信息外，还提供了均方根（RMS）图，作为全球电离层图（GIM）中相应TEC误差的标准差。由于RMS图通常被用作GIM的精度指标，以优化精密单点定位算法的随机模型，因此研究国际GNSS服务（IGS）的不同电离层相关分析中心（IAAC）的GIM所涉及的RMS图的可靠性至关重要，即，GIM的完整性。通过比较差分STEC（dSTEC）的实际误差与从RMS图导出的dSTEC的RMS，间接分析了RMS图的可靠性。利用该方法，在太阳活动最大、最小和磁暴期间，对7个快速IGS GIM（UQRG、CORG、JPRG、WHRG、EHRG、EMRG和IGRG）和6个最终GIM（UPCG、CODG、JPLG、WHUG、ESAG和IGSG）的完整性进行了检验。结果表明，RMS地图的可靠性是显着不同的GIM从不同的IAAC。在这些GIM中，UQRG的RMS图中的值较大，可以用作电离层保护水平，而EHRG和ESAG的RMS值明显低于现实RMS。CODE、JPL和WHU的快速和最终GIM提供了相当合理的RMS图。RMS图的定界性能受台站位置的影响，而太阳活动和磁暴的影响不明显。
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.
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