Performance Analysis of Global Ionosphere/TEC Models Over Islamabad

Maria Mehmood, Usama Ahmed, N. A. Naqvi
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Abstract

GNSS signals are severely affected by the ionosphere layer and accurate assessment of the ionosphere delay is necessary for accurate positioning. In return, the GNSS technology may be used to estimate the total electron content (TEC) parameter in the ionosphere that can provide insight to space weather. Various organizations provide global TEC maps based on empirical data that can be used to assess the local TEC. For regions with no GNSS/GPS stations (such as for Pakistan), the GNSS users must only rely on these international models. Reliability of two such global models: International Reference Ionosphere (IRI)-2016 and Global Ionosphere Maps (GIM) by International GNSS Service (IGS), was assessed over Islamabad region. The local GPS TEC was measured for one month using a dual frequency GPS receiver installed at Islamabad as a reference. Analysis revealed that: (1) GIM overestimates the TEC whereas IRI-2016 underestimates it. In absence of local GNSS data, (2) IRI-2016 correlates better to actual TEC as compared to GIM. It was therefore concluded that in absence of local GPS –TEC, IRI-2016 is a better option to measure TEC at Islamabad.
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伊斯兰堡上空全球电离层/TEC模式性能分析
GNSS信号受到电离层的严重影响,准确评估电离层延迟是准确定位的必要条件。反过来,GNSS技术可用于估计电离层中的总电子含量(TEC)参数,从而提供对空间天气的洞察。各种组织根据可用于评估当地TEC的经验数据提供全球TEC地图。对于没有GNSS/GPS站的地区(如巴基斯坦),GNSS用户只能依靠这些国际模型。在伊斯兰堡地区评估了两个全球模型的可靠性:国际参考电离层(IRI)-2016和国际GNSS服务(IGS)的全球电离层地图(GIM)。使用安装在伊斯兰堡的双频GPS接收器作为参考,对当地GPS TEC进行了一个月的测量。分析表明:(1)GIM高估了TEC,而IRI-2016低估了TEC。在缺乏本地GNSS数据的情况下,(2)与GIM相比,IRI-2016与实际TEC的相关性更好。因此得出结论,在没有当地GPS -TEC的情况下,IRI-2016是在伊斯兰堡测量TEC的更好选择。
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