On correlation between SID monitor and GPS-derived TEC observations during a massive ionospheric storm development

M. Filic, R. Filjar
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引用次数: 5

Abstract

Space weather, geomagnetic and ionospheric conditions are the most prominent single cause of the Global Navigation Satellite System (GNSS) positioning performance degradation, through introduction of the GNSS signal ionospheric delay. This affects numerous GNSS-based technology and socio-economic systems and services. Analyses of case-studies of GNSS positioning performance degradation contribute to characterization of the GNSS positioning error, and support error correction methods and models development. Here a case of rapidly developing ionospheric storm is examined, with the aim of the event characterization using a low-cost Sudden Ionospheric Disturbance (SID) monitor observations of lower ionospheric levels condition through continuous reception of Very Low Frequency (VLF) signal strength values. Time series of observations, taken in Croatia during the St Patrick 2015 event of fast development of the large ionospheric storm, were compared with time series of dual-frequency GPS-derived observations of Total Electronic Content (TEC), a parameter linearly related to GNSS ionospheric delay. A comparison framework has been developed in the open-source R programming framework for statistical computing. Time series of SID and GNSS-based TEC observations were examined for cross-correlation. The research revealed correspondence between two time series. Although not linear, the correspondence identified may be used for an early warning for potential GNSS positioning performance deterioration. Further to this, it may serve as the foundation for understanding of the lower ionosphere contribution to the over-all TEC, and thus to formation of the GNSS ionospheric delay. Our team intends to explore both research directions in forthcoming studies.
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大规模电离层风暴发展过程中SID监测与gps衍生TEC观测的相关性研究
空间天气、地磁和电离层条件是全球导航卫星系统(GNSS)定位性能下降的最突出的单一原因,通过引入GNSS信号电离层延迟。这影响到许多基于全球导航卫星系统的技术和社会经济系统及服务。GNSS定位性能下降的案例分析有助于GNSS定位误差的表征,并支持误差校正方法和模型的开发。本文研究了一个快速发展的电离层风暴,目的是利用低成本的电离层突然扰动(SID)监测仪通过连续接收甚低频(VLF)信号强度值来观测电离层水平较低的情况。将2015年圣帕特里克大电离层风暴快速发展期间在克罗地亚进行的时间序列观测与GNSS电离层延迟线性相关的总电子含量(TEC)双频gps衍生观测的时间序列进行了比较。在开放源代码的R编程框架中开发了一个用于统计计算的比较框架。对SID和基于gnss的TEC观测的时间序列进行了互相关检验。这项研究揭示了两个时间序列之间的对应关系。虽然不是线性的,但所确定的对应关系可用于潜在的GNSS定位性能恶化的早期预警。此外,它可以作为理解电离层对总体TEC的较低贡献的基础,从而理解GNSS电离层延迟的形成。我们的团队打算在接下来的研究中探索这两个研究方向。
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