强地磁暴对印多尔上空 NavIC 信号的影响
Impact of Intense Geomagnetic Storm on NavIC Signals Over Indore
AI总结：
本文研究2017年9月8日强地磁暴期间印多尔地区的 NavIC 信号闪烁，结合地磁指数、S4 指数与 L5 载噪比观测，揭示其导致定位精度下降。
摘要：
强地磁暴会对任何全球导航卫星系统（GNSS）发射的信号产生强烈影响，这种影响被称为电离层闪烁。本文报道了在印多尔地区开展的首批 NavIC 信号闪烁研究，其成因是2017年9月8日世界时0151和1304报告的强地磁暴事件。行星指数以及 DST 指数的变化表明2017年9月8日发生了强地磁暴；其中 DST 指数在当日降至 -124 nT。所给出的观测是在位于赤道异常峰区的印多尔进行的。同址布设的 GNSS 接收机的 S4 指数测量显示，在受扰日世界时15时至18时之间，S4 值达到0.5或以上。所呈现的分析清楚表明，在同一时段内 NavIC L5 信号的载噪比测量性能下降，进而影响了 NavIC 的定位精度，而这是性能评估中的一项重要考虑因素。
英文摘要：
Intense geomagnetic storms can have a strong impact on the signals (termed ionospheric scintillations) emitted by any global navigation satellite system (GNSS). The paper reports the first studies of scintillations at the Indore region on the NavIC signals due to the impact of the intense geomagnetic storm event reported on September 8, 2017, at 0151 and 1304 UT. The variation of the planetary indices as well as the DST index which dropped to a value of -124 nT on September 8, 2017, indicates the occurrence of an intense geomagnetic storm on September 8, 2017. The observations presented are carried out at Indore, which is located at the equatorial anomaly crest. The S4 index measurements of colocated GNSS receiver showed values of 0.5 or above on the disturbed day between 15 and 18 UT. The analysis presented clearly signifies the degradation of the carrier to noise measurements of the NavIC L5 signal during the same time, which in turn affected the positional accuracy of NavIC, an important consideration for performance.
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