2000年7月15日magnetic storm期间中纬度GPS夜间性能的个例研究
A case study of the mid-latitude GPS performance at nighttime during the magnetic storm of July 15, 2000
摘要：
以2000年7月15日的磁暴为例，研究了中纬度地区GPS导航系统在夜面的性能与地磁扰动水平的关系。调查是根据通过互联网提供的全球全球定位系统的数据进行的。结果表明，GPS相位滑移的数量随着扰动水平的增加而增加，并且Dst变化率与滑移频率之间存在良好的相关性。进一步表明，滑动的相对频率也具有明显的方位依赖性。GPS信号的相位滑移可能是由电离层E层的小尺度不规则散射引起的。相位滑移特征表明Farley-Buneman不稳定性是一种合理的物理机制，是负责形成地磁场对齐的不规则性。使用同时测量的后向散射信号的特性，从伊尔库茨克非相干散射雷达和现有的模型，这种不规则性，我们估计的数量级的预期相位波动的GPS信号在几度。
英文摘要：
Using the geomagnetic storm of July 15, 2000 as an example, we investigated the dependence of GPS navigation system performance on the nightside at mid-latitudes on the level of geomagnetic disturbance. The investigation was based on the data from the global GPS system available through the Internet. It was shown that the number of GPS phase slips increases with the increasing level of disturbance and that there is a good correlation between the rate of Dst-variation and the frequency of slips. It was further shown that the relative frequency of slips has also a clearly pronounced aspect dependence. Phase slips of the GPS signal can be caused by the scattering from small-scale irregularities of the ionospheric E-layer. Phase slip characteristics are indicative of Farley-Buneman instabilities as a plausible physical mechanism that is responsible for the formation of geomagnetic field-aligned irregularities. Using simultaneous measurements of backscatter signal characteristics from the Irkutsk incoherent scatter radar and existing models for such irregularities, we estimated the order of magnitude of the expected phase fluctuations of the GPS signal at a few degrees.
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