电离层掩星观测中，当低轨卫星(LEO)轨道高度较低时，轨道以上的电离层电子总含量(TEC)对掩星反演的影响不能忽略。
When the low-Earth orbit (LEO) satellite is low, the contribution of the Total Electron Contents (TEC) above the satellite is not neglectable for inversion of GPS-LEO ionospheric occultation.
平静状态下电离层总电子含量(TEC)随时间的变化通常可以视为平稳随机过程。
Usually, ionospheric Total Electron Conten (TEC) variation with time can be viewed as a stationary random process under quiet conditions.
在高纬地区，由于电离层闪烁，从TEC时间变化曲线提取不出来总电子含量增加值。
Due to the ionospheric scintillation, the TEC enhancement couldn't be derived from temporal TEC variation curves in the high latitudes.
基于电离层总电子含量与太阳活动性之间的线性相关关系，利用在新乡长期测量所得的电离层总电子含量的资料，得出了总电子含量的一种经验模式。
Based on the linear correlation between the ionospheric total electron content (TEC) and solar activity, an empirical model of the TEC is derived using the measured data of the TEC at Xinxiang.
该模型经适当修正，即可求出任意时刻电离层总电子含量。
The TEC value of the ionosphere at any time can be calculated while the model has been modified appropriately.
该模型经适当修正，即可求出任意时刻电离层总电子含量。
The TEC value of the ionosphere at any time can be calculated while the model has been modified appropriately.
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