极区电离层GPS信号闪烁特征统计分析

Statistical analyses on characteristics of GPS signal scintillation in high latitude ionosphere

对意大利高纬电离层闪烁监测网2004年全年的电离层闪烁数据进行分析,通过计算GPS信号振幅和相位闪烁在给定强度变化范围内的发生率,研究太阳活动低年GPS信号L1频标电离层振幅、相位闪烁的发生率及其时空分布随电离层总电子含量、不同季节的气候学变化特征。结果表明:在高纬地区,电离层相位闪烁比振幅闪烁更容易发生;在极盖区,相位闪烁的季节性特征较为明显;不同的电离层总电子含量变化率可导致产生不同类型的电离层闪烁。

The ionospheric scintillation data which were obtained from the monitoring network of INGV （Istituto Nazionale di Geofisica e vulcanologia） of Italy in 2004 are analysed in this paper. The change characteristics of spatial and temporal distribution of amplitude and phase scintillation of Ll-band frequency of GPS with different variation of ionospheric total electron content （TEC）, different seasons as well as other related space parameters at the low solar activity are compared by calculating the incidence of amplitude and phase scintillation of signals of Global Position Sys- tem （GPS） within a given intensity range. Results show that the phase scintillation is more likely to take place than the amplitude scintillation at high-latitude, the seasonal change feature for the phase scintillation is more obviously in polar cap, and meanwhile different rate of change of the total electron content may lead to different types of ionospheric scintillation.