IGS电离层产品的时空特性研究

Research on the Spatio-temporal Characteristics of IGS Ionospheric Products

电离层时空变化规律的研究对于卫星导航、航空航天等具有重要价值。本文利用国际GNSS服务(IGS)产品,分析了电离层的时空变化规律。在时间尺度上,对低阶球谐系数(0,0)、(1,0)、(1,1)、(1,-1)进行了功率谱分析,对北京地区的垂直方向总电子含量(VTEC)进行了短时傅里叶变换分析,对北京、阿克拉和墨尔本进行了季节性分析,结果表明,电离层变化具有明显的年周期和半年周期项。在空间方面,分析了零度子午线、赤道上的电离层延迟随纬度、经度的变化规律,结果表明,在纬度方向上具有明显的单峰效应,在经度方向上的峰值具有延迟变化规律。

The research on the temporal and spatial variation of ionosphere has important value for satellite navigation, aerospace and so on. This article uses international GNSS services （IGS） products, analyze the ionospheric temporal and spatial variation. On the time scale, doing the Power spectrum analysis on the low-order spherical harmonic coefficient of （0,0）.（1,0）.（1,1）,（1,-1）, and the short-time Fourier transform of the total vertical elec- tron content （VTEC） in the Beijing area was analyzed. Seasonal analyzes were conducted in Beijing, Accra and Melbourne, the results show that ionospheric changes have obvious annu- al and semiannual cycles. In the space aspect, the variation rules of the latitude and longitude of the ionosphere delay on the zero meridian and equator are analyzed. The results show that there is a single peak effect in the latitudinal direction, and the peak value in the longitude direction has a delay variation