中文摘要：

为了建立电离层延迟模型来确定电离层对电磁波传播的影响，以电子密度的分布为研究对象，根据基本折射理论分析电离层的色散效应，对电离层延迟原因进行分析，研究电离层总电子含量TEC（Total Electron Content）对其影响，并且此影响与卫星信号频率有关。利用GPS双频接收机和投影函数建立电离层的单层VTEC（Vertical Total Electron Content）多项式模型，在大庆进行实地连续观测获取相关数据，建立了大庆地区的电离层延迟模型。总结VTEC昼夜变化规律，并对结果进行了分析和说明。

英文摘要：

In order to determine the effect of ionosphere on electromagnetic propagation by setting up the ionospheric delay model, we take the distribution of electron density for studying object, analyse the dispersion effect of ionosphere according to the basic refraction theory, and analyse the cause of the ionospheric delay. We study the influence of total electron content （TEC） in ionosphere on it, and such effect is related to the satellite signal frequency. Then we use dual-frequency GPS receiver and projection function to build the ionospheric polynomial model for vertical total electron content （VTEC）, and carry out consecutive filed observation to collect the correlated data in Daqing, and build the ionospheric delay model in this region. After that, we summarise the rule of diurnal variation of VTEC. The results are then analysed and explained.