中文摘要：

针对电离层单层模型不能反映电离层垂直结构的特点,利用层析成像方法和2003年中国地壳运动监测网络提供的双频GPS载波相位数据,反演中国区域上空电离层电子密度年变化的时间序列值,分析中国区域上空电离层电子密度的周日变化特性,并研究其在垂直方向上的变化特性以及赤道异常结构的发展和消亡过程;同时讨论了利用GPS资料反演中国区域电离层电子密度所存在的困难和需要进一步解决的问题。

英文摘要：

For the limitations of single-layer ionospheric model,the annual time-series variations of electron density distributions over China are inverted by using the ionospheric tomography technique and the dual-frequency GPS observations from Curstal Movement Observation Network of China（CMONOC） in 2003.The diurnal varying characteristics of ionospheric electron density over China,especially the development and disappearance of the equatorial anomaly core and the variations of the vertical structure of ionosphere are investigated.The difficulties and problems for using GPS data to inverse the electron density profiles in China are discussed and some suggestions are given for further investigation.