一种时变三维电离层CT算法

An algorithm of time-dependent 3-D computerized ionospheric tomography

提出了利用GPS观测数据获得时变三维电离层电子密度分布的一种CT反演算法。对GPS地面接收台网的合理布设进行了初步的尝试 ,在此基础上 ,利用实际的GPS射线路径和通过IRI90模式计算得到的TEC进行了模拟反演 ,得到了电子密度在一小时内随时间、空间变化的图像。通过与IRI90模式直接得到的电子密度分布图像进行比较 ,证明该算法能重现原始模型中的特征 。

In this paper a CT algorithm of recovering time-dependent 3-D ionospheric electron density distributions by using GPS observations is suggested. A primary attempt is made to set ground network of GPS receivers appropriately. Furthermore, simulation is performed to obtain the images of ionospheric electron density spatio-temporal distributions during the interval of one hour by using actual GPS propagation paths and TEC calculated with IRI90 model. The results indicate that the algorithm can recover the characters of the original model and the quality of the reconstruction is rather good compared with the images of electron density distributions from IRI90 model directly.