Low latitude ionospheric tomography based on the multi-station method

As an important parameter in the process of ionospheric tomography, TEC (Total Electron Content) plays an important role in the high accuracy inversion of the ionospheric electron density. In this paper, two methods are introduced to calculate the absolute TEC including two-station method and multi-station method. Then we make a thorough performance evaluation for these two methods. After the computation of absolute TEC, the MART method is used to analyze the ionospheric electron density in the mid and low latitude regions. So we can find the variation of electron density with latitude and the differences between day and night from the measure data.