| dc.description.abstract | The main of this paper is a simulation of three-dimensional (3-D) computerized ionospheric tomography (CIT), which is consider of the earth curvature, in the equatorial anomaly characteristics (EAC) region. We applied IRI-90 model as initial electron density distribution of ionosphere, and choose the date October 19, in the time of LT 0600, LT1800, LT1200, and LT2400. The reconstructed region is over a altitude range of 125 to 1000 km, a latitude range of 0° to 50° N, and a longitude range of 116° to 124° E. There are 36×101×9 pixels. Choose nine ground stations separated at different longitude and equally separated at latitude.
The process is started from the simulation of satellite’s trajectories, and we determine the data of Doppler’s phase shift for every receiver station. These are original data of this study, then, we make a projection of the relative STEC to the plane of satellite’s trajectories, and use the two stations method to obtain the reconstructed integer constants. Horizontal distribution is using back projection method. Vertical distribution is using alpha Chapman layer. Then use MART algorithm to reconstruct the 3-D images in the sphere coordinate of ionospheric electron density.
The max error is happened in the receiver, which is in the EAC region. The error is come from the number of receiver, the geometry relationship between the satellite and reconstruct region, the interpolation method, the initial data, the lack of prior information, and so on. | en_US |