A new function-based computerized ionospheric tomography algorithm

A new function-based computerized ionospheric tomography (CIT) algorithm for beacon measurements from satellite is proposed in this paper. It employs relative TEC measurements as input source data, and spherical harmonic function (SHF) and empirical orthogonal functions (EOF) as the basis function to represent spatial and temporal variation of ionosphere. Truncated singular value decomposition (TSVD) regularization is proposed for solving the ill-posed matrix inversion problem. The accuracy and reliability of this algorithm has been verified by simulated results.