THE WAVELET EXTRAPOLAfION TECHNIQUEUSED IN TRANSFORM RECONSTRUCTION FORCOMPUTERIZED IONOSPHERIC TOMOGRAPHY

The limitations caused by data acquisition system geometry in computerizedionospheric tomography (CIT) in general bring some problems such as incompletedata obtained, nonuniform samples in pseudo-projections, incomplete spectrum infrequency domain. If direct FOurier method is used for reconstruction, the nonuniform samples in pseudo-projections must be uniformed and unknown region in twodimensional frequency domain must be estimated. With reference of Fourier extrapolation technique, the wavelet extrapolation technique is presented in this paper.Theoretical analysis and simulation are also shown, they demonstrate inverse abilityand feasibility of the method. Both theoretical analysis and reconstruction resultsshow much superiority of the wavelet transform extrapolation technique.