Abstract
AbstractThis paper illuminates the mathematical foundation of time‐dependent three‐dimensional computerized ionospheric tomography (CIT) for reconstructing ionospheric electron density (Ne) from ground‐based GPS beacon measurements. After simplifying the dependence of Ne on time, the formula of 3D parallel‐beam tomography is theoretically deduced and proved to be the 2D CIT inversion formula derived by the reference[10] when it is applied to 2D cases. Furthermore, this paper investigates the effects of limited view angles and finite receiver aperture on recovered images. Specifically, the response to an impulse source function with the established 3D parallel‐beam reconstruction formula under these non‐idealized conditions is numerically computed. The results indicate the feasibility of time‐dependent three‐dimensional CIT to reconstruct Ne from ground‐based GPS beacon measurements.
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