The GNSS (Global Navigation Satellite System) has not been developed as a
meteorological data source provider, but with a careful and sophisticated processing
strategy it might be used as one. The term GNSS tomography refers to the usage of the ray
traced GNSS signal as scanning rays in the tomographic model input. The model is divided
into a number of voxels. The system is inverted and value of refractivity is obtained.
Typically, as in the most of the inverse processing, there is a problem of the undetermined …