In the last two decades rapid changes have occurred in modern space geodesy by the implementation of new observation techniques and the significant improvement of the existing methods. This creates the objective of integrating the results derived by the different geodetic techniques and methods in order to achieve a better understanding of the processes in the System Earth as a whole. Following this global objective in geodetic science, the thesis aims at the development of an integrated two-dimensional model of the upper part of the Earth's atmosphere, the ionosphere, by using and combining different space geodetic data, in particular observations derived by the Global Navigation Satellite System (GNSS) and by satellite altimetry missions operating at two distinct frequencies, such as Topex/Poseidon and Jason-1. Both geodetic techniques allow the observation and modelling of the ionosphere, but each of them has its specific characteristics which influence the derived ionosphere parameters. The classical input data for development of Global Ionosphere Maps (GIM) of the Total Electron Content (TEC) is obtained from dual-frequency GNSS observations. Such maps in general achieve good quality of the ionosphere representation.
However, the GNSS stations are inhomogeneously distributed, with large gaps particularly over the sea surface, which lowers the precision of the GIM over these areas. On the other hand, the dual-frequency satellite altimetry missions provide information about the parameter of the ionosphere precisely above the sea surface, where the altimetry observations are performed. Due to the limited spread of the measurements and some open issues related to systematic errors, the ionospheric data from satellite altimetry is used only for cross-validation of the GNSS GIM. However, some specifics of the ionosphere parameters derived by satellite altimetry can partly balance the inhomogeneity of the GNSS data. Such important features are complementing the global coverage, different biasing and the absence of additional mapping, as it is the case with GNSS. The combination of ionosphere parameter on normal equation basis presented within the thesis allows making best use of the advantages of every particular method, providing a more homogeneous global coverage and higher accuracy and reliability than the results of each single technique.