Affiliations: Centre National d'Etudes Spatiales, 18, avenue Ed. Belin, 31401 Toulouse Cedex 9, France E-mail: [email protected] | European Space Agency, TEC-EEP, PB 299, NL-2200 AG Noordwijk, The Netherlands E-mail: [email protected]
Abstract: This paper presents briefly the interaction between the ionosphere and the navigation signals, the ionosphere activity with its different effects and when possible a guideline on the different models that encompass the relevant effect.