Abstract
Ionospheric scintillation events seriously affect the performance and availability of the GPS (Global Positioning System) based applications, especially regarding aeronautical navigation. Brazilian territory is localized in a region of intense ionospheric scintillation activity, which prevents, among other space-based applications, precision approach based on GPS service (LPV, Localizer Performance with Vertical Guidance, or LP, Localizer Performance without Vertical Guidance) which requires high integrity and availability of the GPS signal. Thereby, the knowledge of the ionospheric scintillation over the Brazilian territory is a key aspect to verify the feasibility of the use of GPS-based applications that require more precision and availability of the GPS signal. This work presents a statistical investigation of the duration of ionospheric scintillation events over Brazilian territory. The main goal is to propose models capable to estimate the chances that a user of GPS service has to be affected by ionospheric scintillation in a certain period of time. From the models it is possible to make conclusions on the effects of these irregularities and its possible threats.
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