Introduction to CALIBRA

CALIBRA (Countering GNSS high Accuracy applications Limitations due to Ionospheric disturbances in BRAzil) project was submitted within the FP7-GALILEO-2011-GSA-1a call, performed by ESA (European Space Agency). This project is a continuity of CIGALA (Concept for Ionospheric Scintillation Mitigation for Professional GNSS in Latin America) project that was approved from a similar call amd was finalized in February 2012. The project partners from Europe are University of Nottingham (UNOTT), Nottingham/UK, National Institute of Geophysics and Volcanology (INGV), Rome/Italy, University of New Gorica (UNG), Slovenia, and the company Septentrio Satellite Navigation (SSN), Belgium. From Brazil, are participating FCT / UNESP and company ConsultGEL (CSG). The project started in November 2012 with duration of two years.

CALIBRA's objectives are the development and implementation (at receiver level) of algorithms that can be applied to the GNSS carrier phase observable, as well as strategic improvements in positioning and navigation algorithms for carrier phase based applications (RTK, PPP and derivations) to counter the effects of ionospheric disturbances, considering the harsh conditions encountered in Brazil.

Considering the research and the development level, CALIBRA project is divided in five Work Packages (WPs) according to the flow diagram presented in Figure 1. In addition there are two more WPs: the WP600 related with Dissemination and Awareness, whose main results are available at and and WP700 related to the Project management (leaded by UNOTT).

Figure 1: Flow diagram of CALIBRA Project