CALIBRA is a project dedicated to investigate applicable solutions to mitigate the impact of ionospheric disturbances on high accuracy GNSS positioning techniques based on the signal carrier phase. Algorithm and methods were developed to tackle the problem. Several experiments were carried out in the field of Precision Agriculture, Surveying and offshore applications; together with data collection from a network of supporting the ionospheric scintillation monitoring in order to tests the proposed alternatives. The initial results were presented and published in several conferences and congress as well as in appropriated journals. Few of these results can be found at the publications list available at http://is-cigala-calibra.fct.unesp.br and at http://calibra-ionosphere.net/.