1. A method for fusing measurements of an aircraft flight parameter based on a first set of main measurements taken by a first set of main sensors and a plurality of second sets of secondary measurements taken by second sets of secondary sensors, the first set of main measurements exhibiting a greater degree of accuracy than the plurality of second sets of secondary measurements, the method comprising: at a processor configured to receive the first set of main measurements taken by the first set of main sensors and the plurality of second sets of secondary measurements taken by the second sets of secondary sensors: calculating a discrepancy between each of the main measurements and the secondary measurements; determining, by the discrepancy, a score of consistency of each of the main measurements with the secondary measurements; performing, for each possible fault configuration of the main sensors, a first, conditional estimation of the aircraft flight parameter based on the main measurements taken by the main sensors which are not faulty; determining, for each fault configuration, a weighting coefficient based on the score of consistency of the main measurements; performing a second estimation of the aircraft flight parameter by weighting the first, conditional estimations relating to the fault configurations by the weighting coefficients corresponding to these fault configurations; and outputting the second estimation of the aircraft flight parameter to one or more systems of the aircraft.