Method and device for filtering windshears alarms for an aircraft

A detection system for filtering alarms originating from a windshear detection system, embedded in an aircraft, the detection system being able to emit an alarm and the aircraft comprising at least one sensor allowing acquisition of an angle of attack, the detection system for filtering alarms comprising:

• means for calculation of a second derivative of the angle of attack,
• means for comparison of a term related to the second derivative of the angle of attack with a threshold C1,
• means for evaluating whether the term related to the second derivative of the angle of attack exceeds the threshold C1 over a duration greater than a time threshold T, which comprise:
• a first pathway comprising a first opening gate linked to the comparison means and able to suppress an alarm for a first duration T1 and a first confirmer able to authorize an output of the alarm for a second duration T2,
• a second pathway comprising a second opening gate linked to the comparison means and able to suppress the alarm for the first duration T1 and a second confirmer able to authorize an output of the alarm for the second duration T2, one of the two pathways being used while the other is in an initialization state,
• means for suppressing the alarm originating from the windshear detection system based on outputs of the first and second pathway.