Patent ID: 8239077

Claim:
A method for detecting, in an aircraft, the presence of noise in a localizer (LOC) signal, the method comprising: estimating a first lateral speed of the aircraft on the basis of inertial information according to a first set of parameters; estimating at least one second lateral speed of the aircraft on the basis of guide information of the LOC signal according to at least one second set of parameters, among which at least one parameter is of different nature from each parameter of the first set of parameters; comparing the first lateral speed and the at least one second lateral speed and obtaining a difference between the first lateral speed and the at least one second lateral speed; verifying the difference with a threshold; verifying an automatic pilot has been engaged for a sufficient predetermined time; verifying the estimated first lateral speed and the estimated at least one second lateral speed are coherent; and indicating a presence of noise in the LOC signal when the difference between the first lateral speed and the at least one second lateral speed is greater than the threshold and the automatic pilot has been engaged for the sufficient predetermined time and when the estimated lateral speeds are coherent.