Wide-frequency Domain Position Actuation Control Signal Detection System Based on Wavelet Transform

The landing gear is one of the important components of the aircraft. It plays a key role in the safe take-off and soft landing of the aircraft. The pilot receives the position of the proximity sensor from the PACU (Position Actuation Control Unit) after issuing the command of the landing gear. The opening of the EE door and the retraction of the landing gear are controlled by the signal. In this thesis, the PACU ground simulator is designed for the PACU system of a certain type of aircraft landing gear. The ground simulator is used to obtain the wide frequency domain response signal and surrounding vibration noise signals of certain light aircraft model of the PACU proximity sensor. The wavelet transformed method is used to eliminate the vibration noise. The noise reduction processing is performed, and the curve of noise-reduced signal is compared with the curve of real signal. It is shown that error is within range. After testing, the ground simulator has a good function and the system is stable.