Abstract: In order to prevent air traffic control incidents, fatigue warning mechanism of controllers is studied by using voice data of radiotelephony communication and PVT method. Firstly, effective control instruction information was intercepted and redefined speed speed, tone and other features were extracted from audio files of radiotelephony communication during training process of control simulator. Then, controllers' response capability before and after each training was tested by using PVT method, and speech features and PVT test results were compared. Finally, change trend of speech features in each time period was observed with box chart statistics, absolute and relative speech feature intervals under fatigue state were analyzed by k-means ++ algorithm, and safety red line was proposed based on observation on change process of controllers' fatigue. The research shows that the proposed method can provide early fatigue warning and therefore prevent incidents and improve safety management by effectively monitoring controllers' work state through their voice features.

Key words: air traffic control, radiotelephony communication, voice, fatigue, psychomotor vigilance task (PVT)