Pilot Fatigue Evaluation Based on Eye-Movement Index and Performance Index.

Flight fatigue has always been an important factor affecting flight safety, but how to control and identify the state of fatigue is still an unsolved problem. The aim of this study is to explore the changing rules of eye-movement indicator and performance indicator of pilots under fatigue state by building a fatigue model of task load to excite fatigue, so as to provide reference for fatigue identification and evaluation. Thirty participants attended the experiment, which was required to complete three sets of flight parameters dynamic monitoring and control mission of varying difficulty in a controlled laboratory environment. The eye-movement indicators (blink duration time, average saccade amplitude, average pupil diameter) and performance indicators (accuracy, response time) of 30 subjects were measured in three groups of tasks. The experimental results showed that the blink duration time, average saccade amplitude, average pupil diameter and response time were all significantly affected by fatigue, but the accuracy rate was not significantly affected. According to the analysis of experimental data, it is concluded that the blink duration time increases first and then decreases with the increase of fatigue degree. Saccade amplitude average decreased with the increase of fatigue degree. Pupil diameter size decreases gradually with fatigue degree. These eye-movement indexes show good significance and can be used as good indicators to identify and evaluate fatigue state. Fatigue degree also has a significant effect on the response time. When the task load exceeds a certain degree, the response time will increase exponentially, which seriously affects the operation speed of pilot. The experimental results have important reference significance for the identification and evaluation of pilot fatigue.