Study on multi-factor flight conflict detection strategies based on fixation characteristics
In order to study the flight conflict detection strategies under different airspace complexity conditions,a repeated within-subjects measurement experimental scheme with three factors of minimum distance(MD)×convergence angle(CA)×speed characteristics(SC)was designed.The conflict detection strategies adopted by the subjects were judged based on the stable distribution probability of fixation in Markov chain model and the distribution characteristics of fixation duration in the area of interest,and the task performance indexes under different strategies were analyzed.The results show that in the experi-mental scenarios where the convergence angle is larger or the minimum distance is closer to the alarm interval,the subjects prone to adopt the distance-to-velocity ratio(DV)strategy.In the experimental scenarios where the convergence angle is smaller,the minimum distance is shorter,or the aircrafts speed are the same,the subjects prone to adopt the cognitive motion extrapolation(CME)strategy.In most cases,the CME strategy has shorter response time and higher accuracy in judging flight conflict.The research results can provide a reference for improving the perception and prediction ability of conflict detection.
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