Research On Multiple Aircraft Collision Risk Considering CNS Performance Under Free Flight

The risk assessment ofmultiple aircraft co llision based on CNS perfor mance under free flight is mainly studied this thesis.Free flight can improve airspace capacity and ease airspace congestion.To ensure the safe ope ration of the aircraft under free flight,the aircraft collision risk needs to study.The current situation o f free flight developm ent at hom e and abroadis summ arized,analyzing the influencing factors of position error in free flight,and establishing the multiple aircraft collision risk model based on the positioning error.The main contents of the study are the following three parts:(1)For the high traffic density of the airspace environment,the characteristics of aircraft positioning error are d escribed by Brownian motion.Based on th e relative m otion,the collision risk model based on position error is improved to the m athematical model suitable for the oper ation of multiple aircraft.Respectively,the model based on the hor izontal and vertical projection plane.Finally,the trapezoidal m ethod is used to solve the m odel,and the influence of the model parameters on the collision risk is obtained.(2)Considering the influence factors of aircraft positioning error,the aircraft positioning error is corrected by using the com plementary technology of inertial navigation system(INS)and global positioning system(GPS),and the modified positioning error is changed with time.Based on this,a m ultiple aircraft collision risk model based on aircraft position error correction under free flight is established.A simple example is used to prove that the collision risk is optimized.(3)According to the ru nning status of several aircraft,the traditional conflict area is extended to the convex polygon conflict area with high traffic density by using the geometric principle,and the multiple aircraft collision risk model is established.The collision under the given safety target level is obtained by an example risk.