Study on Collision Risk Assessment of Free Flight Based on CNS Performances
摘要
Free flight can improve the utilization of airspace, and the upgrading of communication, navigation and surveillance (CNS) systems has provided tremendous power to accelerate the realization of free flight. In this paper, directed towards the collision risk assessment under free flight environment, the three-dimensional coordinates of the aircraft random time were studied, and time variable were added to the three-dimensional reference system. The human intervention of automatic dependent surveillance (ADS) and aircraft position error caused by CNS performance were considered. Hereby, collision risk assessment model of free flight based on CNS performances was established. The computation formula of longitudinal overlap probability, lateral overlap probability and vertical overlap probability were deduced. At last, the effectiveness of the model was verified by the practical example, the computation results consistent with the standard.