A conflict is an infringement of minimum separation between at least two aircraft. The model is based on these assumptions: aircraft fly on level straight line routes, only an infringement of the lateral separation is considered, deviations are excluded, aircraft at the same flight level fly the same average speed, and aircraft fly towards an intersection and may change direction after intersection. Hence, conflicts mainly occur owing to a loss of minimum separation between aircraft flying at the same flight level. Calculation of average number of potential conflicts is designated for long time interval; hence, aircraft velocity deviations are negligible. The mathematical model in this paper is intended to compare different alternatives of intersection configuration of air traffic services routes. The comparison is based on the results: an average number of potential conflicts per hour on intersection of routes, index of conflicts intensity, and intersection capacity.
The objective of ground collision avoidance systems (GCAS) is to assure the separation of aircraft during flight operations, GCAS can be divided into tactical and strategic systems. The term tactical implies conflict prediction made after every radar scan and with approximately a one minute look ahead time. The aim of the study is to build up a mathematical model which uses only radar information and predicts potential conflicts within a fixed time, p, which may differ in different areas.
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