Abstract: The paper was aimed at increasing the capacity of air traffic management systems by developing a new method for measurement of air traffic situation risk based on the theory of complex network.The aircraft,waypoints,and airways were regarded as nodes,and the risk relations among these nodes as edges,a dynamic weighted network model was built.Air traffic situation risk was defined as the sum of weights of all edges in the network.The physical significance of the risk relationships between elements and the detailed modeling process were demonstrated and discussed by some typical practical cases to verify the validity of the model and algorithm.The results indicate that air traffic situation risk increases with the enhancement of the convergence between aircraft,the proximity of aircraft with waypoints,and the deviation of aircraft from the airway,and vice versa,and that this method considering the effects of both airspace and traffic flow can objectively quantify air traffic situation risk.

Key words: air traffic management, risk assessment, complex network, weighted network, dynamic network