Study Of Trunk Route Network Planning Method Based On Improved Gravity Model

Since the reform and opening up, China's civil aviation has been developing rapidly. At present, China's international routes have radiated to major countries and regions such as Japan and South Korea, Southeast Asia, Europe and North America,the domestic trunk routes link hub airports with others, and the feeder routes connect each regions together. The route network with trunk route, regional trunk and feeder routes has formed initially. Trunk route network plays an important role in the route network that takes 65% of the traffic with 30% of the leg.However, the existing route network has been exposing its structural weaknesses with the growing of air transport demand and air traffic flow: structure is simple and route capacity can easily saturated. Therefore, this paper is to design the trunk route network from a optimization aspect to solve the problem which was of great practical significance.Firstly, the gravity model is improved based on the characteristics of civil aviation industry by replacing the parameter M with a score from the city's comprehensive strength evaluation system for civil aviation transport and replacing the parameter D with a civil aviation development impedance function. Analyzing the problem with composite indicators instead of single indicators.Secondly, the unlimited trunk route network is built with the improved gravity model to redesign the trunk route network from a overall perspective.Then, a airspace grid model is constructed considering the limit of the prohibited,restricted and danger areas and searching a shortest path of avoiding the former three areas utilizing ant colony algorithm. In this way, a three-areas-limited trunk route network is established.Finally, comparing the performance indexes with the current network, it shows that the final designed network is superior to that of current one on total length ofnetwork, utilization rate of route and network security. It proves that it's feasible to build the trunk route network with this method.