Multi-objective optimization of continuous descending trajectories in flexible airspace

Continuous Descending Operation (CDO), an important part of the concept Trajectory Based Operation (TBO), has a significant effect on reducing fuel consumption and noise impact in the airport terminal airspace. Simple, efficient, flexible airspace structure, and highly automatic conflict-free and energy saving trajectory planning are the core elements for the realization of CDO in high-density terminal airspace. We design a new type of airspace named Inverted Crown-Shaped Arrival Airspace (ICSAA) adapted from Point Merge and its operational procedures. Based on the ICSAA, a conflict-free continuous descending trajectory optimization model is established to minimize both fuel consumption and travel time, which is efficiently solved by the adapted NSGA-Ⅱalgorithm. The results demonstrate strong and reliable performance of the proposed trajectory optimization in the new airspace in supporting pre-tactical and tactical operations in complex traffic scenarios, thereby improving flight efficiency, economy and airspace capacity, and further providing a new perspective and method for promoting the application of CDO to high-density airports. © 2021, Beihang University Aerospace Knowledge Press. All right reserved.