A dynamic 3D trajectory optimization of continuous descent approach for low fuel consumption

Compared with traditional step-down approach procedure, continuous descent approach (CDA) can save fuel and reduce noise. This article presents a method to generate dynamic CDA trajectories in three-dimensional space with optimal fuel consumption. The optimization range of this method is from the IAF to the FAF. When the aircraft enters the terminal area, it can dynamically generate a lateral path according to the real-time status of the aircraft and the obstacle information. Then, it generates the optimal fuel consumption CDA vertical profile. At last, it establishes the available 3D trajectory. This trajectory can be real-time to ensure the safety of the aircraft, and only need near idle thrust which can save fuel. Simulations are performed to show the effectiveness of our method.