空基投放高超声速飞行器的上升巡航轨迹优化

In this paper，we have studied the dodge-flying trajectory optimization problem for an air-based hypersonic vehicle with propulsion. Considering the task, the whole flight is divided into two segments: ascent phase and cruise phase. 3-DOF notion model is established based on each phase's kinetic characters. According to the longest-range performance objective, the infinite dimensional optimization problem is transferred into finite dimensional nonlinear-programming problem (NLP) using direct collocation method. Finally，we design a sequential-division strategy and solve the NLP problem using sequential quadratic programming (SQP) method . Meanwhile，the accuracy of optimization results is assessed by using the interpolated control to integrate the state equations. The numerical result demonstrates that，the optimization results meet the mission. The proposed sequential-division strategy speeds up the convergence and calculation is efficient. The error between the simulation result and optimization is within one in a thousand.