# 基于改进的序列梯度–修复算法的飞行器上升段轨迹优化An Improved Gradient-Restoration Sequential Algorithm for Endoatmospheric Ascent Trajectory Optimization

Abstract: An improved sequential gradient-restoration algorithm is developed to solve endoatmospheric ascent trajectory optimization problem. First, the transformation process of trajectory constraints is introduced to accommodate the character that sequential gradient-restoration algorithm can deal with equation constraints only. Then the state integral method is introduced and the update method of the sequential gradient-restoration algorithm is improved to deal with the problem of state solve and update, due to the strong nonlinearity of endoatmospheric ascent dynamics. Finally, the simulation analysis of the improved algorithm ascent trajectory optimization in aircraft atmosphere of practicability is analyzed through simulation under five different scenarios. Simulation results demonstrate the validity and adaptability of the improved algorithm for trajectory optimization with terminal constraints and process constraints.

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