火星着陆轨迹优化与进入状态分析

Entry state analysis is a beneficial method in satisfying landing accuracy and path constraints and achieving safety and reliability in Mars landing mission design. Considering the influence of entry vehicle parameters on entry trajectory, and furthermore, the generation of nominal trajectory and entry state, this paper takes the Gauss pseudospectral method as the method of trajectory optimization firstly, and then analyzes the influence of terminal altitude, lift-to-drag ratio and ballistic coefficient of entry vehicle, terminal Mach number and load factor constraint on the entry state distribution. This work can be beneficial for selection of entry vehicle parameter, feasible entry state and nominal trajectory generation in Mars entry mission design.