Abstract: Aiming at the problem of skip reentry trajectory planning, and considering the initial state deviations and the uncertainty of the atmosphere’s parameters, a modeling method for the reentry trajectory optimization problem with state augmention is proposed. The constraints of dynamic pressure, load factor and heating rate are redefined by transforming path constraint into equality constraint. Moreover, the augmented reentry model and the extended augmented reentry model are established respectively to ensure the adaptability of the reentry trajectory optimization problem to initial shift and parameter disturbance. Numerical simulations demonstrate that the proposed method has the robustness to the initial state deviations and the uncertainty of the atmosphere’s parameters, the constraints of dynamic pressure, load factor and heating rate satisfy the design requirements, and the trajectory is precisely planned to the desired landing point, therefore it has good engineering background and significance.

Key words: skip reentry trajectory, redundant reentry model, extended redundant reentry model, robustness