Rapid Adaptive Planning of Glide Trajectory Based on Inverse Dynamics

To meet the velocity and mission adaptation requirements of hypersonic glide vehicles, a rapid adaptive trajectory planning method for hypersonic glide vehicles was designed in this study based on the basic concept of inverse dynamics. First, the geometric trajectory was designed according to the dynamic characteristics to meet the basic mission requirements. Then, starting from the complete dynamic model, the geometric trajectory control variables were determined and mapped to a three-dimensional flight corridor that reflects the flight constraints. The geometric trajectory was thereby guaranteed to meet the flight constraints at the dynamic level. At the same time, an analytical expression for state prediction based on the geometric curve was derived to rapidly predict the process and terminal states, ensuring both precision and real-time performance without linear simplification of the model. The direct mapping relationships between the geometric trajectory and control space, and between the geometric trajectory and flight state, were thus established. Difficult problems, such as the geometric trajectory design and flight state prediction in the trajectory planning process, were thereby resolved, thus accomplishing rapid adaptive planning of the glide trajectory. The effectiveness of this method was verified by simulation examples.