Abstract:

An analytical method of trajectory parameter estimation is proposed for the boost-glide trajectory of hypersonic long-range missile. From the view of energy, an analytical estimation formula of gliding range and flight time is established by using the quasi-equilibrium gliding conditions. Then the effectiveness of glide trajectory parameters such as lift-drag ratio and initial velocity on range and time is studied. Moreover, the range and flight time characteristics of minimum energy elliptical trajectory are analyzed theoretically. Based on the analytical formula, the range and time characteristics of the glide trajectory and the elliptical trajectory under various conditions are compared. Also a criterion on determining the best application scope of the two trajectories is proposed. Finally, the simulation results show that the errors between the analytical estimation results and the numerical simulation results are less than 2%, indicating that the precision of the analytical estimation approach is high. As a result, the performances of glide trajectory may be analyzed reliably and effectively by use of the analytical method, and the analysis results may be provided for the preliminary selection of the trajectory scheme.

Key words: Hypersonic long-range missiles, Minimal energy trajectory, Boost-glide trajectory, Parameter estimation, Glide range, Flight time