Abstract: An analytical reentry guidance method based on quasi-equilibrium glide is proposed for hypersonic glide vehicles. The analytical relationship among range, energy and bank angle is established based on the quasi-equilibrium glide condition, and the analytical solution of bank angle is obtained. The tra- jectory is smoothed by altitude rate feedback. For terminal altitude constraint, the analytical relationship among range, terminal altitude and flight path angle is established, and the solution of flight path angle is given based on the hypothesis of constant flight path angle deriving from quasi-equilibrium glide condition. Then the angle of attack command is obtained by designing feedback control law for flight path angle. For path constraints, an online constraint control method based on flight path angle command is proposed. The heading angle corridor is used to determine the sign of bank angle in lateral guidance. Simulated results show that the proposed algorithm is efficient in calculation with good accuracy and strong robustness. Key

Key words: hypersonicflightvehicle, reentryguidance, analyticalsolution, quasi-equilibriumglidecondition