Abstract: For the highprecision autonomous guidance of hypersonic vehicles with the non nominal reentry mission, a fully autonomous adaptive guidance method based on online trajectory planning and tracking law online calculating is studied. The reference trajectory with the multipath constraints is generated online via the quasi balanced glide condition and a higher precision planning model. And the feedback gain matrix of the linear quadratic regulator is online calculated when tracking the reference trajectory, obtaining a high precision adaptive tracking law. Finally, Monte Carlo simulation is presented to validate the high accuracy and robustness of the proposed algorithm, with the longrange and shortrange reentry missions.

Key words: hypersonic vehicle;online trajectory planning, quasi equilibrium glide condition, linear quadratic regulator, symbolic function method