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This paper deals with the problem of angle-of-attack modulation with the aimof enhancing transient performance of entry guidance during bank reversals,while compensating adverse effects of fast time-varying transient disturbances.An extended single-input/single-output system is developed in the velocitydomain by means of a dynamic extension technique, and explicitly captures thetrajectory dynamics of angle-of-attack modulation. A normal form for thisextended system is derived for the sake of employing a feedback linearizationcontroller. Further, the control characteristics of angle-of-attack modulationis found to be a non-minimum phase behavior under two common conditions in anear- equilibrium glide flight. Therefore, the issue of angle-of-attackmodulation is formulated as robust output stabilization of the non-minimumphase system. A disturbance observer-based feedback linearization technique isused to design a robustly dynamical output-feedback controller forangle-of-attack modulation, and an internal-state feedback controller forbank-angle modulation is used to stabilize the unstable internal dynamics.Numerical simulations are conducted to demonstrate that the performance of theproposed method of angle-of-attack modulation is enhanced compared to theexisting shuttle method.

Angle-of-Attack Modulation in Trajectory Tracking for a Reusable Launch Vehicle