Abstract
This paper proposed a disturbance rejection control method based on linear quadratic (LQ) for nonminimum-phase discrete-time systems with unmatched signals. By introducing a new cost function that considers the influences of disturbance on the input signal, we apply the novel control method to hypersonic flight vehicle (HFV) system to solve the problem of turbulence compensation. A two-component control input is generated through systematic derivation of finite-time LQ optimal control law, improving the stability, output regulation capability, and robustness of the HFV system. Comparison analysis under different control schemes in simulation study shows the effectiveness of the proposed method.
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