Abstract:The new generation missile has the characteristics of large airspace and wide speed range. The drastic change of flight environment and the influence of slenderness ratio on the structural characteristics of the missile result in a wide range of structural modal parameters. The traditional fixed-parameter notch filter is difficult to adapt to this drastic parameter change. An adaptive elastic vibration suppression algorithm is proposed in this paper. Firstly, the frequency spectrum of the output signal of rate gyroscope is analyzed by modulated sliding discrete Fourier transform algorithm, and the frequency and amplitude of each order elastic vibration signal are identified in real-time. Based on the identification results, an on-line tun-ing method of the notch filter is designed to ensure that the notch filter can filter the elastic vibration signal quickly and ac-curately. The simulation results show that the algorithm can identify the elastic vibration signal quickly and effectively, and has the strong adaptive ability for the non-stationary signals with frequency mutation and linear change, and can meet the practical engineering requirements.