An adaptive frequency disturbance rejection control for an inertial reference unit under unknown disturbance

摘要

The inertial reference unit (IRU) can provide a reference beam for the line-of-sight stabilizationsystem to achieve precise pointing and tracking. The reference beam leaves the IRU withminimal jitter and determines the accuracy of acquiring, tracking and pointing system. Whenthe vehicle is moving, the disturbance usually gathers around one frequency. Meanwhile,the resonance introduced by the flexure support of the IRU seriously affects the stabilizationaccuracy. In this paper, an extended state observer with frequency adaptation is proposed toimprove the performance of disturbance rejection. An auxiliary filter is used to optimize thedisturbance frequency estimation and improve the control bandwidth. Simulation results andexperimental data verify the effectiveness of the proposed method.