State Estimation for International Space Station Centrifuge Rotor

This paper describes the design of a state estimator to generate absolute centrifuge rotor state information from relative measurements, between the rotor and the International Space Station structure, in the absence of disturba nce input knowledge. A Kalman filter is designed for a plant model augmented with internal disturbance states. The internal disturbance states are used to model unknown thruster firing induced disturbances. This paper first reviews the design issues, then presents the design methodology, and concludes with simulation results which verify the design. Simulation results show that an increase in operational bandwidth can be achieved by expanding the dimensionality of the internal disturbance filter model. In addition, Monte Carlo analysis results indicate robustness against plant and disturbance uncertainty.