Parameter Identification and Improvement in Empirical Model of Flywheel Disturbance

It is a basic and key technology for high stability and high resolution optical satellite to identify the parameter of flywheel disturbance model accurately. There are two main disturbance models of the flywheel, i.e., empirical model and analytical model. The parameters that need to be identified in empirical model are harmonic numbers and amplitude coefficients. The effects of truncation of the time domain are neglected in traditional parameter identification method when calculating the amplitude coefficients, while the errors of the coefficients are not small sometimes, which can lead to uncertainty to the high frequency jitter response analyses. In order to improve the accuracy and reliability of the disturbance model, this paper presents windowing method and related recovery technique in frequency domain. From the result of simulation, it can be seen that this method improves the accuracy of the parameter significantly.