航天器周期时变模态参数闭环在轨辨识的子空间方法

A Subspace Method of Periodically Time-Varying Modal Parameters Identfication for Spacecraft Based on Closed-Loop on-Orbit Data

考虑在轨闭环航天器的参数辨识,利用子空间方法辨识大型闭环航天器的周期时变模态参数和控制器的增益参数.讨论了反馈控制器增益矩阵在状态空间方程中的坐标变换情况.利用该方法对所建立的ETS-Ⅷ卫星模型的模态参数和控制器增益参数进行辨识,通过验证闭环系统的响应值,说明该方法在航天器的模态参数闭环辨识中是有效的.

Considering parameter identification of on-orbit closed-loop spacecraft, the periodically time- varying modal parameters and controller gain parameters of a large closed-loop spacecraft are identified u- tilizing subspace method. The coordinate transformations of controller gain matrix in the state space equa- tion are discussed. This approach is used to indentify modal parameters and controller gain matrix of the established ETS-Vm model. The results show that the proposed algorithm is effective in the closed-loop i- dentification of modal parameters via verifying closed-loop response results in the simulation.