仅利用输出信号的挠性航天器模态参数子空间在轨辨识算法

Modal Parameter Identification for Flexible Spacecraft Using Output-only Subspace Algorithm

为了在轨获得精确的挠性航天器模态参数,在子空间辨识算法的基础上,给出了一种仅利用输出信号的挠性航天器模态参数在轨辨识算法。其特点是输入信号不必是白噪声,且当输入信号不易测量时,只利用被噪声污染的输出信号就能进行模态参数的在轨辨识。通过对哈勃太空望远镜(HST)和MiniMast 空间挠性结构两个算例的仿真,验证了算法的有效性和实用性。

In order to acquire accurate modal parameters for flexible spacecraft, an on-orbit identification method based on output-only subspace algorithms is presented. Its feature is that even if the input signals are nonwhite noise and hard to measure, the modal parameters of the flexible spacecraft can still be identified only making use of the noise-corrupted output signals. Two numerical examples taken from Hubble Space Telescope ( HST) and Mini-Mast flexible space structure are used to demonstrate the validity and practicability of the proposed method.