光学精密工程2025，Vol.33Issue(17)：2810-2820,11.DOI:10.37188/OPE.20253317.2810
基于自适应窗长STFT的空间目标振动特性反演
Inversion of vibration characteristics of space target based on adaptive window length STFT
摘要
Abstract
Time-series photometric signals from spaceborne targets contain rich information about their op-erational states.Conventional short-time Fourier transform(STFT)uses a fixed window length,which limits time-frequency resolution and reduces effectiveness for target classification and identification.To ad-dress this limitation,an eigenfrequency inversion method based on an adaptive-window-length STFT is proposed.A hybrid loss function—combining minimum information entropy,peak energy contrast,and background noise level—is formulated to drive a dynamic window-length adjustment strategy,enabling adaptive matching between window parameters and signal nonstationarity.A dedicated simulation appara-tus was developed to acquire time-series photometric signals that reflect space-target operational character-istics.By varying the momentum-wheel rotational states,scenarios of on-orbit steady operation and atti-tude adjustment were simulated,producing high-rate photometric signals induced by surface vibration.Ex-perimental results show that the proposed algorithm achieves high frequency resolution,with eigenfrequen-cy inversion precision of 0.4 Hz,and dynamically adjusts window length to provide multi-scale temporal resolution.The steady-state eigenfrequency of momentum wheels was estimated with error below 0.3 Hz,and transition points associated with changes in operational conditions were accurately identified.The method offers substantial value for assessing space-target operational state,monitoring health status,and providing early fault warnings for attitude-control systems.关键词
空间目标/时序光度/自适应窗长/短时傅里叶变换/频率特性反演Key words
space targets/temporal luminosity/adaptive window length/short-time Fourier Transorm/inversion of frequency characteristics分类
物理学引用本文复制引用
余凯,黄浦,李宇喆,董昊卿,张绪国..基于自适应窗长STFT的空间目标振动特性反演[J].光学精密工程,2025,33(17):2810-2820,11.基金项目
国家自然科学基金资助项目(No.U21A20451) （No.U21A20451）
