The invention discloses a space-frequency characterization method for dynamic geometric irregularity of an orbit. The method comprises the following steps: acquiring dynamic geometric data of a target orbit; performing multi-scale decomposition on the preprocessed track dynamic geometric data to obtain a plurality of single-component signals; performing Hilbert transform on each single-component signal to obtain corresponding instantaneous frequency and instantaneous amplitude; performing linear superposition on the instantaneous frequency and the instantaneous amplitude to obtain an average energy density spectrum of the track irregularity; and based on the track irregularity average energy density spectrum, analyzing track irregularity energy density distribution characteristic information in the space domain, the frequency domain and the space-frequency domain, and obtaining the geometric smoothness state of the target track. Evaluation indexes of the existing track irregularity are fused, the defect and limitation of representing the geometric state of the track from the space and wavelength unilaterally are overcome, the mileage position and wavelength information of the track irregularity can be determined in a space-frequency joint plane, and the space-frequency distribution characteristics of the track irregularity can be counted.
本发明公开了一种轨道动态几何不平顺的空频表征方法,其包括以下步骤:获取目标轨道动态几何数据;将预处理后的轨道动态几何数据进行多尺度分解,得到多个单分量信号;对各个单分量信号进行希尔伯特变换,得到对应的瞬时频率和瞬时幅值;将瞬时频率和瞬时幅值进行线性叠加,得到轨道不平顺平均能量密度谱;基于轨道不平顺平均能量密度谱,分别在空间、频率和空‑频域中分析轨道不平顺能量密度分布特征信息,获取目标轨道的几何平顺状态。本发明融合了既有轨道不平顺的评价指标,解决了分别从空间、波长单方面表征轨道几何状态的缺点和局限性,可在空间‑频率联合平面内确定轨道不平顺的里程位置及波长信息、统计其空频分布特征。
Space-frequency characterization method for dynamic geometric irregularity of track
一种轨道动态几何不平顺的空频表征方法
2024-05-03
Patent
Electronic Resource
Chinese
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