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时频分析是分析非平稳信号的有效方法,将一维的时域信号和频域信号映射到二维时频平面上,获得信号的时频分布,清晰地描述了信号频率随时间变化的关系。通过模拟信号的广义S变换,分析信号的时频分布特征,并建立正演模型,运用广义S变换提取正演模型的单频剖面。利用基于广义S变换的时频分析方法,提取某工程项目实际地震资料的单频剖面,从而有效识别地质薄层。
Time-frequency analysis is an effective method to analyze non-stationary signals. One-dimensional time-domain signals and frequency-domain signals are mapped to two-dimensional time-frequency planes to obtain the time-frequency distribution of the signals. The relationship between the signal frequency and time is clearly described . Through the generalized S transform of the analog signal, the time-frequency distribution of the signal is analyzed, and the forward model is established. The generalized S transform is used to extract the single frequency profile of the forward model. The time-frequency analysis method based on generalized S transform is used to extract the single frequency profile of the actual seismic data of an engineering project so as to effectively identify the geological thin layers.