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为了得到地震信号某段频谱的精细结构,提高其频率分辨率,提出了频率细化技术。通过对地震信号进行复调制移频、数字低通滤波、重新采样、复FFT处理、频率调整实现对地震信号的复调制频率细化。利用Matlab对实际地震信号进行分析,得到地震信号能量最大处的频率,实现了准确、快速地对地震信号某一窄带频谱的分析和研究。与FFT相比,复调制细化得到的地震信号幅度最大处的频率更接近真实值,使地震信号的频谱更精确。
In order to obtain the fine structure of a certain frequency spectrum of a seismic signal and improve its frequency resolution, a frequency refinement technique is proposed. The frequency of complex modulation of seismic signal can be refined through complex modulation frequency shift, digital low-pass filtering, resampling, complex FFT processing and frequency adjustment. Using Matlab to analyze the actual seismic signal, the maximum frequency of the seismic signal can be obtained, and a narrowband spectrum of the seismic signal can be analyzed accurately and quickly. Compared with the FFT, the frequency of the maximum seismic signal amplitude obtained by the complex modulation is closer to the true value and the spectrum of the seismic signal is more accurate.