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窗函数的衰减系数和采样间隔究竟对地球物理信号时频分辨率造成多大的影响,如何才能更好地消除这种影响,是该文的主要出发点。提高分辨率是信号时频分析处理的关键,在地球物理数据处理和属性参数提取等方面具有重要作用和广泛应用。该文研究了Gabor变换窗函数衰减系数选择正确与否和采样间隔对信号分辨率的影响。参数选择不当,不仅降低信号时频谱的分辨率,甚至要丢失信号。在用Gabor变换作时频分析时,通过模拟计算预先给出最佳窗函数和最佳参数范围是十分必要的。文中还给出了常规地震信号最佳采样间隔的范围和选择、处理方法。
How the attenuation coefficient and the sampling interval of the window function affect the time-frequency resolution of the geophysical signals are the main starting points for how to eliminate the influence better. Increasing the resolution is the key to signal time-frequency analysis and processing, and plays an important role and widely used in the fields of geophysical data processing and attribute parameter extraction. This paper studies whether the selection of the attenuation coefficient of Gabor transform window is correct or not and the influence of sampling interval on signal resolution. Improper selection of parameters not only reduces the resolution of the spectrum at the time of the signal but also loses the signal. When using Gabor transform for time-frequency analysis, it is necessary to give the optimal window function and the optimal parameter range through simulation. The article also gives the scope and selection of the best sampling interval of conventional seismic signals, processing methods.