广义S变换时频分析在广域电磁法数据处理中的应用

广义S变换是一种可逆的局部时频分析方法,是短时傅里叶变换和小波变换的延伸和推广。利用广义S变换对广域电磁时间序列数据进行分析,除了可以划定噪声区域便于实施滤波去噪之外,还可以提高数据频谱分析精度。针对广域电磁数据特点,基于广义S变换提出了适合广域电磁法的广义S变换处理流程,进行了信号的仿真实验。同时,也对广域电磁法实测数据进行了处理,高信噪比数据的处理结果证实了广义S变换的有效性和准确性。强干扰数据处理的结果表明,获取的信号质量比基于傅里叶变换的传统方法有明显提高。处理效果表明,提出的方法适用于广域电磁法数据处理。

The application of the generalized S-transform in the data processing of the wide-field electromagnetic method

The generalized S transform is a reversible local time-frequency analysis method,which is the extension of the short time fourier transform and the wavelet transform. This method is used to analyze the time series data of wide-field electromagnetic method. On the one hand,the noise area can be found to facilitate the noise filtering process. On the other hand,it can improve the accuracy of data spectrum analysis. Based on the generalized S transform and the wide field electromagnetic data processing method,a generalized S transform processing flow suitable for wide area electromagnetic method is proposed. At the same time,processing the measured data with high signal-to-noise ratio confirms the validity and accuracy of the method. It achieves high quality data for processing the measured data with strong interference. The results show that the method proposed in this paper is suitable for the data processing of the wide field electromagnetic method.