Method for analyzing harmful stray current period based on continuous wavelet cross-correlation

The invention belongs to the technical field of stray current period detection and analysis, and relates to a method for analyzing a harmful stray current period based on continuous wavelet cross-correlation. The method is based on continuous wavelet transformation of two time-varying signals of pipeline-soil potential and pipeline-track voltage, direct-current dynamic stray current is analyzed in a wavelet space, data are compared, and common spectrum power of the measured data is displayed on a single graph. From a continuous wavelet cross-correlation spectrogram, time intervals containing significant cross-correlation and cross-correlation lengths within the time intervals are accurately determined. By performing independent continuous wavelet cross-correlation analysis on the positive signal part and the negative signal part, harmful components of stray current on the underground pipeline and effectiveness of protective measures can be extracted; by comparing the cross correlation between the pipeline-soi