Coal bed hydrofracture micro-earthquake signal combined noise reduction method based on wavelet packet multithreshold and improved experience mode decomposition
A technology of empirical mode decomposition and wavelet packet decomposition, applied in seismic signal processing, seismology, measurement devices, etc., can solve problems such as difficulty in taking into account high resolution and adaptability, and achieve good denoising effect and strong applicability Effect
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[0062] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention.
[0063] The combined noise reduction method for coal seam hydraulic fracturing microseismic signals based on wavelet packet multiple thresholds and improved empirical mode decomposition provided by the present invention comprises the following steps:
[0064] Step 1: Import the coal seam hydraulic fracturing microseismic signal S(n) collected on site
[0065] Import and collect the mine coal seam hydraulic fracturing microseismic signal time series S(n), n=1, 2, ..., N, wherein N is the total number of sampling points of the coal seam hydraulic fracturing microseismic signal, and its sampling frequency is 1000Hz;
[0066] Step 2: Signal preprocessing, including signal triggering and interception, etc.;
[0067] The trigger algorithm of the signal is the improved time window en...
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