Transient electromagnetic data processing method based on wavelet decomposition and IME frequency estimation
A transient electromagnetic and wavelet decomposition technology, applied in computing, complex mathematical operations, computer components, etc., can solve the problems of reducing the number of superpositions, residual power frequency harmonic noise, low efficiency, etc., to eliminate power frequency harmonic noise. Residual, remove residual noise, improve the effect of signal-to-noise ratio
Active Publication Date: 2020-10-13
JILIN UNIV
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[0005] The purpose of the present invention is to solve the residual power frequency harmonic noise, many times of superposition, and low efficiency existing in the noise suppression of the existing transient electromagnetic method. Due to the interference of power frequency harmonic noise, transient electromagnetic data can not even work normally, etc., a transient electromagnetic data processing method based on wavelet decomposition and IME frequency estimation is provided. Under the premise of obtaining accurate power frequency, the method can Setting the transient electromagnetic operating frequency and duty cycle, and then using bipolar square wave emission can effectively suppress power frequency harmonic noise, eliminate noise residues, and greatly reduce the number of superimpositions, which is of great significance for the efficient detection of underground space
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[0041] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In order to avoid obscuring the essence of the present invention, well-known methods, procedures, and flow charts are not described in detail.
[0042] In the description of the present invention, the IME (Improving model estimator) algorithm is an improved modeled frequency estimate.
[0043] A transient electromagnetic data processing method based on wavelet decomposition and IME frequency estimation, the overall workflow is as follows figure 1 shown, including the following steps:
[0044] S1. Collect environmental noise: collect a group of environmental noise with a duration of Ta, where Ta≥60ms, and the environmental n...
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The invention provides a transient electromagnetic data processing method based on wavelet decomposition and IME frequency estimation, which belongs to the field of transient electromagnetic signal processing. A wavelet decomposition algorithm is adopted to preprocess environmental noise so as to suppress random noise and reduce the interference of other noise on power frequency noise frequency estimation, and then an IME frequency estimation method is adopted to accurately estimate the power frequency noise frequency f by taking harmonic noise components in the noise as main components. And finally, a transient electromagnetic working frequency 4 / f, a duty ratio of 25% and bipolar square wave emission are set, and power frequency harmonic noise and residual noise thereof are effectively eliminated by utilizing the periodicity of the power frequency noise.
Description
technical field [0001] The invention relates to the field of transient electromagnetic signal processing, in particular to a transient electromagnetic data processing method based on wavelet decomposition and IME frequency estimation. Background technique [0002] The transient electromagnetic method is a geophysical detection method based on the law of electromagnetic induction. Because of its sensitivity to low-resistance bodies, it is widely used in geological structure detection, geological resource exploration, etc., and it is also widely used in the underground space of human cities. Scientific research and exploration work. [0003] However, in terms of noise suppression, the most effective method of transient electromagnetic method to deal with noise is to perform multiple superposition of data on the basis of transmitting bipolar square waves. This method has achieved excellent noise suppression effect under the premise of having a large amount of data. , but a lar...
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Login to View More IPC IPC(8): G06K9/00G06F17/12G06F17/15
CPCG06F17/12G06F17/15G06F2218/04
Inventor 张洋黄思和张博孙一书林君
Owner JILIN UNIV