Mixed noise reduction method for underwater acoustic signals

An underwater acoustic signal and noise reduction technology, applied in radio wave measurement systems, instruments, etc., can solve problems such as the direct removal of useful information, achieve good geometric structure regularity, and eliminate noise effects.

Inactive Publication Date: 2018-08-10
XIAN UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0003] The purpose of the present invention is to provide a hybrid noise reduction method for underwater acoustic signals, which solves the problem that the existing underwater acoustic noise reduction methods have the defect that useful information will be directly removed when removing noise

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  • Mixed noise reduction method for underwater acoustic signals
  • Mixed noise reduction method for underwater acoustic signals
  • Mixed noise reduction method for underwater acoustic signals

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[0031] The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0033] Such as figure 1 As shown, the present invention discloses a hybrid noise reduction method for underwater acoustic signals, comprising the following steps:

[0034] Step 1. EMD decomposes the original noisy underwater acoustic signal into a series of intrinsic mode functions, counts the number of the series of intrinsic mode functions, and sets it as the decomposition number of VMD, performs VMD on the noisy underwater acoustic signal Decomposed into a series of variational modal components u k ;

[0035] Step 2, calculate each variational modal component u decomposed by VMD k and the correlation coefficient ρ of the original noisy underwa...

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Abstract

The invention discloses a mixed noise reduction method for underwater acoustic signals. VMD decomposition is conducted on the underwater acoustic signals containing noises, wherein the VMD decomposition quantity is determined by an EMD decomposition result; a correlation coefficient between each variation modal function decomposed by VMD and the original signal is calculated, and according to a threshold value of the correlation coefficient, noise variation modal functions are screened; summation is carried out on all the noise variation modal functions, and SVD differential spectrum noise reduction is carried out; signals are reconstructed, Savitzky-Golay filter is carried out, and the underwater acoustic signals after the noise reduction are obtained; correlation dimension and noise intensity of the underwater acoustic signals before and after the noise reduction are calculated, and timing sequence waveforms and two-dimensional phase diagrams before and after the noise reduction aregiven; The method can further eliminate noises, the phase diagrams of the underwater acoustic signals after the noise reduction have a more smooth rail, and attractors have a better regularity of geometric structures.

Description

technical field [0001] The invention relates to the technical field of underwater acoustic signal processing, in particular to a hybrid noise reduction method for underwater acoustic signals. Background technique [0002] The document "Research on ship-radiated noise denoising using secondaryvariational mode decomposition and correlation coefficient, Sensors, 2018, 18(1): 48(1-17)" discloses an underwater acoustic signal based on variational mode decomposition and correlation coefficient In the noise reduction method, the original underwater acoustic signal is first subjected to variational mode decomposition (Variational Mode Decomposition, VMD), and then the correlation coefficient is used to obtain each variational mode component u k According to the degree of correlation with the original underwater acoustic signal, the variational modal components with a correlation coefficient less than 0.2 are marked as noise components and eliminated, and finally the signal is recons...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/539
CPCG01S7/539
Inventor 李国辉杨智超杨宏张翔宇关倩如郑蒙涛
Owner XIAN UNIV OF POSTS & TELECOMM
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