Underwater acoustic signal Gaussian/non-Gaussian noise suppression method based on blind source separation

A non-Gaussian noise and underwater acoustic signal technology, which is applied in the field of Gaussian/non-Gaussian noise suppression of underwater acoustic signals based on blind source separation, which can solve the problems of high algorithm complexity, incomplete denoising, and uncertainty of target signal sequence.

Active Publication Date: 2020-12-25
QINGDAO UNIV OF SCI & TECH
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Problems solved by technology

[0004] Overall, the current underwater acoustic signal denoising methods still have problems such as in...

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  • Underwater acoustic signal Gaussian/non-Gaussian noise suppression method based on blind source separation
  • Underwater acoustic signal Gaussian/non-Gaussian noise suppression method based on blind source separation
  • Underwater acoustic signal Gaussian/non-Gaussian noise suppression method based on blind source separation

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Embodiment 1

[0088] When sound waves are transmitted underwater, the sending signal is affected by noise, and the quality of underwater acoustic communication is reduced. The complexity and randomness of the noise increase the difficulty of denoising the received signal. For complex noise, the noise is classified and removed according to the characteristics of the noise, which can ensure the effectiveness of noise removal and obtain accurate target signals. The specific model is as follows: figure 1 shown.

[0089] The signal blind source separation technology based on the optimization algorithm has better signal separation performance. Its main steps are: firstly, the optimization algorithm is used to obtain a separation matrix, and the separation matrix is ​​multiplied by the received signal to obtain the separation signal. However, the underwater noise is complex, and the current underwater acoustic signal denoising methods have problems such as incomplete denoising, high algorithm comp...

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Abstract

The invention discloses an underwater acoustic signal Gaussian/non-Gaussian noise suppression method based on blind source separation. The method is used for underwater acoustic communication signal denoising. Firstly, Gaussian noise is removed in advance by adopting a sparse coding theory based on underwater acoustic signal sparse characteristics, including constructing a sparse penalty functionbased on a Laplace distribution model and solving a sparse component under the condition of maximum likelihood estimation; and then based on the non-Gaussian characteristic of the underwater acousticsignal, the non-Gaussian random noise is regarded as a source signal, and based on an improved grey wolf optimization algorithm, solving the blind source separation problem of the underwater acousticsignal; and finally, a target signal is extracted based on the correlation coefficient matrix between the separated signal and the received signal, and non-Gaussian noise is removed. According to themethod, Gaussian and non-Gaussian noise in a complex underwater acoustic environment can be effectively suppressed, and the underwater acoustic signal receiving quality is improved.

Description

technical field [0001] The invention belongs to the field of underwater acoustic signal denoising, and in particular relates to a Gaussian / non-Gaussian noise suppression method for underwater acoustic signals based on blind source separation. Background technique [0002] Underwater wireless data transmission technology is the key technology for building a maritime power. Acoustic waves are currently the only information carrier that can travel long distances underwater, and are widely used in the field of underwater communications. However, when sound waves are transmitted underwater, they are affected by a large amount of complex background noise. The sources of underwater acoustic noise can be divided into two types. The first is caused by human activities, such as ship shipping, industrial activities and other machine sounds, and the second is caused by natural factors, such as rain, marine life and seismic activities. noise. [0003] A new method of underwater acoust...

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Application Information

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IPC IPC(8): G10L21/0208G10L21/0264G10L21/0272G10L21/0308G06N3/00
CPCG06N3/006G10L21/0208G10L21/0264G10L21/0272G10L21/0308
Inventor 王景景李爽李嘉恒张威龙杨星海施威刘岩
Owner QINGDAO UNIV OF SCI & TECH
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