Broadband submarine sound signal processing method of wavelet trans-dimension correlation filtering
A technology of correlation filtering and underwater acoustic signal, which is applied in the direction of instruments, character and pattern recognition, computer components, etc., can solve the problems of ship radiation noise interference, noise interference, etc., and achieve the effect of avoiding sampling loss and improving data processing accuracy
Inactive Publication Date: 2018-07-13
THIRD INST OF OCEANOGRAPHY STATE OCEANIC ADMINISTATION
View PDF1 Cites 3 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, when monitoring and processing broadband and pulsed underwater acoustic signals such as single-channel seismic and multi-channel seismic, it is faced with the interference of ba
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0029] The implementation process of the present invention will be further described below in conjunction with specific formula:
[0030] Let the maximum scale of wavelet decomposition be J. Wf(j,n) represents the discrete wavelet transform of the noisy signal f at position n on scale j, and takes the transformed values of adjacent scales for correlation calculation, defined as:
[0031]
[0032] Among them, l represents the number of scales participating in the correlation operation, and j
[0033] Corr 2 (j,n)=Wf(j,n)Wf(j+1,n) (2)
[0034] where Corr 2 (j,n) is the correlation coefficient at point n on scale j.
[0035] After performing cross-scale correlation operations, for the case of scale j ≥ 3, formula (2) is expressed as:
[0036] Corr 2 (j,n)=Wf(j,n)Wf(j-k,n) (...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more PUM
Login to view more Abstract
The invention discloses a broadband submarine sound signal processing method of wavelet trans-dimension correlation filtering, and relates to the submarine sound signal processing. The method comprises the following steps: static discrete wavelet transform of a measured signal; translation correction of a wavelet coefficient; wavelet coefficient feature analysis of a signal and an interfering noise; wavelet coefficient correlation analysis in different scales; selection of a filtering threshold value coefficient; and threshold filtering and reconstructing of the wavelet coefficient. The staticdiscrete wavelet transform is used, and the down-sampling is not performed on the wavelet coefficient obtained after the transform, the length of the original signal is not changed, and the samplingloss of the signal features is avoided. An offset problem of the wavelet coefficient after the wavelet decomposition is corrected, and the data processing precision is improved. A problem that a signal feature value cannot be extracted because a correlation coefficient of the neighboring scales can be weaker is solved through the wavelet coefficient trans-dimension correlation filtering. Accordingto the wavelet decomposition coefficient features of a noised-signal, the filtering threshold valve coefficient is self-adaptively selected, and problems that the filtering threshold valve can be oversize or undersize are solved.
Description
technical field [0001] The invention relates to underwater acoustic signal processing, in particular to a broadband underwater acoustic signal processing method using wavelet cross-scale correlation filtering. Background technique [0002] With the development of human civilization, the strategic position of the ocean has become increasingly prominent. Countries actively develop and utilize marine resources and space, and use various means to detect, research and develop the underwater environment of the ocean. Acoustic waves are currently the only form of energy capable of long-distance transmission in the ocean. Therefore, among numerous marine underwater detection and development equipment, acoustic wave detection is the main technical means used. [0003] Due to the wide application of sound waves in ocean exploration and development, the extraction, processing and identification of underwater acoustic signals are very important. Different types of underwater acoustic s...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more Application Information
Patent Timeline
Login to view more IPC IPC(8): G06K9/00
CPCG06F2218/06G06F2218/08
Inventor 文洪涛杨燕明
Owner THIRD INST OF OCEANOGRAPHY STATE OCEANIC ADMINISTATION
Who we serve
- R&D Engineer
- R&D Manager
- IP Professional
Why Eureka
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Social media
Try Eureka
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap