Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Underwater sound source position and power spectrum joint estimation method based on Sparse Spectral Fitting

A sound source position and joint estimation technology, applied in positioning, measuring devices, vibration measurement in fluids, etc., can solve problems such as unknown position, failure of radiation noise measurement method, performance degradation of radiation noise measurement method, etc., to avoid false peaks interference effect

Inactive Publication Date: 2019-08-02
NORTHWESTERN POLYTECHNICAL UNIV
View PDF3 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the above-mentioned ship radiated noise measurement methods usually need to pre-determine the position or orientation of the target in order to accurately estimate the ship radiated noise
In the actual measurement of radiated noise, the underwater sound source and the receiving array deployed underwater are affected by factors such as water flow and positioning accuracy. It is usually difficult to measure the relative position of the sound source and the receiving array accurately, which will lead to performance degradation
For non-cooperative targets, their positions are completely unknown, and existing methods of measuring radiated noise may even fail

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 more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Underwater sound source position and power spectrum joint estimation method based on Sparse Spectral Fitting
  • Underwater sound source position and power spectrum joint estimation method based on Sparse Spectral Fitting
  • Underwater sound source position and power spectrum joint estimation method based on Sparse Spectral Fitting

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment

[0090] Numerical simulation is carried out by computer to verify the effect of the method for estimating the position of the sound source and the power spectral density of radiation noise proposed in the present invention.

[0091] 1) Set the matrix parameters and simulation environment and obtain the received signal:

[0092] The vertical array adopts uniform linear array with M=11 elements, the distance between array elements is 1 meter, and the corresponding center frequency is about 750Hz. Environmental parameters such as Figure 4 shown. The target is located at (r=100m, d=50m), and the PSD of its radiation noise at 750Hz is set to 130dB. The duration of receiving signals in the time domain is 0.5 seconds, and the sampling frequency is 10 kHz, then the number of snapshots of the time domain signals is N=5000, and the received signals are transformed into the frequency domain by Fourier transform. The environmental noise is set to Gaussian white noise, and its PSD is se...

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

No PUM Login to View More

Abstract

The invention relates to an underwater sound source position and power spectrum joint estimation method based on Sparse Spectral Fitting, and provides an underwater sound source position and Power Spectral Density (PSD) joint estimation method based on Sparse Spectral Fitting (SpSF) aiming at a vertical linear array consisting of isotropic acoustic hydrophone. According to the method, the sparsityof the position of a sound source in a test water area is utilized, the test water area is meshed, a sparse signal recovery model is established, the relation between a sampling covariance matrix andthe PSD of radiation noise is deduced, and finally the position of the sound source and the PSD of the radiation noise are estimated simultaneously by utilizing a SpSF method.

Description

technical field [0001] The invention belongs to ship radiated noise measurement and relates to a joint estimation method of underwater sound source position and power spectrum based on sparse spectrum fitting. Background technique [0002] Once a vessel is built, its radiated noise levels need to be measured to assess its performance. Now commonly used ship noise measurement systems are based on single hydrophones, which are usually carried out in waters with extremely low environmental noise. Only when the ship radiated noise level is much higher than the environmental noise, the SNR of the hydrophone received signal When it is very high, the radiated noise level of the ship can be measured within the allowable range of error. With the development of shock absorption and noise reduction technology, the radiated noise of ships is getting lower and lower, and the environmental noise in the ocean is increasing year by year due to the development of new waterways and the incre...

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
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01H3/10G01S5/20
CPCG01H3/10G01S5/20
Inventor 孙超蒋国庆刘雄厚蒋光禹
Owner NORTHWESTERN POLYTECHNICAL UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com