Method for extracting dimension characteristics of underwater target based on space similarity

An underwater target and feature extraction technology, applied in radio wave measurement systems, instruments, etc., can solve problems such as great influence, complex underwater target shape, and discrete target orientation.

Inactive Publication Date: 2013-09-04
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
View PDF5 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main difficulty of these methods is that the shape of the underwater target is complex, the randomness and time-varying nature of the underwater acoustic environment lead to a large dispersion of the extracted target az...

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
  • Method for extracting dimension characteristics of underwater target based on space similarity
  • Method for extracting dimension characteristics of underwater target based on space similarity
  • Method for extracting dimension characteristics of underwater target based on space similarity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0069] Below in conjunction with the accompanying drawings, the method for extracting underwater target scale characteristics based on spatial similarity proposed by the present invention will be described in detail:

[0070] like figure 1 As shown, the underwater distribution source-target environment. Suppose the distance R between the underwater target and the sonar; seawater sound velocity c=1450m / s; sonar speed v=30kn, that is, v=30×1852 / 3600m / s; the heading of the target is 0°; the carrier frequency f c =15kHz; sampling frequency f s =50kHz; the transmit signal is a single-frequency rectangular wave with a pulse width of 32ms.

[0071] like figure 2 As shown, the receiving hydrophone array structure diagram. Assume that the base array is an equally spaced linear array with M=16 array elements, and the array element spacing d is half a wavelength. The echo signal incident angle is

[0072] like image 3 As shown, a flow chart of a method for extracting scale cha...

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 provides a method for extracting the dimension characteristics of an underwater target based on space similarity. The method comprises the following steps of calculating the conventional beamforming space power spectrum of a distribution source based on ripple signals of the underwater target, utilizing point target space power spectra obtained by a space similarity theory and a classic theory to perform space similarity measurement, and finishing classification and recognition according to previously established space measurement threshold standards so as to extract the dimension characteristics of the underwater target. The method for extracting the dimension characteristics has the advantages that the influence of irradiation angles, base arrays and target distance parameters on the dimension characteristics is considered so as to conform with the visual recognition of the eyes to the dimensional target; three space similarity measurement methods are adopted in the process of extracting the dimension characteristics of the target, the defects of a single method are overcome, and the extracting and recognition reliability of the dimension characteristics of the underwater target is improved; and the conventional beamforming (CBF) method is used for calculating the space power spectrum of the distribution source target, and the space similarity calculation methods are relatively simpler and favorable to engineering realization.

Description

technical field [0001] The invention belongs to the technical field of underwater acoustic signal processing, in particular to a method for extracting underwater target scale characteristics based on spatial similarity. Background technique [0002] The usual azimuth estimation theory often assumes that the target is a point target, even if there are multiple targets, they are also assumed to be independent reflection points. However, in the actual environment, the target has a certain shape and volume, and each target, especially some large targets, will occupy a certain space in the orientation instead of a geometric point, that is, a certain spatial distribution in the orientation. We call this kind of goal a distributed goal. In order to estimate the parameters of this kind of target in a detailed structure, the traditional point target model cannot be used to describe it, but a distributed target model must be used to describe it, and the characteristics of specific ta...

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
IPC IPC(8): G01S7/539
Inventor 邵杰王丽赵伟松仲雅琴
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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
PatSnap group products

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