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

Underwater motion array multi-target detection and position estimation integrated method

An azimuth estimation and multi-target technology, applied in the direction of measuring devices, radio wave measurement systems, sound wave reradiation, etc., can solve the problems of inability to give azimuth estimation at the same time, poor performance, etc.

Inactive Publication Date: 2015-02-04
HENAN UNIV OF SCI & TECH
View PDF3 Cites 19 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an integrated method for underwater motion array multi-target detection and azimuth estimation to solve the problem of poor performance of traditional detection methods under low signal-to-noise ratio and inability to give azimuth estimation at the same time

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 motion array multi-target detection and position estimation integrated method
  • Underwater motion array multi-target detection and position estimation integrated method
  • Underwater motion array multi-target detection and position estimation integrated method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0033] 1. Motion array signal model

[0034] Consider M array elements, a uniform linear array with a spacing of d, and the array moves in a straight line at a speed v along the x-axis of the reference coordinate. The K frequencies located in the far field of the receiving array are f 0 The narrowband signal source s k (t) respectively by θ k The incident angle reaches each element of the receiving array. During the entire measurement time T, the sampling frequency is f s , the sampling time interval is Δt and t i =i*△t(i=1,2,...,N, N is the total number of sampling points). At this time at t i The received data of the nth (n=1,2,...,M) array element at any time can be expressed as

[0035] x n ( t i ) = Σ k = 1 K A k ...

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 motion array multi-target detection and position estimation integrated method which is characterized by according to a motion array signal model, obtaining a twice-continuous-measurement reception data formula and obtaining phase correction factors; carrying out matrix-form block partitioning on the motion array signal model; by utilizing the synthetic aperture technique and utilizing the phase correction factors, extending a physical array into a virtual array and reconstituting the block matrixes into data matrixes to form MVDR spatial spectrum, and obtaining a detection threshold value through on-site noise study; and obtaining spectrum peak number above the detection threshold value which is regarded as the target number, and the angle corresponding to the spectrum peak is the azimuth angle of an incidence target. The method fully utilizes the underwater motion array synthetic aperture technique to improve array gain and angular resolution, and utilizes an MVDR spatial spectrum function for reflecting signal energy to determine the number of the targets and method; and compared with coherent signals, the detection performance of the method under low signal to noise ratio is obviously superior to that of the conventional method, detection threshold is reduced, farther detection distance is achieved, and position estimation value can be given.

Description

technical field [0001] The invention belongs to the technical field of underwater array signal processing, and relates to an integrated method for underwater motion array multi-target detection and orientation estimation. Background technique [0002] Long-range detection and position estimation of underwater multi-targets are two key issues in underwater array signal processing. The traditional method is to deal with these two aspects separately, first to detect the number of targets through a certain detection method, and then use a certain orientation estimation method to determine the orientation of each target. In this way, the quality of the previous target detection results directly affects the performance of the subsequent target orientation estimation. [0003] In the field of array signal processing, determining the number of signal sources from limited observation data is a prerequisite for many high-resolution azimuth estimation methods. The classic methods for...

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): G01S7/539
CPCG01S7/536G01S7/539G01S15/003
Inventor 侯云山翟红村陈建华徐向艺李佩佩汤艳红翟普杰
Owner HENAN UNIV OF SCI & TECH
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