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

Coherent signal direction finding method and system with unknown signal source number

A coherent signal and source number technology, applied in the field of signal processing, can solve the problem of inaccurate noise covariance matrix

Inactive Publication Date: 2015-01-21
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
View PDF6 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in reality, the noise covariance matrix calculated by limited observations is not accurate

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
  • Coherent signal direction finding method and system with unknown signal source number
  • Coherent signal direction finding method and system with unknown signal source number
  • Coherent signal direction finding method and system with unknown signal source number

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0083] The invention discloses a coherent signal direction finding method with unknown number of sources, which comprises the following steps:

[0084] Consider a uniform linear array (ULA) with (2M+1) elements. Suppose there are P(P≤M+1) far-field narrowband signals from different directions {θ 1 ,…,θ P} incident on the array, the first K signals are mutually coherent, and the remaining (P-K) signals are mutually uncorrelated and independent of the first K signals. Let the first signal d 1 (t) as a reference signal, then the kth coherent signal can be expressed as

[0085] s k ( t ) = β k e jδ φ k s 1 ( t ) , k = 2 , ...

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 coherent signal direction finding method and system with an unknown signal source number. The coherent signal direction finding method includes the initiating step, the fourth-order cumulant matrix calculating step, the Toeplitz matrix establishing step, the intermediate variable setting step, the power spectrum calculating step and the searching step. The method and system have the advantages that decorrelation is conducted on coherent signals by establishing the Toeplitz matrix based on fourth-order cumulant, the Toeplitz matrix is of a joint diagonalization structure, and therefore no priori knowledge about the signal source number is needed; a new cost function is designed, and therefore the direction of arrival can be effectively estimated.

Description

technical field [0001] The invention relates to the field of signal processing, in particular to a method and system for direction finding of coherent signals with unknown number of signal sources. Background technique [0002] Direction finding using spatially distributed sensor arrays is an important task in applications such as radar, sonar, and wireless communication. At present, many DOA estimation algorithms have been proposed. Among them, subspace-based algorithms, such as ESPRIT and MUSIC algorithms, provide a good solution for estimating DOA under the assumption that the conditions are met. The assumption is that the number of sources is known, the sources are uncorrelated or partially correlated and the noise is spatially uncorrelated white noise, that is, the covariance matrix is ​​proportional to the identity matrix. When any one of the assumptions is not true, the performance of the subspace-based algorithm will be severely degraded. [0003] In actual situati...

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): G06F19/00G01S3/00
Inventor 黄磊钱诚蒋双杨云川
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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