Distributed sub-array wave arrival direction estimation method

A direction estimation and distributed sub-technology, applied to radio wave measurement systems, instruments, etc., can solve the problems of low utilization of array elements, multiple snapshots, and large amount of calculation, so as to reduce the SNR threshold and improve the accuracy of angle measurement , The effect of improving the operation speed

Active Publication Date: 2013-04-03
XIDIAN UNIV
View PDF2 Cites 34 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method provides a higher angle estimation accuracy than the dual-scale ESPRIT method, but it not only requires eigenvalue decomposition, but also requires a one-dimensional angle search for the MUSIC spectrum, which requires a large amount of computation and a large number of snapshots. Subspace fitting cannot be performed when the number of snapshots is small
[000

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
  • Distributed sub-array wave arrival direction estimation method
  • Distributed sub-array wave arrival direction estimation method
  • Distributed sub-array wave arrival direction estimation method

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0035] The content and effects of the present invention will be described in detail below with reference to the accompanying drawings.

[0036] Reference figure 1 , The present invention includes the following steps:

[0037] Step 1: Extract the target signal from the radar echo.

[0038] The rotation invariant sub-array division model of the distributed sub-array in the present invention is as figure 2 Shown. figure 2 The distance between the two baselines is Δ s The sub-arrays are composed of N s Two isotropic array elements, so the total number of array elements is N=2N s , Array element spacing is d≤λ / 2, λ is the signal wavelength, and the sub-array spacing is much larger than the array element spacing.

[0039] Assuming that the narrowband far-field signal is incident on the array at an angle θ, and the center element of the first sub-array is used as the reference point, the steering vector of the reference sub-array to the signal is:

[0040] a sub ( μ ) = ...

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 discloses a staggered base line angle measurement method based on a distributed sub-array. The problem that the angle is fuzzy in the distributed sub-array wave arrival direction estimation process is mainly solved. The method comprises the following implementation processes of: extracting a target signal from a radar echo; performing coarse angle measurement on a target signal by using a digital beam forming method; dividing the sub-array, equally dividing each sub-array into two novel sub-arrays, forming four novel sub-arrays, generating four base lines, and constructing a staggered relationship by two base lines selected from the four base lines; performing beam forming on the four sub-arrays, and calculating a phase difference observation value of the two base lines; calculating a value range of a fuzzy number by utilizing the constructed staggered relationship; and introducing a cost function, solving the fuzzy number by utilizing the minimum mean square error criterion, and solving the cost function value by utilizing the fuzzy number, so as to obtain a target wave arrival angle. The operation amount is reduced by adopting the processing method for constructing the difference of the two base lines, the calculation speed of the target arrival angle estimation is increased, and the method can be used for target identification.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and relates to distributed radar angle measurement, specifically for distributed digital array radar, a multi-resolution angle measurement method based on distributed sub-array is proposed, which can be used for target positioning. Background technique [0002] Direction of Arrival (DOA) estimation is an important research direction in array signal processing, and has been widely used and studied in radar, communication, sonar and navigation and other fields. The DOA estimation performance of the array is limited by the array aperture. The larger the array aperture, the better the DOA estimation performance. Therefore, expanding the aperture is an important method to improve the angle measurement accuracy. The early microwave synthesis interferometric radar can effectively expand the aperture and improve the accuracy of angle estimation, but too small degrees of freedom limit the ...

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): G01S7/41
Inventor 杨明磊陈伯孝王玉陈根华
Owner XIDIAN UNIV
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