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

Precession target two-dimensional imaging method based on equivalent scattering points

An equivalent scattering, two-dimensional imaging technology, applied in the field of communications, can solve problems such as inability to accurately image the target

Active Publication Date: 2014-06-18
XIDIAN UNIV
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method overcomes the inability of the coherent single-range Doppler interferometry to accurately image the target when there is an error in the target parameter estimation, and uses the characteristic that the coherent integral value of the time-frequency spectrum is related to the matching degree of the model. The frequency loop iterative method is used to reconstruct the time-frequency spectrum of the precession cone target based on the equivalent scattering point model under different parameter values. Based on the maximum average intensity of the image, the precise value of the parameter is obtained by searching and finally using Coherent single-range Doppler interferometry to obtain two-dimensional images of cone targets

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
  • Precession target two-dimensional imaging method based on equivalent scattering points
  • Precession target two-dimensional imaging method based on equivalent scattering points
  • Precession target two-dimensional imaging method based on equivalent scattering points

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0036] Attached below figure 1 , to further describe in detail the specific embodiments of the present invention.

[0037] Step 1, the radar receives the echo

[0038] The radar emits a chirp signal, the signal form is as follows:

[0039] s ( t ^ , t m ) = rect ( t ^ T p ) · exp ( jπγ t ^ 2 ) · exp ( j 2 π f 0 t )

[0040] in, Represents a chirp signal with distance as the row...

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 precession target two-dimensional imaging method based on equivalent scattering points, which comprises the following steps of: (1) receiving echo by radar; (2) performing speed compensation; (3) performing time frequency analysis; (4) updating speed; (5) updating coning frequency; (6) judging whether the optimal offset is equal to an initial value; (7) performing two-dimensional imaging; and (8) outputting an imaging result. The time frequency spectrum of the coning target with different parameters is integrated and reconstructed with a speed and coning frequency cyclic iteration method through the echo pulse pressure process, the speed compensation and the micro-motion parameter estimation, the accurate value of the parameter is searched and obtained by taking the average intensity maximum of the image as a criterion, and finally, the two-dimensional image of the target is obtained with a coherent single distance Doppler interferometry. The method has the advantages of realizable two-dimensional imaging of the space precession coning target and accurate estimation on the target size and motion parameters.

Description

technical field [0001] The invention belongs to the technical field of communication, and further relates to a two-dimensional imaging method for a precessing target based on equivalent scattering points in the technical field of radar signal processing. The invention can effectively perform two-dimensional imaging on the space precession cone target, estimate the size and motion parameters of the target, and provide a strong guarantee for subsequent target recognition. Background technique [0002] When the smooth-surfaced cone target flies in space at high speed, in order to maintain the stability of attitude, it needs to do spin motion. When it is disturbed by the lateral direction, the spin will be converted into the form of precession. Because the Doppler modulation produced by the precessing target on the echo signal is time-variant, the traditional inverse synthetic aperture radar imaging method based on the turntable model is no longer applicable to the precessing 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
Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/89
Inventor 杜兰杨磊刘宏伟高铭江纠博
Owner XIDIAN 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