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

A target azimuth imaging method based on superposition vortex light

An imaging method and target orientation technology, which is applied in the re-radiation of electromagnetic waves, instruments, measuring devices, etc., can solve the problems of translation and rotation, unrealizable, and inability to detect beam rotation, etc., and achieve high-resolution effects

Active Publication Date: 2022-04-19
PLA PEOPLES LIBERATION ARMY OF CHINA STRATEGIC SUPPORT FORCE AEROSPACE ENG UNIV
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the synthetic aperture cannot realize both translation and rotation, and cannot detect the rotation of the beam in the vertical direction.

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
  • A target azimuth imaging method based on superposition vortex light
  • A target azimuth imaging method based on superposition vortex light
  • A target azimuth imaging method based on superposition vortex light

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0062] In the present invention, the vortex light in the rotating superposition state is used as the detection information carrier, and the target imaging flow chart is as follows figure 2 As shown, the specific implementation steps are as follows:

[0063] (1) Generation of rotating superposition vortex light with high-order angular momentum

[0064] For a typical vortex Laguerre-Gaussian beam, the phase of the light field is uncertain at the center of the propagation direction, but the amplitude is 0, and the center point is also called a phase singularity. The light field expression is:

[0065]

[0066] like image 3 As shown, the topological charge generated by the antenna transmitting device is l, and the frequency and phase are respectively f 1 , The left-handed vortex light at the same time produces a topological charge of -l, a frequency and a phase of f 2 , The right-handed vortex light, left-handed vortex light and right-handed vortex light are superimpos...

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 a target azimuth imaging method based on superposition vortex light. Based on the rotation modulation, the rotating superposition state vortex light with different time-varying phase differences is generated to irradiate the target, and the rotating Doppler effect is generated. The target echo signal is Fourier transformed to obtain the time-frequency signal. Using the rotating Doppler frequency shift signal and The space-time inversion relationship of the intensity helix spectrum is used to obtain the intensity helix spectrum of the vortex light in the rotating superposition state. At the same time, the time spectrum analysis is performed on the echo signals of the vortex light in the rotating superposition state with different time-varying phase differences, and the phase of the vortex light in the rotating superposition state is obtained. Helix spectrum; finally, through the superposition of the intensity helix spectrum and the phase helix spectrum of the rotation superposition vortex light, the azimuth imaging of the target is realized through reconstruction. The method of the invention has higher imaging resolution under the forward-looking / staring imaging condition, and realizes imaging "not dependent on motion, benefiting from motion".

Description

technical field [0001] The present invention mainly relates to the fields of optics, physics, photoelectric conversion, signal detection and optical imaging, especially technical methods such as phase and frequency modulation and demodulation. Background technique [0002] Synthetic Aperture Laser Radar (SAL) moves the traditional synthetic aperture technology from the microwave band to the laser band. Through the combination of synthetic aperture technology and laser characteristics, SAL can achieve better resolution by using the characteristics of short wavelength of laser, so SAL will play an important role in the field of ultra-high resolution imaging and recognition. [0003] Similar to the SAR system, when the SAL system is imaging, the radar platform moves along the azimuth direction at a speed V, and continuously sends signals to the surveying strip and receives the echoes of the target during the movement. If P1 and P2 are the positions of the radar platform at two...

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): G01S17/90
Inventor 任元陈琳琳刘通陈晓岑沙启蒙王琛王丽芬
Owner PLA PEOPLES LIBERATION ARMY OF CHINA STRATEGIC SUPPORT FORCE AEROSPACE ENG 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