Check patentability & draft patents in minutes with Patsnap Eureka AI!

Method for constructing SAR azimuth resolution imaging by rotating FrFT domain

A technology of azimuth resolution and imaging method, which is applied in the field of rotating FrFT domain to construct SAR azimuth resolution imaging, which can solve the problems of low imaging quality and achieve the effects of improving imaging resolution, reducing side lobe level and reducing energy.

Pending Publication Date: 2020-09-04
JIANGSU POLICE INST
View PDF3 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Purpose of the invention: The present invention proposes a method for constructing SAR azimuth resolution imaging in the rotational fractional Fourier transform FrFT domain, which improves the SAR azimuth imaging resolution and solves the problem of low azimuth imaging quality of the traditional method

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
  • Method for constructing SAR azimuth resolution imaging by rotating FrFT domain
  • Method for constructing SAR azimuth resolution imaging by rotating FrFT domain
  • Method for constructing SAR azimuth resolution imaging by rotating FrFT domain

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0065] Such as figure 1 As shown, the rotation fractional Fourier transform FrFT domain of the present invention constructs the SAR azimuth resolution imaging method comprising the following steps:

[0066] Step (1), SAR azimuth direction signal transformation analysis; specifically includes the following contents:

[0067] ① Build azimuth signal model

[0068] In the SAR imaging system, the ideal point target echo is approximately in the form of a chirp signal in the azimuth direction, as shown in formula (1):

[0069] the s a (t)=W a (t)exp(j2πf dc t+jπκ a t 2 ) (1)

[0070] where f dc is the Doppler center frequency, κ a is the azimuth modulation frequency, W a (t)=rect(t / T a ), T a is the synthetic aperture time, and t is the slow time variable. The definition formula of fractional Fourier transform of continuous signal f(x) is:

[0071]

[0072] where K β (u, x) is the kernel function of fractional Fourier transform, as shown in formula (3), β is the rot...

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 method for constructing SAR (Synthetic Aperture Radar) azimuth high-resolution imaging in a FrFT (Fractional Fourier Transform) domain, and relates to the technical field ofimaging, in particular to a method for constructing SAR azimuth high-resolution imaging in the FrFT domain. According to the method, fractional order Fourier transform is carried out on SAR azimuth signals to obtain a calculation expression of an azimuth fractional order, and the order is unique and depends on azimuth frequency modulation rate, azimuth sampling sequence length and azimuth samplingfrequency; and on the basis of the obtained fractional order, completing the construction of the rotating fractional order Fourier transform domain and azimuth high-resolution SAR imaging method. According to the method, the problem of azimuth low-precision imaging of a traditional method is solved in synthetic aperture radar imaging, so that the SAR azimuth imaging resolution is improved, and the current practical application requirement is met.

Description

technical field [0001] The invention relates to a synthetic aperture radar imaging method, in particular to an imaging method for constructing SAR azimuth resolution by rotating an FrFT domain. Background technique [0002] As an active microwave sensor, synthetic aperture radar has the characteristics of realizing all-day and all-weather earth observation without being limited by light and climate conditions, and can penetrate the surface or vegetation to obtain the information covered by it. Broad application prospects. [0003] SAR mounts the small-aperture antenna radar on a moving carrier, uses the relative motion of the radar and various targets in the ground mapping zone, and uses coherent processing to achieve range and azimuth imaging. Common SAR imaging methods include the Range Doppler (RD) method, the wavenumber domain (ωK) method and the CS (Chirp Scaling) method, among which the Range Doppler method is the most common and classic method in SAR imaging processi...

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): G01S13/90
CPCG01S13/90
Inventor 王振力王群马如坡
Owner JIANGSU POLICE INST
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com