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

Improved sub-aperture SAR chirp scaling Omega-K imaging method

An imaging method, high squint technology, applied in the field of SAR imaging, to improve the imaging effect, improve the imaging resolution, and increase the amount of computation

Active Publication Date: 2015-05-06
XIDIAN UNIV
View PDF3 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to propose an improved Omega-K imaging method for sub-aperture SAR with large squint. Sampling solves the spatial variation of the azimuth modulation frequency, thereby improving the imaging quality in the case of high squint
At the same time, the invention can be applied to sub-aperture data imaging, solves the problem of azimuth aliasing due to the small support area of ​​sub-aperture azimuth position, and realizes unified windowing processing of azimuth

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
  • Improved sub-aperture SAR chirp scaling Omega-K imaging method
  • Improved sub-aperture SAR chirp scaling Omega-K imaging method
  • Improved sub-aperture SAR chirp scaling Omega-K imaging method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0031] The present invention will be further described below in conjunction with accompanying drawing:

[0032] refer to Figure 1a , is a schematic diagram of the squint SAR imaging geometric model; the airborne synthetic aperture radar works in the strip mode, and the airborne aircraft flies along the X direction (the azimuth direction of the radar) at a horizontal velocity v. θ 0 is the oblique angle of the beam center, θ BW is the azimuth beam width, H is the flight height, and the shortest distance between the target and the flight path of the aircraft is R B , R 0 is the slant distance when the center of the beam sweeps across the target, point B is the center point of the scene, X n is the distance between any scene scattering point P and point B along the azimuth direction. refer to Figure 1b , is a schematic diagram of the geometric relationship between the carrier aircraft and the scene scattering point on the inclined plane, Figure 1b Among them, point A is ...

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 belongs to the technical field of SAR imaging, and particularly relates to an improved sub-aperture SAR chirp scaling Omega-K imaging method. The method includes the specific steps of firstly, conducting range-direction Fourier transform on original echo data; secondly, conducting azimuth-direction matched filtering on a signal, multiplying the signal by a rotation correction function, and achieving the forward lateral processing for a wave number spectrum supporting area; thirdly, conducting azimuth-direction Fourier transform on the signal, and conducting azimuth resampling interpolation a two-dimensional wave number field; fourthly, multiplying the signal by a unified phase compensation function, conducting expansion Stolt interpolation, and achieving the range-direction spatial position field focusing through the range inverse Fourier transform; fifthly, multiplying the signal by a deramp correction function, conducting azimuth inverse Fourier transform, multiplying the azimuth spatial position by an azimuth position correction function in the azimuth spatial position field, and finally achieving the azimuth-direction wave number field focusing through the azimuth Fourier transform. The method is wide in application range, capable of achieving the high-resolution imaging, and can be used for the fields of ground mapping, target recognition and the like.

Description

technical field [0001] The invention belongs to the technical field of SAR imaging, in particular to an improved Omega-K imaging method for sub-aperture SAR high squint, which can be used for SAR imaging processing of airborne and spaceborne platforms. Background technique [0002] As an active detection tool, SAR (Synthetic Aperture Radar) can perform high-resolution microwave imaging of observation scenes, and has been widely used in the field of remote sensing. It obtains high-resolution characteristics in the range dimension by transmitting broadband signals, while the azimuth dimension uses Doppler information generated by platform motion to achieve high resolution. [0003] In recent years, with the maturity and development of various imaging algorithms, while taking into account the imaging quality, real-time performance has become an essential requirement for many imaging systems. The concept of sub-aperture solves the contradiction between imaging quality and imagi...

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): G01S13/90
CPCG01S13/904G01S13/9041G01S13/9011
Inventor 梁毅怀园园邢孟道别博文
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