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

Diving section FENLCS large squint high-resolution imaging method and system based on sphere model

An imaging method and a technology of the subduction section, which are applied in the field of signal processing, can solve difficult problems, and the processing accuracy cannot reach high-resolution imaging, so as to achieve the effect of improving accuracy

Active Publication Date: 2020-06-12
HANGZHOU DIANZI UNIV
View PDF9 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under this condition, the spatial oblique angle changes in two dimensions, which brings difficulties to RCM correction in the range direction and Doppler parameter equalization in the azimuth direction.
Moreover, the traditional method only makes a first-order approximation to the analytical formula of the spatial variation relationship of point targets after linear range walk correction (LRWC), and the processing accuracy cannot meet the requirements of high-resolution imaging

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
  • Diving section FENLCS large squint high-resolution imaging method and system based on sphere model
  • Diving section FENLCS large squint high-resolution imaging method and system based on sphere model
  • Diving section FENLCS large squint high-resolution imaging method and system based on sphere model

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] This embodiment provides a high-resolution imaging method of FENLCS high squint in the subduction section based on the sphere model, such as Figure 1-2 shown, including:

[0044] S11. Construct the geometric configuration of the SAR imaging in the subduction section of the maneuvering platform, and analyze the echo characteristics of the geometric configuration and the spatial variation characteristics of the spatial oblique angle of view;

[0045] S12. Perform range-wise processing on the echo signal;

[0046] S13. Constructing an equidistant sphere analytical model, and utilizing the residual high-order RCMC method of azimuth space variation to improve the accuracy of the range-wise processing;

[0047] S14. Based on the constructed equidistant sphere analytical model, remodel the Doppler phase of azimuth space variation, use the FENLCS method to remove the Doppler center frequency, realize the balance of Doppler modulation frequency and azimuth, and then perform az...

Embodiment 2

[0165] The difference between the high-resolution high-resolution imaging method of FENLCS in the subduction section based on the sphere model disclosed in this embodiment and the first embodiment is that:

[0166] figure 2 is the geometric configuration of the SAR in the dive segment of the maneuvering platform, in which the radar platform performs a curved acceleration motion along the LMN trajectory. In this dive imaging configuration, the radar platform performs a curved dive motion under the influence of acceleration, and the instantaneous three-dimensional velocity and three-dimensional acceleration of the radar platform are v and a respectively. Slow time t in azimuth a = 0 moment, the motorized platform is located at point L, and its height is h 0 , the center of the beam just irradiates the center point P of the scene 0 , the central slope distance is r c0 , point P 0 The distance from the projection on the ground to the Y axis is r g .

[0167] Table 2 shows ...

Embodiment 3

[0180] This embodiment provides a FENLCS high-squint high-resolution imaging system based on a sphere model, including:

[0181] The first building block is used to construct the geometric configuration of the SAR imaging in the subduction section of the maneuvering platform, and analyze the echo characteristics of the geometric configuration and the spatial variation characteristics of the spatial oblique angle of view;

[0182] a first processing module, configured to perform range-wise processing on the echo signal;

[0183] The second building block is used to construct an equidistant sphere analytical model, and utilizes a residual high-order RCMC method of azimuth space variation to improve the accuracy of the range-wise processing;

[0184] The second processing module is used to remodel the Doppler phase of azimuth space variation based on the equidistant sphere analytical model, use the FENLCS method to remove the Doppler center frequency, realize the balance of Doppl...

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 diving section FENLCS large squint high-resolution imaging method and system based on a sphere model. The diving section FENLCS large squint high-resolution imaging method based on the sphere model comprises the steps of S11, constructing a geometric configuration of maneuvering platform diving section SAR imaging, and analyzing the echo characteristics of the geometric configuration and the space-variant characteristics of a spatial squint angle; S12, carrying out range direction processing on the echo signals; S13, constructing an equidistant sphere analytical model, and improving the range direction processing precision by using an azimuth space-variant residual high-order RCMC method; and S14, re-modeling an azimuth space-variant Doppler phase based on the constructed isometric sphere analytical model, removing the Doppler center frequency by using an FENLCS method to realize the Doppler frequency modulation azimuth equalization, and then performing azimuth compression to obtain a final focused image.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to a method and system for high-squint high-resolution imaging of FENLCS in a subduction section based on a sphere model. Background technique [0002] With its all-weather, all-weather, high-resolution imaging advantages, SAR has made the research of mobile platform SAR imaging technology combined with missiles, drones, helicopters and other high-speed mobile platforms has become a research hotspot today. Due to the flexible and changeable flight trajectory of the maneuvering platform, the SAR imaging process of the maneuvering platform can generally be divided into two stages: straight line and constant speed flight and curved acceleration dive according to the different flight states of the platform. When the maneuvering platform is in the dive mode, the signal echo characteristics are more complicated than those in the general level flight configuration, and the tradit...

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
Inventor 钟华刘静赵荣华李世平王梦圆叶宗奇
Owner HANGZHOU DIANZI 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