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

Large-angle non-uniform rotation space target ISAR imaging method

A technology of rotating space and imaging method, which is applied in the direction of radio wave reflection/re-radiation, using re-radiation, measuring devices, etc., which can solve the problems of difficult to quickly and accurately obtain the target rotation parameters, large amount of calculation, etc.

Active Publication Date: 2019-11-26
NAT UNIV OF DEFENSE TECH
View PDF11 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the non-cooperative nature of the target, the method of estimating the motion parameters at the same time has to solve and fit all the distance units, and the amount of calculation is large, so it is difficult to quickly and accurately obtain the rotation parameters of the target

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
  • Large-angle non-uniform rotation space target ISAR imaging method
  • Large-angle non-uniform rotation space target ISAR imaging method
  • Large-angle non-uniform rotation space target ISAR imaging method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0079] The present invention will be further described below in conjunction with accompanying drawing:

[0080] figure 1 It is the general processing flow of the present invention.

[0081] An ISAR imaging method for a large-angle non-uniform rotating space object described in the present invention, the method includes the following steps:

[0082] S1: radar echo pulse compression;

[0083] S2: One-dimensional range image translation compensation;

[0084] S3: Fitting target rotation parameters based on radar measurement parameters;

[0085] S4: Rotation center estimation and high-order term compensation based on minimum entropy;

[0086] S5: Non-uniform sampling with slow time between pulses;

[0087] S6: Correction of over-distance unit walking based on Keystone transformation;

[0088] S7: Azimuth to Fourier transform to acquire ISAR images.

[0089] The beneficial effects of the present invention will be tested with simulation data below.

[0090] like figure 2 a...

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 the inverse synthetic aperture radar imaging signal processing technology, and especially relates to a large-angle non-uniform rotation space target ISAR imaging method. Basedon attitude stability of a space target, a corner change curve of the target is calculated according to radar narrowband tracking information, and non-uniform rotation parameters of the space targetare fitted. Then, rotation center searching is performed on one-dimensional distance image data obtained after translational compensation, and high-order phase and envelope walk momentum compensationcaused by a large rotation angle is achieved. Slow-time non-uniform resampling is performed based on a condition that a scattering point Doppler frequency caused by non-uniform rotation is changed along with time so that the Doppler frequency in an azimuth direction is constant. And finally, Keystone transform is adopted to eliminate distance-crossing unit walking, azimuth compression is realizedthrough Fourier transform, a high-quality target ISAR image is obtained, and an ISAR imaging problem under the condition of space target large-rotation-angle non-uniform rotation is effectively solved. The method plays an important role in promoting broadband radar target identification to develop towards practical and fine directions.

Description

technical field [0001] The invention relates to an inverse synthetic aperture radar (Inverse Synthetic Aperture Radar, ISAR) imaging signal processing technology, in particular to an ISAR imaging method for a large-angle non-uniform rotating space target. Background technique [0002] ISAR has the ability of two-dimensional high-resolution imaging of non-cooperative targets, and is widely used in various military and civilian backgrounds. The high resolution in the range direction can be obtained by transmitting a large bandwidth signal, while in the azimuth direction, the high resolution is obtained by using the phase modulation generated by the rotation of the target relative to the radar line of sight. Generally speaking, in order to better interpret the target, the azimuth resolution of the ISAR image should be equivalent to the range resolution. Therefore, after obtaining a high resolution in the range direction, the resolution in the azimuth direction needs to be impr...

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 田彪卢哲俊霍凯刘永祥黎湘姜卫东
Owner NAT UNIV OF DEFENSE TECH
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