Non-uniform space configuration distributed SAR moving target three-dimensional imaging method based on compressed sensing

A space configuration and compressed sensing technology, applied in the field of communication, can solve the problems of large data storage and transmission

Active Publication Date: 2013-12-25
哈尔滨工大雷信科技有限公司
View PDF2 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of large amount of data storage and transmission in the existing three-dimensional imaging of distributed

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
  • Non-uniform space configuration distributed SAR moving target three-dimensional imaging method based on compressed sensing
  • Non-uniform space configuration distributed SAR moving target three-dimensional imaging method based on compressed sensing
  • Non-uniform space configuration distributed SAR moving target three-dimensional imaging method based on compressed sensing

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0025] Specific implementation mode one: the following combination figure 1 Describe this embodiment, the non-uniform spatial configuration based on compressed sensing distributed SAR moving target three-dimensional imaging method described in this embodiment, the implementation steps of the method are:

[0026] Step 1. Establish a three-dimensional over-complete dictionary for moving objects: the over-complete dictionary refers to a given column vector containing M elements, which is expressed as a linear combination of Q generating vectors; wherein, M and Q are both positive Integer; when M=Q, and the Q vectors are independent of each other, then the column vector containing M elements can be uniquely represented, then the Q vectors are called a set of bases; and when Q>M When , these Q elements are called an over-complete dictionary;

[0027] Assuming that the three-dimensional position model and the velocity model of the ground scattering point are variables, and satisfy ...

specific Embodiment approach 2

[0040] Specific implementation mode two: the following combination figure 1 Describe this embodiment, this embodiment will further explain Embodiment 1, the specific implementation process of establishing a three-dimensional over-complete dictionary for moving objects described in step 1 described in this embodiment is:

[0041] Step A: First, the original echo signal r in the area covered by the SAR is sparsely represented, so that the signal can be represented as a combination of a series of base signals:

[0042] Introduce the discrete echo model:

[0043] S P ( t ^ , t m ) = rect [ t ^ - 2 R ( t m ...

specific Embodiment approach 3

[0071] Specific implementation mode three: the following combination figure 1 Describe this embodiment, this embodiment will further explain Embodiment 1, the specific implementation method of the overcomplete-based tracking moving target 3D imaging technology described in step 2 of this embodiment is:

[0072] The sparse representation of the echo signal r on the over-complete dictionary is obtained from step 1, and the three-dimensional over-complete dictionary Φ of the moving target has the restricted isometry property of the matrix, and the following noisy model is used to obtain the three-dimensional position information of the moving target with velocity information:

[0073] r=Φ(v)S+n=AXS+n (15)

[0074] Among them, A is the coefficient corresponding to each element in the three-dimensional over-complete dictionary Φ of the moving target; X is each element in the three-dimensional over-complete dictionary Φ of the moving target;

[0075] Let n represent Gaussian white...

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 provides a non-uniform space configuration distributed SAR moving target three-dimensional imaging method based on compressed sensing, and belongs to the field of communication field. The method aims to solve the data storage problem of existing distributed SAR moving target three-dimensional imaging and the problem that transmission amount is large. The method includes the first step of building a moving target three-dimensional redundant dictionary and the second step of using a redundant-basis pursuit moving target three-dimensional imaging technology, wherein the first step includes the steps of combining geometry characteristics of non-uniform space configuration and three-dimensional position information and speed information of a ground moving target, dividing an observation area into a plurality of independent observation units, building a complete ground scattering point observation model and building the dictionary according to a discrete echo model, and the second step includes the steps of carrying out sparse decomposition on a non-uniform space configuration distributed SAR echo signal according to the dictionary built in the first step, converting a sparse solving problem into a convex optimization problem through a basic tracking signal reconstruction method, obtaining the three-dimensional information and the speed information of the moving target from a reconstruction signal and finishing three-dimensional imaging. The non-uniform space configuration distributed SAR moving target three-dimensional imaging method is used in distributed SAR moving target three-dimensional imaging.

Description

technical field [0001] The invention relates to a three-dimensional imaging method of a distributed SAR moving target with non-uniform spatial configuration based on compressed sensing, and belongs to the field of communication. Background technique [0002] Distributed SAR has the ability to obtain three-dimensional information of moving targets. However, on the one hand, because data acquisition is limited by Nyquist theory, the amount of data required for 3D imaging of moving targets is large, and the system often cannot bear the burden brought by data storage and transmission; on the other hand, due to the large number of target positions to be determined, the signal Reconstruction is far more difficult than two-dimensional imaging, and there is no perfect method at present. [0003] Synthetic Aperture Radar (SAR, Synthetic Aperture Radar) is a remote sensing system that can generate high-resolution target scene images all day and all day. Traditional SAR is a single-c...

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): G01S13/90G01S7/41
Inventor 刘梅张雷
Owner 哈尔滨工大雷信科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap