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3D imaging method of distributed SAR moving targets with non-uniform spatial configuration based on compressive 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: 2015-09-16
哈尔滨工大雷信科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 SAR moving targets, and to provide a method for three-dimensional imaging of distributed SAR moving targets based on compressed sensing with non-uniform spatial configuration

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  • 3D imaging method of distributed SAR moving targets with non-uniform spatial configuration based on compressive sensing
  • 3D imaging method of distributed SAR moving targets with non-uniform spatial configuration based on compressive sensing
  • 3D imaging method of distributed SAR moving targets with non-uniform spatial configuration based on compressive sensing

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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...

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Abstract

A non-uniform spatial configuration distributed SAR moving target three-dimensional imaging method based on compressed sensing belongs to the field of communications. The present invention solves the problem of large data storage and transmission volume in existing distributed SAR moving target three-dimensional imaging. This method is: 1. Establishment of a three-dimensional over-complete dictionary of moving targets: combined with the geometric characteristics of non-uniform spatial configuration, the three-dimensional position information and velocity information of ground moving targets, the observation area is divided into several independent observation units, and a complete dictionary is established. Ground scattering point observation model, and establish a dictionary based on the discrete echo model; 2. Overcomplete-based tracking moving target three-dimensional imaging technology: Based on the dictionary established in step 1, the non-uniform spatial configuration distributed SAR echo signal Perform sparse decomposition, use the basis tracking signal reconstruction method to convert the sparse solution problem into a convex optimization problem, and obtain the three-dimensional position information and velocity information of the moving target from the reconstructed signal to complete three-dimensional imaging. Used for distributed SAR three-dimensional imaging of moving targets.

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

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90G01S7/41
CPCH04N25/00
Inventor 刘梅张雷
Owner 哈尔滨工大雷信科技有限公司
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