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Corner hidden target imaging method based on multi-imaging dictionary fusion

A target imaging and multi-imaging technology, which is applied in the reflection/re-radiation of radio waves, instruments, measuring devices, etc., to achieve the effect of high practicability and simple calculation

Active Publication Date: 2020-04-21
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

[0004] In order to solve the problem of detecting hidden targets at corners in complex urban environments, the present invention proposes an imaging method for hidden targets at corners based on fusion of multiple imaging dictionaries, which can accurately obtain clear radar images of hidden targets behind corners

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  • Corner hidden target imaging method based on multi-imaging dictionary fusion
  • Corner hidden target imaging method based on multi-imaging dictionary fusion
  • Corner hidden target imaging method based on multi-imaging dictionary fusion

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specific Embodiment approach

[0056] Step 1: Probe environment parameter setting;

[0057] The electromagnetic simulation adopts gprMax3.0 software, the simulation scene diagram is as follows figure 2 with image 3 Shown, where figure 2 Schematic diagram of single target electromagnetic simulation, image 3 Schematic diagram of dual-target electromagnetic simulation. The experiment takes the corner O of Wall-2 as the origin of the coordinates, the corner position coordinates of Wall-1 are (3m, 2m), the vertical position of Wall-2’s outer surface is marked as 1m, and the horizontal position of Wall-3’s outer surface is marked as 9m. The dielectric constant of the wall is 6, and the permeability is 0.05S / m; the simulation considers the single target and the multi-target situations. First, the single target coordinates are (4m, 5m), and the positions of the multiple targets are (4m, 5.7m) and (5.3m, 7m), the dielectric constant of the target is 55, and the permeability is 1.05S / m; the simulation radar system a...

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Abstract

The invention discloses a corner hidden target imaging method based on multi-imaging dictionary fusion, and solves the problem of corner hidden target imaging positioning in an urban non-line-of-sightenvironment. Corner hidden target imaging detection is carried out by utilizing diffraction and reflection propagation characteristics of electromagnetic wave signals transmitted by an MIMO radar. Firstly, diffraction and primary reflection propagation characteristics in an L-shaped corner scene are analyzed; a diffraction and primary reflection virtual radar array is constructed based on the electromagnetic propagation characteristics, time delay of different propagation paths of the electromagnetic wave is calculated according to the virtual radar array, a corresponding imaging dictionary is established, and original imaging results containing a real target and a false target are obtained corresponding to the different propagation paths by using a back projection imaging algorithm; andfinally, all original imaging results are multiplied and fused to obtain a radar image only containing a real target. The method is simple in implementation process, can obtain a high-quality accurateradar target image, and can effectively solve a corner multi-target imaging positioning problem.

Description

Technical field [0001] The invention belongs to the technical field of ultra-wideband MIMO radar target imaging, and particularly relates to a corner concealed target imaging method based on fusion of multiple imaging dictionaries. Background technique [0002] Unlike traditional radars that use electromagnetic waves to "direct sight detection", in urban street fighting, anti-terrorism operations, and disaster rescue, threats are usually hidden in the complex building environment. Because they are shielded by buildings, electromagnetic waves cannot be transmitted in a straight line to threats or rescues. Targets can only be detected by "non-direct vision" methods. Because there are a large number of electromagnetic wave reflection and diffraction propagation paths in the complex building environment, compared with electromagnetic transmission propagation, these multi-path propagation electromagnetic energy attenuation is small, there are many available propagation paths, and a va...

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Application Information

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IPC IPC(8): G01S13/89G01S13/88G01S7/41
CPCG01S13/89G01S13/887G01S7/418
Inventor 郭世盛李松林崔国龙罗皓蓝师贞鹏李虎泉孔令讲杨晓波
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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