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No-interpolation three-dimensional active millimeter wave imaging method and system and imaging equipment

A millimeter wave imaging, three-dimensional technology, applied in radio wave measurement systems, radio wave reflection/re-radiation, utilization of re-radiation and other directions, can solve problems such as low imaging resolution

Active Publication Date: 2020-01-31
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The passive imaging system uses the millimeter-wave / terahertz radiometer to detect the thermal radiation distribution of the measured target for imaging, and there is no radiation to the human body at all, but its imaging resolution is relatively low

Method used

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  • No-interpolation three-dimensional active millimeter wave imaging method and system and imaging equipment

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Embodiment 1

[0115] In this embodiment, a non-interpolation 3D active millimeter wave imaging method, the plane scanning 3D active millimeter wave imaging system model is as follows image 3 As shown; the antenna array of the active millimeter wave imaging system is located in the receiving plane z=Z 1 = 0; the distance between the transmitting and receiving antennas of the transmitting and receiving antenna pair on the receiving plane is very small (equivalent to the working wavelength of the millimeter wave), and the midpoint position of the transmitting and receiving antenna pair can be used to approximate the position of the transmitting and receiving antennas during calculation.

[0116] The main parameters of the actual active millimeter wave are as follows:

[0117] The frequency range of the broadband chirp signal is 27-32.8GHz, the bandwidth B=5.8GHz, and the time width T of the chirp signal p = 11μs, modulation frequency center frequency f c = 29.9GHz;

[0118] The equivalen...

Embodiment 2

[0129] This embodiment provides a three-dimensional active millimeter-wave imaging system without interpolation, see figure 2 ,include:

[0130] A data acquisition module, configured to acquire first echo data of the imaging object; wherein, the first echo data includes delineation tones corresponding to the imaging object collected at equal intervals on the receiving plane according to a preset sampling time interval signal s(x 接 ,y 接 , t), wherein, the receiving plane and the imaging object are located in the same three-dimensional coordinate system, the three-dimensional coordinate system includes an x-axis, a y-axis and a z-axis, and the receiving plane is z=Z 1 ,(x 接 ,y 接 ) represents the sampling point on the receiving plane, and t is the time domain;

[0131] A compensation module, configured to perform phase compensation on the first echo data to obtain second echo data s c (x 接 ,y 接 , k); where, f c is the center frequency of the broadband chirp signal cor...

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Abstract

The invention discloses a no-interpolation three-dimensional active millimeter wave imaging method and system and imaging equipment, and aims at realizing three-dimensional imaging on the basis of broadband linear frequency modulation three-dimensional active millimeter wave imaging system parameters and acquired actually measured data by combining the technologies such as Fourier transformation,dechirping phase compensation, parallel calculation and the like. The method does not need an Stolt interpolation operation used by a three-dimensional active millimeter wave holographic imaging algorithm, so that a large number of interpolation operations and extra interpolation errors are avoided, the calculation amount of the imaging process is decreased and the active millimeter wave securitycheck imaging efficiency can be improved.

Description

technical field [0001] The present invention relates to the technical field of millimeter wave imaging, in particular to a non-interpolation three-dimensional active millimeter wave imaging method and system, a storage medium, and an imaging device. Background technique [0002] In recent years, with the development of the economy, the passenger flow of various modes of transportation has been increasing, and the security check work in important places such as airports and railway stations has received extensive attention. In view of the security inspection requirements for hidden contraband carried by the human body in public transportation and important places, conventional technical means (such as metal detection and X-ray detection, etc.) have their limitations and cannot meet the application requirements. Because millimeter wave / terahertz detection has the advantages of high spatial resolution and good penetrability, it can penetrate through clothing and other items to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/88G01S13/89G01V8/10
CPCG01S13/887G01S13/89G01V8/10
Inventor 林川臧杰锋
Owner SOUTHWEST JIAOTONG UNIV
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