CN109782367A - A kind of safe examination system and safety inspection method - Google Patents
A kind of safe examination system and safety inspection method Download PDFInfo
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- CN109782367A CN109782367A CN201910033064.4A CN201910033064A CN109782367A CN 109782367 A CN109782367 A CN 109782367A CN 201910033064 A CN201910033064 A CN 201910033064A CN 109782367 A CN109782367 A CN 109782367A
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- predeterminated position
- examination system
- safe examination
- antenna array
- body frame
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
- G01V8/10—Detecting, e.g. by using light barriers
- G01V8/20—Detecting, e.g. by using light barriers using multiple transmitters or receivers
Abstract
This application provides a kind of safe examination system and safety inspection methods.The safe examination system includes: main body frame, is provided with multiple predeterminated positions, multiple predeterminated positions include the first predeterminated position and the second predeterminated position, and the first predeterminated position and the second predeterminated position interval are arranged；Antenna boom is movably arranged on main body frame；Aerial array group is arranged on antenna boom；Scanner driver is arranged on antenna boom, and couples with aerial array group；When antenna boom is moved to the first predeterminated position or the second predeterminated position of main body frame, scanner driver driving aerial array group is scanned object to be checked, to obtain scan image.By above-mentioned safe examination system, the processing data volume during safety check can be reduced and speed data processing speed.
Description
Technical field
This application involves safety check technical fields, more particularly to a kind of safe examination system and safety inspection method.
Background technique
Terahertz emission as other radiation such as visible light, infrared and X-ray, can be used as object as a kind of light source
The signal source of body imaging.And terahertz emission has perspectivity, low energy non-destructive and spectrally resolved characteristic, leads it in imaging
Domain has unique characteristic and application.Develop at present there are many terahertz imaging method, as skill is imaged in terahertz time-domain spectroscopy
Art, the imaging of continuous THz wave and the imaging of THz wave flight time etc..
However due to each pixel of terahertz time-domain spectroscopy imaging technique include be entire terahertz pulse when
Domain waveform, the cylinder formula Terahertz safety check instrument of the prior art is in order to generate more complete, more accurate tri-dimensional picture, generally by antenna
Array acquisition to all scan datas be used to the generation of 3-D image.But since during the scanning process, aerial array obtains
Scan data it is huge, if all scan datas be used to generate 3-D image, Terahertz safety check instrument data processing data become
Slowly, safety check inefficiency.
Summary of the invention
This application provides a kind of safe examination system and safety inspection methods, mainly solving the technical problems that how to reduce safety check
The reduction of system handles data volume and speeds data processing speed.
In order to solve the above technical problems, this application provides a kind of safe examination system, the safe examination system includes:
Main body frame, is provided with multiple predeterminated positions, and the multiple predeterminated position includes that the first predeterminated position and second are pre-
If position, and first predeterminated position and second predeterminated position interval are arranged；
Antenna boom is movably arranged on the main body frame；
Aerial array group is arranged on the antenna boom；
Scanner driver is arranged on the antenna boom, and couples with the aerial array group；
It is described to sweep when the antenna boom is moved to the first predeterminated position or the second predeterminated position of the main body frame
Retouching driver drives the aerial array group to be scanned object to be checked, to obtain scan image.
In order to solve the above technical problems, the safety inspection method is applied to above-mentioned present invention also provides a kind of safety inspection method
Safe examination system；
The safety inspection method includes:
The sampled data of object to be checked is acquired, and orientation rarefaction representation is carried out to the sampled data, obtains sparse table
Sampled data after showing；
Sampled data after the rarefaction representation is imaged, scan image is obtained；
Sampled data after the rarefaction representation of part is imaged, reference picture is obtained；
Interference processing carried out to the scan image according to the reference picture, and to the interference treated scanning figure
As carrying out sparse reconstruction, the three-dimensional frequency spectrum of the scan image is obtained；
Sinc interpolation processing is carried out to the three-dimensional frequency spectrum, and the three-dimensional frequency spectrum carries out in three-dimensional inverse Fu to treated
Leaf transformation obtains 3-D image.
Compared with prior art, the beneficial effect of the application is: multiple predeterminated positions are provided on main body frame, wherein
Multiple predeterminated positions include the first predeterminated position and the second predeterminated position, and the first predeterminated position is set with the second predeterminated position interval
It sets；Aerial array group is arranged on antenna boom, and as antenna boom moves in main body frame, when antenna boom is moved to
When the first predeterminated position of main body frame or the second predeterminated position, scanner driver drives aerial array group to carry out object to be checked
Scanning, to obtain scan image, aerial array group obtains scan data in the first predeterminated position and the second predeterminated position, then root
Scan image is generated according to above-mentioned scan data, all scan datas without obtaining the acquisition of aerial array group can be effective
Reduce safety check during processing data volume and speed data processing speed.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.Wherein:
Fig. 1 is the structural schematic diagram of one embodiment of the application safe examination system；
Fig. 2 is the structural schematic diagram of one embodiment of aerial array group set-up mode in Fig. 1；
Fig. 3 is the structural schematic diagram of another embodiment of aerial array group set-up mode in Fig. 1；
Fig. 4 is the structural schematic diagram of one embodiment of aerial array group in Fig. 1；
Fig. 5 is the flow diagram of one embodiment of the application safety inspection method.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete
Site preparation description, it is clear that described embodiment is only a part of the embodiment of the application, instead of all the embodiments.It is based on
Embodiment in the application, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall in the protection scope of this application.
Present applicant proposes a kind of safe examination systems 100, and specifically referring to Figure 1, Fig. 1 is one embodiment of the application safe examination system
Structural schematic diagram.
As shown in Figure 1, safe examination system 100 includes at least main body frame 11, antenna boom 12 and is separately positioned on antenna
Aerial array group 13 and scanner driver 14 on cantilever 12.
Wherein, main body frame 11 is a cylinder formula frame.Main body frame 11 further includes movable guiding rail (not shown),
Movable guiding rail moves back antenna boom 12 in main body frame 11 along movable guiding rail for connecting antenna boom 12
It is dynamic.
At least one end of antenna boom 12 is connect with the movable guiding rail of the top frame of main body frame 11 or bottom frame, so that antenna is outstanding
Arm 12 can be moved along the top frame or bottom frame of main body frame 11.Scanner driver 14 and antenna array are provided on antenna boom 12
Column group 13, wherein aerial array group 13 and scanner driver 14 couple.
Main body frame 11 is perpendicular to the ground, so that the terahertz signal energy that the aerial array group 13 on antenna boom 12 issues
It is enough transmitted directly in subject's body to be checked.The length of main body frame 11 is set as 2.04m~2.16m, for example, working as main body frame
When 11 height is set as 2.08m, the height of aerial array group 13 can cover the height of normal human, in aerial array group 13
Aerial array issue terahertz signal can cover the human region in vertical direction, to obtain more accurate safety check number
According to.
When object to be checked is entered in the main body frame 11 of safe examination system 100, scanner driver 14 can drive aerial array
Object to be checked in 13 pairs of main body frames 11 of group is scanned, to obtain scan image.
Further, multiple predeterminated positions are provided in main body frame 11, wherein multiple predeterminated positions include first default
Position 111 and the second predeterminated position 112, and the first predeterminated position 111 and the second predeterminated position 112 interval are arranged.When antenna is outstanding
When arm 12 is moved to the first predeterminated position 111 and the second predeterminated position 112 of main body frame 11, scanner driver 14 drives antenna
Array group is scanned object to be checked, to obtain scan image.
In the present embodiment, aerial array group 13 obtains scanning in the first predeterminated position 111 and the second predeterminated position 112
Data, or obtain the scan data of the first predeterminated position 111 and the second predeterminated position 112；Then according to above-mentioned scan data
Scan image is generated, all scan datas without obtaining the acquisition of aerial array group, during capable of effectively reducing safety check
Processing data volume and speed data processing speed.
First predeterminated position 111 and the second predeterminated position 112 of the present embodiment can be according to the one or seven Barker codes
" 1110010 " set-up mode or the two or seven Barker code " 0100111 " set-up mode setting.Specifically, on main body frame 11
It is disposed with first position, the second position, the third place, the 4th position, the 5th position, the 6th position and the 7th from left to right
Position, wherein the region area and size of above-mentioned position are all the same.
As shown in Fig. 2, the first predeterminated position 111 can be arranged according to the one or seven Barker code " 1110010 " set-up mode
For the position of formation combined by first position, the second position and the third place, then the second predeterminated position 112 can be set to the 6th
Position.In other embodiments, as shown in figure 3, the first predeterminated position 111 can also be according to the two or seven Barker code
" 0100111 " set-up mode is set as the second position, then the second predeterminated position 112 can be set to the 5th position, the 6th position
With the position of formation combined by the 7th position.
In above two set-up mode, space bit is provided between the first predeterminated position 111 and the second predeterminated position 112
It sets, wherein the size of blank position is twice of the second predeterminated position 112.
In the present embodiment, when the first predeterminated position 111 and second that antenna boom 12 is moved to main body frame 11 is preset
First in the 4th position, the 5th position and the 7th position or Fig. 3 when predeterminated position other than post-11.2, i.e. in Fig. 2
It sets, the third place and the 4th position, scanner driver 14 stop driving aerial array group 13.
Alternatively, scanner driver 14 drives aerial array group 13 right when antenna boom 12 moves on main body frame 11
Object to be checked is scanned, to obtain initial data.At this point, scanner driver 14 obtains a large amount of, complete initial data, peace
Check system 100 can be according to the one or seven Barker code " 1110010 " set-up mode or the two or seven Barker code " 0100111 " setting
Mode carries out sparse sampling to initial data, to obtain adopting corresponding to the first predeterminated position 111 and the second predeterminated position 112
Sample data.
Further, as shown in figure 4, aerial array group 13 includes at least a column transmitting antenna array 131 and a column receive
Aerial array 132, wherein transmitting antenna array 131 and a column receiving antenna array 132 are disposed in parallel on antenna boom 12.
Transmitting antenna array 131 includes at least one transmitting antenna array element 1311, and receiving antenna array 132 includes at least
Two receiving antenna array elements 1321, and the quantity of receiving antenna array element 1321 is greater than the quantity of transmitting antenna array element.Wherein, multiple
Receiving antenna array element 1321 and multiple transmitting antenna array elements 1311 are disposed alternately on antenna boom 12.
The operating mode of transmitting antenna array element 1311 and receiving antenna array element 1321 is as follows: when object to be checked enters body frame
After frame 11, antenna boom 12 is along X-direction with θaAngle carries out mechanical scanning interval sampling, and total sampling angle is φ；One
Transmitting antenna array element 1311 and two receiving antenna array elements 1321 form one group of antenna array tuple (not shown), every group of antenna
Array element group realizes that electricity sweeps sampling by electric-controlled switch switch operating state, such as object to be checked is adopted in the completion of aerial array group 13
Sample.
Specifically, aerial array group 13 is switched by PC control, and each group antenna array tuple is sequentially completed from the top down
The transmission of signal；The terahertz signal of every transmission of left side transmitting antenna array element 1311, it is corresponding in right side receiving antenna array 132
Two receiving antenna array elements 1321 receive the terahertz signal for once carrying object information to be checked respectively.
Wherein, transmitting antenna array element 1311 and receiving antenna array element 1321 are the square electromagnetic horn of side length 1cm.
By foregoing description as it can be seen that the safe examination system 100 of the application is in sampling, by the mechanical rotation of antenna boom 12 and
The working condition of electric-controlled switch switched antenna array group 13 completes height to the scan data acquisition with orientation；Use antenna array
Column group 13 receives the FM signal with certain bandwidth.The data volume that the cylinder scanning collection mode of the present embodiment is related to is larger,
Data processing was needed using the long period, therefore dilute to initial data progress according to Barker code " 1110010 " or " 0100111 "
Sampling is dredged, processing data volume can be effectively reduced and speeds data processing speed.
Safe examination system 100 based on the above embodiment, the application also proposed a kind of safety inspection method, specifically refer to Fig. 5,
Fig. 5 is the flow diagram of one embodiment of the application safety inspection method.
The safety inspection method of the present embodiment specifically includes the following steps:
S11: acquiring the sampled data of object to be checked, and carry out orientation rarefaction representation to sampled data, sparse to obtain
Sampled data after expression.
In the case where guaranteeing that signal characteristic data are constant, in order to reduce the data volume of imaging, the peace of the present embodiment
Detecting method uses sampling of the length for 7 Barker code " 1110010 " or " 0100111 " completion to initial data, to be checked to obtain
The sampled data of object.Wherein, Barker code has sharp auto-correlation function and good randomness, can effectively avoid image grid
Valve and minor lobe bring energy leakage guarantee safety check effect.
Wherein, when object to be checked is in main body frame, aerial array group is to human body imaging region any point pn(xn,
yn,zn) sampled, to obtain the sampled data of object to be checked.
If terahertz signal passes through after object to be checked, scattering strength is σn, antenna receives p when t momentnThe echo at place
Data are as follows:
Firstly, carrying out time or distance to Fourier transformation, transformed sampled data to the received echo data of time domain
Expression are as follows:
Then, on frequency domain, sparse imaging is carried out to above-mentioned transformed sampled data, wherein define kxkykzPoint
Not Wei x, y, the wave number in the direction z, thenEnable krFor the wavenumber components of X-Y planeIt is flat
Surface wave is cumulative to be indicated are as follows:
Wherein, M is orientation imaging unit number.
Ith sample distance can be indicated to wave number and j-th of height of sampling to the echo-signal at wave number are as follows:
Sij(θa)=φkα
Wherein, Sij=H φ α, H are Barker code sampling matrix.
S12: the sampled data after rarefaction representation is imaged, scan image is obtained.
S13: the sampled data after the rarefaction representation of part is imaged, reference picture is obtained.
S14: carrying out interference processing to scan image according to reference picture, and treated that scan image carries out is dilute to interference
It dredges and rebuilds, obtain the three-dimensional frequency spectrum of scan image.
Wherein, safety inspection method rebuilds spatial domain reference image data σ-using the fully sampled data in part in sampled data
Ref, the complex image data σ constituted to sampled data carries out interference processing, to realize data compression.σ-ref is using fully sampled
The reference complex image of data configuration, interference treated image expression are as follows:
σnew=| σ | exp { j [∠ (σ)-∠ (σref)]}
Further, safe examination system carries out sparse reconstruction to interference treated scan image, obtains the three-dimensional frequency of complex pattern
Compose α-new, specific formula for calculation are as follows:
P=diag { exp (j ∠ σref)}
Wherein, αnewFor the three-dimensional frequency spectrum of the scan image.P is the coordinate of the scan image.
S15: carrying out sinc interpolation processing to three-dimensional frequency spectrum, and the three-dimensional three-dimensional inverse Fourier of frequency spectrum progress becomes to treated
It changes, to obtain 3-D image.
Wherein, safety inspection method can carry out sinc interpolation processing to three-dimensional frequency spectrum, to obtain in spatial domain according to sampling theorem
Equally distributed data, and carry out 3-D inverse Fourier transform and obtain focusing good human body safety check three-dimensional complex pattern.Wherein, make
It can be effectively reduced with sinc function interpolation method due to interpolation bring signal impairment.
The foregoing is merely presently filed embodiments, are not intended to limit the scope of the patents of the application, all to utilize this
Equivalent structure or equivalent flow shift made by application specification and accompanying drawing content, it is relevant to be applied directly or indirectly in other
Technical field similarly includes in the scope of patent protection of the application.
Claims (10)
1. a kind of safe examination system, which is characterized in that the safe examination system includes:
Main body frame, is provided with multiple predeterminated positions, and the multiple predeterminated position includes the first predeterminated position and the second default position
It sets, and first predeterminated position and second predeterminated position interval are arranged；
Antenna boom is movably arranged on the main body frame；
Aerial array group is arranged on the antenna boom；
Scanner driver is arranged on the antenna boom, and couples with the aerial array group；
When the antenna boom is moved to the first predeterminated position or the second predeterminated position of the main body frame, the scanning is driven
Dynamic device drives the aerial array group to be scanned object to be checked, to obtain scan image.
2. safe examination system according to claim 1, which is characterized in that be disposed with from left to right on the main body frame
First position, the second position, the third place, the 4th position, the 5th position, the 6th position and the 7th position；
Wherein, first predeterminated position includes the first position, the second position and the third place, and described second
Predeterminated position is the 6th position；
Alternatively, first predeterminated position is the 6th position, second predeterminated position includes the first position, described
The second position and the third place.
3. safe examination system according to claim 2, which is characterized in that wherein, the multiple predeterminated position further includes third
Predeterminated position, the third predeterminated position include the default position other than first predeterminated position and second predeterminated position
It sets；
When the antenna boom is moved to the third predeterminated position of the main body frame, the scanner driver stops driving institute
State aerial array group.
4. safe examination system according to claim 3, which is characterized in that when the antenna boom is moved up in the main body frame
When dynamic, the scanner driver drives the aerial array group to be scanned object to be checked, to obtain initial data；And to institute
It states initial data and carries out sparse sampling, obtain the sampled data of first predeterminated position and second predeterminated position.
5. safe examination system according to claim 1, which is characterized in that the aerial array group include transmitting antenna array and
Receiving antenna array；
Wherein, the transmitting antenna array includes at least one transmitting antenna array element, and the receiving antenna array includes at least two
A receiving antenna array element, the quantity of the transmitting antenna array element of the transmitting antenna array are less than the reception of the receiving antenna array
The quantity of bay；
Wherein, the scanner driver drives the transmitting antenna array and the reception day using the transceiver mode of single-emission and double-receiving
Linear array.
6. safe examination system according to claim 5, which is characterized in that the safe examination system is cylinder formula safe examination system, institute
The main body frame length for stating cylinder formula safe examination system is 2.00m~2.16m；
Wherein, the transmitting antenna array element and the receiving antenna array element are the square electromagnetic horn of side length 1cm.
7. a kind of safety inspection method, which is characterized in that the safety inspection method is applied to described in any one of the claims 1~6
Safe examination system；
The safety inspection method includes:
The sampled data of object to be checked is acquired, and orientation rarefaction representation is carried out to the sampled data, after obtaining rarefaction representation
Sampled data；
Sampled data after the rarefaction representation is imaged, scan image is obtained；
Sampled data after the rarefaction representation of part is imaged, reference picture is obtained；
Interference processing carried out to the scan image according to the reference picture, and to the interference treated scan image into
The sparse reconstruction of row, obtains the three-dimensional frequency spectrum of the scan image；
Sinc interpolation processing is carried out to the three-dimensional frequency spectrum, and the three-dimensional inverse Fourier of three-dimensional frequency spectrum progress becomes to treated
Get 3-D image in return.
8. safety inspection method according to claim 7, which is characterized in that the step of the sampled data of the acquisition object to be checked
Suddenly, further comprise:
The initial data of object to be checked is acquired, and rarefaction is carried out to the initial data using Barker code sampling criterion, is obtained
The sampled data of the object to be checked.
9. safety inspection method according to claim 8, which is characterized in that described sparse to sampled data progress orientation
The step of expression, further comprises:
To the sampled data in orientation rarefaction representation are as follows:
Sij(θa)=φkα
Sij=H φ α
Wherein, F is that spatial domain dissipates intensity σnWave number frequency spectrum, α is the frequency-domain sparse vector of orientation target scattering intensity, and φ is
The observing matrix of orientation, H are Barker code sampling matrix.
10. safety inspection method according to claim 9, which is characterized in that it is described according to the reference picture to the scanning
Image carries out the step of interference processing, further comprises:
The calculation formula of the interference processing are as follows:
Described the step of sparse reconstruction is carried out to interference treated the scan image, further comprise:
The calculation formula of the sparse reconstruction are as follows:
P=diag { exp (j ∠ σref)}
Wherein, αnewFor the three-dimensional frequency spectrum of the scan image.P is the coordinate of the scan image.
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| CN201910033064.4A CN109782367A (en) | 2019-01-14 | 2019-01-14 | A kind of safe examination system and safety inspection method |
| PCT/CN2019/121758 WO2020147438A1 (en) | 2019-01-14 | 2019-11-28 | Security inspection system and security inspection method |
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| CN111272096A (en) * | 2020-03-09 | 2020-06-12 | 浙江云特森科技有限公司 | Three-dimensional scanning device and security inspection equipment |
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