CN109031284A - It is a kind of using millimeter wave or the sole safety check apparatus and method of Terahertz radar - Google Patents
It is a kind of using millimeter wave or the sole safety check apparatus and method of Terahertz radar Download PDFInfo
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- CN109031284A CN109031284A CN201811011257.1A CN201811011257A CN109031284A CN 109031284 A CN109031284 A CN 109031284A CN 201811011257 A CN201811011257 A CN 201811011257A CN 109031284 A CN109031284 A CN 109031284A
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- sole
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- millimeter wave
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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
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/887—Radar or analogous systems specially adapted for specific applications for detection of concealed objects, e.g. contraband or weapons
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Radar Systems Or Details Thereof (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The invention discloses a kind of using millimeter wave or the sole safety check apparatus and method of Terahertz radar, timing control signal is sent transmitting antenna and receiving antenna by the time-sequence control module, the electromagnetic wave of the radio frequency source transmitting is converted to millimeter wave or terahertz wave band through spread spectrum module, free space is coupled to by transmitting antenna again, sole region is incident on after wave transparent window transmission, the object scatter echo of the sole region is received via after wave transparent window transmission by receiving antenna, the down conversion module is by the electromagnetic waveform of received millimeter wave or terahertz wave band to microwave frequency band, the data processing module obtains the image of sole region after handling the electromagnetic wave of microwave frequency band.The present invention both can avoid injuring using the ionising radiation of x-ray bombardment bring, the short slab that metal detector is only capable of detection metal can be made up again, it is a kind of safety, fully and effectively sole safety check apparatus, the blank that current sole safety check lacks effective means can be filled up.
Description
Technical field
The present invention relates to a kind of millimeter wave or terahertz imaging safety check technology more particularly to it is a kind of using millimeter wave or
The sole safety check apparatus and method of Terahertz radar.
Background technique
Current human body safety check technology mainly has metal detector, X-ray human body safety check instrument, millimeter wave/Terahertz human body
Several big types such as safety check instrument.Metal detector generates alternating electromagnetic field using wire coil, has metal object when being detected in region
In the presence of body, disturbance of the electromagnetic field by metal object, the wire coil that this disturbance be used to receive signal is sensed, thus
Realize the detection to metal object.X-ray human body safety check instrument uses micro- dose x-ray exposure human body, detects the back scattering of human body
Or transmission X-ray signal, the concealment article carried according to the different discovery body surfaces of the distribution of signal strength.Millimeter wave/terahertz
Hereby human body safety check instrument irradiates human body using millimeter wave/terahertz emission of micropower and detects the scatter echo of human body, or
Passive type imaging directly is carried out using the heat radiation of human body itself, realizes the detection for carrying concealment article to body surface.
But all there are certain drawbacks in the detection of human body sole in these above-mentioned technologies.Metal detector is only capable of detecting
Metal class article deposits the non-metal article that sole carries, such as sintex, slurry explosives, liquid without ability of discovery
In major safety risks.X-ray human body safety check instrument still falls within ionising radiation although dose of radiation is small, multiple by the whole world
Country forbids using in the general safety check of general population.Millimeter wave/Terahertz human body safety check instrument is at present just for human body
The positive back side is detected, and sole region is not belonging to its effective imaging region.Therefore, also lack a kind of device at present, it can be quick
The dangerous goods accurately carried to human body sole are imaged.
Millimeter wave/Terahertz radar has good penetrability to a variety of common clothings, therefore can be used for human body safety check,
The transmission power of this kind of equipment is usually in 1mW or so.But millimeter wave/Terahertz frequency range penetrates to compare and has to a variety of footwear materials
Limit, this lower transmission power are no longer desirable for penetrating sole imaging, therefore are presently available for the millimeter wave of human body safety check/too
Hertz imaging system is also not suitable for that human body is imaged.
Summary of the invention
Technical problem to be solved by the present invention lies in: how the realization of quick nondestructive is to the possible belongings of human body sole
Detection, provide a kind of using millimeter wave or the sole safety check apparatus and method of Terahertz radar.
The present invention is solution above-mentioned technical problem by the following technical programs, it is of the invention it is a kind of using millimeter wave or too
The sole safety check apparatus of hertz radar, including radio frequency source, spread spectrum module, transmitting antenna, wave transparent window, receiving antenna, down coversion
Module, data processing module, time-sequence control module and triggering sensing module；The time-sequence control module is separately connected triggering sensing
Module, transmitting antenna, radio frequency source, receiving antenna and data processing module, the radio frequency source are separately connected spread spectrum module and lower change
Frequency module；The wave transparent window is located under sole to be measured, and the signal that the triggering sensing module triggers sole to be measured is sent
To time-sequence control module, timing control signal is sent transmitting antenna and receiving antenna by the time-sequence control module, described to penetrate
The electromagnetic wave of frequency source transmitting is converted to millimeter wave or terahertz wave band through spread spectrum module, then is coupled to free sky by transmitting antenna
Between, it is incident on sole region after wave transparent window transmission, after the object scatter echo of the sole region is via wave transparent window transmission
It is received by receiving antenna, the down conversion module is by the electromagnetic waveform of received millimeter wave or terahertz wave band to Microwave Frequency
Section, the data processing module obtain the image of sole region after handling the electromagnetic wave of microwave frequency band.
The present apparatus is embedded in security check passage in the ground of tested person's standing or travel region, it can be achieved that human body sole
The quick security check of entrained concealment object.
The radio frequency source is signal generator, generates Step Frequency swept-frequency signal or linear frequency modulation swept-frequency signal, the radio frequency
Source is controlled by time-sequence control module, generates continuous wave signal or pulse signal.
The spread spectrum module includes several up-conversion mixers or frequency multiplier and power amplifier；The up-conversion is mixed
Signal frequency is expanded to millimeter wave or terahertz wave band by frequency device or frequency multiplier, and the power amplifier puts the signal after spread spectrum
Greatly to 100mW or more.
The transmitting antenna and receiving antenna are millimeter wave/Terahertz frequency range electromagnetic horn or paster antenna, are single
A antenna or aerial array.
The wave transparent window is made of polytetrafluoroethylene material.It can be used for bearing the weight of detected person.
The wave transparent window with a thickness of (N+1/4) * λ, wherein N is positive integer, and λ is the central wavelength of system work.It will
The thickness of wave transparent window is arranged to (n+1/4) times of wavelength, then front surface and rear surface echo optical path difference are the wave of (n+0.5) again
Long, the reflection echo of the two can interfere cancellation, to reduce echo.
The down conversion module is to include several frequency mixers or IQ demodulator and two-stage low-noise amplifier；It is described low
Noise amplifier carries out down-converted to radiation signal by frequency mixer or IQ demodulator again after amplifying signal.
The data processing module includes analog-to-digital conversion module and digital image-forming module, and the analog-to-digital conversion module is data
Capture card, efficiently sampling digit are 12bit or more, and the digital imagery module is Signal transacting board analysis or host computer, have been used for
At the generation of image.
The time-sequence control module is the digital board for using FPGA as core devices, for synchronizing at radio frequency source and data
Module is managed, and controls the on-off of transmitting antenna and receiving antenna.
The triggering sensing module is the infrared sensor being installed in security check passage or is installed on human body walking region
Pressure transducer starts safety check process for transmitting a signal to time-sequence control module.
A method of safety check being carried out using the sole safety check apparatus of millimeter wave or Terahertz radar using described, including
Following steps:
(1) detected person, which reaches, specifies region to be measured, and trigger signal carries out safety check；
(2) transmitting antenna and receiving antenna are started to work；
(3) position of each corresponding transmitting antenna sends primary complete swept-frequency signal, acquires all receiving antennas
Echo-signal；
(4) position for changing transmitting antenna and receiving antenna, repeats step (3), until traversing all transmitting antennas and connecing
Receive aerial position；
(5) data are handled and is imaged, and imaging results are exported.
In the step (4), realized using at least one of aerial array switching or mechanical scanning method
Change the position of transmitting antenna and receiving antenna.
The algorithm of imaging of the invention is a kind of imaging algorithm of synthetic aperture radar, and including but not limited to BP is (backward to dissipate
Penetrate, Back Projection), RMA (range migration algorithm, Range Migration Algorithm), (time domain is related by TDC
Algorithm, Time Domain Correlation) etc. common algorithms.
In view of a variety of footwear materials are bad in millimeter wave/Terahertz frequency range permeability, need to take some measures and mention
It rises imaging signal to noise ratio: (1) being amplified transmission power by millimeter wave/Terahertz power amplifier tentatively mature at present；
(2) detection realized to weak echo signal is received by using the highly sensitive of two-stage low-noise amplifier in receiving end；(3)
By controlling the thickness of wave transparent window, short distance echo is eliminated as much as using the principle of interference, (4) pass through high-precision signal
Acquisition completely retains the information of echo-signal；(5) data processing domain is accumulated in using aperture promote signal-to-noise ratio.
The present invention has the advantage that present invention utilizes millimeter wave/terahertz emissions compared with prior art and pacifies to human body
Full feature irradiates human body sole region using millimeter wave/terahertz emission of certain power, and detects scatter echo, is formed
The 3-D image of sole region.Not only it can avoid injuring using the ionising radiation of x-ray bombardment bring, but also metal detector can be made up
It is only capable of the short slab of detection metal, is a kind of safety, fully and effectively sole safety check apparatus, current sole peace can be filled up
Inspection lacks the blank of effective means.
Detailed description of the invention
Fig. 1 is structure principle chart of the invention.
Specific embodiment
It elaborates below to the embodiment of the present invention, the present embodiment carries out under the premise of the technical scheme of the present invention
Implement, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to following implementation
Example.
As shown in Figure 1, the present embodiment include radio frequency source 101, spread spectrum module 102, transmitting antenna 103, wave transparent window 104,
Receiving antenna 105, down conversion module 106, data processing module 107, time-sequence control module 108, triggering sensing module 109；Thoroughly
Wave window 104 is located under sole region to be measured, radio frequency source 101 emit electromagnetic wave by spread spectrum module 102 be converted to millimeter wave/
Terahertz frequency range, then be coupled in free space via transmitting antenna 103, sole area is incident on after the transmission of wave transparent window 104
Domain, the scatter echo of object is received antenna 105 and receives after transmiting via wave transparent window 104 in the region, then passes through lower change
The image of sole region is formed after frequency and data processing.The device is embedded in tested person in security check passage and stands or travel region
In ground, it can be achieved that the quick security check for hiding object entrained by human body sole.
In the present embodiment, radio frequency source 101 be it is a kind of using DDS or VCO as bottom layer signal generator, after up-conversion
Frequency reaches 12GHz or so and is exported, and wherein DDS can be used as a kind of more satisfactory Step Frequency swept-frequency signal generator,
And VCO can be used as a kind of more satisfactory linear FM signal generator.The output port of radio frequency source 101 has switch control,
Its on off operating mode can be realized the switching of continuous wave mode or pulse mode by the control of time-sequence control module 108.
In the present embodiment, spread spectrum module 102 includes 3 No. 2 frequency multipliers, these frequency multipliers cascade one 8 frequency multiplication of composition
Device spreads around signal frequency near 96GHz from 12GHz, is then amplified again by power amplifier, final transmission power
Reach 100mW or more.
In the present embodiment, transmitting antenna 103 and receiving antenna 105 are all made of Fermi's patch antenna array, transmitting antenna
Array and receiving antenna array are made of 50 antennas of 6mm spacing respectively.Transmitting antenna array is parallel with receiving antenna array
Arrangement, intermesh arrangement on array direction.In the present embodiment, to realize the scanning to two-dimentional aperture, it can be set one
A mechanical translator translates transmitting antenna array and receiving antenna array edge perpendicular to array direction.
In the present embodiment, wave transparent window 104 is made of polytetrafluoroethylene material, and thickness is selected as 12.75mm.
In the present embodiment, down conversion module 106 uses a down coversion, will by a second harmonic mixer
Radiation signal near 96GHz is down-converted near 10MHz.It is put before frequency mixer by two-stage low-noise amplifier
Greatly, amplification overall gain reaches 40dB or more.
In the present embodiment, data processing module 107 includes analog-to-digital conversion module and digital image-forming module.Wherein modulus turns
Mold changing block is data collecting card, and efficiently sampling digit is higher than 12bit.Digital imagery module uses blade server, makees
For the carrier of imaging algorithm, the generation of image is completed.
In the present embodiment, time-sequence control module 108 is the digital board for using FPGA as core devices, is penetrated for synchronizing
Frequency source 101 and data processing module 107, and control the on-off of transmitting antenna 103 and receiving antenna 105.
In the present embodiment, triggering sensing module 109 is using the pressure transducer for being installed on human body walking region, for sending out
The number of delivering letters arrives time-sequence control module 108, starts safety check process.
Steps are as follows for safety check:
(1) detected person arrives at effective security inspection area, and triggering sensing module 109 sends a signal to time-sequence control module 108,
Start following safety check step；
(2) time-sequence control module 108 starts transmission timing control signal, and transmitting antenna array and receiving antenna array start
Work, while translation scan device starts to translate；
(3) time-sequence control module 108 sends the on-off of signal control transmitting antenna 103 and receiving antenna 105, for each
The job order of the combination pair of secondary complete swept-frequency signal, transmitting antenna 103 and receiving antenna 105 are as follows: the first transmitting antenna-the
One receiving antenna, second the-the first receiving antenna of transmitting antenna, second the-the second receiving antenna of transmitting antenna, third transmitting antenna-
Second receiving antenna, third transmitting antenna-third receiving antenna, four transmitting antennas-third receiving antenna ... and so on, directly
Work to all transmitting antennas 103, the combination pair of receiving antenna 105 is completed, then again from the beginning, until scanning translation knot
Beam；
(4) data processing and imaging are carried out by data processing module 107, and imaging results is sent out by interface.
In the present embodiment, imaging algorithm uses TDC algorithm.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (12)
1. a kind of using millimeter wave or the sole safety check apparatus of Terahertz radar, which is characterized in that including radio frequency source, spread spectrum mould
Block, transmitting antenna, wave transparent window, receiving antenna, down conversion module, data processing module, time-sequence control module and triggering sensing
Module；The time-sequence control module is separately connected triggering sensing module, transmitting antenna, radio frequency source, receiving antenna and data processing
Module, the radio frequency source are separately connected spread spectrum module and down conversion module；The wave transparent window is located under sole to be measured, described
The signal that sole to be measured triggers is sent time-sequence control module by triggering sensing module, and the time-sequence control module is by timing control
Signal is sent to transmitting antenna and receiving antenna, and the electromagnetic wave of the radio frequency source transmitting is converted to millimeter wave or too through spread spectrum module
Hertz wave band, then free space is coupled to by transmitting antenna, it is incident on sole region after wave transparent window transmission, the sole region
Object scatter echo received via after wave transparent window transmission by receiving antenna, the down conversion module by received millimeter wave or
The electromagnetic waveform of terahertz wave band to microwave frequency band, the data processing module will microwave frequency band electromagnetic wave handle after obtain
The image of sole region.
2. according to claim 1 a kind of using millimeter wave or the sole safety check apparatus of Terahertz radar, which is characterized in that
The radio frequency source is signal generator, generates Step Frequency swept-frequency signal or linear frequency modulation swept-frequency signal, the radio frequency source is by timing
Control module control, generates continuous wave signal or pulse signal.
3. according to claim 1 a kind of using millimeter wave or the sole safety check apparatus of Terahertz radar, which is characterized in that
The spread spectrum module includes several up-conversion mixers or frequency multiplier and power amplifier；The up-conversion mixer or again
Signal frequency is expanded to millimeter wave or terahertz wave band by frequency device, and the signal after spread spectrum is amplified to by the power amplifier
100mW or more.
4. according to claim 1 a kind of using millimeter wave or the sole safety check apparatus of Terahertz radar, which is characterized in that
The transmitting antenna and receiving antenna are millimeter wave/Terahertz frequency range electromagnetic horn or paster antenna, be individual antenna or
Aerial array.
5. according to claim 1 a kind of using millimeter wave or the sole safety check apparatus of Terahertz radar, which is characterized in that
The wave transparent window is made of polytetrafluoroethylene material.
6. according to claim 1 a kind of using millimeter wave or the sole safety check apparatus of Terahertz radar, which is characterized in that
The wave transparent window with a thickness of (N+1/4) * λ, wherein N is positive integer, and λ is the central wavelength of system work.
7. according to claim 1 a kind of using millimeter wave or the sole safety check apparatus of Terahertz radar, which is characterized in that
The down conversion module is to include several frequency mixers or IQ demodulator and two-stage low-noise amplifier；The low noise amplification
Device carries out down-converted, the low-noise amplifier to radiation signal by frequency mixer or IQ demodulator again after amplifying signal
Amplification overall gain reach 40dB or more.
8. according to claim 1 a kind of using millimeter wave or the sole safety check apparatus of Terahertz radar, which is characterized in that
The data processing module includes analog-to-digital conversion module and digital image-forming module, and the analog-to-digital conversion module is data collecting card,
Efficiently sampling digit is 12bit or more, and the digital imagery module is Signal transacting board analysis or host computer, for completing image
It generates.
9. according to claim 1 a kind of using millimeter wave or the sole safety check apparatus of Terahertz radar, which is characterized in that
The time-sequence control module is the digital board for using FPGA as core devices, for synchronizing radio frequency source and data processing module,
And control the on-off of transmitting antenna and receiving antenna.
A kind of existed using millimeter wave or the sole safety check apparatus of Terahertz radar, feature 10. according to claim 1
In the triggering sensing module is that the infrared sensor being installed in security check passage or the pressure for being installed on human body walking region pass
Sensor starts safety check process for transmitting a signal to time-sequence control module.
11. a kind of filled using such as the described in any item sole safety checks using millimeter wave or Terahertz radar of claim 1~10
Set the method for carrying out safety check, which comprises the following steps:
(1) detected person, which reaches, specifies region to be measured, and trigger signal carries out safety check；
(2) transmitting antenna and receiving antenna are started to work；
(3) position of each corresponding transmitting antenna sends primary complete swept-frequency signal, acquires the echo of all receiving antennas
Signal；
(4) position for changing transmitting antenna and receiving antenna, repeats step (3), until traversing all transmitting antennas and receiving day
Line position；
(5) data are handled and is imaged, and imaging results are exported.
12. the method according to claim 11 for carrying out safety check, which is characterized in that in the step (4), using antenna array
At least one of column switching or mechanical scanning method change the position of transmitting antenna and receiving antenna to realize.
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| CN201811011257.1A CN109031284A (en) | 2018-08-31 | 2018-08-31 | It is a kind of using millimeter wave or the sole safety check apparatus and method of Terahertz radar |
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| CN201811011257.1A CN109031284A (en) | 2018-08-31 | 2018-08-31 | It is a kind of using millimeter wave or the sole safety check apparatus and method of Terahertz radar |
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| CN111624672A (en) * | 2020-04-24 | 2020-09-04 | 博微太赫兹信息科技有限公司 | Human body security check system based on frequency division multiplexing technology |
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| CN113093297A (en) * | 2021-03-18 | 2021-07-09 | 北京航空航天大学 | Ellipsoid channel structure suitable for passive millimeter wave three-dimensional imaging security inspection |
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| CN111624672A (en) * | 2020-04-24 | 2020-09-04 | 博微太赫兹信息科技有限公司 | Human body security check system based on frequency division multiplexing technology |
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| CN113093297B (en) * | 2021-03-18 | 2022-07-05 | 北京航空航天大学 | Ellipsoid channel structure suitable for passive millimeter wave three-dimensional imaging security inspection |
| CN113093297A (en) * | 2021-03-18 | 2021-07-09 | 北京航空航天大学 | Ellipsoid channel structure suitable for passive millimeter wave three-dimensional imaging security inspection |
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