CN207352187U - Millimeter wave real time imagery safety detecting system - Google Patents
Millimeter wave real time imagery safety detecting system Download PDFInfo
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- CN207352187U CN207352187U CN201720945704.5U CN201720945704U CN207352187U CN 207352187 U CN207352187 U CN 207352187U CN 201720945704 U CN201720945704 U CN 201720945704U CN 207352187 U CN207352187 U CN 207352187U
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Abstract
The utility model provides a kind of millimeter wave real time imagery safety detecting system, including：Transmission device, millimeter wave transceiving module, aerial array, switch arrays, switch control unit, quadrature demodulation and data acquisition module and image-display units.The millimeter wave real time imagery safety detecting system of the utility model is by using Inverse Synthetic Aperture Radar (ISAR) image-forming principle, when checked object is moved to its real time imagery, not only increase image taking speed, also expand visual field, security staff just can determine whether it carries dangerous goods by observing the graphics of tested personnel's body, so as to eliminate security staff using rays safety detection apparatus on the body of tested personnel to move back inconvenience that movable property is given birth to the problem of.
Description
Technical field
The utility model belongs to safe examination system field, is to be related to a kind of millimeter wave real time imagery to examine safely more specifically
Examining system.
Background technology
In recent years, safety problem increasingly obtains the concern of the people of the world, and the reliability and intelligence of safe examination system are also carried
The requirement of higher is gone out.
Traditional metal detector can only be detected closely small range target, and efficiency is low, far can not meet
The demand of safety check.Although the various rays such as X-ray have very strong penetration power, radiation injury can be caused to tested human body, even if
The X-ray machine of low radiation dose is there is currently, but it is still not easy to be accepted by the public.Infrared ray be by body surface temperature into
Picture, can not blur-free imaging in the case where there is fabric to block.And millimeter wave imaging system can not only detect to be hidden in fabric
Under metal object, can also detect that the dangerous material such as plastics pistol, explosive, the information of acquisition is more detailed, accurate, Ke Yi great
The earth reduces false alarm rate.Therefore, mm-wave imaging technology has obtained more being widely applied in personnel's safety check etc. in recent years.
Mm-wave imaging technology can use and arrive millimetre-wave radar.Millimetre-wave radar refers to radar emission signal frequency in millimeter
Wave frequency section, the frequency of millimeter wave is 30GHz to 300GHz (wavelength is from 1mm to 10mm), in practical engineering application, often millimeter
The low end frequency of ripple drops to 26GHz.In electromagnetic spectrum, the position of millimeter-wave frequency between microwave and it is infrared between.With microwave
Compare, the typical feature of millimeter wave is that wavelength is short, bandwidth (have very wide utilize space) and propagation in an atmosphere
Characteristic.Compared with infrared, millimeter wave has the ability of all weather operations and can be used under the adverse circumstances such as flue dust, cloud and mist.
In the case that microwave frequency band is more and more crowded, the advantages of millimeter wave takes into account microwave, and be also equipped with not available for low-frequency range microwave
Some advantages.
Specifically, millimeter wave mainly has following feature：1st, precision is high, and millimetre-wave radar is easier to obtain narrow ripple
Beam and big absolute bandwidth so that millimetre-wave radar system anti-electronic jamming capability is stronger；2nd, in Doppler radar, millimeter wave
Doppler frequency resolution it is high；3rd, in millimeter wave imaging system, millimeter wave is sensitive to the shape and structure of target, distinguishes metal
The ability of target and background environment is strong, and the image resolution ratio of acquisition is high, therefore can improve to target identification and detectivity 4, milli
Metric wave can penetrate plasma；5th, compared with infrared laser, millimeter wave is influenced small by extreme natural environment；6th, millimeter wave system
Unite small, light-weight, therefore compared with microwave circuit, millimetre-wave circuit size is much smaller, so that millimeter-wave systems are more easy to
It is integrated.Exactly these unique properties impart the wide application prospect of millimeter-wave technology, especially in Non-Destructive Testing and safety check
Field.
In the mm-wave imaging early stage of development, millimeter wave imaging system all uses single pass mechanical scanning system, it is this into
As institutional structure is simple but sweep time is long.In order to shorten sweep time, Millivision companies have developed Veta125
Imager, the imager is in addition to scanning system is launched, also with 8 × 8 array received mechanism, but this imager more suitable for
Outdoor monitoring long-range on a large scale, and visual field is less than 50 centimetres.Trex companies still further developed a set of PMC-2 imaging systems, this
Antenna element in imaging system employs the technology of 3mm phased array antenna.PMC-2 imaging systems employ centre frequency
The millimeter wave of 84GHz, the working frequency of this imaging system is due to close to Terahertz frequency range, thus cost is higher.Lockheed
Martin companies also have developed a set of focal-plane imaging array imaging system, the centre frequency of its millimeter wave used for
94GHz.TRW Ltd. (US) One Space Park, Redondo Beach CA 90278 U.S.A. have developed a set of passive millimeter wave imaging system, the centre frequency of the millimeter wave that this set system uses for
89GHz.The visual field of the imaging system of this two company of Lockheed Martin and TRW is all smaller, generally also less than 50 centimetres.
At this stage northwest Pacific laboratory is concentrated mainly in mm-wave imaging field, mm-wave imaging achievement in research
(Pacific Northwest National Laboratory).McMakin in this laboratory et al., develops a set of three
Holographic imaging scanning system is tieed up, the scan mechanism of this set imaging system is scanned based on cylinder, and this set system has been carried out
The commercialization of millimeter wave imaging system.The imaging system is obtained using Active Imaging mechanism by Holographic Algorithm inverting
The three-dimensional millimeter-wave image of target.Technique authorized L-3Communications and Save View Co., Ltds, he
The product produced be respectively used in the safe examination system in the places such as station terminal and examination is selected among clothes.But due to this system
System employs 384 Transmit-Receive Units, thus cost is higher.
Also, the mm-wave imaging technology used at present in terms of personnel's safety check is all with radar motion, target hovering
Synthetic aperture radar (SAR) image-forming principle, in safety check, there are the problem of image taking speed is slow, visual field is small.Also, existing peace
In safety check human body, security staff needs on the body of tested personnel to move back and forth using rays safety detection apparatus check system, this for
There is the problem of inconvenient for security staff and tested personnel.
Utility model content
The purpose of this utility model is to provide a kind of millimeter wave real time imagery safety detecting system, to solve existing safety check
There are the problem of image taking speed is slow, visual field is small for the middle mm-wave imaging safety detecting system used.
To achieve the above object, the technical solution adopted in the utility model is：A kind of millimeter wave real time imagery safety is provided
Detecting system, including：Transmission device, transmission device are used to transmit checked object；Millimeter wave transceiving module, millimeter wave transceiving module
The millimeter wave transmitting signal of checked object is sent to for generating and receives and handle echo-signal；Aerial array, aerial array
It is connected with millimeter wave transceiving module, aerial array includes transmitting antenna array and receiving antenna array, and transmitting antenna array includes
Multiple transmitting antennas, receiving antenna array include multiple reception antennas, and each transmitting antenna and each reception antenna correspond, with hair
Send millimeter wave transmitting signal and receives echo-signal；Switch arrays, switch arrays include emission switch array and receive switch arrays
Row, emission switch array are made of multiple emission switch, are received switch arrays and are made of multiple reception switches；Switch control is single
Member, switch control unit include emission switch control unit and receive switch control unit, emission switch control unit and transmitting
Switch arrays are electrically connected, and are received switch control unit and are electrically connected with receiving switch arrays, respectively to be sent out according to default timing control
Penetrate switch and each reception switches on-off；The input of quadrature demodulation and data acquisition module, quadrature demodulation and data acquisition module
End is connected with millimeter wave transceiving module, to be acquired, correct to echo-signal and handle；Image-display units, image display
Unit is connected with the output terminal of quadrature demodulation and data acquisition module, by echo signal form and shows the three-dimensional of checked object
Image.
Further, millimeter wave real time imagery safety detecting system further includes warning device, is adopted with quadrature demodulation and data
Collect module connection, warning device is used to prompt the presence for whetheing there is dangerous goods.
Further, millimeter wave real time imagery safety detecting system further includes door gear, and transmission device passes through door gear, milli
Metric wave transceiver module, aerial array are arranged on door gear.
Further, transmission device includes：Belt, belt pass through door gear, and belt is used to transmit checked object；Motor,
Motor is drivingly connected with belt, is moved with drive belt.
Further, millimeter wave transceiving module includes：Launch link, transmitting link, which is used to generate, is sent to checked object
Millimeter wave launches signal；Receives link, receives link be used for receive checked object return echo-signal, and to echo-signal into
Row is handled to be sent to quadrature demodulation and data acquisition module；Corrective loop, corrective loop are used to correct the defeated of the first oscillation source
Enter the linearity of voltage, and the frequency of millimeter wave transmitting signal is corrected.
Further, transmitting link includes：First oscillation source, the first oscillation source are the pressures being operated in the range of first frequency
Control oscillation source device；First power splitter, the input terminal of the first power splitter are connected with voltage controlled oscillator source device；First power amplifier, the
One power amplifier is connected with the output terminal of the first power splitter, is put with the power for exporting signal all the way to the first power splitter
Greatly to reach the driving power scope of the first varactor doubler；First varactor doubler, the signal two that the first power amplifier is exported
Frequency multiplication is to second frequency scope, and by the signal output after two frequencys multiplication to the first wave filter；First wave filter, to the one or two frequency multiplication
The spurious signal that device produces is suppressed, and by filtered signal output to the second power amplifier；Second power amplifier,
Power amplification is carried out to the signal that the first wave filter exports to reach the driving power scope of the second varactor doubler；Two or two frequency multiplication
Device, by two frequency multiplication of signal of the second power amplifier output to the 3rd frequency range, and by the signal output after two frequencys multiplication to the
Two wave filters；Second wave filter, the spurious signal produced to the second varactor doubler suppress, and by filtered signal output
To the 3rd power amplifier；3rd power amplifier, power amplification, amplified letter are carried out to the signal of the second wave filter output
Number output to the second power splitter input port；Second power splitter, passes through wherein one by the output signal of the 3rd power amplifier
A output port is exported to the 4th power amplifier；4th power amplifier, by one of output port in the second power splitter
Signal output to the local oscillator port of the first orthogonal mixer；First orthogonal mixer, by the emission medium-frequency of emission medium-frequency link
The output signal of signal and the 4th power amplifier carries out orthogonal mixing, and the millimeter-wave signal that radio-frequency head is mixed simultaneously exports extremely
5th power amplifier；5th power amplifier, power amplification and defeated is carried out by the mixed frequency signal of the radio-frequency head of orthogonal mixer
Go out to transmitting antenna.
Further, receives link includes：First low-noise amplifier, the amplification of the first low-noise amplifier is from reception day
The millimeter-wave signal that line receives, and export to the rf inputs mouth of the second orthogonal mixer；Second orthogonal mixer, second just
Hand over local oscillator port second output port of the input from the second power splitter of frequency mixer and through the amplification of the 6th power amplifier
Transmitting signal and the signal from the first low-noise amplifier simultaneously carries out orthogonal mixing and obtains exporting intermediate-freuqncy signal；Export intermediate frequency letter
Number the signal for carrying checked object information is sent into quadrature demodulation and data acquisition module is handled and is analyzed.
Further, corrective loop includes：7th power amplifier, the amplification of the 7th power amplifier come from the first power splitter
In addition export signal all the way, and it is the 4th frequency range to export to the first divider, the first divider reference frequency output；The
One divider will export signal output to the 3rd wave filter and be filtered processing, and by filtered signal output to the second division
Device, the reference frequency output of the second divider is the 5th frequency range；Second divider, by output signal output to the 4th filtering
Device is filtered processing, and filtered signal output to quadrature demodulation and data acquisition module are carried out voltage controlled oscillator source input
The correction of voltage.
Further, first frequency scope is F1~F2, and second frequency scope is 2F1~2F2, and the 3rd frequency range is
4F1~4F2, the 4th frequency range are F1/x~F2/x, and the 5th frequency range is F1/xy~F2/xy, and wherein x, y is greater than 1
Integer.
Further, in quadrature demodulation and data acquisition module, demodulation collection returning from millimeter wave transceiving module
Ripple signal, by echo-signal with locus signal contact together with, then carries out Fourier transformation and inverse Fourier transform is come
Obtain 3-D view.
The beneficial effect of millimeter wave real time imagery safety detecting system provided by the utility model is：
1st, using radar is motionless, Inverse Synthetic Aperture Radar (ISAR) image-forming principle of target movement, moved in checked object
When to its real time imagery, the millimeter wave imaging system used compared to existing safe examination system improves image taking speed.Also, compare
50 centimetres of visual field, Inverse Synthetic Aperture Radar (ISAR) imaging can only be generally obtained less than in synthetic aperture radar (SAR) imaging
Visual field can reach several meters even tens meters, visual field is expanded significantly, so as to expand the observation scope of security staff.
2nd, checked object is moved by transmission device 10, when checked object is behaved, tested personnel in moving process
Generated on image-display units 13 and show 3-D graphic, security staff can be sentenced by observing the graphics of tested personnel's body
Breaking, whether it carries dangerous goods, is moved back and forth so as to eliminate security staff using rays safety detection apparatus on the body of tested personnel
The problem of inconvenience of generation.
3rd, switch arrays are formed by multiple switch, aerial array is formed by mutiple antennas, switch control unit is according to default
Timing control switch arrays so that switch arrays according to the transmitting and reception of each antenna in timing control aerial array, into
And the transmitting antenna that is respectively correspondingly arranged and reception antenna is set to carry out the transmitting of millimeter wave successively according to the movement of checked object
And reception, so as to only need a millimeter wave transceiving module 11 with regard to that can meet to carry out different parts of the checked object in diverse location
Scanning, compared to it is existing need to be correspondingly arranged for the imaging system of a signal transmitting and receiving module to each pair antenna reduce letter
The quantity of number transceiver module, so as to reduce use cost.
Brief description of the drawings
, below will be to embodiment or the prior art in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Attached drawing is briefly described needed in description, it should be apparent that, drawings in the following description are only that this practicality is new
Some embodiments of type, for those of ordinary skill in the art, without having to pay creative labor, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the composition frame chart for the millimeter wave real time imagery safety detecting system that the utility model embodiment provides；
Fig. 2 is the structure diagram for the millimeter wave real time imagery safety detecting system that the utility model embodiment provides；
Fig. 3 is the millimeter wave transceiving mould in the millimeter wave real time imagery safety detecting system that the utility model embodiment provides
The circuit diagram of block；
Fig. 4 is the flow chart for the millimeter wave real time imagery safety detection method that the utility model embodiment provides.
Wherein, each reference numeral in figure：
10th, transmission device；11st, millimeter wave transceiving module；12nd, quadrature demodulation and data acquisition module；13rd, image display list
Member；14th, warning device；15a, emission switch control unit；15b, receive switch control unit；16a, emission switch array；
16b, receive switch arrays；17th, transmitting antenna array；18th, receiving antenna array；19th, door gear；23rd, belt；24th, motor；
301st, the first oscillation source；302nd, the first power splitter；303rd, the first power amplifier；304th, the first varactor doubler；305th, the first filter
Ripple device；306th, the second power amplifier；307th, the second varactor doubler；308th, the second wave filter；309th, the 3rd power amplifier；
310th, the second power splitter；311st, the 4th power amplifier；312nd, the first orthogonal mixer；313rd, the 5th power amplifier；314、
First low-noise amplifier；315th, the second orthogonal mixer；316th, the 6th power amplifier；317th, the 7th power amplifier；
318th, the first divider；319th, the 3rd wave filter；320th, the second divider；321st, the 4th wave filter.
Embodiment
In order to which technical problem to be solved in the utility model, technical solution and beneficial effect is more clearly understood, with
Lower combination accompanying drawings and embodiments, are further elaborated the utility model.It is it should be appreciated that described herein specific real
Example is applied only to explain the utility model, is not used to limit the utility model.
It should be noted that when element is referred to as " being fixed on " or " being arranged at " another element, it can be directly another
On one element or it is connected on another element.When an element is known as " being connected to " another element, it can
To be directly to another element or be indirectly connected on another element.
It is to be appreciated that term " length ", " width ", " on ", " under ", "front", "rear", "left", "right", " vertical ",
The orientation or position relationship of the instruction such as " level ", " top ", " bottom ", " interior ", " outer " are to be closed based on orientation shown in the drawings or position
System, is for only for ease of and describes the utility model and simplified description, rather than the device or element of instruction or hint meaning are necessary
With specific orientation, with specific azimuth configuration and operation, therefore it is not intended that limitation to the utility model.
In addition, term " first ", " second " are only used for description purpose, and it is not intended that instruction or hint relative importance
Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can be expressed or
Implicitly include one or more this feature.In the description of the utility model, " multiple " are meant that two or two
More than, unless otherwise specifically defined.
In order to solve the mm-wave imaging safety detecting system that is used in existing safety check, there are image taking speed is slow, visual field is small
Problem, the utility model provide a kind of millimeter wave real time imagery safety detecting system and safety detection method.
As depicted in figs. 1 and 2, millimeter wave real time imagery safety detecting system includes：Transmission device 10, transmission device 10 are used
In transmission checked object；Millimeter wave transceiving module 11, millimeter wave transceiving module 11 are used to generate the millimeter for being sent to checked object
Ripple launches signal and receives and handle echo-signal；Aerial array, aerial array are connected with millimeter wave transceiving module 11, antenna array
Row include transmitting antenna array 17 and receiving antenna array 18, and transmitting antenna array 17 includes multiple transmitting antennas, reception antenna
Array 18 includes multiple reception antennas, and each transmitting antenna and each reception antenna correspond, with send millimeter wave transmitting signal and
Receives echo-signal；Switch arrays, switch arrays include emission switch array 16a and receive switch arrays 16b, emission switch battle array
Row 16a is made of multiple emission switch, is received switch arrays 16b and is made of multiple reception switches；Switch control unit, switch control
Unit processed includes emission switch control unit 15a and receives switch control unit 15b, emission switch control unit 15a and transmitting
Switch arrays 16a is electrically connected, and is received switch control unit 15b and is electrically connected with receiving switch arrays 16b, with according to default sequential
Each emission switch and each reception is controlled to switch on-off；Quadrature demodulation and data acquisition module 12, quadrature demodulation and data acquisition
The input terminal of module 12 is connected with millimeter wave transceiving module 11, to be acquired, correct to echo-signal and handle；Image display
Unit 13, image-display units 13 are connected with the output terminal of quadrature demodulation and data acquisition module 12, by echo signal form
And show the 3-D view of checked object.
Referring to Fig. 4, when detecting checked object using the millimeter wave real time imagery safety detecting system, comprise the following steps：
S1：Transmission device 10 moves checked object；S2：Millimeter wave transceiving module 11 generates millimeter wave transmitting signal；S3：Switch control is single
First controlling switch array；S4：Switch arrays are according to the transmitting and reception of timing control aerial array, so that the hair being respectively correspondingly arranged
Penetrate transmitting and reception that antenna and reception antenna carry out millimeter wave successively；Wherein, transmitting antenna gives birth to millimeter wave transceiving module 11
Into millimeter wave transmitting signal be transmitted to checked object, reception antenna, which receives the echo-signal that checked object returns, simultaneously believes echo
Number it is sent to millimeter wave transceiving module 11；S5：Millimeter wave transceiving module 11 handles echo-signal and is sent to orthogonal solution
Reconciled data acquisition module 12；S6：Quadrature demodulation and data acquisition module 12 to the signal from millimeter wave transceiving module 11 into
Row collection, correction and processing；S7：Signal after processing generates in image-display units 13 and shows the graphics of checked object
Picture.
The millimeter wave real time imagery safety detecting system is using radar is motionless, the Inverse Synthetic Aperture Radar of target movement
(ISAR) image-forming principle, is imaged moving target by static radar, mobile target can be carried out in real time accurately into
Picture, therefore, during safety check, checked object is moved by transmission device 10, checked object in moving process, receive by millimeter wave
Hair module 11 firstly generates the transmitting emitted antenna of signal and is sent to checked object, and checked object returns to the echo with its information
Signal to reception antenna, reception antenna receive echo-signal be sent to successively again millimeter wave transceiving module 11 and quadrature demodulation and
Data acquisition module 12, the echo-signal with checked object information are gathered through quadrature demodulation and data acquisition module 12, corrected
With image-display units 13 are sent to after processing, in image-display units 13 generate and show checked object graphics
Picture.Security staff just may know that whether checked object keeps dangerous goods by observing the 3-D view of checked object.This milli
There are advantages below for metric wave real time imagery safety detecting system：
1st, using radar is motionless, Inverse Synthetic Aperture Radar (ISAR) image-forming principle of target movement, moved in checked object
When to its real time imagery, the millimeter wave imaging system used compared to existing safe examination system improves image taking speed.Also, compare
50 centimetres of visual field, Inverse Synthetic Aperture Radar (ISAR) imaging can only be generally obtained less than in synthetic aperture radar (SAR) imaging
Visual field can reach several meters even tens meters, visual field is expanded significantly, so as to expand the observation scope of security staff.
2nd, checked object is moved by transmission device 10, when checked object is behaved, tested personnel in moving process
Generated on image-display units 13 and show 3-D graphic, security staff can be sentenced by observing the graphics of tested personnel's body
Breaking, whether it carries dangerous goods, is moved back and forth so as to eliminate security staff using rays safety detection apparatus on the body of tested personnel
The problem of inconvenience of generation.
3rd, switch arrays are formed by multiple switch, aerial array is formed by mutiple antennas, switch control unit is according to default
Timing control switch arrays so that switch arrays according to the transmitting and reception of each antenna in timing control aerial array, into
And the transmitting antenna that is respectively correspondingly arranged and reception antenna is set to carry out the transmitting of millimeter wave successively according to the movement of checked object
And reception, so as to only need a millimeter wave transceiving module 11 with regard to that can meet to carry out different parts of the checked object in diverse location
Scanning, compared to it is existing need to be correspondingly arranged for the imaging system of a signal transmitting and receiving module to each pair antenna reduce letter
The quantity of number transceiver module, so as to reduce use cost.
Optionally, in order to save manpower, millimeter wave real time imagery safety detecting system further includes warning device 14, alarm dress
Put 14 to be connected with quadrature demodulation and data acquisition module 12, when safety detection further includes S8：Shown when image-display units 13
In 3-D view during the information of dangerous article, warning device 14 sends alarm signal, reminds security staff to have for prompting
The presence of dangerous goods.Optionally, warning device 14 can be buzzer.
Referring to Fig. 2, millimeter wave real time imagery safety detecting system further includes door gear 19, and transmission device 10 passes through door gear
19, millimeter wave transceiving module 11, aerial array are arranged on door gear 19.Transmission device 10 includes：Belt 23, belt 23 are worn
Door gear 19 is crossed, belt 23 is used to transmit checked object；Motor 24, motor 24 are drivingly connected with belt 23, with drive belt 23
Movement.
Specifically, N number of transmitting antenna is fixed with every side door device 19 and forms a row transmitting antenna array 17 and N
A reception antenna forms a row receiving antenna array 18, on rear side of aerial array equipped with switch arrays, switch control unit and
Quadrature demodulation and data acquisition unit 12, image-display units 13 and warning device 14 are equipped with 19 side of door gear.Wherein N
It is greater than the integer equal to 2.
In addition, the hair of multiple millimeter-wave signal is carried out according to the N number of millimeter wave transmitting antenna of timing control and N number of reception antenna
Penetrate and receive, so as to complete the collection of the echo-signal of the front-back to mobile checked object.For example, N number of millimeter wave is sent out
Penetrating the control of antenna can be realized by single pole multiple throw, naturally it is also possible to use any sequential control known in the art
System.
It is also important to note that the quantity of transmitting antenna and corresponding reception antenna can according to the height of door gear 19 and
The parameters such as the image taking speed to be realized are set, and the height of door gear 19 can be according to the height of checked object come really
It is fixed.In addition, horizontal distance between the side wall of door gear 19 and the footprint of tested personnel can according to the indexs such as antenna parameter come
Determine.Therefore the setting of above mentioned size is it will become apparent to those skilled in the art that no longer carry out detailed
Description.
For example, millimeter wave transceiving module 11 can give four throw switch of hilted broadsword to input millimeter-wave signal, and this
Four throw switch of hilted broadsword can give four four throw switches of hilted broadsword to input millimeter-wave signals again, and this four four throw switches of hilted broadsword can be with
Millimeter-wave signal is inputted to 16 four throw switches of hilted broadsword, can thus there are 64 transmitting antennas, so as to form launching antenna array
Row 17, for the millimeter-wave signal of transmitting to be transmitted at the diverse location of human body.As described above, this 64 transmitting antennas are not
Work at the same time, but for example controlled by three layers of four throw switch of hilted broadsword, them is one by one launched, naturally it is also possible to adopt
Thrown with hilted broadsword five or other single pole multiple throws carry out transmitting antenna and the quantity of reception antenna controls.
In the present embodiment, millimeter wave transceiving module 11 includes transmitting link, receives link and corrective loop.Wherein, send out
Penetrate link be used for generate be sent to checked object millimeter wave transmitting signal；Receives link is used to receive returning for checked object return
Ripple signal, and echo-signal is handled to be sent to quadrature demodulation and data acquisition module 12；Corrective loop is used to correct
The linearity of the input voltage of first oscillation source, and the frequency of millimeter wave transmitting signal is corrected.
Further, as shown in figure 3, transmitting link include sequentially connected first oscillation source 301, the first power splitter 302,
First power amplifier 303, the first varactor doubler 304, the first wave filter 305, the second power amplifier 306, the two or two frequency multiplication
Device 307, the second wave filter 308, the 3rd power amplifier 309, the second power splitter 310, the 4th power amplifier 311, first are just
Hand over 312 and the 5th power amplifier 313 of frequency mixer.Wherein, the first oscillation source 301 be operated in it is voltage-controlled in the range of first frequency
Oscillation source device；First power amplifier 303 is amplified to reach the power for exporting signal all the way of first power splitter 302
The driving power scope of one varactor doubler 304；Two times of the signal that first varactor doubler 304 exports the first power amplifier 303
Frequency is to second frequency scope, and by the signal output after two frequencys multiplication to the first wave filter 305；First wave filter 305 is to the one or two
The spurious signal that frequency multiplier 304 produces is suppressed, and by filtered signal output to the second power amplifier 306；Second
The signal that power amplifier 306 exports the first wave filter 305 carries out power amplification to reach the driving of the second varactor doubler 307
Power bracket；Two frequency multiplication of signal that second varactor doubler 307 exports the second power amplifier 306 to the 3rd frequency range, and
By the signal output after two frequencys multiplication to the second wave filter 308；Second wave filter 308 produces the second varactor doubler 307 spuious
Signal is suppressed, and by filtered signal output to the 3rd power amplifier 309；3rd power amplifier 309 is to second
The signal that wave filter 308 exports carries out power amplification, the input port of amplified signal output to the second power splitter 310；The
Two power splitters 310, which export the output signal of the 3rd power amplifier 309 to the 4th power by one of output port, to be put
Big device 311；4th power amplifier 311 by the signal output of one of output port in the second power splitter 310 to first just
Hand over the local oscillator port of frequency mixer 312；First orthogonal mixer 312 is by the emission medium-frequency signal and the 4th power of emission medium-frequency link
The orthogonal mixing of output signal progress of amplifier 311, the millimeter-wave signal and output to the 5th power that radio-frequency head is mixed are put
Big device 313；The mixed frequency signal of the radio-frequency head of first orthogonal mixer 312 is carried out power amplification simultaneously by the 5th power amplifier 313
Export to transmitting antenna.
By two frequency multiplication of multistage to launching signal, multistage amplification and multiple-stage filtering, the frequency for launching signal is improved
And power.
Further, receives link includes the first low-noise amplifier 314 and the second orthogonal mixer 315 being connected.
First low-noise amplifier 314 amplifies the millimeter-wave signal received from reception antenna, and exports to the second orthogonal mixer 315
Rf inputs mouth；Second output terminal of the local oscillator port input from the second power splitter 310 of second orthogonal mixer 315
Mouth and the transmitting signal through the amplification of the 6th power amplifier 316 and the signal from the first low-noise amplifier 314 simultaneously carry out just
Mixing is handed over to obtain output intermediate-freuqncy signal.The signal for carrying checked object information is sent into quadrature demodulation sum number by output intermediate-freuqncy signal
Handled and analyzed according to acquisition module 12.
Yet further, corrective loop includes the 7th power amplifier 317, the first divider 318 and the second divider
320.Wherein, in addition the 7th power amplifier 317 amplifies exports signal all the way from the first power splitter 302, and export to the
One divider 318,318 reference frequency output of the first divider are the 4th frequency ranges；It is defeated that first divider 318 will export signal
Go out to the 3rd wave filter 319 and be filtered processing, and by filtered signal output to the second divider 320, the second divider
320 reference frequency output is the 5th frequency range；Second divider 320 will output signal output to the 4th wave filter 321 into
Row filtering process, and filtered signal output to quadrature demodulation and data acquisition module 12 are subjected to voltage controlled oscillator source input electricity
The correction of pressure.
In the present embodiment, first frequency scope is F1~F2, and second frequency scope is 2F1~2F2, the 3rd frequency range
For 4F1~4F2, the 4th frequency range is F1/x~F2/x, and the 5th frequency range is F1/xy~F2/xy, and wherein x, y is greater than 1
Integer, concrete numerical value according to the disposal ability of data acquisition unit select.
Further, in quadrature demodulation and data acquisition module 12, demodulation collection comes from millimeter wave transceiving module 11
Echo-signal, by echo-signal with locus signal contact together with, then carry out Fourier transformation and Fourier's inversion
Bring to obtain 3-D view.
The utility model is by using above-mentioned millimeter wave real time imagery safety detecting system, with existing mm-wave imaging instrument
Device is compared, and is had the advantages that following prominent：
(1) it is cheap：The utility model makes conveyor-belt apparatus realize the scanning effect of face array using motor, greatly
Reduce cost.
(2) it is simple in structure, it is easy of integration：The utility model is using multiple single pole multiple throws control millimeter wave transceiving antenna
Job order, and building for system is carried out using frequency modulation signal source and millimetric wave device, the complexity of system is greatly reduced,
The integrated level of system is also improved at the same time.
(3) high resolution：The utility model uses CW with frequency modulation technology, super-heterodyne technique and inverse synthetic aperture imaging
Technology, improves the resolution ratio of 3-D view plane and depth.
(4) imaging time is fast：The utility model using conveyer belt transmission checked object march forward direction movement, from door gear
Side be moved to opposite side and can be implemented as picture, saved user time while also substantially increased image taking speed.
(5) visual field increase：Compared with existing less than 50 centimetres of visual field, the embodiment of the utility model can reach several
Rice, or even tens meters of visual field.
(6) signal-to-noise ratio is high：System is imaged using active millimeter wave, by the output power for controlling each millimetric wave device
Scope improves the transmission power of antenna, and certainly, transmission power is within safe radiation scope so that echo-signal signal-to-noise ratio is remote
Far above the signal-to-noise ratio that passive millimeter wave imaging system receives signal, and then obtain the image quality of higher.
(7) it is widely used：Using mm-wave imaging technology high-resolution and advantages of simple structure and simple, can carry out all kinds of big
The detection of type instrument outer layer damage, is also applied for the detection of contraband.
The above is only the preferred embodiments of the present utility model only, is not intended to limit the utility model, all in this practicality
All any modification, equivalent and improvement made within new spirit and principle etc., should be included in the guarantor of the utility model
Within the scope of shield.
Claims (10)
- A kind of 1. millimeter wave real time imagery safety detecting system, it is characterised in that including：Transmission device, the transmission device are used to transmit checked object；Millimeter wave transceiving module, the millimeter wave transceiving module are used to generate the millimeter wave transmitting letter for being sent to the checked object Number and receive and processing echo-signal；Aerial array, the aerial array are connected with the millimeter wave transceiving module, and the aerial array includes launching antenna array Row and receiving antenna array, the transmitting antenna array include multiple transmitting antennas, and the receiving antenna array includes multiple connect Antenna is received, each transmitting antenna and each reception antenna correspond, to send the millimeter wave transmitting signal and reception The echo-signal；Switch arrays, the switch arrays include emission switch array and receive switch arrays, and the emission switch array is by more A emission switch composition, the reception switch arrays are made of multiple reception switches；Switch control unit, the switch control unit includes emission switch control unit and receives switch control unit, described Emission switch control unit is electrically connected with the emission switch array, the reception switch control unit and the reception switch arrays Row are electrically connected, to be switched on-off according to each emission switch of default timing control and each reception；The input terminal of quadrature demodulation and data acquisition module, the quadrature demodulation and data acquisition module and the millimeter wave transceiving Module connects, the echo-signal is acquired, corrects and be handled；Image-display units, described image display unit are connected with the output terminal of the quadrature demodulation and data acquisition module, with By the echo signal form and show the 3-D view of the checked object.
- 2. millimeter wave real time imagery safety detecting system as claimed in claim 1, it is characterised in that the millimeter wave in real time into As safety detecting system further includes warning device, it is connected with the quadrature demodulation and data acquisition module, the warning device is used The presence of dangerous goods is whether there is in prompting.
- 3. millimeter wave real time imagery safety detecting system as claimed in claim 1, it is characterised in that the millimeter wave in real time into As safety detecting system further includes door gear, the transmission device passes through the door gear, the millimeter wave transceiving module, described Aerial array is arranged on the door gear.
- 4. millimeter wave real time imagery safety detecting system as claimed in claim 3, it is characterised in that the transmission device bag Include：Belt, the belt pass through the door gear, and the belt is used to transmit the checked object；Motor, the motor is drivingly connected with the belt, to drive the belt movement.
- 5. millimeter wave real time imagery safety detecting system as claimed in claim 1, it is characterised in that the millimeter wave transceiving mould Block includes：Launch link, the transmitting link is used to generate the millimeter wave transmitting signal for being sent to the checked object；Receives link, the receives link is used for the echo-signal for receiving checked object return, and the echo-signal is carried out Handle to be sent to the quadrature demodulation and data acquisition module；Corrective loop, the corrective loop are used for the linearity for correcting the input voltage of the first oscillation source, and to the millimeter wave The frequency of transmitting signal is corrected.
- 6. millimeter wave real time imagery safety detecting system as claimed in claim 5, it is characterised in that the transmitting link bag Include：First oscillation source, first oscillation source are the voltage controlled oscillator source devices being operated in the range of first frequency；First power splitter, the input terminal of first power splitter are connected with the voltage controlled oscillator source device；First power amplifier, first power amplifier are connected with the output terminal of first power splitter, with to described The power for exporting signal all the way of one power splitter is amplified to reach the driving power scope of the first varactor doubler；First varactor doubler, by two frequency multiplication of signal of first power amplifier output to second frequency scope, and will Signal output after two frequencys multiplication is to the first wave filter；First wave filter, the spurious signal produced to first varactor doubler suppress, and by filtered signal Export to the second power amplifier；Second power amplifier, carries out power amplification to reach the two or two frequency multiplication to the signal that first wave filter exports The driving power scope of device；Second varactor doubler, by two frequency multiplication of signal of second power amplifier output to the 3rd frequency range, and will Signal output after two frequencys multiplication is to the second wave filter；Second wave filter, the spurious signal produced to second varactor doubler suppress, and by filtered signal Export to the 3rd power amplifier；3rd power amplifier, carries out power amplification, amplified signal is defeated to the signal of second wave filter output Go out to the input port of the second power splitter；Second power splitter, the output signal of the 3rd power amplifier is exported to by one of output port Four power amplifiers；4th power amplifier, by the signal output of one of output port in second power splitter to first orthogonal The local oscillator port of frequency mixer；First orthogonal mixer, by the output of the emission medium-frequency signal of emission medium-frequency link and the 4th power amplifier Signal carries out orthogonal mixing, and the millimeter-wave signal that radio-frequency head is mixed simultaneously is exported to the 5th power amplifier；5th power amplifier, carries out power amplification by the mixed frequency signal of the radio-frequency head of the orthogonal mixer and exports extremely The transmitting antenna.
- 7. millimeter wave real time imagery safety detecting system as claimed in claim 6, it is characterised in that the receives link bag Include：First low-noise amplifier, the millimeter wave letter that the first low-noise amplifier amplification is received from the reception antenna Number, and export to the rf inputs mouth of the second orthogonal mixer；Second orthogonal mixer, the local oscillator port of second orthogonal mixer input the from second power splitter Two output ports and the transmitting signal through the amplification of the 6th power amplifier and the signal from first low-noise amplifier And carry out orthogonal mixing and obtain output intermediate-freuqncy signal；The signal for carrying checked object information is sent into the quadrature demodulation and data acquisition module by the output intermediate-freuqncy signal Handled and analyzed.
- 8. millimeter wave real time imagery safety detecting system as claimed in claim 6, it is characterised in that the corrective loop bag Include：In addition 7th power amplifier, the 7th power amplifier amplification export letter all the way from first power splitter Number, and it is the 4th frequency range to export to the first divider, the first divider reference frequency output；First divider, processing is filtered by output signal output to the 3rd wave filter, and filtered signal is defeated Go out to the second divider, the reference frequency output of second divider is the 5th frequency range；Second divider, processing is filtered by output signal output to the 4th wave filter, and filtered signal is defeated Go out to quadrature demodulation and data acquisition module to carry out the correction of the voltage controlled oscillator source input voltage.
- 9. millimeter wave real time imagery safety detecting system as claimed in claim 8, it is characterised in that the first frequency scope For F1~F2, the second frequency scope is 2F1~2F2, and the 3rd frequency range is 4F1~4F2, the 4th frequency model It is F1/xy~F2/xy to enclose for F1/x~F2/x, the 5th frequency range, and wherein x, y is greater than 1 integer.
- 10. millimeter wave real time imagery safety detecting system as claimed in claim 1, it is characterised in that in the quadrature demodulation In data acquisition module, demodulation collection the echo-signal from the millimeter wave transceiving module, by the echo-signal with Then locus signal contact carries out Fourier transformation and inverse Fourier transform to obtain the 3-D view to together.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720945704.5U CN207352187U (en) | 2017-07-31 | 2017-07-31 | Millimeter wave real time imagery safety detecting system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720945704.5U CN207352187U (en) | 2017-07-31 | 2017-07-31 | Millimeter wave real time imagery safety detecting system |
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| CN207352187U true CN207352187U (en) | 2018-05-11 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107238868A (en) * | 2017-07-31 | 2017-10-10 | 深圳市无牙太赫兹科技有限公司 | Millimeter wave real time imagery safety detecting system and safety detection method |
| CN110515133A (en) * | 2019-08-13 | 2019-11-29 | 博微太赫兹信息科技有限公司 | A kind of quick millimeter wave human body imaging detector gate |
| CN111541048A (en) * | 2020-04-29 | 2020-08-14 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Terahertz active phased array antenna |
| CN112415624A (en) * | 2020-11-25 | 2021-02-26 | 成都菲斯洛克电子技术有限公司 | Security detection system and detection method |
| CN112634566A (en) * | 2020-12-16 | 2021-04-09 | 路晟悠拜(重庆)科技有限公司 | Intelligent electronic fence construction method and system based on millimeter waves |
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2017
- 2017-07-31 CN CN201720945704.5U patent/CN207352187U/en not_active Withdrawn - After Issue
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107238868A (en) * | 2017-07-31 | 2017-10-10 | 深圳市无牙太赫兹科技有限公司 | Millimeter wave real time imagery safety detecting system and safety detection method |
| CN110515133A (en) * | 2019-08-13 | 2019-11-29 | 博微太赫兹信息科技有限公司 | A kind of quick millimeter wave human body imaging detector gate |
| CN111541048A (en) * | 2020-04-29 | 2020-08-14 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Terahertz active phased array antenna |
| CN111541048B (en) * | 2020-04-29 | 2021-06-15 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Terahertz active phased array antenna |
| CN112415624A (en) * | 2020-11-25 | 2021-02-26 | 成都菲斯洛克电子技术有限公司 | Security detection system and detection method |
| CN112415624B (en) * | 2020-11-25 | 2023-08-25 | 成都菲斯洛克电子技术有限公司 | Security protection detection system and detection method |
| CN112634566A (en) * | 2020-12-16 | 2021-04-09 | 路晟悠拜(重庆)科技有限公司 | Intelligent electronic fence construction method and system based on millimeter waves |
| CN112634566B (en) * | 2020-12-16 | 2022-08-16 | 路晟悠拜(重庆)科技有限公司 | Intelligent electronic fence construction method and system based on millimeter waves |
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