CN105607056A - Human body security check system and method - Google Patents
Human body security check system and method Download PDFInfo
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- CN105607056A CN105607056A CN201610046077.1A CN201610046077A CN105607056A CN 105607056 A CN105607056 A CN 105607056A CN 201610046077 A CN201610046077 A CN 201610046077A CN 105607056 A CN105607056 A CN 105607056A
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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
- G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
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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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- Radar, Positioning & Navigation (AREA)
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- Radar Systems Or Details Thereof (AREA)
Abstract
The invention provides a human body security check system. The system comprises an emission antenna used for sending millimeter wave emission signals to a detected human body; a receiving antenna used for receiving echo signals returned from the detected human body; a millimeter wave transceiving module used for generating the millimeter wave emission signals sent to the detected human body and receiving and processing the echo signals from the receiving antenna; a scanning apparatus used for fixing and moving the millimeter wave transceiving module, the emission antenna and the receiving antenna; a data acquisition and processing module used for acquiring and processing the echo signals output from the millimeter wave transceiving module so as to generate a three-dimensional image of the detected human body; and an image display unit used for displaying the three-dimensional image generated by the data acquisition and processing module. Besides, the invention also provides a human body security check method using the human body security check system. The method and system provided by the technical scheme have the advantages of simple structure, high resolution, short imaging time, quite large view field and the like.
Description
Technical field
The present invention relates to the milli based on linear frequency modulation technology, superhet detection principle and holographic imaging principleMetric wave 3-D imaging system, particularly, relates to human body security check system and method.
Background technology
Millimeter wave frequency is that 30GHz is to 300GHz (wavelength is from 1mm to 10mm), in actual workIn Cheng Yingyong, often the low side frequency of millimeter wave is dropped to 26GHz. In electromagnetic spectrum, millimeter wave frequentlyThe position of rate between microwave and infrared between. Compared with microwave, the typical feature of millimeter wave be wavelength short,Bandwidth (thering is the very wide space that utilizes) and the propagation characteristic in atmosphere. Compared with infrared,Millimeter wave has the ability of all weather operations and can be used for flue dust, under the adverse circumstances such as cloud and mist. Micro-In the more and more crowded situation of ripple frequency range, millimeter wave is taken into account the advantage of microwave, and possesses low-frequency rangeThe more not available advantages of microwave.
Specifically, millimeter wave mainly contains following feature: 1, precision is high, and millimetre-wave radar more holdsEasily obtain narrow wave beam and large absolute bandwidth, make the anti-electronic interferences ability of millimetre-wave radar system moreBy force; 2,, in Doppler radar, the Doppler frequency resolution ratio of millimeter wave is high; 3, become at millimeter waveIn picture system, the shape and structure sensitivity of millimeter wave to target, the energy of difference metal target and background environmentPower is strong, and the image resolution ratio of acquisition is high, therefore can improve target identification and detectivity 4, millimeter waveCan penetrate plasma; 5,, compared with infrared laser, millimeter wave is subject to the impact of extreme natural environment little;6, millimeter-wave systems volume is little, lightweight, and therefore, compared with microwave circuit, millimetre-wave circuit size is wantedLittle a lot, thus millimeter-wave systems is more easy of integration. These unique character have been given millimeter wave skill justThe wide application prospect of art, 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 bodySystem, this imaging system is simple in structure but sweep time is long. In order to shorten sweep time,Millivision company has developed Veta125 imager, this imager except emission scan system, also toolHave 8 × 8 array received mechanism, but this imager is more suitable in outdoor large-scale remote monitoring,And visual field is less than 50 centimetres. Trex company has also developed a set of PMC-2 imaging system, this imagingAntenna element in system has adopted the technology of 3mm phased array antenna. PMC-2 imaging system adoptsThe centre frequency millimeter wave that is 84GHz, the operating frequency of this imaging system is owing to approaching TerahertzFrequency range, thereby cost is higher. LockheedMartin company has also developed a set of focal-plane imaging arrayImaging system, the centre frequency of its millimeter wave adopting is 94GHz. TRW Ltd. (US) One Space Park, Redondo Beach CA 90278 U.S.A. has developed a set of quiltMoving millimeter wave imaging system, the centre frequency of the millimeter wave that this cover system adopts is 89GHz.The visual field of the imaging system of LockheedMartin and TRW Zhe Liang company is all less, conventionally also less than50 centimetres.
Present stage, mm-wave imaging achievement in research mainly concentrated on northwest peace in mm-wave imaging fieldLaboratory, ocean (PacificNorthwestNationalLaboratory). McMakin in this laboratoryDeng people, develop a set of 3D hologram image scanning system, the scan mechanism of this cover imaging system is baseIn cylinder scanning, and this cover system has been realized the commercialization of millimeter wave imaging system. This imagingWhat system adopted is Active Imaging mechanism, obtains the three-dimensional millimeter wave figure of target by Holographic Algorithm invertingPicture. Technique has been authorized L-3Communications and SaveView Co., Ltd, theyThe product of producing is respectively used in the safe examination system in the places such as station terminal and examination is selected among clothes. ButBe because this system has adopted 384 Transmit-Receive Units, thereby cost cannot lower all the time. At presentThe developing of millimeter wave imaging system of higher frequency is just being devoted in northwest Pacific laboratory.
Except the laboratory of introducing and company, in the country such as Britain, the U.S., also there is a lot of sections aboveThe research of mm-wave imaging technology of having ground institutes and enterprise participation, as naval of the ground force air research of the U.S.Company and the Delaware such as laboratory and naval's coastal base, the universities such as Arizona, BritainReading university, Durham university and Farran company etc.
Except Great Britain and America state, microwave and the Radar Research Establishment (MicrowaveandRadar of GermanyInstitute) also there is the millimeter wave of participation to become with German Aviation Center (GermanAerospaceCenter)The research of picture technology. Australia ICT center, there is relevant millimeter wave in the NEC Corporation of Japan etc.The report of imaging research achievement. But, the millimeter wave of these units research or in laboratory stage,The product price of developing is very high, or the visual field of detecting is less.
Therefore, need a kind of price millimeter wave three-dimensional imaging detection system low, that visual field is large to realize rightThe safety detection of human body.
Summary of the invention
The object of the present invention is to provide a kind of simple in structure, resolution ratio is high, imaging time is short human bodySafe examination system.
According to an aspect of the present invention, provide a kind of human body security check system, having comprised: transmitting antenna,Transmit for sending millimeter wave to tested human body; Reception antenna, returns from tested human body for receivingThe echo-signal of returning; Millimeter wave transceiving module, for generating the millimeter wave transmitting that sends to tested human bodySignal also receives and processes the echo-signal from reception antenna; Scanning means, for fixing and movingMillimeter wave transceiving module, transmitting antenna and reception antenna; Data acquisition and processing (DAP) module, for gatheringWith process from the echo-signal of millimeter wave transceiving module output to generate the 3-D view of tested human body; WithAnd image-display units, for showing the 3-D view being generated by data acquisition and processing (DAP) module.
Further, scanning means comprises: two planes detect panel, for supporting millimeter wave transceivingModule, transmitting antenna and reception antenna, tested human body is placed in two planes and detects between panel; Two pairsGuide rail, is separately positioned on every plane and detects the both sides of panel, millimeter wave transceiving module, transmitting antennaMove up and down along guide rail with reception antenna; And motor, for controlling millimeter wave transceiving module, transmittingAntenna and reception antenna move up and down along guide rail.
Further, on every plane detection panel, individual of N millimeter wave transceiving module, N is setPenetrate an antenna and N reception antenna, the corresponding transmitting antenna of each millimeter wave transceiving module and oneReception antenna, N millimeter wave transceiving module is arranged side by side with shape millimeter wave transceiving system in a row, NIndividual transmitting antenna is arranged side by side to form transmitting antenna array, and N reception antenna be arranged side by side withFormation receiving antenna array wherein N is more than or equal to 2 integer.
Further, N millimeter wave transceiving module carried out the transmitting of millimeter wave one by one according to SECOAnd reception.
Further, millimeter wave transceiving module comprises: transmitting chain, sends to tested person for generatingThe millimeter wave of body transmits; And receiver, the echo-signal of returning for receiving tested human bodyAnd echo-signal is processed to send to data acquisition and processing (DAP) module.
Further, transmitting chain comprises: first signal source, first signal source is to be operated in first frequentlyFrequency modulation signal source within the scope of rate; The first directional coupler, the input of the first directional coupler connectsTo first signal source, straight-through end is connected to the first power amplifier; The first power amplifier, to firstThe power of the output signal of directional coupler amplifies to reach the safe input work of the first varactor doublerRate scope; And first varactor doubler, by signal two frequencys multiplication to the second of the first power amplifier outputFrequency range, and export the signal after two frequencys multiplication to transmitting antenna.
Further, receiver comprises: secondary signal source, secondary signal source is to be operated in first frequentlyThe point-frequency signal source of rate; The second directional coupler, the input of the first directional coupler is connected to secondSignal source; The first frequency mixer, the intermediate frequency end of the first frequency mixer is connected to the straight-through of the second directional couplerEnd, radio-frequency head is connected to the coupled end of the first directional coupler, to produce first signal source and the second letterThe difference frequency signal in number source; The second power amplifier, the input of the second power amplifier is connected to firstThe local oscillator end of frequency mixer to be to receive difference frequency signal, and the power of difference frequency signal is amplified to reach theThe safe input power range of two varactor doublers; The second varactor doubler, the input of the second varactor doublerBe connected to the output of the second power amplifier, the output signal of the second power amplifier is carried out to two frequencys multiplicationTo second frequency; The second frequency mixer, the local oscillator end of the second frequency mixer is connected to the defeated of the second varactor doublerGo out end, the echo-signal that radio-frequency head reception reception antenna receives is to generate down-conversion signal first; TheThree power amplifiers, the input of the 3rd power amplifier is connected to the coupled end of the second directional coupler,Signal from the second directional coupler is carried out to power amplification; The 3rd varactor doubler, the three or two frequency multiplicationThe input of device is connected to the output of the 3rd power amplifier, to the letter from the 3rd power amplifierNumber carrying out two frequencys multiplication is operated to second frequency; Three-mixer, the local oscillator end of three-mixer is connected toThe output of the 3rd varactor doubler, radio-frequency head is connected to the intermediate frequency end of the second frequency mixer to generate under secondaryFrequency variation signal; And low-noise amplifier, the input of low-noise amplifier is connected to three-mixerIntermediate frequency end, the secondary down-conversion signal receiving is amplified and exports data acquisition and processing (DAP) toModule.
Further, first frequency scope is 13.5GHz-16.5GHz, and second frequency scope is27GHz-33GHz, first frequency is 35MHz, and second frequency is 70MHz.
Further, in data acquisition and processing (DAP) module, gather returning from millimeter wave transceiving moduleRipple signal, by echo-signal and locus signal contact to together with, then carry out Fourier transformation andInverse Fourier transform obtains 3-D view.
According to a further aspect in the invention, provide a kind of people who utilizes above-mentioned human body security check system to carry outBody safety inspection method, comprises the following steps: scanning means move millimeter wave transceiving module, transmitting antenna andReception antenna scans tested human body; Millimeter wave transceiving module generates millimeter wave and transmits; Transmitting dayThe millimeter wave that line generates millimeter wave transceiving module transmits and is transmitted to tested human body; Reception antenna connectsReceive the echo-signal that tested human body returns and echo-signal is sent to millimeter wave transceiving module; Millimeter waveData acquisition and processing (DAP) module is processed and sent to transceiver module to echo-signal; Data acquisition andProcessing module is to processing to generate the graphics of tested human body from the signal of millimeter wave transceiving modulePicture; And image-display units shows the 3-D view being generated by data acquisition and processing (DAP) module.
By technical scheme of the present invention, compared with existing millimeter wave three-dimensional imaging detection system, letterChange system architecture, improved resolution ratio, shortened imaging time, and there is larger visual field.
Brief description of the drawings
Fig. 1 is the composition frame chart of human body security check system of the present invention.
Fig. 2 is the structural schematic diagram of human body security check system of the present invention.
Fig. 3 is the circuit diagram of the millimeter wave transceiving module in human body security check system of the present invention.
Fig. 4 is the holography three of carrying out in the data acquisition and processing (DAP) module of human body security check system of the present inventionThe flow chart of dimensional imaging algorithm.
Fig. 5 is the objective imaging schematic diagram of human body security check system of the present invention.
Fig. 6 is the flow chart of human body safety check method of the present invention.
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawingAnd embodiment, the present invention is further elaborated. Should be appreciated that described herein concreteEmbodiment only, in order to explain the present invention, is not intended to limit the present invention.
Mm-wave imaging system is mainly divided into millimeter wave Active Imaging and millimeter wave imaging and passive imaging. This quiltThe advantage of moving millimeter wave imaging system is relatively simple for structure, realizes cost also lower, and shortcoming becomes exactlyPicture oversize, poor imaging resolution of time. Along with raising and the millimeter wave device of millimetric wave device levelThe development of part technology, millimeter wave Active Imaging starts to be subject to increasing attention. At millimeter wave initiativelyIn imaging, initiatively synthetic aperture imaging and active holographic imaging are main imaging systems. Millimeter wave is completeThe method of breath imaging is the method that comes from optical holographic, and millimeter wave holographic imaging utilizes electromagnetic relevantPrinciple, first emitter will be by the millimeter-wave signal of transmitting high stable, and receiver is accepted in target eachThe transmitting and by the processing that is concerned with of echo-signal and highly relevant reference signal, extracting of pointThe amplitude of echo-signal and phase information, thus the emission characteristics on impact point obtained, finally passing throughThe method of data and image processing just can obtain the target millimeter-wave image in scene. Millimeter wave initiativelyThe millimeter-wave image good resolution that holographic imaging obtains, is matching and can greatly shorten into mechanical scanningThe picture time, can realize through engineering approaches, so being particularly suitable for millimeter wave short range, millimeter wave holographic imaging initiatively becomesPicture.
Describe embodiments of the invention in detail referring to accompanying drawing.
Fig. 1 is the composition frame chart of human body security check system of the present invention. Fig. 2 is human body safety check of the present inventionThe structural schematic diagram of system.
As shown in Figure 1, human body security check system of the present invention comprises: transmitting antenna 14, and for to testedHuman body sends millimeter wave and transmits; Reception antenna 15, for receiving the echo returning from tested human bodySignal; Millimeter wave transceiving module 11, sends to the millimeter wave of tested human body to transmit also for generatingReceive and process the echo-signal from reception antenna 15; Scanning means 10, for fixing and move milliMetric wave transceiver module 11, transmitting antenna 14 and reception antenna 15; Data acquisition and processing (DAP) module 12,The echo-signal of exporting from millimeter wave transceiving module 11 for acquisition and processing is to generate three of tested human bodyDimension image; And image-display units 13, generated by data acquisition and processing (DAP) module 12 for showing3-D view.
As shown in Figure 2, scanning means 10 for example, by vertical direction guide rail 21, motor (, stepper motor)22 and plane detection faces plate 23 form. Specifically, scanning means 10 comprises two plane detection facesPlate 23 supports millimeter wave transceiving module 11, transmitting antenna 14 and reception antenna 15, tested human body 24Being placed in two planes detects between panel 23. Scanning means 10 also comprises two pairs of guide rails 21, establishes respectivelyPut the both sides of detecting panel 23 on every plane, millimeter wave transceiving module 11, transmitting antenna 14 and connectReceiving antenna 15 moves up and down along guide rail 21. Scanning means 10 also comprises and is positioned at that to detect panel 23 otherControl motor 22, it is for controlling millimeter wave transceiving module 11, transmitting antenna 14 and reception antenna 15Along moving up and down of guide rail 21, thereby tested human body 24 is scanned up and down.
Further as shown in Figure 2, detect on panel 23 N millimeter wave transceiving mould is set on every planePiece 11, a N transmitting antenna 14 and N reception antenna 15, each millimeter wave transceiving module 11 is rightAnswer a transmitting antenna 14 and a reception antenna 15, N millimeter wave transceiving module 11 is arranged side by sideWith shape millimeter wave transceiving system in a row, N transmitting antenna 14 is arranged side by side to form launching antenna arrayRow, and N reception antenna 15 be arranged side by side to form receiving antenna array, wherein N is greater thanEqual 2 integer.
In addition, carry out one by one the transmitting of millimeter wave according to SECO N millimeter wave transceiving module 11And reception, thereby complete the horizontal sweep to tested human body. For example,, to N millimeter wave transceiving module11 control can realize by single pole multiple throw, can certainly adopt known in the artWhat time sequence control device.
In addition, tested human body also can move to improve image taking speed.
Also it is noted that the included millimeter wave transceiving module 11 of row's millimeter wave transceiving system and correspondenceTransmitting antenna 14 and the quantity of reception antenna 15 can according to plane detect panel 23 width andThe parameters such as the image taking speed of realizing arrange, and the width of plane detection panel 23 can basisThe size of tested human body 24 is determined. In addition, plane detects between panel 23 and tested human body 24Distance can be determined according to indexs such as antenna parameters. The setting of above mentioned size is for this areaTechnical staff is apparent, is therefore no longer described in detail.
For example, 1 row's millimeter wave transceiving system can comprise 64 millimeter wave transceiving modules 11 and 128Individual antenna, wherein 1-64 transmitting antenna composition transmitting antenna array 14, for by 64 millimeter wavesThe linear frequency modulation continuous wave that transceiver module 11 produces is radiated on measured target 24, connects and 65-128 is individualReceive antenna composition receiving antenna array 15, for receiving the signal being reflected back by tested human body and transferring to64 millimeter wave transceiving modules 11. The corresponding reception antenna of each transmitting antenna, transmitting antenna 1,2,3 ..., 63 and 64 respectively corresponding reception antenna 65,66,67 ..., 127 and 128. As above instituteState, these 64 millimeter wave transceiving modules 11 are not worked simultaneously, but for example many by two-layer hilted broadswordThrow switch is controlled, and they are are one by one transmitted and received,
Fig. 3 is the circuit diagram of the millimeter wave transceiving module in human body security check system of the present invention.
As shown in Figure 3, millimeter wave transceiving module 11 comprises: transmitting chain, and by signal source 301, fixedForm to coupler 302, power amplifier 303, varactor doubler 304, send to tested for generationThe millimeter wave of human body 24 transmits; And receiver, by signal source 307, directional coupler 309,Frequency mixer 310,312,313, power amplifier 311,314, varactor doubler 312,315 and lowNoise amplifier 317 forms, for receiving echo-signal that tested human body 24 returns and to echo-signalProcess to send to data acquisition and processing (DAP) module 12.
Specifically, signal source 301 be operating frequency in certain frequency scope (for example,13.5GHz-16.5GHz) frequency modulation signal source, can be expressed as:
Wherein, A1 is expressed as initial magnitude, f1For preliminary sweep frequency 13.5GHz, t is the time,For the initial phase place value of signal source 301, B is FM signal bandwidth, and T is the frequency modulation cycle.
In addition, signal source 307 is for example, single-frequency at a fixed frequency (, 35MHz) of operating frequencyRate continuous wave signal source, can be expressed as:
Its initial magnitude and phase place be respectively A2 andFrequency is f2.
Note, the frequency of the frequency range of above-mentioned signal source 301 and signal source 307 can be according to resolutionRate requirement etc. is selected, and this knows to those skilled in the art altogether, no longer retouches hereinState.
Directional coupler 302 is three port devices, and its input receives the output of signal source 301Signal, straight-through end is connected to power amplifier 303, thereby makes the power of transmitting chain reach varactor doubler304 safe input power ranges. After varactor doubler 304, the frequency frequency multiplication to the of transmitting chainTwo frequency ranges (be 13.5GHz-16.5GHz in the frequency range of signal source 301, thisThe frequency range at place is 27GHz-33GHz), be finally radiated and in space, arrive quilt by a transmitting antennaSurvey human body. Herein, transmit and can be expressed as:
Wherein, A1' be the amplitude transmitting.
The output signal in secondary signal source 307 is connected to the input of directional coupler 309. Frequency mixer310 is three port devices, and the straight-through end that wherein medium-frequency IF end connects directional coupler 309 is with defeatedEnter the intermediate-freuqncy signal of for example 35MHz, radio frequency end connects the coupled end of directional coupler 302 with defeatedEnter the FM signal of for example 13.5GHz-16.5GHz, local oscillator LO end is exported RF and the input of IF endThe difference frequency signal of signal improve to power amplifier 311. Power amplifier 311 makes this signal powerBe amplified in the range of safety operation of varactor doubler 312. Now, the output signal of varactor doubler 312Be the signal after two signal source mixing and then two frequencys multiplication, can be expressed as:
Frequency mixer 313 is three port devices, and wherein local oscillator LO end connects the defeated of varactor doubler 312Go out signal S (t), radio frequency end obtains the echo from tested human body reflection that reception antenna 15 receivesSignal. Echo-signal now can be expressed as:
Wherein, α is echo-signal attenuation coefficient, and τ=2R/c is the echo time delay that testee produces,C is the spread speed of electromagnetic wave in space.
The medium-frequency IF end of frequency mixer 313 is exported the super of signal that local oscillator LO and radio frequency termination receiveHeterodyne signal, wherein in this signal with certain extraterrestrial target information, can be expressed as:
From (6) formula, can find out the incoherence of two signal sources, in order to obtain coherent signal, drawEnter frequency mixer 316. Frequency mixer 316 is exported the relevant superheterodyne signal with target information, its radio frequencyEnd input is from the S of down-conversion signal first of frequency mixer 313IF(t), local oscillator end is inputted by signal source 307The example of exporting through directional coupler 309 coupled end, power amplifier 314 and varactor doubler 315As the continuous wave signal of 70MHz, that is:
Wherein, A2' be signal amplitude.
Frequency mixer 316 medium-frequency IF ends are exported the S of down-conversion signal for the second time with target informationIF(t),That is:
Can find out from formula (8), adopt the method to eliminate the phase place that incoherent dual signal source is introducedAsynchronous.
Low-noise amplifier 317 can make to amplify through the faint intermediate-freuqncy signal of twice down coversion,The signal to noise ratio, the detectivity that improve output signal, its output signal is admitted to data acquisition and processing (DAP)Module 12.
Fig. 4 is the holography three of carrying out in the data acquisition and processing (DAP) module of human body security check system of the present inventionThe flow chart of dimensional imaging algorithm.
As shown in Figure 4, the signal collecting is first carried out echo by data acquisition and processing (DAP) module 12The collection (401) of information, by it together with the signal contact of locus. Then utilize Fourier to becomeThe Fourier transformation (402) of the capable geometrical property of swap-in, carries out inverse Fourier transform (403) after abbreviation distortion,Finally obtain target three-dimensional image (404), carry out obtaining of final data in conjunction with spatial domain positional information.
Fig. 5 is the objective imaging schematic diagram of human body security check system of the present invention.
As shown in Figure 5, Millimeter Wave via is crossed after the scattering that the location point (x, y, z) of target 502 locates, positionFor the reception antenna 501 of (X, Y, Z0) starts to receive the wideband echoes signal after scattering. Antenna will receiveTo signal send into millimetre-wave circuit and highly relevant local oscillation signal carries out down coversion, then pass through low noiseAcoustic amplifier 317. If the signal obtaining is E (X, Y, ω), wherein ω is the instantaneous angular frequency of emission source,E (X, Y, ω) is the function about ω, and its expression formula is:
Wherein,The distance between antenna and impact point,For electromagnetic wave beam, exponential part representsThe spherical wave signal of target scattering, plays an important role to target three-dimensional scattering imaging. And:
E (X, Y, ω) is time-domain signal, and it is that time dimension signal E (X, Y, t) is carried out after Fourier transformationExpression formula, that is:
E(X,Y,ω)＝FT[E(X,Y,t)](11)
Bring formula (10) into formula (9), the vector calculus of formula (9) is simplified to scalar operation, from thingIn reason meaning, understand, can regard as a spherical wave is launched, be expressed as the stack of plane wave, obtain:
Formula has been used three-dimensional Fourier transform in (12), that is:
Also be an inverse Fourier transform, that is:
Formula has been ignored constant term in (13), and (13) formula substitution (12) formula can be obtained:
Formula (15) is carried out to inverse transformation, can obtain final broadband millimeter-wave holographic imaging formula and be:
From formula (16), can find out, as long as obtain the electromagnetic information of the echo-signal of each Frequency point,Just can obtain f (x, y, z) by a series of invertings, finally obtain the three-dimensional millimeter wave holography of imageable targetImage.
Fig. 6 is the flow chart of human body safety check method of the present invention.
As described in Figure 6, utilize above-mentioned human body security check system to carry out the millimeter wave hologram three-dimensional of tested human bodyImaging detection method comprises the following steps: scanning means move millimeter wave transceiving module, transmitting antenna andReception antenna scans tested human body; Millimeter wave transceiving module generates millimeter wave and transmits; Transmitting dayThe millimeter wave that line generates millimeter wave transceiving module transmits and is transmitted to tested human body; Reception antenna connectsReceive the echo-signal that tested human body returns and echo-signal is sent to millimeter wave transceiving module; Millimeter waveData acquisition and processing (DAP) module is processed and sent to transceiver module to echo-signal; Data acquisition andProcessing module is to processing to generate the graphics of tested human body from the signal of millimeter wave transceiving modulePicture; And image-display units shows the 3-D view being generated by data acquisition and processing (DAP) module.
The present invention passes through to adopt above-mentioned safe examination system and method, compared with existing mm-wave imaging instrument,Have advantages of following outstanding:
(1) cheap: the present invention utilizes drive motors to make one-dimensional array antenna realize sweeping of face arrayRetouch effect, greatly reduced cost.
(2) simple in structure, easy of integration: the inventive example is as adopted the control millimeter waves such as single pole multiple throwThe job order of transceiver module passage, and adopt frequency modulation signal source and millimetric wave device to carry out systemBuild, greatly reduce the complexity of system, also improved the integrated level of system simultaneously.
(3) resolution ratio is high: the present invention adopts CW with frequency modulation technology, superhet technology and holographic one-tenthAs technology, improve the resolution ratio of 3-D view plane and the degree of depth.
(4) imaging time is fast: when the present invention adopts driven by motor dual-mode antenna to move up and down, also canTo allow tested human body travel forward with certain speed, greatly improve image taking speed.
(5) visual field increases: compared with existing 50 centimetres of following visual fields, and embodiments of the inventionCan reach several meters, even the visual field of tens meters.
(6) signal to noise ratio is high: system adopts active mm-wave imaging, by controlling each millimeter wave deviceThe output power range of part improves the transmitting power of antenna, and certainly, transmitting power is at safe radiation modelWithin enclosing, make echo-signal signal to noise ratio receive signal higher than passive millimeter wave imaging system far awaySignal to noise ratio, and then obtain higher image quality.
(7) of many uses: to utilize mm-wave imaging technology high-resolution and advantages of simple structure and simple, removeCarry out outside the safety detection of human body, can also carry out the detection of the outer damage of all kinds of large-scale instruments,Also be applicable to the detection of contraband.
It should be noted that, above with reference to described each embodiment of accompanying drawing only in order to the present invention to be describedBut not limit the scope of the invention, those of ordinary skill in the art should be appreciated that and do not departing from thisThe amendment of under the prerequisite of bright spirit and scope, the present invention being carried out or be equal to replacement, all should be encompassed inWithin scope of the present invention. In addition, except context refers else, the word bag occurring with singulativeDraw together plural form, vice versa. In addition, unless stated otherwise, so any embodiment whole orA part can be used in conjunction with all or part of of any other embodiment.
Claims (10)
1. a human body security check system, is characterized in that, described safe examination system comprises:
Transmitting antenna, transmits for sending millimeter wave to tested human body;
Reception antenna, for receiving the echo-signal of returning from described tested human body;
Millimeter wave transceiving module, sends to the millimeter wave of described tested human body transmit and connect for generatingReceive and process the described echo-signal from described reception antenna;
Scanning means, for fix and move described millimeter wave transceiving module, described transmitting antenna and described inReception antenna;
Data acquisition and processing (DAP) module, the returning from described millimeter wave transceiving module output for acquisition and processingRipple signal is to generate the 3-D view of described tested human body; And
Image-display units, for showing the described graphics being generated by described data acquisition and processing (DAP) modulePicture.
2. human body security check system according to claim 1, is characterized in that, described scanning means bagDraw together:
Two planes detect panel, for supporting described millimeter wave transceiving module, described transmitting antenna and instituteState reception antenna, described tested human body is placed in described two planes and detects between panel;
Two pairs of guide rails, are separately positioned on every plane and detect the both sides of panel, described millimeter wave transceiving module,Described transmitting antenna and described reception antenna move up and down along guide rail; And
Motor, for controlling described millimeter wave transceiving module, described transmitting antenna and described reception antenna edgeMoving up and down of described guide rail.
3. human body security check system according to claim 2, is characterized in that, detects on every planeN millimeter wave transceiving module, a N transmitting antenna and N reception antenna are set, each milli on panelThe corresponding transmitting antenna of metric wave transceiver module and a reception antenna, described N millimeter wave transceiving moduleBe arranged side by side with shape millimeter wave transceiving system in a row, a described N transmitting antenna is arranged side by side to form to be sent outPenetrate aerial array, and a described N reception antenna is arranged side by side to form receiving antenna array, wherein NTo be more than or equal to 2 integer.
4. human body security check system according to claim 3, is characterized in that, a described N millimeter waveTransceiver module carries out transmitting and receiving of millimeter wave one by one according to SECO.
5. human body security check system according to claim 1, is characterized in that, described millimeter wave transceivingModule comprises:
Transmitting chain, sends to the millimeter wave of described tested human body to transmit for generating; And
Receiver, for receiving the echo-signal that described tested human body returns and described echo-signal being enteredRow is processed to send to described data acquisition and processing (DAP) module.
6. human body security check system according to claim 5, is characterized in that, described transmitting chain bagDraw together:
First signal source, described first signal source is the frequency modulation signal source being operated within the scope of first frequency;
The first directional coupler, the input of described the first directional coupler is connected to described first signal source,Straight-through end is connected to described the first power amplifier;
The first power amplifier, the power of the output signal to described the first directional coupler amplify withReach the safe input power range of the first varactor doubler; And
Described the first varactor doubler, by signal two frequencys multiplication to the second of described the first power amplifier output frequentlyRate scope, and export the signal after two frequencys multiplication to described transmitting antenna.
7. human body security check system according to claim 6, is characterized in that, described receiver bagDraw together:
Secondary signal source, described secondary signal source is the point-frequency signal source that is operated in first frequency;
The second directional coupler, the input of described the first directional coupler is connected to described secondary signal source;
The first frequency mixer, the intermediate frequency end of described the first frequency mixer is connected to the straight of described the second directional couplerGo side, radio-frequency head is connected to the coupled end of described the first directional coupler, to produce described first signal sourceDifference frequency signal with described secondary signal source;
The second power amplifier, the input of described the second power amplifier is connected to described the first frequency mixerLocal oscillator end to receive described difference frequency signal, and the power of described difference frequency signal is amplified to reachThe safe input power range of two varactor doublers;
The second varactor doubler, the input of described the second varactor doubler is connected to described the second power amplifierOutput, the output signal of described the second power amplifier is carried out to two frequencys multiplication to second frequency;
The second frequency mixer, the local oscillator end of described the second frequency mixer is connected to the output of described the second varactor doublerEnd, radio-frequency head receives echo-signal that described reception antenna receives to generate down-conversion signal first;
The 3rd power amplifier, the input of described the 3rd power amplifier is connected to described the second directed couplingClose the coupled end of device, the signal from described the second directional coupler is carried out to power amplification;
The 3rd varactor doubler, the input of described the 3rd varactor doubler is connected to described the 3rd power amplifierOutput, the signal from described the 3rd power amplifier is carried out to two frequencys multiplication and is operated to described second frequentlyRate;
Three-mixer, the local oscillator end of described three-mixer is connected to the output of described the 3rd varactor doublerEnd, radio-frequency head is connected to the intermediate frequency end of described the second frequency mixer to generate secondary down-conversion signal; And
Low-noise amplifier, the input of described low-noise amplifier be connected to described three-mixer inFrequently end, amplifies and exports described data acquisition to and locate the described secondary down-conversion signal receivingReason module.
8. human body security check system according to claim 7, is characterized in that, described first frequency modelEnclose for 13.5GHz-16.5GHz, described second frequency scope is 27GHz-33GHz, described first frequencyFor 35MHz, and described second frequency is 70MHz.
9. human body security check system according to claim 1, is characterized in that, in described data acquisitionIn processing module, gather the echo-signal from described millimeter wave transceiving module, by echo-signal and skyBetween position signalling be linked together, then carry out Fourier transformation and inverse Fourier transform and obtain graphicsPicture.
10. a right to use requires the human body that in 1 to 9, the human body security check system described in any one carries outSafety inspection method, is characterized in that, comprises the following steps:
Described scanning means moves described millimeter wave transceiving module, described transmitting antenna and described reception antennaScan described tested human body;
Described millimeter wave transceiving module generates millimeter wave and transmits;
The described millimeter wave that described transmitting antenna generates described millimeter wave transceiving module transmits and is transmitted toDescribed tested human body;
The echo-signal that the described tested human body of described reception antenna reception returns also sends described echo-signalGive described millimeter wave transceiving module;
Described millimeter wave transceiving module described echo-signal is processed and send to described data acquisition andProcessing module;
Described data acquisition and processing (DAP) module to process from the signal of described millimeter wave transceiving module withGenerate the 3-D view of described tested human body; And
Described image-display units shows the described graphics being generated by described data acquisition and processing (DAP) modulePicture.
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