CN105974491A - Terahertz safety check imaging system based on vector network analyzer - Google Patents
Terahertz safety check imaging system based on vector network analyzer Download PDFInfo
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- CN105974491A CN105974491A CN201610295499.2A CN201610295499A CN105974491A CN 105974491 A CN105974491 A CN 105974491A CN 201610295499 A CN201610295499 A CN 201610295499A CN 105974491 A CN105974491 A CN 105974491A
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- signal
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- network analyzer
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- safety check
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
- G01V8/10—Detecting, e.g. by using light barriers
Abstract
The invention discloses a terahertz safety check imaging system based on a vector network analyzer. The terahertz safety check imaging system comprises a signal generation and acquisition apparatus, a simulation front end, a scanning drive unit and a signal and data processor, wherein the vector network analyzer serves as the signal generation and acquisition apparatus, the simulation front end radiates the upconversion to terahertz wave band of stepped frequency signals of X wave band to a space to be checked and conducts signal processing for the down conversion to the X wave band of target echo signals of the terahertz wave band, and a master control computer controls the scanning drive unit and the signal and data processor. A user can adjust corresponding scanning parameters according to actual situation in order to realize optimal detection and improve the efficiency of a safety check system. A terahertz SAR imaging system employed has excellent penetrability for cloths, foam and cardboards, and articles hidden in packages and clothes on a human body can be effectively detected. The resolution and precision are high.
Description
Technical field
The invention belongs to safety check technical field, be specifically related to a kind of Terahertz based on X-band vector network analyzer three
Dimension safety check imaging system.
Technical background
Traditional safety check technology by harmless, the aspects such as tested person's secret protection are limited, it tends to be difficult to realize
The reliability of human body and luggage thereof is detected.Along with the more sternness of international anti-terrorism situation, improving tradition safety check technical efficiency
While, need the safe examination system developing New System to realize more efficiently detection.
Terahertz (terahertz, THz) ripple is often referred to the frequency electromagnetic wave at 100GHz ~ 10THz, is in electronics and acquires
The transition frequency range of optics.THz wave has good penetrance to a lot of apolar substances, and it can penetrate with the least decay
The materials such as cloth, foam, cardboard；And water is allowed to penetrate human body skin to strong absorption of THz wave, therefore to human body
Impact also can only rest on skin surface, unlike microwave can penetrate the inside of human body.It addition, the energy of Terahertz photon is only
10-3EV, less than the bond energy of various chemical bonds, will not cause harmful ionization reaction, therefore survivable detected material.Cause
This, terahertz imaging supplementing as the technology such as x-ray imaging and metal detection, before field of safety check has great application
Scape.
Terahertz imaging system can be divided into scanning imagery, SAR and ISAR imaging for imaging system.Wherein, terahertz
Hereby SAR and ISAR imaging is the extension being imaged on microwave radar in frequency range, be based on electronics with semiconductor solid-state device,
A kind of imaging mode based on electron tube etc., with conventional radar signal processing as means.Imaging system with its all band
System is compared, although Terahertz SAR and ISAR imaging system are relatively costly, but its imaging results in terms of resolution and quantity of information all
There is obvious advantage.
Summary of the invention
It is desirable to provide a kind of Terahertz 3-D imaging system being applied to field of safety check, this system is based on X-band
Vector network analyzer, efficiently solve existing Terahertz safe examination system contradiction between device cost and imaging effect.
Technical scheme is as follows:
Terahertz safety check imaging system based on vector network analyzer, it is characterised in that: include signal produce with harvester,
AFE (analog front end), scanning driving device, signal and data processing equipment；
Signal produces and harvester, before the stepped frequency signal producing the X-band of certain bandwidth and collection receiver simulation
The X-band signal of end output；
Receiver AFE (analog front end), is divided into transmitting branch and receiving branch, and wherein, transmitting branch is for producing signal and gathering dress
The stepped frequency signal of raw X-band of buying property is processed as the stepped frequency signal of terahertz wave band, and receiving branch is for by THz wave
The target echo signal of section is processed as X-band signal；
Scanning driving device, is scanned for fixed-analog front end；
Signal and data processing equipment, be processed into picture for signal produces the signal producing with harvester and gathering.
Described signal produces and uses vector network analyzer to realize with harvester.
Described receiving branch includes: doubler, frequency mixer, wave filter, low-noise amplifier, reception antenna, transmitting branch
Including: doubler, frequency mixer, wave filter, low-noise amplifier, transmitting antenna.
Described scanning driving device includes controllor for step-by-step motor and stepped track, and described AFE (analog front end) is existed by object stage
It is fixed in stepped track.
Described stepped track include orientation to track and height to track, orientation to track with the most vertical to track
Directly.Further, described orientation is driven by controllor for step-by-step motor to track to track and height.
Described controllor for step-by-step motor is by control azimuth rotation of rotating shaft in track to track and height, it is achieved to load
Thing platform position is the trickle change on track to track and height in orientation, realize further to launch antenna in orientation to height
Spend to aperture synthetic.Additionally, orientation is respectively arranged with stopping means to track and height in the rotating shaft of track.
Described signal and data processing equipment mainly use high performance main control computer to realize.
The operation principle of described Terahertz safety check imaging system is as follows:
First, signal the stepped frequency signal produced with harvester upper change after doubler, frequency mixer, filter process is produced
Frequency is to terahertz wave band, then is carried out power amplification by low-noise amplifier, sends out finally by launching sky alignment area radiation to be checked
Penetrate signal；
Then, launching signal and produce target echo signal through target reflection, target echo signal is entered system by reception antenna；Enter
Enter the reception signal after system by reception signal being downconverted to X after the doubler of AFE (analog front end), frequency mixer, filter process
Wave band, and achieve a butt joint collect mail number power amplification and frequency domain filtering；
Receive signal to produce and harvester through AFE (analog front end) output entering signal, signal produce and achieve a butt joint with harvester
The collection of the collection of letters number, and output this to signal and data processing equipment；
Described signal and data processing equipment produce the collection signal with harvester to signal and carry out real-time storage, utilize three-dimensional
Back-projection algorithm carries out imaging to gathering signal, and is processed original image by image enhaucament, ATD scheduling algorithm,
After by signal and data processing equipment, the three-dimensional imaging result after processing is shown.
Further, signal and data processing equipment are additionally operable to be controlled controllor for step-by-step motor by ethernet line
System.
User can arrange corresponding parameter by signal and data processing equipment, revises scanning area, scanning speed, sky
The information such as line step distance, to realize rapidly and effectively detecting region to be checked.
Further, controllor for step-by-step motor sets according to the parameter of the signal received and data processing equipment, passes through
Control in stepped track the parameter informations such as the speed of axis of rotation, the number of turns and control aerial position；When aerial position changes,
Controllor for step-by-step motor returns the positional information that antenna is current, signal and data processing equipment root to signal and data processing equipment
Whether reach the maximum of scanning area according to aerial position and send next step control information to controllor for step-by-step motor；If reaching
Maximum, next step control information will make aerial position make zero；If being not reaching to maximum, control information will make antenna along
Current orbit continues to move in units of step distance.
Beneficial effects of the present invention is as follows:
1. the present invention uses Terahertz SAR imaging system to construct the 3-D imaging system for safety check, and this system is to cloth, bubble
The material such as foam, cardboard has good penetrance, is capable of effectively for the concealment article in parcel and human body medicated clothing
Detection；
2. the present invention can reach the resolution less than 7.5mm, and the three-dimensional imaging to concealment article becomes apparent from and accurately, for safety check
The rate of precision of technology provides support reliably；
3. the present invention utilizes vector network analyzer to produce and harvester as signal, by AFE (analog front end) by the step of X-band
Enter frequency signal up-conversion to terahertz wave band to space radiation to be checked, then by AFE (analog front end) by the target echo of terahertz wave band
Signal downconverts to X-band and carries out signal processing；Stable system performance and hardware cost are relatively low.
4. the present invention utilizes main control computer to be controlled scanning driving device, signal and data processing equipment, user
The efficiency of safe examination system can be improve according to the practical situation corresponding sweep parameter of adjustment to realize optimal detection.
5. the present invention uses a kind of contactless security action, and meanwhile, when detecting human body, testing result does not shows
Show any health minutia, the individual privacy of the tested personnel that adequately protected.
Accompanying drawing explanation
Fig. 1 is the block diagram of system of the embodiment of the present invention；
Fig. 2 is the fundamental diagram of the scanning driving device of the embodiment of the present invention；
Fig. 3 is the working-flow figure of the embodiment of the present invention.
Detailed description of the invention
The present invention builds based on vector network analyzer, utilizes Terahertz SAR imaging technique, it is achieved that to parcel and human body
The detection of concealment object.The basic composition of the present invention as it is shown in figure 1, mainly include signal produce with harvester, AFE (analog front end),
Scanning driving device, signal and data processing equipment four part.
Described signal produces and uses vector network analyzer to realize with harvester.The signal of the present invention produces and gathers work
Make to be completed by vector network analyzer.As signal generation device, vector network analyzer is for producing the X-band of nominated bandwidth
Stepped frequency signal；Meanwhile, as signal pickup assembly, vector network analyzer is for exporting this safe examination system AFE (analog front end)
Analog-signal transitions be digital signal.
Described AFE (analog front end) is divided into transmitting-receiving two-way, and receiving branch includes: doubler, frequency mixer, wave filter, low noise amplification
Device, reception antenna, transmitting branch includes: doubler, frequency mixer, wave filter, low-noise amplifier, transmitting antenna.Wherein, frequency multiplication
Device is used for the transmitting signal up-conversion of vector network analyzer generation to terahertz wave band at transmitting branch with frequency mixer, is connecing
Revenue and expenditure road is for downconverting to X-band by the target echo signal that antenna receives；Wave filter and low-noise amplifier are for letter
Number carry out frequency domain filtering gating and power amplification；Dual-mode antenna is used for field emission to be checked and receives electromagnetic wave.
Described scanning driving device includes controllor for step-by-step motor and stepped track, and described AFE (analog front end) is existed by object stage
It is fixed in stepped track.Wherein, stepped track include orientation to track and height to track, orientation to track and height to
Track is mutually perpendicular to.Further, orientation is driven by controllor for step-by-step motor to track to track and height, by controlling
Orientation rotation of rotating shaft in track to track and height, it is achieved to stage position in orientation to track with highly on track
Trickle change, realize further to launch antenna in orientation to height to aperture synthetic.Additionally, orientation is to track and height
Degree is respectively arranged with stopping means in the rotating shaft of track.
Described signal and data processing equipment mainly use high performance main control computer to realize.Main control computer utilizes three
Dimension back-projection algorithm carries out imaging to gathering signal, and is processed original image by image enhaucament, ATD scheduling algorithm,
Finally the three-dimensional imaging result after processing is shown.
The groundwork flow process of the present invention is as it is shown on figure 3, be embodied as:
Step one, vector network analyzer receives the parameter of systems soft ware in main control computer and sets, launches the X specified under parameter
The stepped frequency signal of wave band, the carrier frequency of signal is with (step frequency) for being spaced uniform stepping, signal bandwidth(N be from
Dissipate frequency number).
Step 2, vector network analyzer the stepped frequency signal of the X-band produced is after doubler processes with frequency mixer
Up-conversion is to terahertz wave band, more filtered device filters low frequency component, finally by low-noise amplifier, it is carried out power amplification.
Step 3, antenna uses the mode of " step one is stopped " launch and accept electromagnetic wave.Controllor for step-by-step motor receives main
In control computer, the parameter of systems soft ware sets, and is controlled by information such as the speed of axis of rotation, the number of turns in control stepped track
Aerial position.The operation principle of scanning driving device is as shown in Figure 2.When aerial position changes, controllor for step-by-step motor
Returning the current positional information of antenna to main control computer, whether main control computer reaches scanning area according to aerial position
Big value sends next step control information to controllor for step-by-step motor.If reaching maximum, next step control information will make sky
Line position makes zero；If being not reaching to maximum, control information will make antenna continue in units of step distance along current orbit
Mobile.
With step distance as 1mm, azel is as a example by the experimental situation that scanning area is 200 × 200mm, and antenna is first
First move in the way of " step one is stopped " in orientation according to command speed along orientation to track, antenna in orientation to
Displacement often increases 1mm, launches sky one section of stepped frequency signal of alignment field emission to be checked, and receives anti-by target by reception antenna
The echo-signal penetrated；When antenna in orientation to displacement reach 200mm time, antenna in orientation the position on track zero, this
Time, antenna is first highly moving up 1mm, continues upwards to move in orientation then according to aforementioned manner；The rest may be inferred, when
Antenna in orientation to height to displacement all reach 200mm time, single pass completes, and azel makes zero to simultaneously.
Step 4, the AFE (analog front end) of system utilizes and launches the mesh that reception antenna is received by the corresponding local oscillation signal of signal
Mark echo-signal carries out down coversion, and the power amplification collected mail number and frequently of being achieved a butt joint by low-noise amplifier and wave filter
Territory spatially selecting filtering, realizes by analogue signal to the conversion of digital signal finally by vector network analyzer.
Step 5, the signal of vector network analyzer collection is stored by main control computer, and utilizes MATLAB software
Process gathering signal.This system first to gather signal distance to doing inverse Fourier transform, obtain target echo letter
Number time domain response, i.e. one-dimensional range profile；Subsequently, system utilizes three-dimensional back-projection algorithm to process signal, this algorithm
Three-dimensional imaging space is divided into the grid of M × N × P, connects by calculating the target echo signal arrival reflected by each mesh point
Receive antenna time delay echo-signal is carried out coherent superposition with obtain azel to high-resolution；Finally calculated by master control
Three-dimensional imaging result after image procossing is shown by machine.
Claims (11)
1. a Terahertz safety check imaging system based on vector network analyzer, it is characterised in that: include that signal produces and adopts
Acquisition means, receiver AFE (analog front end), scanning driving device, signal and data processing equipment；
Signal produces and harvester, for producing the stepped frequency signal of X-band and gathering the X ripple of receiver AFE (analog front end) output
Segment signal；
Receiver AFE (analog front end), is divided into transmitting branch and receiving branch, and wherein, transmitting branch is for producing signal and gathering dress
The X-band stepped frequency signal buying property raw is processed as the stepped frequency signal of terahertz wave band, and receiving branch is for by terahertz wave band
Target echo signal be processed as X-band signal；
Scanning driving device, is scanned for fixed-analog front end；
Signal and data processing equipment, be processed into picture for signal produces the signal producing with harvester and gathering.
Terahertz safety check imaging system based on vector network analyzer the most according to claim 1, it is characterised in that: institute
State signal to produce and harvester employing vector network analyzer realization.
Terahertz safety check imaging system based on vector network analyzer the most according to claim 1, it is characterised in that: institute
Stating receiving branch to include: doubler, frequency mixer, wave filter, low-noise amplifier, reception antenna, transmitting branch includes: frequency multiplication
Device, frequency mixer, wave filter, low-noise amplifier, transmitting antenna.
Terahertz safety check imaging system based on vector network analyzer the most according to claim 1, it is characterised in that: institute
Stating scanning driving device and include controllor for step-by-step motor and stepped track, described AFE (analog front end) passes through object stage in stepped track
It is fixed.
Terahertz safety check imaging system based on vector network analyzer the most according to claim 4, it is characterised in that: institute
State stepped track and include that orientation is mutually perpendicular to track with height to track to track, orientation to track and height；Described orientation
It is driven by controllor for step-by-step motor to track to track and height.
Terahertz safety check imaging system based on vector network analyzer the most according to claim 5, it is characterised in that: institute
State controllor for step-by-step motor by control azimuth to track and height the rotation of rotating shaft in track, change object stage in orientation to
Track and height position on track, it is achieved to launch antenna in orientation to height to aperture synthetic.
Terahertz safety check imaging system based on vector network analyzer the most according to claim 6, it is characterised in that: with
Shi Fangwei is respectively arranged with stopping means to track and height in the rotating shaft of track.
Terahertz safety check imaging system based on vector network analyzer the most according to claim 1, it is characterised in that: institute
State signal and data processing equipment uses main control computer to realize.
Terahertz safety check imaging system based on vector network analyzer the most according to claim 1, it is characterised in that be
The operation principle of system is as follows:
First, signal the stepped frequency signal produced with harvester upper change after doubler, frequency mixer, filter process is produced
Frequency is to terahertz wave band, then is carried out power amplification by low-noise amplifier, sends out finally by launching sky alignment area radiation to be checked
Penetrate signal；
Then, launching signal and produce target echo signal through target reflection, target echo signal is entered system by reception antenna；Enter
Enter the reception signal after system by reception signal being downconverted to X after the doubler of AFE (analog front end), frequency mixer, filter process
Wave band, and achieve a butt joint collect mail number power amplification and frequency domain filtering；
Receive signal to produce and harvester through AFE (analog front end) output entering signal, signal produce and achieve a butt joint with harvester
The collection of the collection of letters number, and output this to signal and data processing equipment；
Described signal and data processing equipment produce the collection signal with harvester to signal and carry out real-time storage, utilize three-dimensional
Back-projection algorithm carries out imaging to gathering signal, and processes original image, finally by signal and data processing equipment
Three-dimensional imaging result after processing is shown.
10., according to the Terahertz safety check imaging system based on vector network analyzer described in claim 1 or 9, its feature exists
In: controllor for step-by-step motor is controlled by described signal and data processing equipment by ethernet line.
11. according to the Terahertz safety check imaging system based on vector network analyzer described in claim 1 or 9, and its feature exists
In: user, corresponding parameter is set by signal and data processing equipment, amendment scanning area, scanning speed, antenna stepping away from
From information, to realize the detection to region to be checked.
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| CN201610295499.2A CN105974491A (en) | 2016-05-06 | 2016-05-06 | Terahertz safety check imaging system based on vector network analyzer |
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| CN110308443A (en) * | 2018-07-19 | 2019-10-08 | 北京理工大学 | A kind of reality wave beam electric scanning fast imaging human body safety check method and safe examination system |
| CN111505629A (en) * | 2020-05-08 | 2020-08-07 | 中国科学院国家空间科学中心 | Terahertz security inspection imaging system and method |
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| CN107315180A (en) * | 2017-05-12 | 2017-11-03 | 西安空间无线电技术研究所 | A kind of two frequency Terahertz holographic imaging method and system |
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| CN110308443A (en) * | 2018-07-19 | 2019-10-08 | 北京理工大学 | A kind of reality wave beam electric scanning fast imaging human body safety check method and safe examination system |
| CN109031284A (en) * | 2018-08-31 | 2018-12-18 | 博微太赫兹信息科技有限公司 | It is a kind of using millimeter wave or the sole safety check apparatus and method of Terahertz radar |
| CN109031255A (en) * | 2018-09-30 | 2018-12-18 | 清华大学 | The experimental provision of Terahertz radar scattering imaging |
| CN109031449A (en) * | 2018-10-29 | 2018-12-18 | 苏州耶拿微电子有限公司 | Using the passive superconduction Terahertz human body safety check instrument of WR10 waveguide |
| CN111505629A (en) * | 2020-05-08 | 2020-08-07 | 中国科学院国家空间科学中心 | Terahertz security inspection imaging system and method |
| CN114935756A (en) * | 2022-04-06 | 2022-08-23 | 电子科技大学 | Near-field millimeter wave synthetic aperture scanning imaging system and imaging method based on vector network analyzer |
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Application publication date: 20160928 |