CN102393536B - Scanning method for human body security check system utilizing frequency division and space division - Google Patents
Scanning method for human body security check system utilizing frequency division and space division Download PDFInfo
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- CN102393536B CN102393536B CN201110335134.5A CN201110335134A CN102393536B CN 102393536 B CN102393536 B CN 102393536B CN 201110335134 A CN201110335134 A CN 201110335134A CN 102393536 B CN102393536 B CN 102393536B
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Abstract
The present invention discloses a scanning method combing a human body security check system with frequency division and space division to avoid opposite radiation interference. During scanning, the operating frequency of a detection signal provided by a first millimeter wave transceiver is different with that of a detection signal provided by a second millimeter wave transceiver at the same moment; and in addition, during scanning, the detection altitude of an antenna unit in a first millimeter wave switching antenna array is different with that of an antenna unit in a second first millimeter wave switching antenna array at any moment. The method avoids the opposite radiation interference in switching antenna arrays on both sides of a millimeter wave active three-dimensional holographic imaging human body security check system, so as to improve the level of imaging definition.
Description
Technical field
The present invention relates to a kind of human body security check system.More specifically, the present invention relates to human body security check system and the scan method of the 3D hologram imaging of the high speed column rotation sweep active based on millimeter wave.
Background technology
The urgent of International Terrorism form proposed many-sided new demand to human body safety check, and the article that first need to realize under human body clothing is covered are realized the non-formula 3D hologram imaging detection of undressing, and improve the efficiency of identification suspicious object; The second, need to expand detectability, can realize detection to metal and non-metal article, comprise gun, cutter, explosive, drugs, CD, cash, liquid, chip, pottery etc.; Three, need on the basis that ensures above demand, reduce the harm of safe examination system detection means to health.
The prior art means that can be used for human body safety check comprise: metal detection, x-ray imaging, active and passive millimeter wave detection etc.
Traditional personnel's safe examination system adopts metal object detection door and Handheld metal detector to carry out the detection of metal contraband goods to human body substantially, and this mode cannot detect the nonmetal contraband goods that concealment is carried, and as drugs, explosive etc., brings hidden danger to security protection.
In recent years, occur that in the world the X ray human body safety check instrument of low radiation dose can be realized the detection to metal and nonmetal target, because it exists radiation hazard to personnel's health, do not accepted by the public, be difficult to promote the use of in daily safety check.
By contrast, millimeter wave detection technology has can penetrate human body clothing, little to human body radiation dosage, realize compared with imaging, can identify the plurality of advantages such as each metalloid and nonmetal contraband goods, along with the development of millimeter-wave technology and the reduction of device cost, in human body safety check, just progressively draw attention nearly ten years.Millimeter wave detection technology can be divided into passive detection and active detection, passive detection technology is to utilize the microwave brightness temperature of object spontaneous radiation, realize the imaging to being observed object by modes such as focal plane arrays (FPA) microwave machine, synthetic synthetic aperture microwave radiometers, there is the problem that imaging precision is not high, systematic observation real-time is poor in current this mode, cannot enter at present practical application.
Active millimeter wave human body security check system, mainly utilizes plane synthetic aperture technique, cylinder synthetic aperture technique.Wherein: the scarce capacity that plane synthetic aperture technique produces 3D hologram stereo-picture, utilizes cylinder synthetic aperture technique to become the developing direction of active millimeter wave human body security check system at present.
The active high speed column of millimeter wave rotation sweep three-dimensional imaging human body security check system has taked the active column synthetic aperture technique of millimeter wave to realize the non-formula safety detection of undressing to personnel to be tested.This safe examination system has been taked the rotation sweep of switch aerial array circumferencial direction machinery drive and the detection mode that vertical direction electricity switched scan combines.
But existing safe examination system is single switch aerial array, the mode that uses single switch arrays antenna to carry out scanning probe to personnel to be tested has extended the sweep time to personnel to be tested, has reduced safety check efficiency.
Summary of the invention
The object of the invention is to provide a kind of human body security check system of system used for millimeter wave active three-dimensional holographic imaging, realizes the fast detecting to personnel to be tested.
The human body security check system of system used for millimeter wave active three-dimensional holographic imaging of the present invention comprises:
There is the cylindrical body framework of gateway, form the first scanning area, the second scanning area and region to be scanned;
The first millimeter wave transceiver and the second millimeter wave transceiver;
The the first millimeter wave switch aerial array being connected with described the first millimeter wave transceiver, with the second millimeter wave switch aerial array being connected with described the second millimeter wave transceiver;
Rotation sweep drive unit, for driving described the first millimeter wave switch aerial array and described the second millimeter wave switch aerial array subtend rotation;
Control device, for controlling rotation sweep drive unit and the first and second millimeter wave transceivers, make the first and second millimeter wave switch aerial arrays respectively in the first and second scanning areas to the described region to be scanned cylinder rotation sweep that walks abreast; And
Parallel image treating apparatus, the 3D hologram image for basis from the image data of the first and second millimeter wave transceivers and the synthetic personnel to be tested of the spatial positional information of this image data.
Further, described rotation sweep drive unit comprises two symmetrically arranged swivel arms, and described the first millimeter wave switch aerial array and the second millimeter wave switch aerial array are separately positioned on described swivel arm.
Further, described rotation sweep drive unit comprises grating angle information output unit, for exporting the rotation angle information of described the first and second millimeter wave switch aerial arrays.
Further, the rotating range of described the first millimeter wave switch aerial array and described the second millimeter wave switch aerial array subtend rotation is 120 degree.
Further, described the first and second millimeter wave transceivers comprise respectively timing control unit, described millimeter wave switch arrays antenna is determined the column scan position on horizontal circumference direction of scanning by described grating angle information output unit, and the scanning realizing in vertical sweep direction by described timing control unit is switched.
Further, millimeter wave switch aerial array comprises multiple receiving antennas unit and corresponding multiple transmission antenna unit, and receiving antenna unit and transmission antenna unit apportion are staggered, and uniformly-spaced arrange between each antenna element.
Further, described antenna is electromagnetic horn and/or dielectric rod antenna, and described switch is that hilted broadsword is thrown stacked combination form for the switching to antenna element more.
Further, each millimeter wave transceiver provides step frequency continuous wave to corresponding millimeter wave switch aerial array, and operating frequency range is 12 to 50GHz.
On the other hand, the present invention also provides a kind of scan method of human body security check system of system used for millimeter wave active three-dimensional holographic imaging.The method comprises: described rotation sweep drive unit under the control of control device, drive described the first millimeter wave switch aerial array and the second millimeter wave switch aerial array respectively in the first scanning area and the second scanning area parallel subtend rotation treat scanning area and carry out cylinder rotation sweep, parallel image treating apparatus is according to the 3D hologram image from the image data of the first and second millimeter wave transceivers and the synthetic personnel to be tested of the spatial positional information of this image data.
Further, the receiving antenna unit in described millimeter wave switch aerial array and the transmission antenna unit transmitting-receiving that interlocks.
On the other hand, the human body security check system of system used for millimeter wave active three-dimensional holographic imaging of the present invention adopts frequency division scan mode and an empty point scan mode to scan personnel to be tested.
Described frequency division mode is in scan period, and the frequency of operation of the detectable signal providing with the second millimeter wave transceiver that synchronization the first millimeter wave transceiver provides is different.
Further, in scan period, the frequency of operation of the detectable signal providing with the second millimeter wave transceiver that synchronization the first millimeter wave transceiver provides has equal difference on the frequency.
Further, the first millimeter wave transceiver and the second millimeter wave transceiver provide respectively step frequency continuous wave detectable signal.
Further, in scan period, the frequency of operation of the detectable signal providing with the second millimeter wave transceiver that synchronization the first millimeter wave transceiver provides differs 50MHz.
It is in scan period that described sky divides mode scan method, and in arbitrary moment first millimeter wave switch aerial array and the second millimeter wave switch aerial array, the detection of antenna element is highly different.
Further, in whole scan period, described detection height position keeps identical difference.
Further, an empty point mode scan method comprises:
Respectively the first millimeter wave switch aerial array is equally divided into first the first half and first the latter half, the second millimeter wave switch aerial array is equally divided into second the first half and second the latter half;
The first millimeter wave switch aerial array is scanned up to last antenna element of described first the first half downwards from first antenna element of described first the first half, meanwhile, the second millimeter wave switch aerial array is scanned up to last antenna element of described second the latter half downwards from first antenna element of described second the latter half; And
The first millimeter wave switch aerial array is scanned up to last antenna element of described first the latter half downwards from first antenna element of described first the latter half, meanwhile, the second millimeter wave switch aerial array is scanned up to last antenna element of described second the first half downwards from first antenna element of described second the first half.
Or an empty point mode scan method comprises:
Respectively the first millimeter wave switch aerial array is equally divided into first the first half and first the latter half, the second millimeter wave switch aerial array is equally divided into second the first half and second the latter half;
The first millimeter wave switch aerial array is scanned up to last antenna element of described first the latter half downwards from first antenna element of described first the latter half, meanwhile, the second millimeter wave switch aerial array is scanned up to last antenna element of described second the first half downwards from first antenna element of described second the first half; And
The first millimeter wave switch aerial array is scanned up to last antenna element of described first the first half downwards from first antenna element of described first the first half, meanwhile, the second millimeter wave switch aerial array is scanned up to last antenna element of described second the latter half downwards from first antenna element of described second the latter half.
Or the scan method of empty point mode comprises:
Respectively the first millimeter wave switch aerial array is equally divided into first the first half and first the latter half, the second millimeter wave switch aerial array is equally divided into second the first half and second the latter half;
The first millimeter wave switch aerial array is upwards scanned up to first antenna element of described first the first half from last antenna element of described first the first half, meanwhile, the second millimeter wave switch aerial array is upwards scanned up to first antenna element of described second the latter half from last antenna element of described second the latter half; And
The first millimeter wave switch aerial array is upwards scanned up to first antenna element of described first the latter half from last antenna element of described first the latter half, meanwhile, the second millimeter wave switch aerial array is upwards scanned up to first antenna element of described second the first half from last antenna element of described second the first half.
Or an empty point mode scan method comprises: respectively the first millimeter wave switch aerial array is equally divided into first the first half and first the latter half, the second millimeter wave switch aerial array is equally divided into second the first half and second the latter half;
The first millimeter wave switch aerial array is upwards scanned up to first antenna element of described first the latter half from last antenna element of described first the latter half, meanwhile, the second millimeter wave switch aerial array is upwards scanned up to first antenna element of described second the first half from last antenna element of described second the first half; And
The first millimeter wave switch aerial array is upwards scanned up to first antenna element of described first the first half from last antenna element of described first the first half, meanwhile, the second millimeter wave switch aerial array is upwards scanned up to first antenna element of described second the latter half from last antenna element of described second the latter half.
The present invention also can be combined with frequency division mode scan method and an empty point mode scan method.
The invention has the advantages that:
The three-dimensional column scanning safe examination system of the through type structure 1, adopting, can be positioned over security check passage critical point, and personnel to be tested can come into safety check region straight, to improve safety check efficiency.
2, by adopting the mode of two millimeter wave transceivers and the concurrent working of millimeter wave switch aerial array, compare with the form of millimeter wave array antenna with a millimeter wave transceiver of employing, can greatly shorten the safety check time, avoid human body during long scanning probe, to occur wobble effects image quality.
3, treat by adopting the interleaving detection technology between array antenna Transmit-Receive Unit, can improving the precision that scanning area vertical direction wave beam is surveyed, imaging results is doubled in the resolution of vertical direction.
4, adopt the high-precision rotary scanning driving device that can export rotation angle information, can accurately obtain the angle position of millimeter array antenna in horizontal circumference direction rotation scanning, with the detection accuracy of the circumferencial direction rotation sweep of improving the standard.
5, while making millimeter wave switch aerial array subtend parallel scan by frequency division, an empty point technology, avoid subtend radiation interference, improved imaging definition level.
Brief description of the drawings
Below with reference to accompanying drawings and in conjunction with the embodiments the present invention is specifically described.
Fig. 1 is the main block diagram of the human body security check system of system used for millimeter wave active three-dimensional holographic imaging of the present invention;
Fig. 2 is the top view of system of the present invention;
Fig. 3 is the millimeter wave transceiver composition of system of the present invention and the work relationship figure with miscellaneous part;
Fig. 4 is the millimeter wave switch antenna array structure schematic diagram of system of the present invention;
Fig. 5 be the rotation sweep drive unit composition of system of the present invention and with miscellaneous part work relationship figure;
Fig. 6 is working-flow figure;
Fig. 7 is that system diagram picture is processed basic flow sheet;
Fig. 8 is empty point mode technical schematic diagram.
Embodiment
With reference to the accompanying drawings and by embodiments of the invention, technical scheme of the present invention is described in detail.Should be appreciated that shown in accompanying drawing, each component is schematic and nonrestrictive, each feature draws not in scale.In each device accompanying drawing, identical Reference numeral represents identical component.
As illustrated in fig. 1 and 2, the human body security check system of system used for millimeter wave active three-dimensional holographic imaging of the present invention comprises the first millimeter wave switch aerial array 7 that columned main body frame 1, manipulation computing machine 13, control device 4, the first millimeter wave transceiver 2 are connected with the second millimeter wave transceiver 3, with the first millimeter wave transceiver 2 and the second millimeter wave switch aerial array 8, the rotation sweep drive unit 6 that can produce rotation angle information and the parallel image treating apparatus 5 being connected with the second millimeter wave transceiver 3.This safe examination system is through type structure, and columned main body frame 1 is provided with entrance 11 and outlet 12, and main body frame 1 inner formation region 15 to be scanned forms the first symmetrical scanning area 9 and the second scanning area 10 between entrance 11 and outlet 12.Main body frame 1 top is provided with rotation sweep drive unit 6, as shown in Figure 5, this rotation sweep drive unit 6 comprises motor 30, wheel box 31, also comprises that two symmetrically arranged swivel arms 32 are for fixing respectively millimeter wave transceiver and millimeter wave switch aerial array.In the present embodiment, the first millimeter wave transceiver 2, the first millimeter wave switch aerial array 7 are suspended on the swivel arm of a side wherein, and the second millimeter wave transceiver 3, the second millimeter wave switch aerial array 8 are suspended on the swivel arm of opposite side.The first and second scanning areas adopt closed transparent safeguard structure respectively the swivel arm that is fixed with millimeter wave switch aerial array to be sealed wherein.After personnel to be tested 14 is entered by entrance 11, center in region 15 to be scanned stands still, security staff is by the 13 trigger sweep instructions of manipulation computing machine, rotation sweep drive unit 6 drive installation under the control of control device 4, in millimeter wave transceiver 2 and 3, the millimeter wave switch aerial array 7 and 8 of swivel arm, is treated the parallel cylinder rotation sweep of scanning area 15 in two scanning areas 9 and 10 of the safe examination system main body frame that is placed in.Complete after scanning, personnel to be tested leaves by exporting 12.
The first millimeter wave switch aerial array 7 and the second millimeter wave switch aerial array 8 are driven by described rotation sweep drive unit 6, carry out subtend rotation respectively along the first scanning area 9 and the second scanning area 10, and each swivel arm slewing area is for example 120 degree.Because the lobe that the detectable signal of each antenna element institute radiation of millimeter wave switch aerial array forms is enough to the space of surrounding's 360 degree that cover personnel to be measured, therefore both sides millimeter wave switch aerial array parallel scan simultaneously, carries out 360 degree circular scans compared with single millimeter wave switch aerial array and can greatly shorten sweep time.
As shown in Figure 5, rotation sweep drive unit 6 also comprises grating angle information output unit 33.Grating angle information output unit 33 is to utilize grating to determine the column scan switching position on horizontal circumferencial direction, provides angular position information to control device 4, thereby definite antenna is vertical and the work schedule of horizontal circumferencial direction millimeter wave detection wave beam.
Millimeter wave transceiver provides step frequency continuous wave to millimeter wave switch aerial array.The step frequency continuous wave is here continuous and the ripple of frequency step.Typical operating frequency range is 12 to 50GHz, interval between Frequency point is that step value is determined according to target area scope, such as 50MHz, 100MHz or 200MHz etc., export the detectable signal of the continuous wave of tens of nanosecond time span at each frequency millimeter wave transceiver.Shown in Fig. 3, millimeter wave transceiver comprises: high stability crystal oscillator 16, first frequency synthesizer 17 and second frequency synthesizer 20, the first converter unit 18 and the second converter unit 21, the first directional coupler 19 and the second directional coupler 22, the first frequency mixer 23 and the second frequency mixer 24, quadrature demodulator 25, data acquisition unit 26 and timing control unit 27.Wherein, first frequency synthesizer 17 and second frequency synthesizer 20 have tens of nanosecond frequency agility rate speed, and the present invention can use Direct Digital Frequency Synthesizers (DDS) or voltage controlled oscillator (VCO); Data acquisition unit 26 for example utilizes the collection of AD acquisition mode.
High stability crystal oscillator 16 output reference time signals a point two-way offer respectively first frequency synthesizer 17 and second frequency synthesizer 20, export emission detection baseband signal by first frequency synthesizer 17, export with reference to baseband signal by second frequency synthesizer 20.Emission detection baseband signal becomes the emission detection signal of millimeter wave band after the first converter unit 18 frequency conversions; After the second converter unit 21 frequency conversions, become the reference signal of millimeter wave band with reference to baseband signal.Emission detection signal is divided into again two-way through the first directional coupler 19, and reference signal is also divided into two-way through the second directional coupler 22.The first via signal of emission detection signal sends the transmission channel of millimeter wave switch aerial array to for the detection of a target, and the second road signal of emission detection signal and the second road signal of reference signal are used as and receive with reference to baseband signal through the second frequency mixer 24 mixing.The first via of reference signal is used as receiving baseband signal with the reception signal of the receiving cable from millimeter wave switch aerial array through the first frequency mixer 23 phase mixing.Receive with reference to baseband signal and receiving baseband signal and pass through quadrature demodulator 25 demodulation, and gather by data acquisition unit 26, obtain to personnel to be tested's step frequency probing wave amplitude and the phase information under each Frequency point.All parts are controlled by the timing control unit 27 of millimeter wave transceiver inside above, thereby the scanning realizing on vertical direction is switched.
The transmission channel of the millimeter wave switch aerial array mentioned herein refers to transmission antenna unit, and receiving cable refers to receiving antenna unit, describes in detail and refers to below.
As shown in Figure 4, millimeter wave switch aerial array is made up of multiple antenna elements, comprises transmission antenna unit 28 for transmitting and for receiving the receiving antenna unit 29 of signal.Millimeter wave switch aerial array is bistatic, transmission antenna unit 28 (being called for short bill unit) and receiving antenna unit 29 (be called for short and receive unit) are arranged according to the staggered order of transmitting-receiving, and uniformly-spaced arrange between each antenna element, be uniformly-spaced to arrange between bill unit, receive between unit and uniformly-spaced arrange, uniformly-spaced staggered between bill unit and receipts unit.
The form of antenna comprises electromagnetic horn and/or dielectric rod antenna form.Control by the alternating expression transmitting-receiving of sending out, receiving antenna element, can realize the high density detecting beam scanning for the treatment of scanning area 15 vertical directions.
Switch in millimeter wave switch aerial array is that hilted broadsword is thrown stacked combination form more, if typical 256 cell arrays are by 32 one-level hilted broadsword eight throw switches, 4 secondary hilted broadsword eight throw switches and 1 three grades of hilted broadswords, four throw switch form, and the antenna element that completes aerial array in the vertical direction switches.
In safe examination system of the present invention, as shown in Figure 6, process is as follows for the work schedule of safety check process:
Step 1, after S35, system power-up, each several part completes self-inspection in system, if any fault S36, by manipulation computing machine 13 display system failure messages maintenance, as non-fault enters step 2.
Step 2, carries out system calibration.S37, by manipulation computing machine trigger calibration command.S38, millimeter wave transceiver carry out frequency of operation calibration, millimeter wave switch aerial array carries out each transceiver channel amplitude and phase alignment.S39, determine above-mentioned calibration data and be recorded in the parallel image treating apparatus 5 of system.
Step 3, system enters safety check scanning work state, after personnel to be tested 14 is entered by system entry 11, vertically stands still in region to be scanned 15 central authorities.S40, by security staff by manipulation computing machine 13 trigger sweep instructions.S41, rotation sweep drive unit 6 drives and is arranged on first on swivel arm 32 under the control of control device 4, two millimeter wave transceivers, first, two millimeter wave switch aerial arrays, at first of the safe examination system main body frame that is placed in, in two scanning areas, treat the cylinder rotation sweep of scanning area 15, the column scan switching position that millimeter wave switch aerial array is determined on horizontal circumferencial direction by the grating angle information output unit 33 of rotation sweep drive unit 6, the scanning realizing in vertical sweep direction by the timing control unit 27 of millimeter wave transceiver is switched.The scan-data of each antenna element that the data acquisition unit 26 in millimeter wave transceiver gathers in probing wave amplitude and the phase information of each locus and frequency, sends into parallel image treating apparatus 5.S42, parallel image treating apparatus 5 utilize the system calibration data that obtain in S39, to the personnel to be tested's 14 who collects in S41 scan-data process, image shows and dangerous suspicious object identification and indicating.
The typical implementation procedure of S42 as shown in Figure 7, comprise: S44, cylinder two-dimensional fast fourier transform (" Fast Fourier Transform (FFT) " is called for short FFT), S45, cylinder deconvolution (one dimension FFT), S46, polar coordinates-rectangular coordinate interpolation, S47, three-dimensional Fast Fourier Transform Inverse (FFTI) (IFFT).And then export typical active millimeter wave 3D hologram gray level image as shown in Figure 8 by imaging, and complete the dangerous suspicious object identification on it and indicate.
Step 4, prompting calibration.System to personnel to be tested's continuous firing a period of time after, step S43, according to default prompt system need calibration, as determine need calibration, return to step 2, after calibration process completes, system reenters the safety check state to personnel to be tested.If do not needed, return to step 3, proceed safety check.
In addition, native system breaks down in above arbitrary steps, step 34, trigger replacement (reset) and order and enter the System self-test of step 1 by manipulation computing machine 13.
By safe examination system being designed to channel-type structure, take the mode of two row switch aerial array subtend rotation sweep concurrent workings, reduce switch aerial array angle rotating range, shorten rotation sweep detection time more than one times, avoid human body during long scanning probe, to occur wobble effects image quality.But due to two row subtend antenna distances near (in basic 1m), adopt column synthetic aperture technique to carry out the antenna beam wider (30～60 degree) of near field detection, and adopt the working method work of step frequency continuous wave, will cause subtend between two array antenna arrays to disturb larger.
According to a preferred embodiment of the present invention, the first millimeter wave switch aerial array and the second millimeter wave switch aerial array adopt frequency division concurrent working mode, in scan period, the frequency of operation of the detectable signal that the detectable signal that arbitrary moment first millimeter wave transceiver 2 provides and the second millimeter wave transceiver 3 provide keeps difference during whole rotation sweep, keeps equal difference on the frequency between the frequency of operation of two millimeter wave transceivers.Because adopting step frequency continuous wave, the millimeter wave transceiver of system of the present invention carries out detection scanning, and the first millimeter wave transceiver 2 and the second millimeter wave transceiver 3 all adopt identical frequency steps long value, as 0.1GHz, therefore the frequency of operation of the step frequency continuous wave of the frequency of operation of the step frequency continuous wave of the first millimeter wave transceiver 2 and the second millimeter wave transceiver 3 is uniformly-spaced staggered, as the working frequency points representative value of the first millimeter wave transceiver 2 is: 30GHz, 30.1GHz, 30.2GHz, 30.3GHz, 39.9GHz, 40GHz, the working frequency points representative value of the second millimeter wave transceiver 3 is: 30.05GHz, 30.15GHz, 30.25GHz, 38.5GHz, 39.5GHz, frequency phase-difference between each frequency remains 50MHz, make the first millimeter wave switch aerial array 7 and the first millimeter wave switch aerial array 8 respectively the frequency of the detectable signal of radiation during whole rotation sweep, all keep equal difference so that the concurrent working as far as possible without interfering with each other each other of two-sided array antenna.
According to a further advantageous embodiment of the invention, it is parallel that the first millimeter wave switch aerial array and the second millimeter wave switch aerial array can adopt empty point mode.In scan period, in arbitrary moment first millimeter wave switch aerial array 7 and the second millimeter wave switch aerial array 8, the detection of antenna element highly keeps difference, and subtend parallel scan remains identical difference in height between position.Concrete grammar is: as shown in Figure 8, for each millimeter wave switch aerial array, can be divided into upper and lower two parts, , the first millimeter wave switch aerial array 7 is equally divided into first the first half 81 and first the latter half 82, the second millimeter wave switch aerial array 8 is equally divided into second the first half 83 and second the latter half 84, if the number separately with antenna element of the first millimeter wave switch aerial array 7 and the first millimeter wave switch aerial array 8 is 256, first the first half 81 of the first millimeter wave switch aerial array 7, first the latter half 82, second the first half 83 of the second millimeter wave switch aerial array 8 and the antenna element number of second the latter half 84 are 128, i.e. the 128th antenna element from the 1st antenna element of top side to lower side.
Work schedule for example can arrange like this: first the first half 81 of the first millimeter wave switch aerial array 7 is for the 1st antenna element from top side is progressively to the 128th antenna element scanning probe of this part, simultaneously second the latter half 84 of the second millimeter wave switch aerial array 8 from the 1st antenna element of its top side progressively to the 128th antenna element scanning probe of this part.Then first the latter half 82 of the first millimeter wave switch aerial array 7 from the 1st antenna element of top side progressively to the 128th antenna element scanning probe of this part, simultaneously second the first half 83 of the second millimeter wave switch aerial array 8 from the 1st antenna element of its top side progressively to the 128th antenna element scanning probe of this part.
Or, first the latter half 82 of the first millimeter wave switch aerial array 7 be from the 1st antenna element of top side progressively to the 128th antenna element scanning probe of this part, simultaneously second the first half 83 of the second millimeter wave switch aerial array 8 from the 1st antenna element of its top side progressively to the 128th antenna element scanning probe of this part.Then first the first half 81 of the first millimeter wave switch aerial array 7 from the 1st antenna element of top side progressively to the 128th antenna element scanning probe of this part, simultaneously second the latter half 84 of the second millimeter wave switch aerial array 8 from the 1st antenna element of its top side progressively to the 128th antenna element scanning probe of this part.
Or, first the first half 81 of the first millimeter wave switch aerial array 7 be from the 128th antenna element of lower side progressively to the 1st antenna element scanning probe of this part, simultaneously second the latter half 84 of the second millimeter wave switch aerial array 8 from the 128th antenna element of its lower side progressively to the 1st antenna element scanning probe of this part.Then first the latter half 82 of the first millimeter wave switch aerial array 7 from the 128th antenna element of lower side progressively to the 1st antenna element scanning probe of this part, simultaneously second the first half 83 of the second millimeter wave switch aerial array 8 from the 128th antenna element of its lower side progressively to the 1st antenna element scanning probe of this part.
Or, first the latter half 82 of the first millimeter wave switch aerial array 7 be from the 128th antenna element of lower side progressively to the 1st antenna element scanning probe of this part, simultaneously second the first half 83 of the second millimeter wave switch aerial array 8 from the 128th antenna element of its lower side progressively to the 1st antenna element scanning probe of this part.Then first the first half 81 of the first millimeter wave switch aerial array 7 from the 128th antenna element of lower side progressively to the 1st antenna element scanning probe of this part, simultaneously second the latter half 84 of the second millimeter wave switch aerial array 8 from the 128th antenna element of its lower side progressively to the 1st antenna element scanning probe of this part.
Like this if both sides in the time carrying out scanning probe, it is surveyed and highly differs the height that remains 128 antenna elements and just can avoid subtend interference, the antenna element that the millimeter wave switch aerial array of both sides is worked at any one time separately does not spatially occur that antenna lobe is overlapping, makes the concurrent working as far as possible without interfering with each other each other of two-sided array antenna.
The present invention can adopt separately frequency division mode, empty point mode, also the two can be combined with, and the imaging definition level of system is improved.
The embodiment of the above and described case study on implementation; for one of case study on implementation of the present invention; not limit practical range of the present invention with this, therefore the equivalence that all shapes according to patent of the present invention, structure and Principle Method do changes, all should be encompassed in the protection domain of patent of the present invention.Should be appreciated that the above detailed description of technical scheme of the present invention being carried out by preferred embodiment is illustrative and not restrictive.Those of ordinary skill in the art modifies reading the technical scheme that can record each embodiment on the basis of instructions of the present invention, or part technical characterictic is wherein equal to replacement; And these amendments or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.Protection scope of the present invention is only limited by the claims of enclosing.
Claims (10)
1. human body security check system utilizes a scan method for the empty point technology of frequency division, and this system comprises:
There is the cylindrical body framework of gateway, form the first scanning area (9), the second scanning area (10) and region to be scanned (15);
The first millimeter wave transceiver (2) and the second millimeter wave transceiver (3);
The the first millimeter wave switch aerial array (7) being connected with described the first millimeter wave transceiver (2), with the second millimeter wave switch aerial array (8) being connected with described the second millimeter wave transceiver (3);
Rotation sweep drive unit (6), for driving described the first millimeter wave switch aerial array (7) and described the second millimeter wave switch aerial array (8) subtend rotation;
Control device (4), be used for controlling rotation sweep drive unit and the first and second millimeter wave transceivers (2,3) make the first and second millimeter wave switch aerial arrays (7,8) respectively in the first and second scanning areas (9,10) to described region to be scanned (15) the cylinder rotation sweep that walks abreast; And
Parallel image treating apparatus, the 3D hologram image for basis from the image data of the first and second millimeter wave transceivers and the synthetic personnel to be tested of the spatial positional information of this image data,
It is characterized in that, the method comprises,
In scan period, the frequency of operation of the detectable signal providing with the second millimeter wave transceiver that synchronization the first millimeter wave transceiver provides is different; And,
In scan period, in arbitrary moment first millimeter wave switch aerial array and the second millimeter wave switch aerial array, the detection of antenna element is highly different.
2. human body security check system according to claim 1 utilizes the scan method of the empty point technology of frequency division, it is characterized in that,
In scan period, the frequency of operation of the detectable signal that the frequency of operation of the detectable signal that synchronization the first millimeter wave transceiver provides and the second millimeter wave transceiver provide has equal difference on the frequency; And,
In whole scan period, described detection height position keeps identical difference.
3. human body security check system according to claim 2 utilizes the scan method of the empty point technology of frequency division, it is characterized in that, the first millimeter wave switch aerial array is equally divided into first the first half and first the latter half, the second millimeter wave switch aerial array is equally divided into second the first half and second the latter half
The first millimeter wave transceiver and the second millimeter wave transceiver provide respectively step frequency continuous wave detectable signal; And,
The method further comprises:
The first millimeter wave switch aerial array is scanned up to last antenna element of described first the first half downwards from first antenna element of described first the first half, meanwhile, the second millimeter wave switch aerial array is scanned up to last antenna element of described second the latter half downwards from first antenna element of described second the latter half;
The first millimeter wave switch aerial array is scanned up to last antenna element of described first the latter half downwards from first antenna element of described first the latter half, meanwhile, the second millimeter wave switch aerial array is scanned up to last antenna element of described second the first half downwards from first antenna element of described second the first half.
4. human body security check system according to claim 2 utilizes the scan method of the empty point technology of frequency division, it is characterized in that, the first millimeter wave switch aerial array is equally divided into first the first half and first the latter half, the second millimeter wave switch aerial array is equally divided into second the first half and second the latter half
The first millimeter wave transceiver and the second millimeter wave transceiver provide respectively step frequency continuous wave detectable signal; And,
The method further comprises:
The first millimeter wave switch aerial array is scanned up to last antenna element of described first the latter half downwards from first antenna element of described first the latter half, meanwhile, the second millimeter wave switch aerial array is scanned up to last antenna element of described second the first half downwards from first antenna element of described second the first half;
The first millimeter wave switch aerial array is scanned up to last antenna element of described first the first half downwards from first antenna element of described first the first half, meanwhile, the second millimeter wave switch aerial array is scanned up to last antenna element of described second the latter half downwards from first antenna element of described second the latter half.
5. human body security check system according to claim 2 utilizes the scan method of the empty point technology of frequency division, it is characterized in that, the first millimeter wave switch aerial array is equally divided into first the first half and first the latter half, the second millimeter wave switch aerial array is equally divided into second the first half and second the latter half
The first millimeter wave transceiver and the second millimeter wave transceiver provide respectively step frequency continuous wave detectable signal; And,
The method further comprises:
The first millimeter wave switch aerial array is upwards scanned up to first antenna element of described first the first half from last antenna element of described first the first half, meanwhile, the second millimeter wave switch aerial array is upwards scanned up to first antenna element of described second the latter half from last antenna element of described second the latter half;
The first millimeter wave switch aerial array is upwards scanned up to first antenna element of described first the latter half from last antenna element of described first the latter half, meanwhile, the second millimeter wave switch aerial array is upwards scanned up to first antenna element of described second the first half from last antenna element of described second the first half.
6. human body security check system according to claim 2 utilizes the scan method of the empty point technology of frequency division, it is characterized in that, the first millimeter wave switch aerial array is equally divided into first the first half and first the latter half, the second millimeter wave switch aerial array is equally divided into second the first half and second the latter half
The first millimeter wave transceiver and the second millimeter wave transceiver provide respectively step frequency continuous wave detectable signal; And,
The method further comprises:
The first millimeter wave switch aerial array is upwards scanned up to first antenna element of described first the latter half from last antenna element of described first the latter half, meanwhile, the second millimeter wave switch aerial array is upwards scanned up to first antenna element of described second the first half from last antenna element of described second the first half;
The first millimeter wave switch aerial array is upwards scanned up to first antenna element of described first the first half from last antenna element of described first the first half, meanwhile, the second millimeter wave switch aerial array is upwards scanned up to first antenna element of described second the latter half from last antenna element of described second the latter half.
7. the scan method of utilizing the empty point technology of frequency division according to the human body security check system described in any one of claim 3 to 6, is characterized in that,
Described rotation sweep drive unit (6) comprises grating angle information output unit (33), for exporting the rotation angle information of described the first and second millimeter wave switch aerial arrays (7,8).
8. the scan method of utilizing the empty point technology of frequency division according to the human body security check system described in any one of claim 3 to 6, is characterized in that,
The rotating range of described the first millimeter wave switch aerial array (7) and described the second millimeter wave switch aerial array (8) subtend rotation is 120 degree.
9. human body security check system according to claim 7 utilizes the scan method of the empty point technology of frequency division, it is characterized in that,
Described the first and second millimeter wave transceivers comprise respectively timing control unit (27), described millimeter wave switch aerial array is determined the column scan position on horizontal circumference direction of scanning by described grating angle information output unit (33), and the scanning realizing in vertical sweep direction by described timing control unit (27) is switched.
10. utilize the scan method of the empty point technology of frequency division according to the human body security check system described in any one of claim 3 to 6, it is characterized in that, described millimeter wave switch aerial array comprises multiple receiving antennas unit and corresponding multiple transmission antenna unit, receiving antenna unit and transmission antenna unit apportion are staggered, and between each antenna element, uniformly-spaced arrange, the transmitting-receiving that interlocks of described receiving antenna unit and transmission antenna unit.
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