CN108519623A - Foreign body detecting system based on millimetre-wave radar - Google Patents
Foreign body detecting system based on millimetre-wave radar Download PDFInfo
- Publication number
- CN108519623A CN108519623A CN201810329843.4A CN201810329843A CN108519623A CN 108519623 A CN108519623 A CN 108519623A CN 201810329843 A CN201810329843 A CN 201810329843A CN 108519623 A CN108519623 A CN 108519623A
- Authority
- CN
- China
- Prior art keywords
- signal
- frequency
- power amplifier
- power
- antenna
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- G01S13/90—Radar or analogous systems specially adapted for specific applications for mapping or imaging using synthetic aperture techniques, e.g. synthetic aperture radar [SAR] techniques
- G01S13/904—SAR modes
- G01S13/9088—Circular SAR [CSAR, C-SAR]
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/12—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with electromagnetic waves
-
- 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
-
- 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
- G01S13/90—Radar or analogous systems specially adapted for specific applications for mapping or imaging using synthetic aperture techniques, e.g. synthetic aperture radar [SAR] techniques
Abstract
The present invention discloses a kind of foreign body detecting system based on millimetre-wave radar comprising：Millimeter wave transceiving module, antenna array module, digital collection module and image reconstruction module, digital collection module receive the signal of millimeter wave transceiving module output and handle it；Image reconstruction module receives the signal of digital collection module output, and fast imaging processing is carried out to it, to obtain the realtime graphic of tested scene.The present invention is through the above scheme, develop a kind of foreign body detecting system of quick, high-resolution millimetre-wave radar, the entrance that the system can be positioned over the important places such as airport, harbour carries out safety inspection, can to hide on the person metal dangerous material (such as cutter, rifle have) and ceramics dangerous material (such as explosive) accurately detected.The present invention is designed by transceiver to millimeter wave transceiving module and switching group and antenna array module, reaches optimum performance.
Description
Technical field
The present invention relates to safe examination system fields, are the millimeter wave hologram monitor radar systems for security protection purposes specifically
System, to assist the safety check to concealed weapons.
Background technology
Currently, the conventional concealed weapons detecting devices of important place has metal magnetic survey meter (including detector bar and detection
Door), X-ray survey meter.Wherein, metal magnetic survey meter can only detect metal, to cannot be to ceramic or modeling
The potential dangers product such as material explosive are detected, therefore there are prodigious security risks；Secondly, operating distance is short, needs to be visited
At a distance from survey person and instrument are spaced closely together, this can bring uncomfortable feeling to those who are investigated；Again, metal detector is letter
Single detection metal, cannot be to real hazardous metals product (such as pistol, cutter) and common metal article (such as button, trousers
Head, coin etc.) it distinguishes, therefore there is very high false-alarm probability.Therefore, very using the safety check efficiency of metal magnetic survey meter
It is low, it is difficult to meet the demand of increasingly heavier safety check task.X-ray survey meter is mainly used to carry passenger at present
Sorte Nula detected, although low-power to people carry out safety check X-ray survey meter be developed and a small amount of
Airport is used, but since X-ray is to the damaging effect of human body, or is difficult generally to be received by the public.
For the defect of current conventional rays safety detection apparatus, people begin one's study a kind of new foreign body detecting system, i.e. millimeter wave
Radar foreign body detecting system.It utilizes military to the strong penetrability and human body and metal or nonmetallic system of dry clothing using millimeter wave
Device millimere-wave band reflection characteristic powerful contrast and advanced three-dimensional radar imaging technique to human body carry out it is three-dimensional in real time at
Picture quickly and accurately can carry out safety inspection to human body.In addition, millimeter-wave radiation is non-ionized, the millimeter of mid power
Wave radiation will not damage health；Millimetre wavelength is relatively short (1~10mm), and system can be in smaller body
Product is lower to realize higher resolution ratio.In short, millimetre-wave radar foreign body detecting system is as a kind of novel contactless quick peace
Equipment is examined, can solve the problems, such as current conventional rays safety detection apparatus, it is huge by having in the struggle against terror of countries in the world
Application prospect.
Invention content
The brief overview about the embodiment of the present invention is given below, in order to provide about certain aspects of the invention
Basic comprehension.It should be appreciated that outlined below is not the exhaustive general introduction about the present invention.It is not intended to determine this hair
Bright key or pith, nor is it intended to limit the scope of the present invention.Its purpose only provides certain in simplified form
A little concepts, in this, as the preamble in greater detail discussed later.
According to the one side of the application, a kind of foreign body detecting system based on millimetre-wave radar is provided, including：
Millimeter wave transceiving module, including switching group, transceiver and Frequency Synthesizer (or frequency synthesizer, frequency source)；It opens
Pass group includes that the emission switch group of multiple launching electronics switch compositions and the reception being made of multiple reception electronic switches switch
Group；Frequency Synthesizer, the step frequency signal needed for generation system；Transceiver, for generating the milli for being sent to safety check object
Decimetric emission signal and the scatter echo signal for receiving and handling safety check object；
Antenna array module is connect with millimeter wave transceiving module, is scattered back for sending millimeter wave transmitting signal and reception
Wave signal；Antenna array module includes transmitting antenna array and receiving antenna array, and transmitting antenna array includes N number of transmitting day
Line, receiving antenna array include N number of reception antenna, and N number of transmitting antenna of transmitting antenna array and the N number of of receiving antenna array connect
Antenna is received to correspond；The antenna array module switchs or receives electronics in vertical direction by switching the launching electronics of switching group
Switch, artificial antenna vertical movement realize that synthetic aperture measures, and in direction of rotation by servo mechanism, machine is carried out to aerial array
Tool scanning realizes that synthetic aperture measures；
Digital collection module receives the signal of millimeter wave transceiving module output and handles it；
Image reconstruction module, receive digital collection module output signal, fast imaging processing is carried out to it, with obtain by
Survey the realtime graphic of scene.
Further, the antenna array module and millimeter wave transceiving module are fixed on a fast mechanical scan equipment
On, this allows entire imaging data to be acquired in 2 seconds.In each scanning process, each channel is using quickly electricity
Sub switch switches over, and obtains the data of each angle, to collect the data in complete two-dimentional aperture.
According to the one side of the application, system uses Ka wave band design schemes：
Antenna array module includes the transmitting antenna array being made of 64 transmitting antennas and is made of 64 reception antennas
Receiving antenna array；The length of antenna array module is 0.5m, and rotation angle needs 60 °, adjacent transmission antenna or adjacent
It is longitudinally spaced for 8mm between reception antenna；The antenna lateral separation of adjacent transmission antenna or adjacent reception antenna<8mm.It is excellent
Choosing, it, can to ensure that the directional diagram of every antenna in array element can cover the imaging region of 2 meters of (height) × 1 meter (width)
The X-direction half-power beam width for acquiring transmitting antenna or reception antenna at least needs 122 °, the Half Power Beamwidth of Z-direction
Degree at least needs 136 °.
Radar signal of the millimeter wave transceiving module for emitting and receiving broadband in order, and signal will be received by putting
Greatly, filtering is transmitted to digital module and is acquired with after down-converted.It includes switching group, transceiver and Frequency Synthesizer.
Wherein, it is contemplated that changed power ranging from 12dB of the operating distance (0.5~1m) in radar equation, and by target
RCS variation ranges be thought of as 3dB, then the Power Dynamic Range of receiver front end needs 15dB.So, transceiver designs such as
Under：It includes the first oscillator, the first power splitter, the first power amplifier, the 10th frequency multiplier, the second power amplifier,
Two oscillators, delayer, the second power splitter, third power amplifier, the first frequency mixer, the 4th power amplifier, nine frequency multipliers,
First bandpass filter, the 5th power amplifier, the second frequency mixer, the 20th frequency multiplier, third frequency mixer, the second bandpass filtering
Device, the 6th power amplifier, third bandpass filter, the 7th power amplifier and the 8th power amplifier；First oscillator,
One power splitter, the first power amplifier, the 10th frequency multiplier, the second power amplifier are sequentially connected with, the first oscillator output the
The oscillator signal of one frequency range (2.7-3.3GHz frequency ranges), and it is sent to the first power splitter；First power amplifier connects
It receives the power signal of the first power splitter output and it is amplified to reach the driving power range of the 10th frequency multiplier, first
The signal ten that first power amplifier exports is multiplied to second frequency range by ten frequency multipliers, and the signal of output is sent to
Two power amplifiers, the second power amplifier are exported by emission switch group to transmitting antenna array after being amplified；Second shakes
The oscillator signal for swinging device output third frequency range (2.69-3.29GHz frequency ranges), is sent to the second work(after delayer
Device, third power amplifier is divided to receive the power signal of the second power splitter output and exported to the first frequency mixer after amplifying to it,
First frequency mixer is sent to the after being mixed the signal that the signal that third power amplifier exports and the first power splitter export
Four power amplifiers, the 4th power amplifier amplify the signal that the first frequency mixer exports to reach the driving power of nine frequency multipliers
Range, the signal nine that the 4th power amplifier exports is multiplied to the 4th frequency range by nine frequency multipliers, and the signal of output is sent out
Send to the first bandpass filter, the signal that the docking of the first bandpass filter is received is filtered, and by filtered signal export to
5th power amplifier；The power signal of second power splitter output is also sent to the 20th frequency multiplier, the docking of the 20th frequency multiplier
The signal that receives carries out being sent to the second frequency mixer after ten process of frequency multiplication, and the second frequency mixer is by the 20th frequency multiplier received
Output signal and the signal exported successively via receiving antenna array, reception switching group and the 8th power amplifier are mixed
Frequently, the output signal after mixing is sent to the second bandpass filter, and the second bandpass filter is filtered the signal received,
Filtered signal is sent to the 6th power amplifier, and the signal and the 5th power amplifier of the 6th power amplifier output are defeated
The signal gone out is sent to third frequency mixer and is mixed, and the output signal after mixing is successively via third bandpass filter and the 7th
Power amplifier is sent to digital collection module.
Further, Frequency Synthesizer is made of reference source, power splitter, frequency multiplier, frequency mixer and amplifier, in addition to transmitter with
Other than frequency needed for receiver, the difference frequency between them is used for the double conversion of intermediate frequency, for eliminating Frequency Synthesizer initial phase
It influences.System generates required step frequency signal by Frequency Synthesizer, and longitudinal sampling interval is 4 millimeters, sampling number 127
It is a；Sampling interval in direction of rotation is 0.2 degree, and sampling number is 300.So to make sweep time be less than 2s, (machinery is swept
Retouch speed be 30 °/s), then signal duration needed to be less than as 2s/80/127/300=0.66 μ s plus frequency modulated time.
Further, the switching group is made of two-stage SP8T switch cascades, and every grade of electronic switch number is respectively 8 and 1
It is a.According to the performance of system requirements and the practical switch of millimeter wave at present, the switch time of electronic switch is less than 5ns.When switch every
When reaching 30dB from degree, the transmitting of adjacent 7 antennas or the noise power ratio for receiving signal reception receive the low 20dB of power
More than.
In above-mentioned Ka wave bands scheme, dual-mode antenna is in close proximity, and transmitting antenna will have signal directly to drain to reception antenna, this is very
It may cause the saturation of receiver.Therefore, the application is well-designed by being carried out to antenna array module, reduces to the greatest extent from transmitting day
Straight leakage signal of the line to reception antenna.In addition, also filtering out shadow of the straight leakage signal to imaging results by way of time gate filtering
It rings.Time gate filters：Emission array is directly leaked to the signal of receiving array, anti-with the normal radar for reaching receiving array
It penetrates between signal, there are one the time differences to be isolated emission array by the way that the signal other than the normal radar time to be filtered
The straight leakage signal of leakage.
In addition, after the multistage SP8T switch cascades of switching group, need to be adjusted to for 50 nanoseconds per the delay difference between the signal of road
Within；And switching group causes receiver noise factor larger, is noise-reduction coefficient, can add after every antenna level-one low noise with
Solve the problems, such as this.
According to further aspect of the application, system uses V-band design scheme：
V-band can get complete, low price chipset；V-band wavelength is 4mm, and wavelength is relatively short, in certain resolution
Under rate requires, it is possible to reduce system bulk.One of V-band chipset is the disadvantage is that this frequency range is needed according to existing chip system
Make.Available working band is 76~80GHz (by the noise coefficient of low noise, the working frequency of frequency multiplier limits), and bandwidth is
4GHz, range direction distance resolution are relatively poor (for 3.75cm).
In V-band design scheme, antenna array module include the transmitting antenna array being made of 64 transmitting antennas and by
The receiving antenna array that 64 reception antennas are constituted；The length of antenna array module is 0.25m, and 30 ° of rotation angle needs are adjacent
Transmitting antenna either longitudinally spaced between adjacent reception antenna for 2mm adjacent transmissions antenna or the day of adjacent reception antenna
Line lateral separation<4mm.Preferably, the directional diagram for every antenna in guarantee array element can cover 2 meters of (height) × 1 meter
The imaging region of (width), the X-direction half-power beam (being referred to as antenna beam) that can acquire transmitting antenna or reception antenna are wide
Degree at least needs 103 °, and the half-power beam width of Z-direction at least needs 132 °.
Radar signal of the millimeter wave transceiving module for emitting and receiving broadband in order, and signal will be received by putting
Greatly, filtering is transmitted to digital module and is acquired with after down-converted.It includes switching group, transceiver and Frequency Synthesizer.
Wherein, it is contemplated that dynamic range of the operating distance (0.5~1m) in radar equation is 12dB, and by target
RCS variation ranges are thought of as 3dB, then the Power Dynamic Range of receiver front end needs 15dB.Transceiver design is as follows：It is wrapped
Include third oscillator, the 9th power amplifier, the tenth power amplifier, the 4th oscillator, the second delayer, the 4th frequency mixer,
4th bandpass filter, the 11st power amplifier, the 5th bandpass filter, the 12nd power amplifier, third oscillator are defeated
Go out the signal of the first predeterminated frequency range, and successively via exported after the 9th power amplifier and the amplification of the tenth power amplifier to
Emission switch group and transmitting antenna array；The signal that 4th oscillator exports the second predeterminated frequency range prolongs via the second delayer
It lags and is sent to the 4th frequency mixer, the signal that receiving antenna array receives is via reception switching group and the 12nd power amplifier
It is sent to the 4th frequency mixer, the signal that the signal and the 12nd power amplifier that the 4th frequency mixer sends the second delayer are sent
The 4th bandpass filter is sent to after being mixed, the signal of the 4th bandpass filter output is successively via the 11st power amplification
Device and the 5th bandpass filter are sent to digital collection module.
Further, Frequency Synthesizer is for step frequency signal needed for generation system, when signal bandwidth reaches 4GHz, distance side
To resolution ratio can reach 3.75cm.According to sampling criterion, frequency interval needs 75MHz, in frequency range totally 54 adopt
Sampling point；And be 2 millimeters in longitudinal sampling interval, sampling number is 127；Sampling interval in direction of rotation is 0.2 degree, sampling
Points are 128.So to make sweep time be less than 2s (mechanical scanning speed is 15 °/s), then signal duration is plus tune
The frequency time needs to be less than as 2s/54/127/128=2 μ s.
Transmitter when Multi-stage electronic group of switches by being connected to transmitting antenna array.Further, the switching group by
Three-level SP4T switch cascades are constituted, and every grade of switch number is respectively 16,4 and 1.Then according to system requirements and practical milli at present
The performance of metric wave switch, switch time should be less than 5ns.When switch isolation degree reaches 25dB, the transmitting of adjacent 3 antennas
Or it receives the noise power ratio that signal receives and receives the low 20dB or more of power.
The present invention through the above scheme, develops a kind of quick, high-resolution millimetre-wave radar foreign body detecting system, this is
The entrance that system can be positioned over the important places such as airport, harbour carries out safety inspection, can be dangerous in the metal on the person to hiding
Product (such as cutter, rifle have) and ceramic dangerous material (such as explosive) are accurately detected.The present invention passes through to millimeter wave transceiving mould
The transceiver and switching group and antenna array module of block are designed, and reach optimum performance.
Description of the drawings
Fig. 1 is plane body-scanner's surface structure；
Fig. 2 is millimetre-wave radar foreign matter detection system structure；
Fig. 3 is the arrangement mode of aerial array；
Fig. 4 is the geometrical relationship of antenna and imaging region；
Fig. 5 is the structure chart of transceiver module；
Fig. 6 is the structure diagram of transceiver；
Fig. 7 is signal duration and frequency modulated time schematic diagram；
Fig. 8 is Frequency Synthesizer structural schematic diagram；
Fig. 9 is the structure of transmit-receive switch group；
Figure 10 is that reconstructed module realizes structure；
Figure 11 is data-interface structure；
Figure 12 is the arrangement mode of aerial array；
Figure 13 is the geometrical relationship of antenna and imaging region；
Figure 14-a are the structure of transceiver module；
Figure 14-b are the structure diagram of transceiver；
Figure 15 is signal duration and frequency modulated time schematic diagram；
Figure 16 is Frequency Synthesizer structural schematic diagram；
Figure 17 is the structure of transmit-receive switch group；
Figure 18 is that reconstructed module realizes structure；
Figure 19 is data-interface structure.
Specific implementation mode
Illustrate the embodiment of the present invention below with reference to accompanying drawings.In the attached drawing of the present invention or a kind of embodiment
The elements and features of description can be combined with elements and features shown in one or more other attached drawings or embodiment.
It should be noted that for purposes of clarity, unrelated to the invention, those of ordinary skill in the art have been omitted in attached drawing and explanation
The expression and description of the component and processing known.
In the description of the present invention, it is to be understood that, term "center", " longitudinal direction ", " transverse direction ", "upper", "lower",
The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description of the present invention and simplification of the description, rather than instruction or dark
Show that signified device or element must have a particular orientation, with specific azimuth configuration and operation, therefore should not be understood as pair
The limitation of the present invention.In addition, term " first ", " second ", " third " are used for description purposes only, and it should not be understood as instruction or dark
Show relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
Can also be electrical connection to be mechanical connection；It can be directly connected, can also indirectly connected through an intermediary, Ke Yishi
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
The present invention will develop a kind of quick, HIGH RESOLUTION MMW foreign body detecting system, which will be positioned over machine
The entrance of the important places such as field, harbour carries out safety inspection, can be to hiding in metal dangerous material (such as cutter, rifle on the person
Tool etc.) and ceramics dangerous material (such as explosive) accurately detected.
Specifically, the outside drawing of the millimetre-wave radar foreign matter system of the present invention using antenna array module as shown in Figure 1, enclosed
Rotation sweep is carried out respectively around human body, to carry out quick and complete human body three-dimensional imaging.System includes one by broadband
The antenna array module of millimeter wave transceiving module driving, the antenna array module and millimeter wave transceiving module are fixed on one quickly
On mechanical scanner, this allows entire imaging data to be acquired in 2 seconds.In each scanning process, each channel
It is switched over using quick electronic switch, and obtains the data of each angle, to collect the number in complete two-dimentional aperture
According to.
According to systematic difference demand, total technical index is as follows：
● image taking speed：2~3 seconds/frame；
● image-forming range：0.5 meter；
● areas imaging：1 meter of (width) × 2 meter (height)；
● flat resolution：5~10 millimeters；
● range direction resolution ratio：3~4 centimetres.
The present invention millimetre-wave radar foreign matter detection system system structure as shown in Fig. 2, its by servo mechanism, antenna array
Row module, millimeter wave transceiving module (transceiver, Frequency Synthesizer and switching group), digital collection module, image reconstruction module sum number
It is constituted according to interface.
The scattered signal for the millimeter-wave signal and reception testee that wherein antenna array module is generated for emission system,
In vertical direction by switching electronic switch, artificial antenna vertical movement realizes that synthetic aperture measures, in direction of rotation by watching
It takes mechanism module and mechanical scanning realization synthetic aperture measurement is carried out to aerial array.Transceiver module is by emitting and receiving broadband
Step frequency signal is to realize that the high-resolution imaging to testee range direction, image reconstruction module are carried out to receiving data
Fast imaging processing, to obtain the realtime graphic of tested scene.Wherein, synthetic aperture imaging flow is the prior art, herein not
It is described in detail again.
According to the level of current domestic millimetric wave device and can obtainable foreign countries 40GHz or more millimeter wave chipsets, divide
Two kinds of system design schemes of Ka wave bands and V-band are not considered.
1 Ka wave band schemes
Ka wave band schemes are the main reason for working frequency of system are 27~33GHz, consider Ka wave band design schemes：
The device of domestic Ka wave bands is highly developed, cheap, and bandwidth can be made very wide, and the bandwidth of 6GHz can make range direction
Resolution ratio can reach 2.5cm.
1.1 antenna array module
Aerial array is made of the uniform linear array of two rows staggeredly, can be about in the hope of array length by resolution formula
0.5m, rotation angle need 60 °.According to sampling criterion formulas, longitudinal sampling interval is 4mm.Therefore needed for aerial array
Antenna element number is 128, each 64 of dual-mode antenna.Antenna arrangement is as shown in Figure 3.
To ensure that the directional diagram of every antenna in array element can cover the imaging region of 2 meters of (height) × 1 meter (width),
Antenna X-direction half-power beam width can be acquired and at least need 122 °, the half-power beam width of Z-direction at least needs 136 °.
X, the beam angle of Z-direction can be unified for 136 ° for ease of developing, as shown in Figure 4.
In conclusion the design objective of aerial array and antenna element is as follows：
● antenna element number：128, each 64 of transmitting-receiving；
● sweep radius：0.5m；
● antenna is longitudinally spaced：8mm；
● antenna lateral separation：<8mm；
● antenna beamwidth：136°.
In addition, the present invention uses above-mentioned design, and it is 128 by antenna cell design, antenna beamwidth：132 °, foundation
It is as follows：In order to reach flat resolution：5~10 millimeters, according to resolution formula, aerial array length is about 0.5m, according to adopting
Sample criterion formulas is divided into 4mm between longitudinal antenna samples.So antenna amount takes around 125.And the subsequent switch of antenna
Array is usually single-pole double throw (SP2T), hilted broadsword four-throw (SP4T), and hilted broadsword eight throws (SP8T), so usually 2,4,6 integer
Multiple, for example, if being 126 antennas (2*63), then switching circuit is not easy to design, and promotes cost instead.
If being less than 125 according to above-mentioned design antenna amount, flat resolution is not achieved 5 millimeters.
By resolution formula：
Wherein R0 is sweep radius, and L is array length, and λ is wavelength (light velocity/frequency).
Therefore, antenna array module includes the transmitting antenna array constituted by being not less than and (being more than or equal to) 64 transmitting antennas
With the receiving antenna array by being constituted not less than 64 reception antennas；The length of antenna array module is not less than 0.5m, rotation angle
Degree needs to be not less than 60 °, and longitudinally spaced needs between adjacent transmission antenna or adjacent reception antenna are no more than (being less than etc.
In) 8mm；The antenna lateral separation of adjacent transmission antenna or adjacent reception antenna is not more than (being less than or equal to) 8mm.Preferably,
To ensure that the directional diagram of every antenna in array element can cover the imaging region of 2 meters of (height) × 1 meter (width) or more, can ask
The X-direction half-power beam width for obtaining transmitting antenna or reception antenna at least needs 122 °, the half-power beam width of Z-direction
At least need 136 °.
1.2 transceiver module
The major function of transceiver module is to emit and receive the radar signal in broadband in order, and will receive signal by putting
Greatly, filtering is transmitted to digital module and is acquired with after down-converted.Transceiver module is by switching group, transceiver and frequency synthesizer
Three parts of device are constituted, as shown in Figure 5.
1.2.1 transceiver
In view of current domestic technical merit, Ka band receiver front-end noise coefficients are less than 10dB (including switches
Group).Estimate intermediate-frequency bandwidth within 1MHz by known signal duration.According to radar equation, when receiver exports noise
When than reaching 40dB, transmitting signal power needs 4.2dBm, much smaller than human-body safety radiation specified in IEEE C95.1-2005
Standard.
In view of changed power ranging from 12dB of the operating distance (0.5~1m) in radar equation, and by the RCS of target
Variation range is thought of as 3dB, then the Power Dynamic Range of receiver front end needs 15dB.The structure of transceiver is as shown in Figure 6.
Specifically, transceiver includes the first oscillator 1, the first power splitter 2, the first power amplifier 3, the 10th frequency multiplication
Device 4, the second power amplifier 5, the second oscillator 6, delayer 7, the second power splitter 8, third power amplifier 9, first are mixed
Device 10, the 4th power amplifier 11, nine frequency multipliers 12, the first bandpass filter 13, the 5th power amplifier 14, the second frequency mixer
15, the 20th frequency multiplier 16, third frequency mixer 17, the second bandpass filter 18, the 6th power amplifier 19, third bandpass filtering
Device 20, the 7th power amplifier 21 and the 8th power amplifier 22；
First oscillator 1, the first power splitter 2, the first power amplifier 3, the 10th frequency multiplier 4, the second power amplifier 5
It is sequentially connected with, the first oscillator 1 exports the oscillator signal of first frequency range, and is sent to the first power splitter 2；First power is put
Big device 3 receives the power signal of the first power splitter 2 output and is amplified to it to reach the driving power of the 10th frequency multiplier 4
The signal ten that first power amplifier 3 exports is multiplied to second frequency range by range, the 10th frequency multiplier 4, and by output
Signal is sent to the second power amplifier 5, and the second power amplifier 5 is exported by emission switch group to transmitting day after being amplified
Linear array；
Second oscillator 6 exports the oscillator signal of third frequency range, and the second power splitter 8 is sent to after delayer 7,
Third power amplifier 9 receives the power signal of the second power splitter 8 output and is exported to the first frequency mixer 10 after amplifying to it, the
One frequency mixer 10 is sent to after being mixed the signal that the signal that third power amplifier 9 exports and the first power splitter 2 export
4th power amplifier 11, the 4th power amplifier 11 amplify the signal that the first frequency mixer 10 exports to reach nine frequency multipliers 12
Driving power range, the signal nine that the 4th power amplifier 11 exports is multiplied to the 4th frequency range by nine frequency multipliers 12, and
The signal of output is sent to the first bandpass filter 13, the first bandpass filter 13 is filtered received signal, and will
Filtered signal is exported to the 5th power amplifier 14；
The power signal of second power splitter 8 output is also sent to the 20th frequency multiplier 16, and the 20th frequency multiplier 16 is to receiving
To signal carry out ten process of frequency multiplication after be sent to the second frequency mixer 15, the 20th frequency multiplier that the second frequency mixer 15 will receive
16 output signal and successively via receiving antenna array, receive switching group and the 8th power amplifier 22 output signal into
Row mixing, the output signal after mixing are sent to the second bandpass filter 18, and the second bandpass filter 18 is to the signal that receives
It is filtered, filtered signal is sent to the 6th power amplifier 19, the signal of the 6th power amplifier 19 output and the
The signal of five power amplifiers 14 output is sent to third frequency mixer 17 and is mixed, and the output signal after mixing is successively via the
Three bandpass filters 20 and the 7th power amplifier 21 are sent to digital collection module.
The technical indicator of transceiver is as follows：
● transmission power：4.2dBm；
● receiver bandwidth:6GHz；
● receiver gain:>60dB；
● receiver noise factor:10dB；
● receiver dynamic range:15dB.
1.2.2 Frequency Synthesizer
System passes through step frequency signal needed for Frequency Synthesizer generation system, when signal bandwidth reaches 6GHz, range direction
Resolution ratio can reach 2.5cm.According to sampling criterion, frequency interval needs 75MHz, totally 80 sampled points in frequency range；
And be 4 millimeters in longitudinal sampling interval, sampling number is 127；Sampling interval in direction of rotation is 0.2 degree, sampling number
It is 300.So to make sweep time be less than 2s (mechanical scanning speed is 30 °/s), then when signal duration adds frequency modulation
Between need to be less than as 2s/80/127/300=0.66 μ s, as shown in Figure 7.
Wherein the delay time of 60ns includes between range delay time and aerial array and the switching group in 1.5m
Delay difference.The frequency sweep time needed at this time is 53 μ s, and the electric scanning time is 6.8ms.
Frequency Synthesizer is made of reference source, power splitter, frequency multiplier, frequency mixer and amplifier, in addition to transmitter and receiver institute
It needs other than frequency, the difference frequency between them is used for the double conversion of intermediate frequency, the influence for eliminating Frequency Synthesizer initial phase, frequency synthesizer
Device structure is as shown in Figure 8 comprising and reference source, reference source export two-way, are respectively connected to two frequency multipliers, in the first via, one
Frequency multiplier is sequentially connected oscillator, power splitter, power amplifier and the ten frequency multipliers output 27-33GHz of 2.7-3.3GHz；Second
Lu Zhong, another frequency multiplier are sequentially connected oscillator, power splitter and ten frequency multipliers the output 26.9-32.9GHz of 2.69-3.29GHz,
In addition, the output of the power splitter is also connected with another power amplifier and frequency mixer, the output end of the power splitter of the first via is also connected to
The frequency mixer on the second tunnel, output is to nine frequency multipliers after mixing, using bandpass filter and power amplifier output
90MHz。
The key technical indexes of Frequency Synthesizer is as follows：
● transmitted waveform：Stepped frequency waveforms；
● output frequency：27~33GHz, 26.9~32.9GHz, 90MHz；
● frequency interval：75MHz；
● signal duration：0.3us；
● frequency modulated time：0.3us.
1.2.3 switching group
Transmitter is by being connected to transmitting antenna array, transmit-receive switch group structure such as Fig. 9 institutes when Multi-stage electronic group of switches
Show, switching group is made of two-stage SP8T switch cascades, and every grade of switch number is respectively 8 and 1.Then according to system requirements and reality
The performance of millimeter wave switch, switch time should be less than 5ns at present.When switch isolation degree reaches 30dB, adjacent 7 antennas
Transmitting or receive the noise power ratio that signal receives and receive the low 20dB or more of power.
The technical indicator of transmit-receive switch group is as follows：
● switch time：5ns；
● switch isolation degree：30dB.
1.3 image reconstruction modules
The major function of image reconstruction module is to complete the calculating process of Real Time Image System imaging.Add after acquisition first
The RAM storage echo raw datas for entering 32MBytes, ensure the data storage in imaging time.Then each channel needs to calculate
The Two-dimensional FFT that length is 128 × 512, when selecting 8 A/D, (when significance bit is 6.5, the signal-to-noise ratio that A/D noises introduce is
40dB), then DSP needs the cachings of 256Kytes sizes.The three-dimensional IFFT that length is 128 × 128 × 512 is finally carried out, it is required
DSP cache sizes are 32MBytes.And DSP calculating 368M real additions per second and 368M real multiplications at this time, to ensure to calculate
Time is less than 0.2 second, and the MAC times need 0.5ns (multiplier calculates the time of a multiplication and a sub-addition).
Image reconstruction module realizes that structure is as shown in Figure 10, and wherein bus is realized by FPGA.
To guarantee to being sampled in each signal duration, AD sample rates need 3MHz.Image reconstruction module skill
Art index is as follows：
● AD sample rates：3MHz；
● a/d resolution：≥8bit；
● cache size：256Kbytes；
32Mbytes；
● RAM sizes： 32Mbytes；
●DSP：The MAC times≤0.5ns.
1.4 data-interface
System completes that data are stored in memory after measuring, and waits for computer to be read by USB or LAN interface, in addition
ARM graphical interfaces can also be developed to complete the display function of 3-D view.
Data-interface part specific targets are as follows.
● memory：500GBytes hard disks；
●USB：Meet USB2.0 standards；
●LAN：Transmission rate 100Mbps.
1.5 key technology
The key technology of Ka wave band schemes is as follows：
(a) the straight leakage problem for receiving signal is transmitted signals to
Dual-mode antenna is in close proximity, and transmitting antenna will have signal directly to drain to reception antenna, this is likely to cause receiver full
With.The approach for solving the problems, such as this is：1) by the well-designed of antenna element and array, reduce to the greatest extent from transmitting antenna to
The straight leakage signal of reception antenna.2) by way of time gate filtering, straight leakage signal influence on RT is filtered out.
(b) needs of the requirement due to system to imaging time and sampling criterion propose high requirement to Frequency Synthesizer and (adjust
Frequency time 0.3us, signal duration 0.3us).The approach that may be solved is to increase imaging time to 4~5 seconds.
(c) it after the cascade of multistage SP8T switches, needs to be adjusted within 50 nanoseconds per the delay difference between the signal of road.And it opens
Pass group causes receiver noise factor larger, is noise-reduction coefficient, can add level-one low noise after every antenna.
2 V-band schemes
Choosing then V-band system design scheme the reason of be：1) V-band can get complete, low price chipset；2) V-band
Wavelength is 4mm, and wavelength is relatively short, under certain resolution requirement, it is possible to reduce system bulk.The one of V-band chipset
It is a the disadvantage is that this frequency range need according to have chip made.Available working band is 76~80GHz (by making an uproar for low noise
Sonic system number, the working frequency limitation of frequency multiplier), bandwidth 4GHz, range direction distance resolution is relatively poor (for 3.75cm).
2.1 antenna array module
Aerial array is made of the uniform linear array of two rows staggeredly, can be about in the hope of array length by resolution formula
0.25m, rotation angle need 30 °.According to sampling criterion formulas, longitudinal sampling interval is 2mm.Therefore needed for aerial array
Antenna element number is 128, each 64 of dual-mode antenna.Antenna arrangement is as shown in figure 12.
To ensure that the directional diagram of every antenna in array element can cover the imaging region of 2 meters of (height) × 1 meter (width),
Antenna X-direction half-power beam width can be acquired and at least need 103 °, the half-power beam width of Z-direction at least needs 132 °.
In the present embodiment, X, the beam angle of Z-direction can be unified for 132 ° for ease of developing, as shown in figure 13.
In conclusion the design objective of aerial array and antenna element is as follows：
● antenna element number：128, each 64 of transmitting-receiving；
● sweep radius：0.5m；
● same array antenna it is longitudinally spaced：4mm；
● antenna lateral separation：<4mm；
● antenna beamwidth：132°.
2.2 transceiver module
The major function of transceiver module is to emit and receive the radar signal in broadband in order, and will receive signal by putting
Greatly, filtering is transmitted to digital module and is acquired with after down-converted.Transceiver module is by switching group, transceiver and frequency synthesizer
Three parts of device are constituted, as shown in Figure 14-a.
2.2.1 transceiver
In view of current domestic technical merit, V-band receiver front end noise coefficient is less than 20dB (including switching group).
Estimate intermediate-frequency bandwidth within 1MHz by known signal duration.When receiver output signal-to-noise ratio reaches known to radar equation
When to 40dB, transmitting signal power needs 14dBm, much smaller than human-body safety radiation standard specified in IEEE C95.1-2005.
In view of dynamic range of the operating distance (0.5~1m) in radar equation is 12dB, and the RCS of target is changed
Range is thought of as 3dB, then the Power Dynamic Range of receiver front end needs 15dB.
For the structure of transceiver as shown in Figure 14-b, which includes third oscillator 31, the 9th power amplifier
32, the tenth power amplifier 33, the 4th oscillator 34, the second delayer 35, the 4th frequency mixer 36, the 4th bandpass filter 37,
11st power amplifier 38, the 5th bandpass filter 39 and the 12nd power amplifier 40；The output of third oscillator 31 first
The signal of predeterminated frequency range, and successively via output after the 9th power amplifier 32 and the amplification of the tenth power amplifier 33 to hair
Penetrate switching group and transmitting antenna array；4th oscillator 34 exports the signal of the second predeterminated frequency range via the second delayer 35
The 4th frequency mixer 36 is sent to after delay, the signal that receiving antenna array receives is put via reception switching group and the 12nd power
Big device 40 is sent to the 4th frequency mixer 36, the signal and the 12nd power amplification that the 4th frequency mixer 36 sends the second delayer 35
The signal that device 40 is sent is sent to the 4th bandpass filter 37 after being mixed, the signal of the 4th bandpass filter 37 output is successively
It is sent to digital collection module via the 11st power amplifier 38 and the 5th bandpass filter 39.
The technical indicator of transceiver is as follows：
● transmission power：14dBm；
● receiver bandwidth:4GHz；
● receiver gain:>60dB；
● receiver noise factor:20dB；
● receiver dynamic range:15dB.
2.2.2 Frequency Synthesizer
System passes through step frequency signal needed for Frequency Synthesizer generation system, when signal bandwidth reaches 4GHz, range direction
Resolution ratio can reach 3.75cm.According to sampling criterion, frequency interval needs 75MHz, totally 54 sampled points in frequency range；
And be 2 millimeters in longitudinal sampling interval, sampling number is 127；Sampling interval in direction of rotation is 0.2 degree, sampling number
It is 128.So to make sweep time be less than 2s (mechanical scanning speed is 15 °/s), then when signal duration adds frequency modulation
Between need to be less than as 2s/54/127/128=2 μ s, as shown in figure 15.
Wherein the delay time of 60ns includes between range delay time and aerial array and the switching group in 1.5m
Delay difference.The frequency sweep time needed at this time is 108 μ s, and the electric scanning time is 13.7ms.
Frequency Synthesizer is made of reference source, power splitter, frequency multiplier, frequency mixer and amplifier, and Frequency Synthesizer structure is as shown in figure 16,
Reference source exports two-way, is sequentially connected transmitting local oscillator, frequency multiplier, power amplifier all the way, output 78-80GHz frequency ranges
Signal, another way are sequentially connected delayer, receive local oscillator, frequency multiplier (different from the frequency multiplier of the first via) and power amplification
Device (different from the power amplifier of the first via) exports the signal of 77.99-79.99GHz frequency ranges.
The key technical indexes of Frequency Synthesizer is as follows：
● transmitted waveform：Stepped frequency waveforms；
● output frequency：78~80GHz, 77.99~79.99GHz；
● frequency interval：75MHz；
● signal duration：1us；
● frequency modulated time：1us.
2.2.3 switching group
Transmitter is by being connected to transmitting antenna array, sending and receiving switching group structure such as Figure 17 when Multi-stage electronic group of switches
Shown, switching group is made of three-level SP4T switch cascades, and every grade of switch number is respectively 16,4 and 1.Then according to system need
The performance of the practical switch of millimeter wave at present of summation, switch time should be less than 5ns.When switch isolation degree reaches 25dB, phase
The transmitting of adjacent 3 antennas receives the low 20dB or more of noise power ratio reception power that signal receives.
The technical indicator of transmit-receive switch group is as follows：
● switch time：5ns；
● switch isolation degree：25dB.
2.3 image reconstruction modules
The major function of image reconstruction module is to complete the calculating process of Real Time Image System imaging.Add after acquisition first
The RAM storage echo raw datas for entering 4MBytes, ensure the data storage in imaging time.Then each channel needs to calculate
The Two-dimensional FFT that length is 128 × 128, when selecting 8 A/D, (when significance bit is 6.5, the signal-to-noise ratio that A/D noises introduce is
40dB), then DSP needs the cachings of 128Kytes sizes.The three-dimensional IFFT that length is 64 × 128 × 128 is finally carried out, it is required
DSP cache sizes are 4MBytes.And DSP calculating 40M real additions per second and 40M real multiplications at this time, to ensure to calculate the time
Less than 0.2 second, the MAC times needed 5ns (multiplier calculates the time of a multiplication and a sub-addition).
Image reconstruction module realizes that structure is as shown in figure 18, and wherein bus is realized by FPGA.
To guarantee to being sampled in each signal duration, AD sample rates need 1MHz.Image reconstruction module skill
Art index is as follows：
● AD sample rates：1MHz；
● a/d resolution：≥8bit；
● cache size：128Kbytes；
4Mbytes；
● RAM sizes： 4Mbytes；
●DSP：The MAC times≤5ns.
2.4 data-interface
System completes that data are stored in memory after measuring, and waits for computer to be read by USB or LAN interface, in addition
ARM graphical interfaces can also be developed to complete the display function of 3-D view.
Data-interface part specific targets are as follows.
● memory：500GBytes hard disks；
●USB：Meet USB2.0 standards；
●LAN：Transmission rate 100Mbps.
2.5 key technology
Key technology present in system is as follows：
(a) the straight leakage problem for receiving signal is transmitted signals to
Dual-mode antenna is in close proximity, and transmitting antenna will have signal directly to drain to reception antenna, this is likely to cause receiver full
With.The approach for solving the problems, such as this is：1) by the well-designed of antenna element and array, reduce to the greatest extent from transmitting antenna to
The straight leakage signal of reception antenna.2) by way of time gate filtering, straight leakage signal influence on RT is filtered out.
(b) it after the cascade of multistage SP4T switches, needs to be adjusted within 50 nanoseconds per the delay difference between the signal of road.And it opens
Pass group causes receiver noise factor larger, is noise-reduction coefficient, can add level-one low noise after every antenna.
The present invention through the above scheme, develops a set of millimetre-wave radar foreign body detecting system prototype.The overall skill of the model machine
Art index is：2~3 seconds/frame of image taking speed, 5~10mm of resolution ratio.Since the receiver of focal plane radiometer only has American and Britain two
State can obtain, and annular interference SAR in picture quality and calculates existing defects on the time, so the design scheme of the present invention is adopted
It is realized with domestic unique 3D hologram imaging technique.In addition, the present invention is according to the millimeter wave device that can get at present
Performance and price, it is contemplated that two kinds of system schemas：One is Ka band system schemes, this allows for the domestic device in Ka wave bands
Part level is quite ripe；Another kind is V-band system schema, it is allowed for can obtain set of core on V-band
Piece group, and system is operated on V-band will have overall compact system structure.
In the feature above in the description of the specific embodiment of the invention, describing and/or showing for a kind of embodiment
It can be used in one or more other embodiments with same or similar mode, with the feature in other embodiment
It is combined, or substitute the feature in other embodiment.
It should be emphasized that term "comprises/comprising" refers to the presence of feature, element, step or component when being used herein, but simultaneously
It is not excluded for the presence or additional of one or more other features, element, step or component.
In above-described embodiment and example, the reference numeral of number composition is used to indicate each step and/or unit.
It should be appreciated by those skilled in the art that these reference numerals are only to facilitate describing and drawing, and not indicate that its is suitable
Sequence or any other restriction.
In addition, the method for the present invention be not limited to specifications described in time sequencing execute, can also according to it
His time sequencing, concurrently or independently execute.Therefore, the execution sequence of method described in this specification is not to this hair
Bright technical scope is construed as limiting.
Although above by being had been disclosed to the present invention to the description of specific embodiments of the present invention, it answers
The understanding, above-mentioned all embodiments and example are exemplary, and not restrictive.Those skilled in the art can be in institute
Various modifications, improvement or equivalent of the design to the present invention in attached spirit and scope by the claims.These modification, improve or
Person's equivalent should also be as being to be considered as included in protection scope of the present invention.
Claims (10)
1. a kind of foreign body detecting system based on millimetre-wave radar, it is characterised in that：Including：
One millimeter wave transceiving module, including switching group, transceiver and Frequency Synthesizer；Switching group includes multiple launching electronics switching groups
At emission switch group and by multiple reception switching groups for forming of reception electronic switches；Frequency Synthesizer is needed for generation system
Step frequency signal；Transceiver is pacified for generating to be sent to the millimeter wave transmitting signal of safety check object and receive and handle
Examine the scatter echo signal of object；
One antenna array module, connect with millimeter wave transceiving module, for sending millimeter wave transmitting signal and receiving scatter echo
Signal；Antenna array module includes transmitting antenna array and receiving antenna array, and transmitting antenna array includes N number of transmitting antenna,
Receiving antenna array includes N number of reception antenna, N number of reception of the N number of transmitting antenna and receiving antenna array of transmitting antenna array
Antenna corresponds；
One digital collection module receives the signal of millimeter wave transceiving module output and handles it；
One image reconstruction module receives the signal of digital collection module output, fast imaging processing is carried out to it, to be tested
The realtime graphic of scene.
2. the foreign body detecting system according to claim 1 based on millimetre-wave radar, it is characterised in that：The aerial array
Module and millimeter wave transceiving module are fixed in a fast mechanical scan equipment；Antenna array module is in vertical direction by cutting
It changes the launching electronics switch of switching group or receives electronic switch, artificial antenna vertical movement realizes that synthetic aperture measures, and is rotating
Direction carries out mechanical scanning by servo mechanism, to aerial array and realizes that synthetic aperture measures.
3. the foreign body detecting system according to claim 1 or 2 based on millimetre-wave radar, it is characterised in that：The antenna
Array module includes transmitting antenna array by being constituted not less than 64 transmitting antennas and is constituted by being not less than 64 reception antennas
Receiving antenna array；
The length of antenna array module is not less than 0.5m, and rotation angle is not less than 60 °, adjacent transmission antenna or adjacent reception day
It is longitudinally spaced no more than 8mm between line；The antenna lateral separation of adjacent transmission antenna or adjacent reception antenna<8mm；
The antenna beamwidth of X-direction is more than 122 °, and the antenna beamwidth of Z-direction is more than 136 °.
4. the foreign body detecting system according to claim 3 based on millimetre-wave radar, it is characterised in that：The transceiver
Including the first oscillator, the first power splitter, the first power amplifier, the 10th frequency multiplier, the second power amplifier, the second oscillation
Device, delayer, the second power splitter, third power amplifier, the first frequency mixer, the 4th power amplifier, nine frequency multipliers, first band
Bandpass filter, the 5th power amplifier, the second frequency mixer, the 20th frequency multiplier, third frequency mixer, the second bandpass filter,
Six power amplifiers, third bandpass filter, the 7th power amplifier and the 8th power amplifier；
First oscillator, the first power splitter, the first power amplifier, the 10th frequency multiplier, the second power amplifier are sequentially connected with,
First oscillator exports the oscillator signal of first frequency range, and is sent to the first power splitter；
First power amplifier receives the power signal of the first power splitter output and is amplified to it to reach the 10th frequency multiplication
The signal ten that first power amplifier exports is multiplied to second frequency range by the driving power range of device, the 10th frequency multiplier,
And the signal of output is sent to the second power amplifier, the second power amplifier exports after being amplified by emission switch group
To transmitting antenna array；
Second oscillator exports the oscillator signal of third frequency range, and the second power splitter, third work(are sent to after delayer
Output to the first frequency mixer, the first frequency mixer will after rate amplifier receives the power signal of the second power splitter output and amplifies to it
The signal of third power amplifier output and the signal of the first power splitter output are sent to the 4th power amplifier after being mixed,
4th power amplifier amplifies the signal that the first frequency mixer exports to reach the driving power range of nine frequency multipliers, nine frequency multipliers
The signal nine that 4th power amplifier exports is multiplied to the 4th frequency range, and the signal of output is sent to the filter of the first band logical
Wave device, the signal that the docking of the first bandpass filter is received is filtered, and filtered signal is exported to the 5th power amplifier；
The power signal of second power splitter output is also sent to the 20th frequency multiplier, the 20th frequency multiplier to the signal that receives into
Be sent to the second frequency mixer after ten process of frequency multiplication of row, the second frequency mixer by the output signal of the 20th frequency multiplier received and
It is mixed successively via the signal of receiving antenna array, reception switching group and the output of the 8th power amplifier, it is defeated after mixing
Go out signal and be sent to the second bandpass filter, the second bandpass filter is filtered the signal received, filtered signal
It is sent to the 6th power amplifier, the signal of the 6th power amplifier output and the signal of the 5th power amplifier output are sent
It is mixed to third frequency mixer, the output signal after mixing is sent out via third bandpass filter and the 7th power amplifier successively
It send to digital collection module.
5. the foreign body detecting system according to claim 3 based on millimetre-wave radar, it is characterised in that：The Frequency Synthesizer
Signal duration is less than 0.66 μ s plus frequency modulated time.
6. the foreign body detecting system according to claim 3 based on millimetre-wave radar, it is characterised in that：The switching group by
Two-stage SP8T switch cascades are constituted, and every grade of electronic switch number is respectively 8 and 1；The switch time of electronic switch is less than 5ns.
7. the foreign body detecting system according to claim 1 or 2 based on millimetre-wave radar, it is characterised in that：The antenna
Array module includes the transmitting antenna array being made of 64 transmitting antennas and the receiving antenna array that is made of 64 reception antennas
Row；The length of antenna array module is 0.25m, and rotation angle is 30 °；
Either longitudinally spaced between adjacent reception antenna is 2mm adjacent transmissions antenna or adjacent reception to adjacent transmission antenna
The antenna lateral separation of antenna<4mm；The half-power antenna beamwidth of X-direction is more than 103 °, the half-power antenna wave of Z-direction
Beam width is more than 132 °.
8. the foreign body detecting system according to claim 7 based on millimetre-wave radar, it is characterised in that：
The transceiver includes third oscillator, the 9th power amplifier, the tenth power amplifier, the 4th oscillator, second
Delayer, the 4th frequency mixer, the 4th bandpass filter, the 11st power amplifier, the 5th bandpass filter and the 12nd power
Amplifier；
Third oscillator exports the signal of the first predeterminated frequency range, and is put successively via the 9th power amplifier and the tenth power
It is exported to emission switch group and transmitting antenna array after big device amplification；4th oscillator exports the signal of the second predeterminated frequency range
Be sent to the 4th frequency mixer after postponing via the second delayer, the signal that receiving antenna array receives via receive switching group and
12nd power amplifier is sent to the 4th frequency mixer, the signal and the 12nd power that the 4th frequency mixer sends the second delayer
The signal that amplifier is sent is sent to the 4th bandpass filter after being mixed, the signal of the 4th bandpass filter output passes through successively
Digital collection module is sent to by the 11st power amplifier and the 5th bandpass filter.
9. the foreign body detecting system according to claim 7 based on millimetre-wave radar, it is characterised in that：The Frequency Synthesizer
Signal duration is less than 2 μ s plus frequency modulated time.
10. the foreign body detecting system according to claim 7 based on millimetre-wave radar, it is characterised in that：The switching group
It is made of three-level SP4T switch cascades, every grade of switch number is respectively 16,4 and 1；The switch time of electronic switch is less than
5ns。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810329843.4A CN108519623A (en) | 2018-04-13 | 2018-04-13 | Foreign body detecting system based on millimetre-wave radar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810329843.4A CN108519623A (en) | 2018-04-13 | 2018-04-13 | Foreign body detecting system based on millimetre-wave radar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108519623A true CN108519623A (en) | 2018-09-11 |
Family
ID=63432495
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810329843.4A Pending CN108519623A (en) | 2018-04-13 | 2018-04-13 | Foreign body detecting system based on millimetre-wave radar |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108519623A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109360361A (en) * | 2018-12-14 | 2019-02-19 | 辽宁奇辉电子系统工程有限公司 | A kind of railroad platform end intrusion detection early warning system |
| CN109405671A (en) * | 2018-10-31 | 2019-03-01 | 西安近代化学研究所 | A kind of COMBUSTION TO DETONATION TRANSITION wave speed measurement device |
| CN109633630A (en) * | 2018-10-31 | 2019-04-16 | 上海无线电设备研究所 | A kind of E wave band millimeter wave imaging safety check radar system |
| CN109995397A (en) * | 2018-12-19 | 2019-07-09 | 安徽华东光电技术研究所有限公司 | 64 road Ka wave band array switch |
| CN111175748A (en) * | 2019-12-24 | 2020-05-19 | 北京华研微波科技有限公司 | Millimeter wave antenna array |
| CN111243237A (en) * | 2020-01-16 | 2020-06-05 | 珠海格力电器股份有限公司 | Drowning monitoring method, equipment, device and storage medium |
| CN111768492A (en) * | 2020-06-09 | 2020-10-13 | 上海工物高技术产业发展有限公司 | Virtual fitting system |
| CN112763514A (en) * | 2020-12-09 | 2021-05-07 | 北京无线电计量测试研究所 | Receiving and transmitting antenna module and system of millimeter wave real-time imaging personnel security check system |
| CN112946637A (en) * | 2019-12-10 | 2021-06-11 | 中国科学院国家空间科学中心 | Radar system and method for differential interference double-station synchronous scanning high-resolution imaging |
| CN112987024A (en) * | 2019-08-23 | 2021-06-18 | 长沙天仪空间科技研究院有限公司 | Imaging device and method based on synthetic aperture laser radar |
| CN113126035A (en) * | 2021-04-20 | 2021-07-16 | 核工业西南物理研究院 | Multichannel microwave detector based on comb spectrum frequency conversion |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102135629A (en) * | 2010-12-21 | 2011-07-27 | 中国科学院上海微系统与信息技术研究所 | Millimeter wave transceiving module for holographic imaging safety inspection system |
| CN102508240A (en) * | 2011-10-30 | 2012-06-20 | 北京无线电计量测试研究所 | Scanning method for millimeter-wave active three-dimensional holographic-imaging human body security check system |
| CN202334510U (en) * | 2011-11-02 | 2012-07-11 | 北京无线电计量测试研究所 | Transceiver for millimeter wave active personnel safety inspection device |
| CN104303073A (en) * | 2011-12-22 | 2015-01-21 | 雀莱斯企业股份有限公司 | Long range millimeter wave surface imaging radar system |
| CN105510912A (en) * | 2015-12-25 | 2016-04-20 | 深圳市太赫兹科技创新研究院 | Millimeter wave holographic three-dimensional imaging-based human body security inspection system and method |
| CN105699494A (en) * | 2015-12-28 | 2016-06-22 | 深圳市太赫兹科技创新研究院 | Millimeter wave holographic three-dimensional imaging detection system and method |
| CN107238868A (en) * | 2017-07-31 | 2017-10-10 | 深圳市无牙太赫兹科技有限公司 | Millimeter wave real time imagery safety detecting system and safety detection method |
-
2018
- 2018-04-13 CN CN201810329843.4A patent/CN108519623A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102135629A (en) * | 2010-12-21 | 2011-07-27 | 中国科学院上海微系统与信息技术研究所 | Millimeter wave transceiving module for holographic imaging safety inspection system |
| CN102508240A (en) * | 2011-10-30 | 2012-06-20 | 北京无线电计量测试研究所 | Scanning method for millimeter-wave active three-dimensional holographic-imaging human body security check system |
| CN202334510U (en) * | 2011-11-02 | 2012-07-11 | 北京无线电计量测试研究所 | Transceiver for millimeter wave active personnel safety inspection device |
| CN104303073A (en) * | 2011-12-22 | 2015-01-21 | 雀莱斯企业股份有限公司 | Long range millimeter wave surface imaging radar system |
| CN105510912A (en) * | 2015-12-25 | 2016-04-20 | 深圳市太赫兹科技创新研究院 | Millimeter wave holographic three-dimensional imaging-based human body security inspection system and method |
| CN105699494A (en) * | 2015-12-28 | 2016-06-22 | 深圳市太赫兹科技创新研究院 | Millimeter wave holographic three-dimensional imaging detection system and method |
| CN107238868A (en) * | 2017-07-31 | 2017-10-10 | 深圳市无牙太赫兹科技有限公司 | Millimeter wave real time imagery safety detecting system and safety detection method |
Non-Patent Citations (1)
| Title |
|---|
| 刘佳琪 等: "《雷达电子战系统射频注入式半实物仿真》", 30 September 2016 * |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109405671A (en) * | 2018-10-31 | 2019-03-01 | 西安近代化学研究所 | A kind of COMBUSTION TO DETONATION TRANSITION wave speed measurement device |
| CN109633630A (en) * | 2018-10-31 | 2019-04-16 | 上海无线电设备研究所 | A kind of E wave band millimeter wave imaging safety check radar system |
| CN109360361A (en) * | 2018-12-14 | 2019-02-19 | 辽宁奇辉电子系统工程有限公司 | A kind of railroad platform end intrusion detection early warning system |
| CN109995397A (en) * | 2018-12-19 | 2019-07-09 | 安徽华东光电技术研究所有限公司 | 64 road Ka wave band array switch |
| CN112987024A (en) * | 2019-08-23 | 2021-06-18 | 长沙天仪空间科技研究院有限公司 | Imaging device and method based on synthetic aperture laser radar |
| CN112987024B (en) * | 2019-08-23 | 2023-10-13 | 长沙天仪空间科技研究院有限公司 | Imaging device and method based on synthetic aperture laser radar |
| CN112946637A (en) * | 2019-12-10 | 2021-06-11 | 中国科学院国家空间科学中心 | Radar system and method for differential interference double-station synchronous scanning high-resolution imaging |
| CN112946637B (en) * | 2019-12-10 | 2023-05-02 | 中国科学院国家空间科学中心 | Radar system and method for differential interference double-station synchronous scanning high-resolution imaging |
| CN111175748A (en) * | 2019-12-24 | 2020-05-19 | 北京华研微波科技有限公司 | Millimeter wave antenna array |
| CN111243237A (en) * | 2020-01-16 | 2020-06-05 | 珠海格力电器股份有限公司 | Drowning monitoring method, equipment, device and storage medium |
| CN111768492A (en) * | 2020-06-09 | 2020-10-13 | 上海工物高技术产业发展有限公司 | Virtual fitting system |
| CN112763514A (en) * | 2020-12-09 | 2021-05-07 | 北京无线电计量测试研究所 | Receiving and transmitting antenna module and system of millimeter wave real-time imaging personnel security check system |
| CN113126035A (en) * | 2021-04-20 | 2021-07-16 | 核工业西南物理研究院 | Multichannel microwave detector based on comb spectrum frequency conversion |
| CN113126035B (en) * | 2021-04-20 | 2024-01-23 | 核工业西南物理研究院 | Multichannel microwave detector based on comb spectrum frequency conversion |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108519623A (en) | Foreign body detecting system based on millimetre-wave radar | |
| Cheng et al. | 340-GHz 3-D imaging radar with 4Tx-16Rx MIMO array | |
| Cooper et al. | Submillimeter-wave radar: Solid-state system design and applications | |
| WO2017107283A1 (en) | Apparatus and method for security check of multiple human bodies based on linear frequency modulation | |
| Charvat et al. | A through-dielectric radar imaging system | |
| CN106019275B (en) | Millimeter wave imaging system and safe examination system | |
| Dawidowicz et al. | Detection of moving targets with multichannel airborne passive radar | |
| Cheong et al. | PX-1000: A solid-state polarimetric X-band weather radar and time–frequency multiplexed waveform for blind range mitigation | |
| US9476973B2 (en) | Combined radar assembly with linear and nonlinear radar | |
| CN205608180U (en) | Three -dimensional holographic imaging's security inspection system | |
| CN105699493B (en) | High ferro nondestructive detection system and method | |
| CN207352187U (en) | Millimeter wave real time imagery safety detecting system | |
| CN109696711A (en) | A kind of convolutional neural networks target detection recognition methods based on polarization scattering characteristics | |
| Narayanan | Noise radar techniques and progress | |
| US10983209B2 (en) | Accurate signal compensations for UWB radar imaging in dispersive medium | |
| Wang | UWB pulse radar for human imaging and doppler detection applications | |
| Vela et al. | Noise radar tomography | |
| Kapilevich et al. | FMCW MM-wave non-imaging sensor for detecting hidden objects | |
| CN208224481U (en) | A kind of millimeter-wave signal transceiver machine | |
| Liu et al. | High-resolution ice-sounding radar measurements of ice thickness over East Antarctic Ice Sheet as a part of Chinese National Antarctic Research Expedition | |
| Guo et al. | Super-resolution staring imaging radar based on stochastic radiation fields | |
| Shin et al. | Ultrawideband noise radar imaging of impenetrable cylindrical objects using diffraction tomography | |
| Savci et al. | Software defined L-band noise radar demonstrator | |
| Binningsbo et al. | 3D migration of GPR array-antenna data | |
| Savelyev et al. | Comparison of UWB SAR and MIMO-based short-range imaging radars |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180911 |
|
| RJ01 | Rejection of invention patent application after publication |