CN105866850B - A kind of remote human body hidden dangerous goods detector based on radar target polarization characteristic - Google Patents
A kind of remote human body hidden dangerous goods detector based on radar target polarization characteristic Download PDFInfo
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Abstract
The invention discloses a kind of remote human body hidden dangerous goods detector based on radar target polarization characteristic, including aobvious control end, signal processing and control module, linear frequency modulation source module, transmitting-receiving frequency multiplication link module, clock distribution module, intermediate frequency amplification filter module, signal acquisition module；Linear frequency modulation source module provides linear FM signal for transmitting-receiving frequency multiplication link module；Transmitting-receiving frequency multiplication link module by linear FM signal frequency multiplication that linear frequency modulation source module provides to designated frequency band, amplify after be radiated detected object, the reflection echo of detected object is received, processing is transferred to intermediate frequency amplification filter module, finally returns back to aobvious control end；Aobvious control end is according to the multi collect data received, counting the method for the distribution of the intensity value of the orthogonal two-way echo of detected object can effectively detect whether detected object carries dangerous material, remote detection can be achieved, safety check can be carried out to the Dense crowd for being in open place, checked object is not required to cooperate on one's own initiative.
Description
Technical field
It is particularly a kind of special based on radar target polarization the present invention relates to the technical field that safety check is carried out using radar detection
The remote human body hidden dangerous goods detector of property.
Background technology
In recent years, the events such as violence attack of terrorism happen occasionally, and people propose higher requirement for anti-terrorism security protection, special
It is not on airport, how the big public place of the flows of the people such as railway station or subway realizes the knife hidden with oneself to offender
The weapons such as tool, gun, explosive carry out remote fast automatic detecting and identification, be that current public safety field faces one
Problem.
Existing safety check means are all respectively to human body and belongings using the equipment being placed at the feeder connection of place
Product are checked that advantage is that the error probability of detection is very low, and this safety check means are only applicable to the detection to cooperation object, i.e.,
It is required that checked object cooperation rays safety detection apparatus is detected, and rays safety detection apparatus generally can only all be fixed on feeder connection position, no
Possesses remote pre-alerting ability.This more advanced technical solution at present has, such as publication date is September in 2015 23 days, public
The number of opening be CN104932029A Chinese invention patent document, disclose a kind of active Terahertz human body security check system device and
Method of adjustment, the system and device include target person, Terahertz plane mirror, Terahertz focus lamp, terahertz detector, figure
As analysis and processing module, air jet system, target auto-induction apparatus, baffle, crust of the device, background board, THz source, shake at a high speed
Mirror and Terahertz transmission waveguide, specific method are：The THz wave that THz source gives off is by Terahertz eliminating coherence with shaking
After mirror, into Terahertz transmission waveguide and it is divided into multiple ports, uniform irradiation, target person is carried out to target person from different perspectives
Object body surface can reflective homogeneous be irradiated to THz wave with it, by control Terahertz plane mirror swinging axle and
Angular adjustment axis, so as to fulfill the fast scan imaging to target person, according to actual experiment situation setting swing angle and rotation
Gyration.
But in the opening place of no clear and definite feeder connection, such as square place, the hiding danger to non-cooperation object
Product are used for quickly detecting the safety check apparatus that cannot then use the above-mentioned type outside certain safe distance, at present also without effective
Technological means carry out remote safety check.
The content of the invention
The present invention is in order to solve the above technical problems, to propose a kind of remote human body based on radar target polarization characteristic hidden
Hazardous material detection instrument is hidden, relatively existing safety check apparatus can realize remote detection in real time, can also be to being in open place
Dense crowd be monitored, need not be particularly limited to checked object position, action, be not required checked object actively match somebody with somebody
It closes, operating distance can cover 5 ~ 100 meters.
Three characteristics of the invention that mainly make use of millimeter wave/Terahertz radar：
（1）Millimeter wave/Terahertz radar has good penetrability to most of clothing, but can not penetrate metal and people
The substances such as body skin；
（2）After radar emission linear polarization probing wave is irradiated to target, the polarization direction of the echo of part energy can become
Intersect with incidence wave polarization direction.Cross polarization echo strength has very big difference due to the difference of target, when radar illumination is to slightly
When rough superficial objects or edge are than relatively sharp target, such as gun and dagger etc., it is returned with what transmitted wave polarization direction was intersected
Wave energy can significantly increase；
（3）Millimeter wave/Terahertz frequency is high, easily generates the signal of big bandwidth, can realize to the high-precision of target range
Degree measurement.Meanwhile the shortening of wavelength that the raising of frequency is brought can make system relatively be increased using the antenna of reduced size
Benefit is conducive to reduce whole system volume.
Be based on more than characteristic, by emitting radar detection signal to detected object, in reflection echo with transmitting signal
Co polarized component and cross polar component are received respectively by two-way reception antenna, by counting the Energy distribution of multiecho, just
It is possible that detecting whether detected object carries dangerous goods and the substantially classification of hazard recognition product.
When systemic effect is distant, echo-signal energy dropoff.In order to improve the signal-to-noise ratio of signal, surrounding is filtered out
The interference of environment improves systemic effect distance, and using wideband correlation as detection waveform, this design brings as follows
Some advantage：
（1）The high-precision distance dimension information of detected object can be obtained.It is suitable by selecting in data processing
The backward energy of distance is calculated and filters out the interference of the clutter not in this distance, improves the noise of target echo
Than so as to improve the correct probability of system detectio；
（2）Additional compression gains can be brought to signal by pulse squeeze operation, further improve signal-to-noise ratio.It is based on
The wideband dual polarized remote human body hidden dangerous goods real-time detector structure below figure of millimeter wave/Terahertz of more than characteristic design
It is shown.System separates structure using dual-mode antenna, No. three antennas is shared, including one using full coherent wideband radar framework
Road transmitting antenna and two-way reception antenna.Transmitting antenna is horizontal polarization；It is all the way horizontal polarization in reception antenna, is vertical all the way
Straight polarization.Systematic selection wideband correlation is as probing wave, to realize the high-acruracy survey to target range, and energy
Environment noise jamming is enough reduced, improves signal-to-noise ratio.System receives structure using zero intermediate frequency, and oblique method is gone by broadband using simulation
Echo-signal is converted to narrowband intermediate frequency pulse signal.
Linear frequency modulation emits signal
Wherein,Centered on frequency,For pulsewidth,For frequency modulation rate,For it is fast when
Between,For integer,Pulse repetition period,For the slow time, t is all times.
During simulation is gone tiltedly, reference signal makees conjugate multiplication with echo in frequency mixer, that is, makees difference frequency processing, and echo becomes
Into simple signal, and its frequency is directly proportional to the range difference of echo and reference signal, thus is also the frequency modulation processing of solution line, frequency
It is worth and is.Therefore, Fourier transform is made to the signal after solution line frequency modulation, corresponding each echo can be obtained in frequency domain
'sThe burst pulse of shape, pulse width are, and pulse position is directly proportional to R.Its resolution ratio is：
Wherein, c is the light velocity, and B is the bandwidth of radar transmitting wave.If radar emission band is wider than 15GHz, then system is just
The object that thickness is more than 1 centimetre can be differentiated.In low-frequency range, so high bandwidth is extremely difficult to, but works as working frequency range
For Terahertz when, it is easy to obtain the waveform of high bandwidth.
Technical scheme is as follows：
A kind of remote human body hidden dangerous goods detector based on radar target polarization characteristic, it is characterised in that：Including
Aobvious control end, signal processing and control module, linear frequency modulation source module, transmitting-receiving frequency multiplication link module, clock distribution module, intermediate frequency are put
Big filter module, signal acquisition module；
Aobvious control end, for receiving gathered data and sending operation control instruction；
Signal processing and control module for receiving the gathered data of signal acquisition module upload, carry out gathered data
Aobvious control end is uploaded to after Digital Signal Processing；For receiving the configuration order and control command at aobvious control end, whole system is configured
Running parameter completes the operation that user specifies；
Linear frequency modulation source module, for providing linear FM signal for transmitting-receiving frequency multiplication link module；
Frequency multiplication link module is received and dispatched, for the linear FM signal frequency multiplication that provides linear frequency modulation source module to designated frequency band
Afterwards, be radiated detected object after amplification, after the reflection echo of detected object is received, successively by amplification, mixing,
Simulation goes tiltedly to become narrowband intermediate frequency signal, is then transmitted to intermediate frequency amplification filter module；
Clock distribution module, for providing required clock for all modules of system, to ensure the phase of whole system
Ginseng property；
Intermediate frequency amplifies filter module, and the intermediate-freuqncy signal for that will receive and dispatch frequency multiplication link module transfer is filtered and amplifies
It is then transmit to signal acquisition module；
Signal acquisition module for the signal of intermediate frequency amplification filter module transmission to be carried out analog to digital conversion, is then input to
Signal processing and control module.
After the aobvious control end receives gathered data, testing result is obtained after being handled using detection algorithm；Behaviour as system
Make interface and status display interface, user can understand system running state by the module, and send operational order control
System operation.Display and control software is operated on a PC, passes through USB or cable interface and signal processing and control module
Connection.
The workflow of the detection algorithm is as follows：
A) reference database is established.For example, ten people for not carrying dangerous material is selected to make references object as with reference to object
It stands in specified distance and it is detected, the echo for gathering these references object obtains the distribution of its echo strength, because returning
Intensity of wave is proportional to 1/R4, R is detected object distance, does normalized to echo strength with distance, i.e. echo strength multiplies
With R4.It is used to judge detected object whether with dangerous material using the data of acquisition as signal is referred to.
B) detected object is detected, repeated detection obtains several echo strength values, equally to echo strength with away from
From doing normalized.
C) compare the distribution of detected object echo strength and reference signal echo strength, if with transmitting antenna polarization side
Being more than reference signal or two-way echo signal intensity to vertical echo signal intensity average, to be all higher than reference signal strength equal
Value, then can determine whether that detected object may carry dangerous material.It carries the probability of dangerous material and echo strength and reference signal
The difference of intensity is directly proportional.
The signal processing connects with control module by high performance digital signal processing chip and with the communication of other modules
Mouth is formed, and concrete function is：
a）The gathered data that signal acquisition module uploads is received, is uploaded to after Digital Signal Processing by communication interface
Aobvious control end；
B) configuration order at aobvious control end is received, by configuring whole system running parameter with the communication interface of other modules；
c）The control command at aobvious control end is received, is referred to by completing user with the communication interface and trigger signal of other modules
Fixed operation.
The communication interface of the signal processing and control module is：
Two-way trigger signal connects signal acquisition module and linear frequency modulation source module, when working for whole system respectively
It is synchronous；
FM source control interface, for configuring the running parameter of LFM Source module；
Gathered data uploads interface, for receiving the gathered data of signal acquisition module；
Acquisition module control interface, for configuring the running parameter of signal acquisition module；
Intermediate-frequency gain control interface, for controlling the gain of intermediate frequency amplification filter module.
The echo of the linear FM signal of detected object outside certain distance becomes one after tiltedly processing is gone in simulation
Then intermediate frequency narrow band signal is acquired, it is necessary to become low frequency signal after level-one down coversion, can also utilize high-speed AD into
After row acquisition Digital Down Convert is carried out using digital signal processing method.To keep system flexibility, when system design, employs
Later approach.Signal is uploaded to signal processing and control module after high-speed ADC gathers, at high performance digital signal
It manages chip and completes the down coversion of signal and down-sampled operation, to reduce data transfer rate.It is optimization filter to need the purpose that two-way FIR is filtered
Ripple device running parameter obtains higher attenuation outside a channel, and can save hardware logic resource.After FFT transform, data
Become the intensity distribution signal of distance dimension, two paths of signals packing is uploaded to display and control software by communication interface is further located
Reason.
The linear frequency modulation source module exports three-route FM signal, and linear FM signal is input to transmitting frequency multiplication all the way
Link, another two-way linear FM signal are separately input to two-way and receive frequency multiplication link.The pulse width of linear FM signal, work
The parameters such as cycle and bandwidth can be configured by FM source control interface.
The linear FM signal of transmitting frequency multiplication link is input to, is amplified by power amplifier, then by transmitting antenna spoke
It is shot out, is radiated the reflection echo formed after detected object and is received by reception antenna, then put by low-noise amplifier
Greatly, completed simulation by being mixed with the linear FM signal after receiving frequency multiplication link frequency multiplication in harmonic mixer and gone
Tiltedly operation, becomes narrowband intermediate frequency signal, is transmitted to intermediate frequency amplification filter module.
The transmitting antenna is related with operating distance with the beam angle of reception antenna.System design maximum operating range exists
100 meters, the requirement that can cover a people in 100 meters of distances according to antenna main lobe calculates, and design antenna main lobe width is 1.1
Degree.
The clock distribution module uses reference of the constant-temperature crystal oscillator as clock distribution module, to ensure clock signal matter
Amount.
For intermediate frequency is avoided to amplify the amplifier saturation in filter module, intermediate frequency can be controlled by intermediate-frequency gain control interface
Amplify the amplification factor of filter module.
The core component of the signal acquisition module is two-way high-speed ADC.
The course of work of the system is as follows：
（1）Configure system operational parameters
After system starts, configured at display and control software interface by the communication interface between signal processing and control module
The running parameter of system, including pulse width, pulse period, the frequency of pulse number NCO, intermediate-frequency gain multiple, FIR filter
Parameter and data extraction yield.After signal processing receives parameter configuration order with control module, order is parsed, is beaten again
It wraps and passes through its interface between each submodule and order is handed down to each submodule with specified format.Submodule receives finger
Running parameter configuration is completed after order.
（2）It is detected
Operator, which sends, starts detection instruction, and detector is aligned detected object.
After starting detection, signal processing is sent to linear frequency modulation source module with the specified pulse period with control module and triggered
Signal, LFM Source receive and the linear FM signal of generation are sent to transmitting-receiving frequency multiplication link module after trigger signal,
Pulse width and exomonental number are specified in system operational parameters configuration phase.
Emit frequency multiplication link module by the signal frequency multiplication that linear frequency modulation source module inputs to system working frequency range, by amplification
It is gone out afterwards by aerial radiation.
After probing wave is reflected by detected object, the polarization direction of echo may change.Utilize two-way reception antenna
Echo-signal that is identical with probing wave polarization direction and intersecting with probing wave polarization direction is received respectively.The two-way echo of reception
Signal is mixed after low-noise amplifier amplification in harmonic mixer with linear FM signal, is completed simulation and is gone
Oblique process becomes intermediate frequency narrow band signal, inputs to intermediate frequency amplification module.
Intermediate frequency amplification module two paths of signals is amplified and filtering operation after, will treated that signal is inputted to signal
Acquisition module.
Signal acquisition module utilizes high-speed ADC, carries out analog to digital conversion to the amplified intermediate-freuqncy signal of two-way, and passes through acquisition
Data are uploaded to signal processing and control module by data upload interface.
Signal processing and control module start to receive in each incipient stage pulse period gathered data, receiving time with
Pulse width time is identical.The gathered data received passes through Digital Down Convert, after filtering and extraction operation, is packaged and passes through
Data are uploaded to display and control software by communication interface.
（3）Data processing shows testing result
After display and control software receives gathered data, since the echo spectrum of detected object is narrowband, ambient enviroment
The interference that clutter is brought designs a bandpass filter using digital signal processing method or only analyzes outside this frequency range
The intensity of the corresponding signal of corresponding one section of frequency spectrum at distance is detected where object, to achieve the purpose that reduce noise jamming, is led to
Whether the distribution for crossing the intensity value of the two-way difference polar echo of statistics detected object may determine that detected object with danger
Dangerous product.
So far, detection process terminates.
Beneficial effects of the present invention are as follows：
Present invention is generally directed to the objects that non-cooperation carries out safety check, do not have special limitation for application places, relatively existing
Some safety check apparatus can realize remote detection, can also the Dense crowd for being in open place be detected, need not spy
Not Xian Ding checked object position, action, be not required checked object cooperate on one's own initiative, operating distance can cover 5 ~ 100 meters,
Real-time detection especially suitable for the big and open place of flow of the people；The present invention is using multiple emission detection signal and counts tested
Surveying the method for the distribution of the intensity value of the orthogonal two-way echo of object can effectively detect whether detected object carries
Dangerous product；Echo high-precision distance dimension information is obtained using the system architecture and wideband correlation of full coherent, favorably
In improving signal-to-noise ratio, the interference of ambient enviroment clutter is filtered out.
Description of the drawings
Fig. 1 is the system overall architecture schematic diagram of the present invention；
Fig. 2 is the detection workflow schematic diagram of the present invention；
Fig. 3 is the Digital Signal Processing flow diagram of the present invention.
Specific embodiment
As shown in Figure 1, a kind of remote human body hidden dangerous goods detector based on radar target polarization characteristic, including aobvious
Control end, signal processing and control module, linear frequency modulation source module, transmitting-receiving frequency multiplication link module, clock distribution module, intermediate frequency amplification
Filter module, signal acquisition module,；
Aobvious control end, for receiving gathered data and sending operation control instruction；
Signal processing and control module for receiving the gathered data of signal acquisition module upload, carry out gathered data
Aobvious control end is uploaded to after Digital Signal Processing；For receiving the configuration order and control command at aobvious control end, whole system is configured
Running parameter completes the operation that user specifies；
Linear frequency modulation source module, for providing linear FM signal for transmitting-receiving frequency multiplication link module；
Frequency multiplication link module is received and dispatched, for the linear FM signal frequency multiplication that provides linear frequency modulation source module to designated frequency band
Afterwards, be radiated detected object after amplification, after the reflection echo of detected object is received, successively by amplification, mixing,
Simulation goes tiltedly to become narrowband intermediate frequency signal, is then transmitted to intermediate frequency amplification filter module；
Clock distribution module, for providing required clock for all modules of system, to ensure the phase of whole system
Ginseng property；
Intermediate frequency amplifies filter module, and the intermediate-freuqncy signal for that will receive and dispatch frequency multiplication link module transfer is filtered and amplifies
It is then transmit to signal acquisition module；
Signal acquisition module for the signal of intermediate frequency amplification filter module transmission to be carried out analog to digital conversion, is then input to
Signal processing and control module.
After the aobvious control end receives gathered data, testing result is obtained after being handled using detection algorithm；Behaviour as system
Make interface and status display interface, user can understand system running state by the module, and send operational order control
System operation.Display and control software is operated on a PC, passes through USB or cable interface and signal processing and control module
Connection.
As shown in Fig. 2, the workflow of the detection algorithm is as follows：
A) reference database is established.For example, ten people for not carrying dangerous material is selected to make references object as with reference to object
It stands in specified distance and it is detected, gather these and obtain the distribution of its echo strength with reference to the echo of object to be measured, because
1/R is proportional to for echo strength4, R is object to be measured distance, and normalized, i.e. echo strength are done with distance to echo strength
It is multiplied by R4.It is used to judge object to be measured whether with dangerous material using the data of acquisition as signal is referred to.
B) detected object is detected, repeated detection obtains several echo strength values, equally to echo strength with away from
From doing normalized.
C) compare the distribution of detected object echo strength and reference signal echo strength, if with transmitting antenna polarization side
Being more than reference signal or two-way echo signal intensity to vertical echo signal intensity average, to be all higher than reference signal strength equal
Value, then can determine whether that detected object may carry dangerous material.It carries the probability of dangerous material and echo strength and reference signal
The difference of intensity is directly proportional.
The signal processing connects with control module by high performance digital signal processing chip and with the communication of other modules
Mouth is formed, and concrete function is：
a）The gathered data that signal acquisition module uploads is received, is uploaded to after Digital Signal Processing by communication interface
Aobvious control end；
B) configuration order at aobvious control end is received, by configuring whole system running parameter with the communication interface of other modules；
c）The control command at aobvious control end is received, is referred to by completing user with the communication interface and trigger signal of other modules
Fixed operation.
The communication interface of the signal processing and control module is：
Two-way trigger signal connects signal acquisition module and linear frequency modulation source module, when working for whole system respectively
It is synchronous；
FM source control interface, for configuring the running parameter of LFM Source module；
Gathered data uploads interface, for receiving the gathered data of signal acquisition module；
Acquisition module control interface, for configuring the running parameter of signal acquisition module；
Intermediate-frequency gain control interface, for controlling the gain of intermediate frequency amplification filter module.
The echo of the linear FM signal of detected object outside certain distance becomes one after tiltedly processing is gone in simulation
Then intermediate frequency narrow band signal is acquired, it is necessary to become low frequency signal after level-one down coversion, can also utilize high-speed AD into
After row acquisition Digital Down Convert is carried out using digital signal processing method.To keep system flexibility, when system design, employs
Later approach.Signal is uploaded to signal processing and control module after high-speed ADC gathers, at high performance digital signal
It manages chip and completes the down coversion of signal and down-sampled operation, to reduce data transfer rate, flow is as shown in Figure 3.Two-way FIR is needed to filter
The purpose of ripple is Optimal Filter running parameter, obtains higher attenuation outside a channel, and can save hardware logic resource.By
After FFT transform, data become the intensity distribution signal of distance dimension, and two paths of signals is packaged and is uploaded to aobvious control by communication interface
Software is further processed.
The linear frequency modulation source module exports three-route FM signal, and linear FM signal is input to transmitting frequency multiplication all the way
Link, another two-way linear FM signal are separately input to two-way and receive frequency multiplication link.The pulse width of linear FM signal, work
The parameters such as cycle and bandwidth can be configured by FM source control interface.
The linear FM signal of transmitting frequency multiplication link is input to, is amplified by power amplifier, then by transmitting antenna spoke
It is shot out, is radiated the reflection echo formed after detected object and is received by reception antenna, then put by low-noise amplifier
Greatly, completed simulation by being mixed with the linear FM signal after receiving frequency multiplication link frequency multiplication in harmonic mixer and gone
Tiltedly operation, becomes narrowband intermediate frequency signal, is transmitted to intermediate frequency amplification filter module.
The transmitting antenna is related with operating distance with the beam angle of reception antenna.System design maximum operating range exists
100 meters, as long as antenna main lobe width can cover a people, design antenna main lobe width is 1.1 degree.
The clock distribution module uses reference of the constant-temperature crystal oscillator as clock distribution module, to ensure clock signal matter
Amount.
For intermediate frequency is avoided to amplify the amplifier saturation of filter module, intermediate frequency can be controlled to put by intermediate-frequency gain control interface
The amplification factor of big filter module.
The core component of the signal acquisition module is two-way high-speed ADC.
The course of work of the system is as follows：
（1）Configure system operational parameters
After system starts, configured at display and control software interface by the communication interface between signal processing and control module
The running parameter of system, including pulse width, pulse period, the frequency of pulse number NCO, intermediate-frequency gain multiple, FIR filter
Parameter and data extraction yield.After signal processing receives parameter configuration order with control module, order is parsed, is beaten again
It wraps and passes through its interface between each submodule and order is handed down to each submodule with specified format.Submodule receives finger
Running parameter configuration is completed after order.
（2）It is detected
Operator, which sends, starts detection instruction, and detector is aligned detected object.
After starting detection, signal processing is sent to linear frequency modulation source module with the specified pulse period with control module and triggered
Signal, LFM Source receive and the linear FM signal of generation are sent to transmitting-receiving frequency multiplication link module after trigger signal,
Pulse width and exomonental number are specified in system operational parameters configuration phase.
Emit frequency multiplication link module by the signal frequency multiplication that linear frequency modulation source module inputs to system working frequency range, by amplification
It is gone out afterwards by aerial radiation.
After probing wave is reflected by detected object, the polarization direction of echo may change.Utilize two-way reception antenna
Echo-signal that is identical with probing wave polarization direction and intersecting with probing wave polarization direction is received respectively.The two-way echo of reception
Signal is mixed after low-noise amplifier amplification in harmonic mixer with linear FM signal, is completed simulation and is gone
Oblique process becomes intermediate frequency narrow band signal, inputs to intermediate frequency amplification module.
Intermediate frequency amplification module two paths of signals is amplified and filtering operation after, will treated that signal is inputted to signal
Acquisition module.
Signal acquisition module utilizes high-speed ADC, carries out analog to digital conversion to the amplified intermediate-freuqncy signal of two-way, and passes through acquisition
Data are uploaded to signal processing and control module by data upload interface.
Signal processing and control module start to receive in each incipient stage pulse period gathered data, receiving time with
Pulse width time is identical.The gathered data received passes through Digital Down Convert, after filtering and extraction operation, is packaged and passes through
Data are uploaded to display and control software by communication interface.
（3）Data processing shows testing result
After display and control software receives gathered data, since the echo spectrum of detected object is a narrow-band impulse, week
The interference that collarette border clutter is brought outside this frequency range, using digital signal processing method design a bandpass filter or
Only where analysis detection object at distance the corresponding signal of corresponding one section of frequency spectrum intensity, to reach the mesh for reducing noise jamming
, the distribution of the intensity value of the two-way difference polar echo by counting detected object may determine that detected object whether band
Dangerous product.
So far, detection process terminates.
Claims (9)
1. a kind of remote human body hidden dangerous goods detector based on radar target polarization characteristic, it is characterised in that：Including aobvious
Control end, signal processing and control module, linear frequency modulation source module, transmitting-receiving frequency multiplication link module, clock distribution module, intermediate frequency amplification
Filter module, signal acquisition module；
Aobvious control end, for receiving gathered data and sending operation control instruction；
For receiving the gathered data of signal acquisition module upload, number is carried out to gathered data for signal processing and control module
Aobvious control end is uploaded to after signal processing；For receiving the configuration order and control command at aobvious control end, the work of whole system is configured
Parameter completes the operation that user specifies；
Linear frequency modulation source module, for providing linear FM signal for transmitting-receiving frequency multiplication link module；
Frequency multiplication link module is received and dispatched, after linear FM signal frequency multiplication that linear frequency modulation source module is provided to designated frequency band,
Detected object is radiated after amplification, after the reflection echo of detected object is received, successively by amplification, mixing, mould
Plan goes tiltedly to become narrowband intermediate frequency signal, is then transmitted to intermediate frequency amplification filter module；
Clock distribution module, for providing required clock for all modules of system；
Intermediate frequency amplifies filter module, and the intermediate-freuqncy signal for that will receive and dispatch frequency multiplication link module transfer is filtered and amplifies then
It is transmitted to signal acquisition module；
Signal acquisition module for the signal of intermediate frequency amplification filter module transmission to be carried out analog to digital conversion, is then input to signal
Processing and control module；
The linear frequency modulation source module exports three-route FM signal, and linear FM signal is input to transmitting frequency multiplier chain all the way
Road, another two-way linear FM signal are separately input to two-way and receive frequency multiplication link；For being input to the linear of transmitting frequency multiplication link
FM signal is amplified by power amplifier, is then radiate by transmitting antenna, be radiated after detected object formed it is anti-
It is emitted back towards ripple to be received by reception antenna, then amplify by low-noise amplifier, by receiving frequency multiplication with passing through in harmonic mixer
Linear FM signal after link frequency multiplication is mixed, and is completed simulation and is gone tiltedly to operate, becomes narrowband intermediate frequency signal, be transmitted to intermediate frequency
Amplify filter module.
2. a kind of remote human body hidden dangerous goods detection based on radar target polarization characteristic according to claim 1
Instrument, it is characterised in that：After the aobvious control end receives gathered data, testing result is obtained after being handled using detection algorithm.
3. a kind of remote human body hidden dangerous goods detection based on radar target polarization characteristic according to claim 2
Instrument, it is characterised in that：The workflow of the detection algorithm is as follows：
A) reference database is established, selection is several with reference to detected object, and references object is made to be located at specified distance and is visited
It surveys, the reflection echo for gathering the references object obtains echo strength distribution, does normalized with distance to echo strength and obtains
Corresponding data is obtained, is used to judge detected object whether with dangerous material using corresponding data as signal is referred to；
B) detected object is detected, repeated detection obtains several echo strength values, and equally echo strength is done with distance
Normalized；
C) distribution of detected object echo strength and reference signal echo strength is compared, if hung down with transmitting antenna polarization direction
Straight echo signal intensity average is more than reference signal or two-way echo signal intensity is all higher than reference signal strength average,
It then can determine whether that detected object may carry dangerous material；The probability for carrying dangerous material and echo strength and reference signal
The difference of intensity is directly proportional.
4. a kind of remote human body hidden dangerous goods detection based on radar target polarization characteristic according to claim 1
Instrument, it is characterised in that：The signal processing and control module by high performance digital signal processing chip and with other modules
Communication interface is formed, and concrete function is：
a）The gathered data that signal acquisition module uploads is received, aobvious control is uploaded to by communication interface after Digital Signal Processing
End；
B) configuration order at aobvious control end is received, by configuring whole system running parameter with the communication interface of other modules；
c）The control command at aobvious control end is received, by completing what user specified with the communication interface and trigger signal of other modules
Operation.
5. a kind of remote human body hidden dangerous goods detection based on radar target polarization characteristic according to claim 4
Instrument, it is characterised in that：The communication interface of the signal processing and control module is：
Two-way trigger signal connects signal acquisition module and linear frequency modulation source module respectively, synchronous when working for whole system；
FM source control interface, for configuring the running parameter of LFM Source module；
Gathered data uploads interface, for receiving the gathered data of signal acquisition module；
Acquisition module control interface, for configuring the running parameter of signal acquisition module；
Intermediate-frequency gain control interface, for controlling the gain of intermediate frequency amplification filter module.
6. a kind of remote human body hidden dangerous goods detection based on radar target polarization characteristic according to claim 1
Instrument, it is characterised in that：The clock distribution module uses reference of the constant-temperature crystal oscillator as clock distribution module.
7. a kind of remote human body hidden dangerous goods detection based on radar target polarization characteristic according to claim 1
Instrument, it is characterised in that：The intermediate-frequency gain control interface is additionally operable to the amplification factor of control intermediate frequency amplification filter module.
8. a kind of remote human body hidden dangerous goods detection based on radar target polarization characteristic according to claim 1
Instrument, it is characterised in that：The core component of the signal acquisition module is two-way high-speed ADC.
9. a kind of remote human body hidden dangerous goods detection based on radar target polarization characteristic according to claim 4
Instrument, it is characterised in that the course of work of system is as follows：
（1）After system starts, system is configured by the communication interface between signal processing and control module at aobvious control end
Running parameter, including pulse width, the pulse period, the frequency of pulse number NCO, intermediate-frequency gain multiple, FIR filter parameter and
Data pick-up rate；After signal processing receives parameter configuration order with control module, order is parsed, repacks and leads to
It crosses its interface between each submodule and will order and modules are handed down to specified format, modules receive complete after instruction
It is configured into running parameter；
（2）After starting detection, signal processing is sent to linear frequency modulation source module with the specified pulse period with control module and triggered
Signal, linear frequency modulation source module receive and the linear FM signal of generation are sent to transmitting-receiving frequency multiplication link mould after trigger signal
Block；
Emit frequency multiplication link module by the linear frequency modulation local oscillation signal frequency multiplication that linear frequency modulation source module inputs to system working frequency range,
Probing wave is formed after amplification to radiate by transmitting antenna；
After probing wave is reflected by detected object, the polarization direction of echo may change；Distinguished using two-way reception antenna
Receive echo-signal that is identical with probing wave polarization direction and intersecting with probing wave polarization direction；The two-way echo-signal of reception
Respectively after low-noise amplifier amplification, it is mixed respectively in two harmonic mixers with linear FM signal, it is complete
Oblique process is gone into simulation, becomes intermediate frequency narrow band signal, is separately input into intermediate frequency amplification filter module；
Intermediate frequency amplification filter module two-way intermediate frequency narrow band signal is amplified and filtering operation after, will treated that signal is defeated
Enter to signal acquisition module；
Signal acquisition module carries out analog to digital conversion to the amplified intermediate frequency narrow band signal of two-way, and passes through gathered data and upload interface
Data are uploaded to signal processing and control module；
Signal processing starts to receive gathered data, receiving time and pulse in each incipient stage pulse period with control module
Spaced time is identical；The gathered data received is packaged after Digital Down Convert, filtering and extraction operation and passes through communication
Data are uploaded to aobvious control end by interface；
（3）After aobvious control termination receives gathered data, the intensity value of the two-way difference polar echo by counting detected object
Distribution may determine that detected object whether with dangerous material；
So far, detection process terminates.
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