CN106772666B - A kind of new violation electronic equipment detection system and detection method - Google Patents
A kind of new violation electronic equipment detection system and detection method Download PDFInfo
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Abstract
The invention discloses a kind of new violation electronic equipment detection systems and detection method, detection system includes the computer connecting respectively with FPGA signal processing and control panel, the first transmitting module, the second transmitting module, Receiver Module and Magnetic Sensor, and first transmitting module is successively connect with ten throw switch of the first hilted broadsword, the first bandpass filter and the first transmitting antenna；Second transmitting module is successively connect with ten throw switch of the second hilted broadsword, the second bandpass filter and the second transmitting antenna；The Receiver Module is successively connect with ten throw switch of broadband hilted broadsword, broadband filter and receiving antenna.The present invention is able to satisfy the demand of violation electronic equipment detection performance, it can be while guaranteeing that misinformation probability is lower, to solve the problems, such as that existing metal detector is high to violation electronic product rate of failing to report height and to carry-on metal product rate of false alarm, effective detection of violation electronic product is realized.
Description
Technical field
The present invention relates to a kind of Harmonic Detection and Magnetic Detection Systems, more particularly to a kind of bimodulus safety check door system.
Background technique
Popularizing with various intelligent electronic devices in recent years, electronic equipment, which is divulged a secret, is becoming approach of divulging a secret newly, at
For maximum security risk.Each important department and place may be subjected to from external various electronic equipment burglary, steal secret information, surreptitiously
The threat listened.Anti- secret leaking management for concerning security matters environment, by management means, information-based means there are high investment, cannot be complete
Complete effective, postmortem influences the various drawbacks such as normal transaction processing.Existing safety check technology is broadly divided into following several:
1) metal magnetic detection；2) X-ray machine detects；3) non-linear knot detection and 4) " mm-wave imaging " technology etc..However, being directed to electronics
The problem of equipment detects, mostly uses metal magnetic detection and non-linear knot Detection Techniques.Existing metal detection is in detection electronics
Equipment aspect has its limitation, such as: SD card, plastic housing USB flash disk, their magnetic induction characteristic is very faint, is difficult by metal detection
Door detected, such as using the method for improving sensitivity, it will the false alarm rate of safe examination system is caused sharply to increase.Based on non-linear
The Britain AUDIOTEL detection door for tying Detection Techniques uses single-frequency system, and fundamental frequency is close to gsm communication frequency, therefore, connects
The collection of letters number is easy to be influenced by mobile communication signal, so that the detection door anti-interference ability sharply declines, and expensive.It will
" mm-wave imaging " technology differentiates suspicious item by the way that measured object is imaged from image.The present invention is solid using measured object
Some nonlinear scattering characteristics and magnetic properties realize the target of safety detection, can effectively realize SD card, pinhole cameras, U
The detection of the electronic products such as disk, mobile phone, camera, tapping device.
The development of non-linear PIN Junction detector PIN has benefited from the discovery and further investigation of harmonic wave re radiation effects.Early in 20th century 30
Age Mo, people just confirm the presence of harmonic wave re radiation effects, but also unclear for generating the principle of this effect at that time
Chu.Until the 1970s is with the development of Radar Technology and the raising of measuring technology, people are just gradually to harmonic wave re-radiation
The principle of effect has further research --- propose the physical model of Nonlinear Parameter.And go out from the viewpoint of nonlinear network
Hair, establishes the network model of non-linear contact, studies the relationship of incident electromagnetic wave and scattering electromagnetic wave by network model to count
Calculate the transfer function of non-linear contact.
Existing research the result shows that: under single frequency mode, mainly by the way of receiving second harmonic triple-frequency harmonics, partly lead
The second harmonic energy of body PN junction is most strong, and triple-frequency harmonics takes second place；Artificial metal's knot is main to generate odd harmonic, wherein triple-frequency harmonics
Energy is most strong.And under double frequency mode, main using composite wave form is received, secondary composite wave current amplitude is secondary single-frequency
2 times of rate harmonic current amplitude, i.e., secondary combination wave power can increase by 4 times；Composite wave current amplitude is unifrequency three times three times
3 times of harmonic current amplitude, i.e., combination wave power can increase by 9 times three times.
The research of harmonic wave re radiation effects promotes the development and application of non-linear PIN Junction detector PIN.The 1990s with
Before, non-linear PIN Junction detector PIN is mainly worked with single frequency mode, such as: foreign countries were using the U.S. as the ISR company of representative, in 70,80 years
Dai Shi is proposed high-power triple-frequency harmonics Ground Penetrating Radar respectively --- METRRA metal reradiation radar and BOOMERANG1-3 type
Microcircuit detector.The MCD-1 metallic contact detector that the 50th research institute, domestic China Electronics's science and technology group releases, it is above several
Biometallic joint detector is all one hair mode of a simple receipts, and function is simple, and sensitivity is not high enough, and volume is big, quality weight.
After the 1990s, each state all begins one's study second harmonic, triple-frequency harmonics composite radar, this is because adopting
After composite wave mode, the detection range of harmonic radar on the one hand can be improved, on the other hand due to combine wave power increase,
False alarm rate can be substantially reduced.Such as the BOOMERANG4-5 type microcircuit detector of ISR company, AUDIOTEL company, Britain
The non-linear PIN Junction detector PIN of Super Broom, the NR900E radio positioner of Russia, China Electronic Science and Technology Corporation the 50th
The TZD95B of research institute.These detectors increase on receiver sensitivity, detection range, distinguish with certain target
Ability, the disadvantage is that volume is larger, it is heavier.With the development of microwave integrated circuit, non-linear PIN Junction detector PIN transmitter working frequency range
Also change takes place, is gradually developed from traditional L-band to S-band, it is most commonly seen with 880~920M wave band in L-band, it deposits
The problems such as target shape is larger detecting, and can not position miniature target and detector volume is larger, heavier-weight, inconvenient to carry.
And Lithuania's last word works in S-band, such as: Lorgnette-24 working frequency 2400MHz~2483MHz, weight are
0.65kg, small volume, weight is lighter, convenient for hand-held.Lorgnette-36 working frequency 3580MHz~3620MHz, weight are
1.4Kg, transmission power are adjustable.In the non-linear PIN Junction detector PIN of S-band, there are following features: 1) due to frequency height, can promote to visit
It surveys device and detects the smaller Nonlinear Parameter of target size, such as: the SIM of 1*2cm, this is because coming from the scattering property of target
See, when target size be greater than wavelength when, target to electromagnetic wave based on scattering, supplemented by diffraction, effective scattering area of target
Greatly, the frequency of S-band is higher than L-band frequency, and wavelength is short, it is easier to detect the Nonlinear Parameter of miniaturization.2) high band
It uses, while also bringing the compact in size of antenna and passive device.Existing violation electronic product detecting system is in reality
More problem is encountered in；1) key, belt fastener, carry-on metal decoration etc. make the false alarm rate of detection system higher；2)
It is influenced by surrounding enviroment more serious；3) the problems such as undesirable to the detection effect for shielding preferable electronic product.
Summary of the invention
In order to overcome the disadvantages mentioned above of the prior art, the present invention provides a kind of new violation electronic equipment detection system and
Detection method is able to satisfy the demand of violation electronic equipment detection performance, can be existing to solve while guaranteeing that misinformation probability is lower
There is the problem that metal detector is high and high to carry-on metal product rate of false alarm to violation electronic product rate of failing to report, realizes violation electronics
Effective detection of product.
The technical solution adopted by the present invention to solve the technical problems is: a kind of new violation electronic equipment detection system,
Including the computer, the first transmitting module, the second transmitting module, radio frequency reception being connect respectively with FPGA signal processing and control panel
Module and Magnetic Sensor, first transmitting module are successively sent out with ten throw switch of the first hilted broadsword, the first bandpass filter and first
Penetrate antenna connection；Second transmitting module successively emits day with ten throw switch of the second hilted broadsword, the second bandpass filter and second
Line connection；The Receiver Module is successively connect with ten throw switch of broadband hilted broadsword, broadband filter and receiving antenna.
The present invention also provides a kind of new violation electronic equipment detection methods, include the following steps:
Step 1: carrying out AD quantization to magnetic anomaly regular signal harmony wave signal；
Step 2: carrying out pretreatment and feature extraction to magnetic anomaly regular signal harmony wave signal；
Step 3: carrying out target detection using dual mode data Fusion Features.
Compared with prior art, the positive effect of the present invention is:
1) invention is greater than 85% to the detection probability of the equipment such as mobile phone, eavesdropping burglary equipment, camera, USB flash disk, hard disk,
The influence of the magnetic medium to detection performance with oneself such as belt, key can be effectively excluded, rate of false alarm is less than 10%；
2) strong antijamming capability does not involve the influence of magnetic disturbance signal vulnerable to external electromagnetic；
3) system sensitivity is high, and Harmonic Detection sensitivity is better than -130dBm；
4) modular designs, detection system is light-weight, is easy to transport and dismount；
5) invention can provide technical precaution means for the safe and secret work of important department.
Detailed description of the invention
Examples of the present invention will be described by way of reference to the accompanying drawings, in which:
Fig. 1 is the connection block diagram of electrical device of the invention；
Fig. 2 is sensor of the invention schematic layout pattern；
Fig. 3 is sensor of the invention genesis analysis figure；
Fig. 4 is signal processing flow figure of the invention.
Specific embodiment
A kind of new violation electronic equipment detection system, including pedestal, sensing door-plate and door body top plate, pedestal and sensing door
It is connected respectively with screw between plate, between sensing door-plate and door body top plate.Electrical device module is set in the base, using metal
Material is electromagnetically shielded pedestal；Antenna element and Magnetic Sensor are set on sensing door-plate, and light alerts region and sound is accused
Police region domain is separately positioned on sensing door-plate and pedestal.
The connection block diagram of electrical device module is as shown in Figure 1, include that FPGA signal processing and control panel 1, first emit mould
Block 2, the second transmitting module 3, ten throw switch 4 of the first hilted broadsword, ten throw switch 5 of the second hilted broadsword, the first bandpass filter 6, the second band
Bandpass filter 7, Receiver Module 8, ten throw switch 9 of broadband hilted broadsword, broadband filter 10, power module 11, first emit day
Line 12, the second transmitting antenna 13, receiving antenna 14 and audible and visual alarm drive module 15 etc., in which:
First transmitting module 2 to frequency f1 and puts the DA1 signal up-conversion of FPGA signal processing and control panel 1
Greatly；Second transmitting module 3 to frequency f2 and amplifies the DA2 signal up-conversion of FPGA signal processing and control panel 1；First
The frequency of ten throw switch 4 of hilted broadsword is f1, the frequency of ten throw switch 5 of the second hilted broadsword is f2, the centre frequency of the first bandpass filter 6
Centre frequency for f1, the second bandpass filter 7 is f2, and Receiver Module 8 realizes the down coversion and amplification of harmonic signal, and
Two-way clock reference signal is generated to use for the first transmitting module 2 and the second transmitting module 3；10 passband of broadband filter includes f1
+ f2 and f1+2f2 frequency range.
As shown in Fig. 2, being provided with Magnetic Sensor 18 and the first absorbing material 16 on installation base plate 19, wave material is inhaled first
First transmitting antenna 12 and receiving antenna 14 are set on material 16, the second transmitting antenna 13 is set above the first transmitting antenna 12,
Second absorbing material 17 is set above Magnetic Sensor 18.First absorbing material 16 is for weakening external electromagnetic waves to the shadow of system
The fundamental signal for ringing and weakening transmitting is transmitted to exterior energy；Second absorbing material 17 passes magnetic for weakening electromagnetic wave
The influence of sensor 18；Magnetic Sensor 18 is for receiving measured target magnetic anomaly regular signal.
As shown in figure 3, Magnetic Sensor 18 and being made of the first transmitting antenna 12, the second transmitting antenna 13 and receiving antenna 14
Single group aerial array 20 be spacedly distributed on installation base plate 19.
The present invention also provides a kind of new violation electronic equipment detection methods, signal processing flow pair as shown in Figure 4
Target scattering signal is handled, and can effectively be realized target detection, be specifically comprised the following steps:
Step 1: FPGA signal processing and control panel 1 carry out AD quantization to magnetic anomaly regular signal harmony wave signal:
Entire detection zone is divided into 10 sub-regions by this system, is taken turns to operate by certain scanning sequency.System work
When making, the electromagnetic wave irradiation of metal knot or semiconductor junction by specific frequency (f1, f2), to scatter second harmonic signal
(f1+f2) enter radio-frequency head receiving channel with harmonic signal (f1+2f2), the received antenna 14 of harmonic signal, lead to receiving
From rf conversion to intermediate frequency 10.7MHz after completion frequency dividing, filtering and down-converted in road, by the FPGA signal processing in Fig. 1
And control panel 1 carries out AD and quantifies to become digital signal, wherein AD1 corresponds to second harmonic, and AD2 corresponds to triple-frequency harmonics, sampling
Rate is 125MHz.The magnetic anomaly regular signal as caused by metal is sensed by 18 magnetic in Fig. 3 analog signal reaching FPGA
AD3 in signal processing and control panel 1, sample rate 10KHz.The number of harmonic signal and magnetic anomaly regular signal is obtained in this step
Signal.
Step 2: FPGA signal processing and control panel 1 carry out pretreatment and spy to magnetic anomaly regular signal harmony wave signal respectively
Sign is extracted, and specific method is as follows:
First, harmonic wave digital signal enters numerical control plate.Filtering, down coversion and extraction processing are realized in numerical control plate, from
And data volume and throughput are reduced, FFT transform is then done, the spectrum information in certain bandwidth is obtained.Extract second harmonic and three
Subharmonic detects the energy of frequency range, retains spare.And bandpass filtering is carried out to magnetic anomaly regular signal.Due to magnetic anomaly regular signal frequency range compared with
It is low, bandpass filter is selected in the invention, and free transmission range is 4Hz~10Hz, with filter power supply interference and DC component.
Second, when detected material is not present, each Air conduct measurement thresholding T is determined using constant false alarm energy detector2,i、T3,i
(i=1,2 ..., 10 is channel number), T2,i、T3,iRespectively the i-th channel is secondary and triple-frequency harmonics detection threshold, which is consolidated
Change to FPGA program, for subsequent use.
The repeatedly magnetic anomaly regular signal containing metal that measurement human normal carries, such as without any metal, carrying skin
Band, carrying keys, carrying mobile phone and other items will receive data and store to form each channel magnetic anomaly sample of signal space Φc,i
(i=1,2 ..., 10 is channel number), calculates the maximum and minimum value in each channel sample space, to determine that the person carries gold
Belong to the magnetic anomaly range of article.By the way of constant false alarm, the detection threshold γ in each channel is obtainedc,i(i=1,2 ..., 10 are
Channel number), it is cured in FPGA program.
Step 3: carrying out target detection using dual mode data Fusion Features, the specific method is as follows:
If each channel court verdict is resulti.Calculate harmonic signal coefficient of kurtosis, coefficient of kurtosis PkiCalculation formula isWherein YjFor the amplitude of j-th of frequency point,For mean value, S is standard variance, and M is statistics frequency points.It counts respectively
Calculate second harmonic coefficient of kurtosis Pk2iWith triple-frequency harmonics coefficient of kurtosis Pk3i.Count each channel second harmonic and triple-frequency harmonics detection
Frequency range crosses the points N 2 of thresholdingiAnd N3i.Work as N2iOr N3iWhen greater than 0, by resulti1 is set, shows that there is suspected target (gold in the channel
Belong to knot, semiconductor junction), then compare second harmonic coefficient of kurtosis Pk2iWith triple-frequency harmonics coefficient of kurtosis Pk3i.If Pk2i>Pk3i,
At this moment testing result is directly given are as follows: the channel goes to the audible and visual alarm in Fig. 4 there are a large amount of semiconductor junctions；If Pk2i<
Pk3i, by resulti0 is set, shows metal knot more than semiconductor junction, at this moment needs to carry out auxiliary judgement using magnetic characteristic.When i-th logical
The magnetic anomaly regular signal s in roadi(t)>γc,iWhen, seek si(t) auto-correlation coefficient Ri, work as RiWhen < 0.5, resultiBe worth it is constant, at this moment
Directly give testing result are as follows: do not alarm there are doubtful key chain article in the channel；Work as Ri>=0.5, which may be by magnetism
Waistband influences, need to the magnetic anomaly regular signal to the symmetric channel in the channel make decisions, if the magnetic anomaly regular signal of symmetric channel
Auto-correlation coefficient R10-i>=0.5, then it represents that the i-th channel is magnetic waistband, at this moment provides the testing result result in the i-th channeli=
0, it does not alarm；R10-iWhen < 0.5, then it represents that the i-th channel is the more mobile phone or mobile hard disk etc. of tenor, the inspection in the i-th channel
Survey result resulti=1, go to the audible and visual alarm in Fig. 4.
The operation principle of the present invention is that:
1) overall design technique is detected using near field complex environment bimodulus (non-linear detection and magnetic detection).
The present invention devises a kind of violation electronic equipment detection door system of bimodulus system.Using the non-linear detection of dual-frequency point
And the technical system that passive magnetic Detection Techniques combine.Non-linear Detection Techniques can realize having for the poor electronic product of shielding
Effect detection, however higher miss probability will appear to the preferable electronic product of shielding, and can be because of the conventional gold such as key, belt
Belong to knot product and drawn wrong report, to make up this defect, combine passive magnetic Detection Techniques, is returned what two kinds of Detection Techniques obtained
Wave signal is organically combined to realize target detection.
2) using pasting absorbing material and optimizing the topology layout of Harmonic Detection antenna and Magnetic Sensor, to increase system
Isolation.
Since radio frequency active and passive device can all be generated harmonic effect by electromagnetic wave irradiation, wherein system parasitic harmonic wave is believed
Number on echo detecting influence it is more obvious, and aerial radiation go out electromagnetic field can detection system periphery generate a stronger magnetic
Field signal, and then signal is received on passive magnetic sensor and causes serious influence.Therefore, in the invention, using antenna and magnetic
Sensor separation lays, pastes the mode of absorbing material between two kinds of sensors, to weaken transmitting antenna electromagnetic wave signal pair
The influence of receiving channel.
3) to effectively increase electromagnetic wave overlay area, weaken influence of the channel harmonic wave interference to system, using it is a kind of it is high every
From degree wave beam coaxial antenna.
To realize effective irradiation of the double frequency electromagnetic wave signal to measured target, using a kind of wave beam coaxial antenna, so that two
The transmitting antenna main beam of a launching frequency is overlapped, and realizes effective irradiation of target.
4) magnetic induction and nonlinear echo signal for effectively combining measured target realize target sorting, and then reduce system
Misinformation probability.
Claims (4)
1. a kind of new violation electronic equipment detection method, characterized by the following steps:
Step 1: carrying out AD quantization to magnetic anomaly regular signal harmony wave signal；
Step 2: carrying out pretreatment and feature extraction to magnetic anomaly regular signal harmony wave signal；
Step 3: carrying out target detection using dual mode data Fusion Features:
(1) second harmonic and triple-frequency harmonics coefficient of kurtosis is calculated as follows:
Wherein YjFor the amplitude of j-th of frequency point,For mean value, S is standard variance, and M is statistics frequency point
Number；
(2) it counts each channel second harmonic and triple-frequency harmonics detection frequency range crosses the points N 2 of thresholdingiAnd N3i；
(3) work as N2iOr N3iWhen greater than 0, compare second harmonic coefficient of kurtosis Pk2iWith triple-frequency harmonics coefficient of kurtosis Pk3iIf:
Pk2i>Pk3i, then the testing result of " there are a large amount of semiconductor junctions in the channel " is provided, audible and visual alarm is then carried out；If Pk2i<
Pk3i, then enter (4) step；
(4) as the magnetic anomaly regular signal s in the i-th channeli(t) > channel magnetic anomaly signal detecting threshold γc,iWhen, seek si(t) from
Coefficient Ri, work as RiWhen < 0.5, the testing result of " there are doubtful key chain articles in the channel " is provided；Work as Ri>=0.5, then into
Enter (5) step；
(5) if the auto-correlation coefficient R of the magnetic anomaly regular signal of symmetric channel10-i>=0.5, then the court verdict for providing the i-th channel is
0；If R10-iWhen < 0.5, then the court verdict for providing the i-th channel is 1, then carries out audible and visual alarm.
2. the new violation electronic equipment detection method of one kind according to claim 1, it is characterised in that: right described in step 1
The method of magnetic anomaly regular signal harmony wave signal progress AD quantization are as follows: entire detection zone is divided into 10 sub-regions, by certain
Scanning sequency take turns to operate；When system works, the electromagnetic wave irradiation of metal knot or semiconductor junction by specific frequency, to dissipate
It projects second harmonic signal and harmonic signal, the received antenna of harmonic signal enters radio-frequency head receiving channel, it is logical receiving
Completed in road after frequency dividing, filtering and down-converted from rf conversion to intermediate frequency, then by FPGA signal processing and control panel into
Row AD quantization becomes digital signal；The magnetic anomaly regular signal as caused by metal is sensed by magnetic analog signal reaching FPGA letter
Number processing and control panel carry out AD quantization become digital signal.
3. the new violation electronic equipment detection method of one kind according to claim 1, it is characterised in that: right described in step 2
The method that magnetic anomaly regular signal harmony wave signal carries out pretreatment and feature extraction are as follows:
First, harmonic wave digital signal enters numerical control plate, and filtering, down coversion and extraction processing are realized in numerical control plate, is then done
FFT transform is extracted the energy of second harmonic and triple-frequency harmonics detection frequency range, is retained spare；Band logical filter is carried out to magnetic anomaly regular signal
Wave；
Second, when detected material is not present, the second harmonic in each channel and humorous three times is determined using constant false alarm energy detector
Wave detection threshold；The magnetic anomaly range that metal is carried according to determining human body, obtains each channel by the way of constant false alarm
Magnetic anomaly signal detecting threshold.
4. the new violation electronic equipment detection method of one kind according to claim 3, it is characterised in that: to magnetic anomaly regular signal
The bandpass filter free transmission range for carrying out bandpass filtering is 4Hz~10Hz.
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| CN108051775A (en) * | 2017-10-20 | 2018-05-18 | 上海微波技术研究所（中国电子科技集团公司第五十研究所） | The detection system and method for passing type electronic device |
| CN109726617A (en) * | 2017-10-30 | 2019-05-07 | 同方威视科技江苏有限公司 | Safe examination system and safety inspection method |
| CN111142166A (en) * | 2019-12-27 | 2020-05-12 | 上海微波技术研究所（中国电子科技集团公司第五十研究所） | Portable electronic device detection system |
| CN112327373A (en) * | 2020-09-22 | 2021-02-05 | 四川中物裕邦科技有限公司 | A safety inspection door for detecting |
| CN113498482A (en) * | 2020-10-15 | 2021-10-12 | 深圳市安卫普科技有限公司 | Scanning type nonlinear node detection method and device |
| CN113884761B (en) * | 2021-09-13 | 2023-04-25 | 中国电子科技集团公司第二十九研究所 | Method, device, equipment and medium for improving frequency measurement precision |
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| CN106772666A (en) | 2017-05-31 |
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