CN108051775A - The detection system and method for passing type electronic device - Google Patents
The detection system and method for passing type electronic device Download PDFInfo
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- CN108051775A CN108051775A CN201710986356.0A CN201710986356A CN108051775A CN 108051775 A CN108051775 A CN 108051775A CN 201710986356 A CN201710986356 A CN 201710986356A CN 108051775 A CN108051775 A CN 108051775A
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- 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
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
- G01S5/0252—Radio frequency fingerprinting
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Abstract
The present invention provides a kind of detection systems and method of passing type electronic device, the system includes ultra-broadband signal source etc., harmonic reception passage, front end of emission circuit is all connected with ultra-broadband signal source, front end of emission circuit is connected with time division multiplexing mimo antenna array, time division multiplexing mimo antenna array is connected with receiving front-end circuit, receiving front-end circuit is connected with harmonic reception passage, harmonic reception passage is connected with data acquisition module, data acquisition module is connected with signal processing module, signal processing module is between data acquisition module and warning message output module, warning message output module is connected with time-sequence control module.The present invention can improve system detectivity height, and false alarm rate is low, and rate of false alarm is low, and easy disassembly is moved easily.
Description
Technical field
The present invention relates to a kind of detection system and method, a kind of detection system more particularly to passing type electronic device and
Method.
Background technology
The most basic element of electronic circuit is diode, and diode is coupled for two kinds of semiconductor substances, according to two poles
The tie-point of diode is generally referred to as nonlinear node by the characteristic of pipe.With the fast development of electronics industry, stolen various
Listen device, USB flash disk, mobile phone, video recorder, explosive timing means, on remote control largely using diode, triode and integrated electricity
Road, there is single or multiple nonlinear nodes in these electronic components.Harmonic wave re-radiation radar is exactly in the region of seeking
High frequency waves are inside sent, excite various timings, the self-excitation echo on the nonlinear node of the electronic equipments such as remote controler and tapping device is used
Receiver on detector captures various self-excitation echoes, to realize that electronic target detects.At present, skill is detected using non-linear knot
The electronic target detector of art has become one of main method of anti-terrorism anti-eavesdropping and secrecy safety check, at home and abroad extensively should
With.
It is existing by formula rays safety detection apparatus to whether being adopted with electronic product by the personnel of system, object, luggage etc.
With narrowband harmonic radar technology, electromagnetism interference performance is poor, radiant power is big, detectivity is relatively low and false alarm rate is higher, and adopts
Manual operation is needed with Handheld detection device, time-consuming and laborious costly, detection efficient is lower and equally exists false alarm rate height
The problem of.The present invention proposes a kind of using high-speed time-division multiplex multiple-input multiple-output (MIMO) aerial array and the spy of ultra wide band harmonic radar
The detection method of survey technology, using ultra wide band correlation reception and MIMO (Multiple-Input Multiple-Output, it is more
Input multiple output system) diversity technique improves detectivity, interference free performance, detectivity and detection efficient, and passes through and adopt
Principle false-alarm is reduced with the mode of ultra wide band harmonic radar detection Technology for Target Location and restriction search coverage, so as to
Realize the detection of passing type electronic product objective.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of detection system and method for passing type electronic device, energy
System detectivity height is enough improved, false alarm rate is low, and rate of false alarm is low, and easy disassembly is moved easily, and transmission power is small, to human body
It injures small, artificial detection is not required, detection speed is fast, efficient, saves substantial amounts of manpower and materials and time.
According to an aspect of the present invention, a kind of detection system of passing type electronic device is provided, which is characterized in that including
Ultra-broadband signal source, harmonic reception passage, front end of emission circuit, receiving front-end circuit, data acquisition module, signal processing mould
Block, warning message output module, time-sequence control module, time division multiplexing mimo antenna array, harmonic reception passage, front end of emission electricity
Lu Douyu ultra-broadband signals source is connected, and front end of emission circuit is connected with time division multiplexing mimo antenna array, is time-multiplexed MIMO days
Linear array is connected with receiving front-end circuit, and receiving front-end circuit is connected with harmonic reception passage, and harmonic reception passage is adopted with data
Collection module is connected, and data acquisition module is connected with signal processing module, and signal processing module is located at data acquisition module and alarm
Between message output module, warning message output module is connected with time-sequence control module.
Preferably, the ultra-broadband signal source include the first signal source, secondary signal source, first harmonic frequency mixer, first
Signal source, secondary signal source are all connected with first harmonic frequency mixer, and the first signal source is located at the top in secondary signal source；Described
One signal source is fixed frequency signal, and secondary signal source is ultra wide band stepping swept-frequency signal, this two paths of signals passes through front end of emission
Circuit and transmitting antenna are launched, while form receiving terminal intermediate frequency local oscillator signal by first harmonic frequency mixer, by target
Re-radiation composite wave signal after excitation is after ultra-wideband antenna reception and the processing of receiving front-end radio circuit, with local oscillator
Signal is mixed, and using harmonic wave received IF signal is formed after harmonic wave intermediate-frequency filter, amplifier amplification, is time-multiplexed
It switches at high speed by a special time-sequence control module to be uniformly controlled between the dual-mode antenna pair of mimo antenna array.
Preferably, the harmonic reception passage includes harmonic wave received IF signal, harmonic wave intermediate-frequency filter, amplifier, the
Two harmonic mixers, harmonic wave received IF signal are connected with harmonic wave intermediate-frequency filter, and harmonic wave intermediate-frequency filter is connected with amplifier,
Amplifier is connected with second harmonic frequency mixer.
Preferably, the data acquisition module timesharing is completed, to acquisition of each dual-mode antenna to intermediate-freuqncy signal, to gather number
It is handled according to sending to signal processing module.
Preferably, the signal processing module mainly completes to receive the demodulation of signal, multichannel transceiver channel demodulated signal
Selection type diversity, echo signal limited apart from domain search and module space exploration and the judgement of electronic target alarm signal and
Information generates, and ultimately produces effective warning message and exports and reliably alarmed；Harmonic reception passage is mainly used to receive target
Multiple harmonic reception passages may be employed to improve detection efficiency in re-radiation harmonic echoes signal；Warning message output module master
To be used for generating target detection coding information and carry out indicative alarm；Time-sequence control module is mainly used to control mimo antenna
Timesharing switching between transmitting-receiving, eliminates the mutual interference formed when multiple antennas works at the same time；The MIMO aerial arrays that are time-multiplexed are mainly real
Existing space diversity and target positioning.
Preferably, described two time division multiplexing mimo antenna arrays are arranged in the two of passing type electronic device detector gate
Side.
The present invention also provides a kind of detection methods of passing type electronic device, which is characterized in that comprises the following steps：
Step 1, time division multiplexing mimo antenna array all gather data by data acquisition module；
Step 2, inversefouriertransform：Anti- Fourier is carried out to corresponding gathered data to each dual-mode antenna respectively
Conversion, obtains corresponding one-dimensional range profile data；
Step 3, Range Profile data compare, two pairs of larger data of selection target characteristic alternatively property diversity encumbrance
According to；
Step 4, constant false alarm processing and target detection；Constant false alarm processing and target inspection are carried out at the same time to diversity retention data
It surveys；
Step 5, distance threshold set the goal judgement；Object detection results according to obtaining set the goal according to distance threshold to be sentenced
Not；
Step 6, warning message production and output；Corresponding warning message is generated according to court verdict and passes through alarm signal
Cease output module output.
Compared with prior art, the present invention has following advantageous effect：The present invention can use passing type electronic device
Detection system and method the device electronics that various needs can be used for prevent from eavesdropping, shoot with video-corder, copy, explode etc. there is PN to tie
Equipment (such as various tapping devices, USB flash disk, mobile phone, video recorder, explosive timing means, remote control largely use diode,
The electronic equipment of triode and integrated circuit) the anti-safety check safety guarantee of stealing secret information of anti-terrorism in place that is carried into.The present invention visits
Survey high sensitivity, false alarm rate is low, rate of false alarm is low, easy disassembly, be moved easily, transmission power it is small, it is small to human injury.It need not
Artificial detection, detection speed is fast, efficient, saves substantial amounts of manpower and materials and time.
Description of the drawings
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon：
Fig. 1 is the functional block diagram of the detection system of passing type electronic device of the present invention.
Fig. 2 is the structure diagram of present invention time division multiplexing mimo antenna array.
Fig. 3 is receiving end signal process flow block diagram provided in an embodiment of the present invention.
Specific embodiment
With reference to specific embodiment, the present invention is described in detail.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill to this field
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection domain.
Present pre-ferred embodiments are provided below in conjunction with the accompanying drawings, with the technical solution that the present invention will be described in detail.
As shown in Figure 1, the detection system of passing type electronic device of the present invention includes ultra-broadband signal source, harmonic reception leads to
Road, front end of emission circuit, receiving front-end circuit, data acquisition module, signal processing module, warning message output module, sequential
Control module, time division multiplexing mimo antenna array, harmonic reception passage, front end of emission circuit are all connected with ultra-broadband signal source,
Front end of emission circuit is connected with time division multiplexing mimo antenna array, and be time-multiplexed mimo antenna array and receiving front-end circuit phase
Even, receiving front-end circuit is connected with harmonic reception passage, and harmonic reception passage is connected with data acquisition module, data acquisition module
It is connected with signal processing module, signal processing module is between data acquisition module and warning message output module, alarm signal
Breath output module is connected with time-sequence control module.
The ultra-broadband signal source includes the first signal source, secondary signal source, first harmonic frequency mixer A1, the first signal
Source, secondary signal source are all connected with first harmonic frequency mixer A1, and the first signal source is located at the top in secondary signal source；Described first
Signal source is fixed frequency signal, and secondary signal source is ultra wide band stepping swept-frequency signal, this two paths of signals passes through front end of emission electricity
Road and transmitting antenna are launched, while form receiving terminal intermediate frequency local oscillator signal by first harmonic frequency mixer A1, by target
Re-radiation composite wave signal after excitation is after ultra-wideband antenna reception and the processing of receiving front-end radio circuit, with local oscillator
Signal is mixed, and using harmonic wave received IF signal is formed after harmonic wave intermediate-frequency filter, amplifier amplification, is time-multiplexed
It switches at high speed by a special time-sequence control module to be uniformly controlled between the dual-mode antenna pair of mimo antenna array.
The harmonic reception passage, which includes harmonic wave received IF signal, harmonic wave intermediate-frequency filter, amplifier, second harmonic, to be mixed
Frequency device A2, harmonic wave received IF signal are connected with harmonic wave intermediate-frequency filter, and harmonic wave intermediate-frequency filter is connected with amplifier, amplifier
It is connected with second harmonic frequency mixer A2.
The data acquisition module timesharing is completed to acquisition of each dual-mode antenna to intermediate-freuqncy signal, and gathered data is sent to letter
Number processing module is handled.
The signal processing module is mainly completed to receive the demodulation of signal, the selection type point of multichannel transceiver channel demodulated signal
Collection, echo signal limited apart from domain search and module space exploration and the judgement of electronic target alarm signal and information generation
Etc. functions, ultimately produce effective warning message and export and reliably alarmed；Harmonic reception passage is mainly used to receive target again
Harmonic echoes signal is radiated, multiple harmonic reception passages may be employed to improve detection efficiency；Warning message output module is main
For generating target detection coding information and carrying out indicative alarm；Time-sequence control module is mainly used to that mimo antenna is controlled to receive
Timesharing switching between hair, eliminates the mutual interference formed when multiple antennas works at the same time；Time division multiplexing MIMO aerial arrays are mainly realized
Space diversity and target positioning.
As shown in Fig. 2, two time division multiplexing mimo antenna arrays that the present invention uses are arranged in passing type electronic dress
The both sides of detector gate are put, left-hand door and You Men are respectively equipped with M transmitting antenna and M reception antenna unit, transmitting and reception day
The mode that line may be employed up and down staggeredly is distributed, and the transmitting-receiving order of work of left and right door is uniformly adjusted by special time-sequence control module
Degree control may be employed the target reflection detection mode that left-hand door transmitting left-hand door receives, left-hand door can also be used to emit right door and received
The target direct irradiation detection mode received with right door transmitting left-hand door.M is natural number.
The detection method of passing type electronic device of the present invention comprises the following steps：
Step 1, time division multiplexing mimo antenna array all gather data by data acquisition module；
Step 2, inversefouriertransform：Anti- Fourier is carried out to corresponding gathered data to each dual-mode antenna respectively
Conversion, obtains corresponding one-dimensional range profile data；
Step 3, Range Profile data compare, two pairs of larger data of selection target characteristic alternatively property diversity encumbrance
According to, the target property can be energy response or special with certain classification target matching similarity in the object library that prestores
Property；
Step 4, constant false alarm processing and target detection；Constant false alarm processing and target inspection are carried out at the same time to diversity retention data
It surveys；
Step 5, distance threshold set the goal judgement；Limited according to obtained object detection results according to range gate (such as 1
Rice radius region) target-recognition, the false-alarm that the jamming target beyond limited area is formed can be excluded；
Step 6, warning message production and output；Corresponding warning message is generated according to court verdict and passes through alarm signal
Cease output module output.
For ultra wide band stepping frequency sweep composite wave emits signal, transmitting signal can be expressed as formula (1) institute
Show,
St=A cos [2 π f (t) t] s (t)+A1 cos[2π·f0t]s(t)......(1)
In formula, A be transmitting signal amplitude, s (t) be standard block signal, f0For fixed Combination wave frequency rate, f (t) is step
Into frequency, can be expressed as shown in formula (2),
F (t)=fstart+ (i-1) Δ f, (i-1) Δ t≤t≤i Δs t, i=1,2, Λ, N...... (2)
In formula, N be step frequency number, Δ f be step frequency interval, Δ t be the single frequency duration, fstartTo rise
Beginning frequency.
If search coverage is there are electronic target, after filtered, target echo combination frequency signal is such as following formula (3)
It is shown,
Received IF signal such as following formula can be obtained by receiving mixing and filtering afterwards（4）It is shown,
R is target range in formula, and C is the light velocity, by SR1Target can be obtained by collecting and carrying out inverse Fourier transform
One-dimensional range profile, the one-dimensional range profile data being respectively compared between each transmitting reception antenna pair and make choice type diversity
Processing, two groups of data of domain target maximum of adjusting the distance are defined constant false alarm threshold judgement in distance domain, generate and export alarm
Information.
In order to improve detectivity and detection target location accuracy, the present invention uses ultra wide band stepping swept-frequency signal conduct
Emit signal, the signal systems such as ultra-wideband linear frequency modulation, non-equilibrium biphase coding, orthogonal frequency division multiplex OFDM can also be used,
Receiving end signal processing mode corresponding to the transmitting signal of different systems is different, if bandwidth is identical, these signal systems can
It is also equal with the signal processing gain of acquisition, in order to improve the linearity of transmitting and receiving terminal and improve detectivity, this hair
It is bright to use composite wave transmitting, composite wave medium frequency reception processing mode, improve detectivity and detection target location accuracy.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring the substantive content of the present invention.
Claims (7)
1. a kind of detection system of passing type electronic device, which is characterized in that including ultra-broadband signal source, harmonic reception passage,
Front end of emission circuit, receiving front-end circuit, data acquisition module, signal processing module, warning message output module, timing control
Module, time division multiplexing mimo antenna array, harmonic reception passage, front end of emission circuit are all connected with ultra-broadband signal source, emit
Front-end circuit is connected with time division multiplexing mimo antenna array, and time division multiplexing mimo antenna array is connected with receiving front-end circuit, connects
It receives front-end circuit with harmonic reception passage to be connected, harmonic reception passage is connected with data acquisition module, data acquisition module and letter
Number processing module is connected, and for signal processing module between data acquisition module and warning message output module, warning message is defeated
Go out module with time-sequence control module to be connected.
2. the detection system of passing type electronic device according to claim 1, which is characterized in that the ultra-broadband signal source
Including the first signal source, secondary signal source, first harmonic frequency mixer, the first signal source, secondary signal source are all mixed with first harmonic
Frequency device is connected, and the first signal source is located at the top in secondary signal source；First signal source be fixed frequency signal, secondary signal
Source is ultra wide band stepping swept-frequency signal, this two paths of signals is launched by front end of emission circuit and transmitting antenna, passed through simultaneously
First harmonic frequency mixer forms receiving terminal intermediate frequency local oscillator signal, and the re-radiation composite wave signal after target excitation is by super
Broad-band antenna is received with after the processing of receiving front-end radio circuit, is mixed with local oscillation signal, using harmonic wave intermediate frequency filtering
Harmonic wave received IF signal is formed after device, amplifier amplification, the height between the dual-mode antenna pair of mimo antenna array that is time-multiplexed
Speed switching is uniformly controlled by a special time-sequence control module.
3. the detection system of passing type electronic device according to claim 1, which is characterized in that the harmonic reception passage
Including harmonic wave received IF signal, harmonic wave intermediate-frequency filter, amplifier, second harmonic frequency mixer, harmonic wave received IF signal with
Harmonic wave intermediate-frequency filter is connected, and harmonic wave intermediate-frequency filter is connected with amplifier, and amplifier is connected with second harmonic frequency mixer.
4. the detection system of passing type electronic device according to claim 1, which is characterized in that the data acquisition module
Timesharing is completed to acquisition of each dual-mode antenna to intermediate-freuqncy signal, and gathered data is sent to signal processing module and handled.
5. the detection system of passing type electronic device according to claim 1, which is characterized in that the signal processing module
It is main complete to receive the demodulation of signal, the selection type diversity of multichannel transceiver channel demodulated signal, echo signal apart from domain search
With the restriction of module space exploration and the judgement of electronic target alarm signal and information generation, it is defeated to ultimately produce effective warning message
Go out and reliably alarmed；Harmonic reception passage is mainly used to receive target re-radiation harmonic echoes signal, may be employed multiple
Harmonic reception passage improves detection efficiency；Warning message output module is mainly used to generate target detection coding information and carry out
Indicative alarm；Time-sequence control module is mainly used to control the timesharing switching between mimo antenna transmitting-receiving, eliminates multiple antennas simultaneously
The mutual interference formed during work；Time division multiplexing mimo antenna array mainly realizes space diversity and target positioning.
6. the detection system of passing type electronic device according to claim 1, which is characterized in that described two time division multiplexings
Mimo antenna array is arranged in the both sides of passing type electronic device detector gate.
7. a kind of detection method of passing type electronic device, which is characterized in that comprise the following steps：
Step 1, time division multiplexing mimo antenna array all gather data by data acquisition module；
Step 2, inversefouriertransform：Inversefouriertransform is carried out to corresponding gathered data to each dual-mode antenna respectively,
Obtain corresponding one-dimensional range profile data；
Step 3, Range Profile data compare, two pairs of larger data of selection target characteristic alternatively property diversity retention data；
Step 4, constant false alarm processing and target detection；Constant false alarm processing and target detection are carried out at the same time to diversity retention data；
Step 5, distance threshold set the goal judgement；It is set the goal differentiation according to distance threshold according to obtained object detection results；
Step 6, warning message production and output；Corresponding warning message is generated according to court verdict and to pass through warning message defeated
Go out module output.
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Cited By (5)
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| CN110058219A (en) * | 2018-12-30 | 2019-07-26 | 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） | MIMO harmonic radar |
| CN110146748A (en) * | 2018-07-11 | 2019-08-20 | 南京洛普科技有限公司 | A kind of automobile mounted radar antenna complete machine planar near-field test device |
| 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 |
| CN114520670A (en) * | 2020-11-18 | 2022-05-20 | Oppo广东移动通信有限公司 | Ultra-wideband communication system and electronic equipment |
| CN115412104A (en) * | 2021-05-28 | 2022-11-29 | 北京小米移动软件有限公司 | Gesture recognition method and device, mobile terminal and computer readable storage medium |
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| CN115412104A (en) * | 2021-05-28 | 2022-11-29 | 北京小米移动软件有限公司 | Gesture recognition method and device, mobile terminal and computer readable storage medium |
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