CN107404560A - A kind of wireless signal acquiring system for reducing mobile phone detection rate of false alarm - Google Patents
A kind of wireless signal acquiring system for reducing mobile phone detection rate of false alarm Download PDFInfo
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- CN107404560A CN107404560A CN201710703345.7A CN201710703345A CN107404560A CN 107404560 A CN107404560 A CN 107404560A CN 201710703345 A CN201710703345 A CN 201710703345A CN 107404560 A CN107404560 A CN 107404560A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/24—Arrangements for testing
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Abstract
The invention discloses a kind of wireless signal acquiring system for reducing mobile phone detection rate of false alarm, including MCU controllers, ADC converters, low-noise amplifier, bandpass filter, antenna-matching circuit and antenna；Pass through the antenna induction mobile phone radio frequency wireless signal, receive wireless signal by the antenna-matching circuit, amplify again via low-noise amplifier after being filtered by reception bandpass filter, signal after amplification is passed in MCU controllers after ADC converters carry out analog-to-digital conversion carries out FFT, check whether sensitive frequency has energy, determine whether that mobile phone passes through.The present invention significantly reduces mobile phone rate of false alarm, substantially reduces the workload of field maintenance person, significantly optimizes the Consumer's Experience of mobile phone detecting system.
Description
Technical field
The present invention relates to mobile phone detection field, more particularly to a kind of wireless signal acquiring for reducing mobile phone detection rate of false alarm
System.
Background technology
At present mobile phone detection mainstream technology have Coil technique, low-intensity magnetic field Detection Techniques, non-linear section Detection Techniques, using compared with
More is Coil technique and low-intensity magnetic field Detection Techniques.
The operation principle of ring coil detector is summarized：Designed according to electromagnetic field couples principle, when in loop coil
During by the electric current of certain frequency, if adding ferromagnetic material to coil section, the demagnetizing effect of coil vortex can be more than ferromagnetics
Increasing magnetic action and make it that the equivalent electric sensibility reciprocal of coil is obviously reduced, and mobile phone is by adding ferromagnetic material situation similar, examining
Test coil reaches testing goal according to this principle.Detection Techniques principle is the pure oscillation that crystal oscillator produces 3.5-4.95M, by dividing
Frequency device frequency dividing is 7.8K or so sine wave, and inputting the big coil of door-plate after triode and coil carry out power amplification carries out electromagnetic wave
Transmitting, is received respectively by each detecting area coil in door.After reception, the signal received and reference signal are compared
Compared with, after finding change, changing capture card output level, CPU is scanned in 300 milliseconds to each position capture card data,
Determine whether metal, electronic product, position and output display where judging.To improve detection sensitivity, toroidal coil sensors
Laying can be around shapes such as diamondwise, 8-shaped.All contain magnet in the sound pick-up outfits such as mobile phone, recording pen, examined using Magnetic Sensor
Changes of magnetic field is surveyed, the sound pick-up outfits such as mobile phone, recording pen can be detected.
Weak magnetic field testing technology carries out mobile phone detection by the mutation in detecting system magnetic field, and ferromagnetic material is by earth's magnetic field magnetic
After change, Magnetic Sensor can sense changes of magnetic field and magnetic variation is converted into electric signal when passing through array of magnetic sensors.
Magnetic Sensor can be changed with induced field, the magnetic field intensity that sensor collects mainly with sensor to magnetic source away from
From and direction have a relation, magnetic field intensity is as follows：
It can be seen that key index, which is Magnetic Sensor, needs high sensitivity and low noise bottom, as shown in Figure 1：
Non-linear node survey meter is the high frequency for sending S-band to target area or target object by the transmitting terminal of equipment
Fundamental wave (3.4-3.6GHz), second harmonic (7-7.5GHz) and triple-frequency harmonics as caused by receiving terminal capture from target object
(10-10.6GHz), harmonic signal is carried out with the fuzzy recognition algorithm in artificial intelligence field and self-learning algorithm analysis and
After processing, the front and rear harmonic wave changing rule of fundamental wave transmitting is provided, so as to effectively identify the electronics with non-linear knot
Equipment.
The shortcomings of non-linear node technology is costly because realizing that difficulty is big, and rate of false alarm is high, use is fewer, main flow
Equipment using coil detection and low-intensity magnetic field Detection Techniques, either coil detection or low-intensity magnetic field Detection Techniques have one it is fatal
Shortcoming is exactly that cannot be distinguished by the more article of the tenor such as mobile phone and wrist-watch, belt fastener, key, and rate of false alarm is higher, scene
Attendant can not judge that mobile phone alarm or wrist-watch, key, belt fastener etc. are alarmed, and using effect is excessively poor.
The content of the invention
The major defect of low-intensity magnetic field Detection Techniques：Rate of false alarm is higher；Easily influenceed by environmental magnetic field.Prior art passes through
Being mutated to detect the presence of mobile phone for detection magnetic field intensity, belongs to weak magnetic field testing technology, therefore the magnetic interference in environment can be right
Testing result impacts, and can cause the rise of rate of false alarm；The magnetic bodies such as wrist-watch, earphone, waistband can cause the prominent of magnetic field
Become, prior art can not accurately distinguish mobile phone and other magnetic bodies by the mutation of magnetic field intensity, so as to cause to report by mistake.
For above-mentioned technical problem, it is an object of the invention to provide a kind of method for reducing mobile phone detection rate of false alarm, sheet
Invention gathers array detection whether there is changes of magnetic field by Magnetic Sensor, judges nearby whether there is magnetic bodies, wireless acquisition system is adopted
Collection radiofrequency signal simultaneously carries out FFT, checks that sensitive frequency has noenergy after conversion, array of magnetic sensors collects mutation magnetic field
The sensitive frequency energy after wireless acquisition system FFT then carries out mobile phone alarm more than certain threshold value simultaneously, as long as two conditions have
One is unsatisfactory for, and does not alarm, and can so evade wrong report caused by key, wrist-watch, belt fastener etc..
To achieve the above object, the present invention is realized according to following technical scheme：
A kind of wireless signal acquiring system for reducing mobile phone detection rate of false alarm, it is characterised in that including MCU controllers, ADC
Converter, low-noise amplifier, bandpass filter, antenna-matching circuit and antenna；
By the antenna induction mobile phone radio frequency wireless signal, receive wireless signal by the antenna-matching circuit, lead to
Amplify again via low-noise amplifier after crossing reception bandpass filter filtering, the signal after amplification carries out mould by ADC converters
It is passed to after number conversion in MCU controllers and carries out FFT, check whether sensitive frequency has energy, determines whether that mobile phone passes through.
In above-mentioned technical proposal, the low-noise amplifier is adding shunt-resonant circuit on colelctor electrode, it is described simultaneously
Connection resonant tank includes inductance and electric capacity.
In above-mentioned technical proposal, in addition to array of magnetic sensors system, while the mobile phone radio frequency wireless signal that will be sensed
With array of magnetic sensors system acquisition to other determinands infrared signal simultaneously be sent to MCU controllers carry out Treatment Analysis,
Alarm is triggered if the sensitive frequency after there are anomalous variation while rf wireless signal FFT in magnetic field has energy, display detects
Mobile phone.
In above-mentioned technical proposal, the array of magnetic sensors system is made up of multiple independent low-intensity magnetic field acquisition systems, institute
Stating low-intensity magnetic field acquisition system is divided to both sides to arrange and electrically connected between two row's weak magnetic acquisition systems using communication cable.
The present invention compared with prior art, has the advantages that：
The present invention significantly reduces mobile phone rate of false alarm, substantially reduces the workload of field maintenance person, significantly optimizes mobile phone inspection
The Consumer's Experience of examining system.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the relation schematic diagram of sensor noise intensity and frequency in the prior art；
Fig. 2 is the wireless signal acquiring system schematic of the present invention；
Fig. 3 is the array of magnetic sensors system topology schematic diagram of the present invention.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, rather than whole embodiments.
The mainstream technology of mobile phone detection at present is Coil technique and low-intensity magnetic field Detection Techniques, low-intensity magnetic field Detection Techniques and coil skill
Art is as follows compared to advantage：High sensitivity/hypersensitivity detection can be realized to Weak magentic-field；Passive detection, it is radiationless, it is not right
Human body produces any injury, does not disturb ambient electronics；Low-power consumption, small volume；Temperature performance is stable, and high reliability is lossless
Detection.
The main technical schemes of low-intensity magnetic field Detection Techniques：Magnetic field of the earth can be similar to a dipole magnetic field, the dipole
Son is located at the earth's core, and the earth is wrapped in earth's magnetic field.The magnetic axis and the earth's axis of centered dipoles magnetic field are simultaneously misaligned, there is one between the two
The angle theta of very little, the angle are about 11.5 °.The both positive and negative polarity of dipole and the south poles contrast of the earth, according to international definition,
Magnetic north Nm is located near north geographic pole Ng, and magnetic south Sm is located near south geographical pole Sg.Magnetic field of the earth is in certain model
It is stable in enclosing, its geomagnetic field intensity is basically identical in several kilometer ranges, will not undergo mutation, only when magnet material
By or in the presence of, just can the magnetic field of the earth stable to script cause local dip, magnetic field intensity abrupt local.When mobile phone equimagnetic
Property object by or in the presence of, magnetic field of the earth is disturbed, causes the change of magnetic field intensity, from advanced Magnetic Sensor visit
The mutation in magnetic field is measured, that is, detects the presence of the magnetic bodies such as mobile phone.
Fig. 2 is that a kind of reduction mobile phone of the present invention detects the wireless signal acquiring system of rate of false alarm, it is characterised in that including
MCU controllers, ADC converters, low-noise amplifier, bandpass filter, antenna-matching circuit and antenna；
By the antenna induction mobile phone radio frequency wireless signal, receive wireless signal by the antenna-matching circuit, lead to
Amplify again via low-noise amplifier after crossing reception bandpass filter filtering, the signal after amplification carries out mould by ADC converters
It is passed to after number conversion in MCU controllers and carries out FFT, check whether sensitive frequency has energy, determines whether that mobile phone passes through.
Bandpass filter only allows the frequency in a certain frequency range by having very for the composition higher or lower than this frequency range
Big decay, is generally present in amplifier front-end.Such as only allow GSM：935-960MHZ or DCS:1805-1880MHZ's
Frequency range enters amplifier, obtains pure radiofrequency signal.Table 1, table 2, table 3 are respectively three big operator 2G, 3G, 4G mobile communication
Frequency range：
Table 1
| The ∽ 124 of GSM900 channels 1 | 890∽915MHz(25M)/935∽960MHz(25M) |
| The ∽ 885 of GSM1800 or DCS1800 channels 512 | 1710∽1785MHz(75M)/1805∽1880MHz(75M) |
| The ∽ 94 of 900 channel of China Mobile GSM 1 | 890∽909MHz(19M)/935∽954MHz(19M) |
| The ∽ 559 of 1800 channel of China Mobile GSM 512 | 1710∽1720MHz(10M)/1805∽1815MHz(10M) |
| The ∽ 124 of CHINAUNICOM's GSM900 channels 96 | 909∽915MHz(6M)/954∽960MHz(6M) |
| The ∽ 736 of CHINAUNICOM's GSM1800 channels 687 | 1745∽1755MHz(10M)/1840∽1850MHz(10M) |
| China Telecom CDMA | 825∽835MHz(10M)/870∽880MHz(10M) |
Table 2
| China Telecom CDMA2000 | 1920∽1935MHz(15M)/2110∽2125MHz(15M) |
| China Mobile TD-SCDMA | 1880∽1900MHz(20M)/2010∽2025MHz(15M) |
| CHINAUNICOM WCDMA | 1940∽1955MHz(15M)/2130∽2145MHz(15M) |
Table 3
Wherein low-noise amplifier is adding shunt-resonant circuit on colelctor electrode, and the shunt-resonant circuit is including electric
Sense and electric capacity.Low-noise amplifier is normally at ADC front ends, mainly carries out first order amplification to the high-frequency signal received,
To meet amplitude requirement of the ADC converters to input signal, the signal to noise ratio for receiving signal is improved；And required for selecting us
Frequency band, this is also frequency-selective network or resonant network.
Present invention additionally comprises array of magnetic sensors system, while the mobile phone radio frequency wireless signal and Magnetic Sensor that will be sensed
The infrared signal for other determinands that array system collects at the same be sent to MCU controllers carry out Treatment Analysis, if magnetic field has
Sensitive frequency of the anomalous variation simultaneously after rf wireless signal FFT has energy then to trigger alarm, shows and detects mobile phone.
The specific embodiment of the present invention：Human body triggers infrared signal when passing through whole system, system sends collection life
Order, array of magnetic sensors system acquisition surrounding magnetic field signal while wireless signal acquiring system acquisition radiofrequency signal, will be sensed
Mobile phone radio frequency wireless signal and array of magnetic sensors system acquisition to other determinands infrared signal simultaneously be sent to MCU control
Device processed carries out Treatment Analysis, is touched if the sensitive frequency after there are anomalous variation while rf wireless signal FFT in magnetic field has energy
Transmit messages police, and display detects mobile phone.
Array of magnetic sensors system is made up of multiple independent low-intensity magnetic field acquisition systems, and the low-intensity magnetic field acquisition system is divided to two
Side is arranged and electrically connected between two row's weak magnetic acquisition systems using communication cable, as shown in Figure 3.
The specific embodiment of the present invention is 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 a variety of changes or change within the scope of the claims, this not shadow
Ring the substantive content of the present invention.In the case where not conflicting, the feature in embodiments herein and embodiment can any phase
Mutually combination.
Claims (4)
1. a kind of wireless signal acquiring system for reducing mobile phone detection rate of false alarm, it is characterised in that turn including MCU controllers, ADC
Parallel operation, low-noise amplifier, bandpass filter, antenna-matching circuit and antenna；
By the antenna induction mobile phone radio frequency wireless signal, receive wireless signal by the antenna-matching circuit, by connecing
Amplify again via low-noise amplifier after receiving band-pass filter, the signal after amplification carries out modulus by ADC converters and turned
It is passed to after changing in MCU controllers and carries out FFT, check whether sensitive frequency has energy, determines whether that mobile phone passes through.
A kind of 2. wireless signal acquiring system for reducing mobile phone detection rate of false alarm according to claim 1, it is characterised in that
The low-noise amplifier includes inductance and electricity adding shunt-resonant circuit, the shunt-resonant circuit on colelctor electrode
Hold.
A kind of 3. wireless signal acquiring system for reducing mobile phone detection rate of false alarm according to claim 1, it is characterised in that
Also include array of magnetic sensors system, while the mobile phone radio frequency wireless signal sensed and array of magnetic sensors system acquisition are arrived
Other determinands infrared signal simultaneously be sent to MCU controllers carry out Treatment Analysis, if there is anomalous variation in magnetic field while penetrated
Sensitive frequency after frequency wireless signal FFT has energy then to trigger alarm, and display detects mobile phone.
A kind of 4. wireless signal acquiring system for reducing mobile phone detection rate of false alarm according to claim 3, it is characterised in that
The array of magnetic sensors system is made up of multiple independent low-intensity magnetic field acquisition systems, and the low-intensity magnetic field acquisition system point both sides are arranged
Arrange and electrically connected between two row's weak magnetic acquisition systems using communication cable.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110995297A (en) * | 2019-10-29 | 2020-04-10 | 芯创智（北京）微电子有限公司 | Low-power consumption receiver of silent surface wave filter |
| CN117834045A (en) * | 2024-03-05 | 2024-04-05 | 杰创智能科技股份有限公司 | Method, device, equipment and medium for measuring incoming wave direction of received signal |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110995297A (en) * | 2019-10-29 | 2020-04-10 | 芯创智（北京）微电子有限公司 | Low-power consumption receiver of silent surface wave filter |
| CN117834045A (en) * | 2024-03-05 | 2024-04-05 | 杰创智能科技股份有限公司 | Method, device, equipment and medium for measuring incoming wave direction of received signal |
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