CN108627876A - Cheat at one's exam the Distributed Detection localization method and detection device of wireless invisible earpiece - Google Patents

Cheat at one's exam the Distributed Detection localization method and detection device of wireless invisible earpiece Download PDF

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Publication number
CN108627876A
CN108627876A CN201810774390.6A CN201810774390A CN108627876A CN 108627876 A CN108627876 A CN 108627876A CN 201810774390 A CN201810774390 A CN 201810774390A CN 108627876 A CN108627876 A CN 108627876A
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magnetic field
audio frequency
field signal
frequency magnetic
examinee
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CN201810774390.6A
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张伟
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张伟
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/12Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with electromagnetic waves

Abstract

Cheat at one's exam the Distributed Detection localization method and detection device of wireless invisible earpiece.It was that invigilator personnel need to go to the examinee for transmitting signal by chance at one's side and could find that examinee practises fraud in the past.The method of the present invention includes one group of audio frequency magnetic field signal minitype detecting device, according to the seat distribution mode of examination hall examinee, an audio frequency magnetic field signal detecting device is arranged in the position of each examinee, the light-emitting surface that the position of arrangement meets audio frequency magnetic field signal detecting device can be observed by invigilator personnel, the distribution of all audio frequency magnetic field signal detecting devices forms a detection array, when the audio frequency magnetic field signal for occurring artificially generating, the alarm lamp of audio frequency magnetic field signal detecting device in the audio frequency magnetic field signal driving detection array shines, the highest alarm lamp of brightness is nearest apart from audio frequency magnetic field signal source, it is believed that the examinee of the alarm lamp position of the maximum brightness carries the audio frequency magnetic field signal source artificially generated.The present invention is applied to the anti-device of practising fraud in examination hall.

Description

Cheat at one's exam the Distributed Detection localization method and detection device of wireless invisible earpiece
Technical field:
The present invention relates to a kind of Distributed Detection localization method of wireless invisible earpiece that cheats at one's exam and detection devices, particularly, Detection device is the detector of microminiature.
Background technology:
The high-tech equipment that cheats at one's exam mainly is divided to two kinds, i.e. the cheating equipment by seeing and the cheating equipment by listening:
1, by the cheating equipment seen, exactly display screen be hidden into it is various can bring into the article in examination hall, such as:With display function Pen, lattice ruler, calculator, wrist-watch, mess card, rubber etc., although these cheating equipment disguise oneself as different shapes, but use eyes after all It goes to see answer, this vigilance seen the movement of answer and easily cause invigilator personnel of examinee, receiving high-tech, anti-business training is examined in cheating The invigilator personnel of instruction can quickly screen the cheating equipment used in examinee and prevent its cheating, just because of being set by the cheating seen It is standby to be easy to be found and discovered and seized by invigilator personnel, so this equipment application is not extensive.
, cheating equipment by listening, be exactly that examinee utilizes the wireless invisible earpiece being put into duct(Related invention: CN201320319586.9, a kind of duct concealed earphone)Cheating information is received, invigilator personnel are difficult to find by observation examinee's movement The cheating of examinee, therefore concealed earphone has become the equipment that cheats at one's exam generally used in the event that cheats at one's exam in recent years, Seriously endanger examination security.
Wireless invisible earpiece mainly has two kinds of passive and active type:Passive concealed earphone is usually by that can be put into duct The interior magnetic magnet of height is constituted, by resonance that magnet generates under audio-electromagnetically field action and sounding;Active concealed earphone is general It is the micromodule equipment for being placed in duct being made of miniature coils, signal amplification circuit, loudspeaker and battery, by coil in audio-frequency electric The induced current generated in magnetic field, then sound horn is driven by amplifying circuit.Above two wireless invisible earpiece need to with Information receives, the receiver of audio-frequency electric magnetic wave emission function is used in conjunction with, and examinee receives by receiver outside examination hall in examination process The transmitting of cheating clique answer information, then answer information is radiated in the form of audio electromagnetic field to wireless hidden by receiver Shape earphone is listened to for examinee to cheat at one's exam to realize.
The wireless invisible earpiece signal receiver external form occurred in recent years is various, and volume is smaller and smaller, frequency reception signal Non- citizens' radio band is even occupied, while the audio electromagnetic field emitted radiates also very little, and is used for hidden control switch Cut-out transmitting signal, such as mercoid switch, miniature key switch, these designs can effectively antagonize current examination hall technical precaution personnel and use Audio electromagnetic field detecting devices(Related invention:CN200620146804.3 cheats at one's exam with wireless invisible earpiece detector) Detection, therefore practise fraud that clique is referred to as counter to examinee shields anti-detection wireless concealed earphone, can will not be by invigilator's personnel's hair It is existing, it misleads examinee's trial of making a desperate move and cheats at one's exam.
At present mode is mainly the following for the anti-means of concealed earphone exam cheating operations:
The mode of invigilator personnel range estimation.Range estimation is that requirement examines business personnel during invigilator or tour, passes through naked eye examinee's ear Whether apparent foreign matter is had in piece.Since the volume of concealed earphone is smaller and smaller, visual method is difficult different in discovery examinee's duct Object, in addition visual method and examine the working attitude of business personnel, light intensity, the dressing of examinee or hair decorations etc. have relationship in field, Arbitrariness is also big for the lookup mode of this concealed earphone, and implementation effect is extremely limited.
Using metal detector is contactless search the person by the way of.Article of the metal detector when examinee enters examination hall before setting the exam It is widely used in inspection, but concealed earphone signal receiver can blind inspection personnel by the belt buckle that disguises oneself as, hair fastener, glasses etc. It checks and brings examination hall into, since metal detector sensitivity is limited, it is difficult to the concealed earphone in examinee's duct be detected, so not It can prevent concealed earphone and examination hall implementation cheating is brought by examinee.
Link towards concealed earphone receiver communication with the outside world, by searching for or interference communication frequency with reach counter make The mode of disadvantage.
Mobile communication signal shielding device.This equipment is usually disposed in examination hall, by improving making an uproar for mobile communication frequency range Vocal level, prevent mobile phone from base station normal communication, be limited in that only for using mobile phone as the work of information receiving device Disadvantage equipment is effective.
Radiocommunication signals shield device.This equipment is usually disposed near examination hall, powerful with frequency by emitting Signal interferes the reception signal of concealed earphone signal receiver, but as the frequency point of cheating signal is different, also relates to sometimes Control frequency range, therefore it can be restricted in terms of working frequency range and channel capacity.
Profession detection vehicle and portable direction-finding equipment.This equipment is usually disposed outside examination hall, by monitoring car and portable Formula direction-finding equipment to examination hall outside emission source searched and positioned, due to practise fraud signals disperse, the test time section in can only A small number of signals are searched, and expensive.
Towards the communication links between concealed earphone receiver and earphone, by searching for or interference tones electromagnetic field to reach anti- Make the mode of disadvantage.
Audio electro-magnetic signal detector.This equipment, which can monitor the audio electro-magnetic signal in examination hall, can also restore sound It is monitored for invigilator personnel, and cheating examinee position is determined according to the Strength Changes of audio electromagnetic field, but counter shield anti-detection wireless Control of the concealed earphone with hidden switchs, and when the switch is closed, audio electro-magnetic signal disappears, and invigilator personnel use audio-frequency electric Magnetic signal detector can not detect cheating signal again, cause to be difficult to even if detecting in examination hall of having concealed earphone cheating Determine the examinee for carrying concealed earphone cheating.
Concealed earphone is interfered using wire laying mode transmitting audio electromagnetic field interference signal.This equipment is usually deployed In examination hall, concealed earphone can be effectively interfered, but since the general quantity in examination hall is more, necessarily lead to using wire laying mode complicated Workload is implemented relatively difficult.
Positioning device is interfered using Portable concealed earphone.This equipment utilization mancarried device is sent out with sufficiently large power The audio-frequency electric magnetic wave of particular frequency range is penetrated as interference positioning signal driving concealed earphone work, can effectively interfere positioning hidden Shape earphone solves the problems, such as wiring type audio electromagnetic field jamming equipment inconvenience deployment, but high-power audio electromagnetic field emissions are set It receives the factors such as transmitting coil diameter, power supply and volume is big, of high cost, is not suitable as the technical precaution that invigilator personnel allot in examination hall Equipment large-scale use.
In conclusion traditional interference or lookup means has some limitations, so there is an urgent need to develop a kind of new The cost for wireless invisible earpiece it is very cheap, operation is simple, identification is accurate, is examined suitable for large-scale use in examination hall Field technical precaution device effectively takes precautions against illegal use of the wireless invisible earpiece in examination.
Invention content:
In order to overcome the above problem of the existing technology, cheat at one's exam wireless invisible earpiece the object of the present invention is to provide one kind Distributed Detection localization method and detection device.
Above-mentioned purpose is realized by following technical scheme:
A kind of Distributed Detection localization method for the wireless invisible earpiece that cheats at one's exam, composition include:Prepare one group of audio frequency magnetic field Signal minitype detecting device, a) described in audio frequency magnetic field signal minitype detecting device have alarm lamp, the alarm lamp The increase for the audio frequency magnetic field signal strength that brightness is received with audio frequency magnetic field signal minitype detecting device and brighten, with audio frequency magnetic field The reduction of signal strength and it is dimmed;
B) according to the seat distribution mode of examination hall examinee, arrange that an audio frequency magnetic field signal is micro- in the position of each examinee Type detection device, the light-emitting surface that the position arranged meets audio frequency magnetic field signal minitype detecting device can be by invigilator personal observations It arrives, the distribution of all audio frequency magnetic field signal minitype detecting devices forms a detection array;
C) when the audio frequency magnetic field signal for occurring artificially generating, the audio magnetic in the audio frequency magnetic field signal driving detection array The alarm lamp of field signal minitype detecting device shines;
D) since the intensity of audio frequency magnetic field signal decays rapidly in air, cause to be located at audio frequency magnetic field signal source different distance Alarm lamp light emission luminance it is different, the highest alarm lamp of brightness is nearest apart from audio frequency magnetic field signal source, and judgement thinks that this is most highlighted The examinee of the alarm lamp position of degree carries the audio frequency magnetic field signal source artificially generated, that is, the wireless stealth to cheat at one's exam Ear speaker device.
The Distributed Detection localization method of the wireless invisible earpiece that cheats at one's exam, the audio frequency magnetic field signal are miniature Detection device wears band with examinee, or is arranged on the desktop used in examinee, and the alarm lamp uses LED light.
A kind of audio frequency magnetic field signal minitype detecting device for the wireless invisible earpiece that cheats at one's exam that the above method uses, group At including:Audio frequency magnetic field signal receiving antenna, the audio frequency magnetic field signal receiving antenna are connect with power amplifier circuit, institute The power amplifier circuit stated is connect with low-pass filter circuit, and the low-pass filter circuit is connect with alarm lamp, with button electricity Power supply of the pond as each electrical appliance.
The audio frequency magnetic field signal minitype detecting device of the wireless invisible earpiece that cheats at one's exam, low-pass filtering electricity The signal frequency range of road output is the audiorange of 20-20000Hz, and the alarm lamp uses LED light.
Beneficial effects of the present invention:
Since wireless invisible earpiece must use audio frequency magnetic field signal, and audio frequency magnetic field signal is decayed seriously in air, usually Effective distance is no more than 1 meter, and in the environment of examination hall, non-artificial audio frequency magnetic field signal is not present, only cheating is wireless Concealed earphone equipment will produce audio frequency magnetic field signal.The present invention utilizes These characteristics, and it is wireless to have devised Distributed Detection positioning The method of concealed earphone equipment is distributed using the minitype detecting device for being more suitable for detection audio magnetic field signal according to examinee seat To arrange detection device, formation array.Point in array is both detection device, the position place of examinee and the nothing of cheating The position that line concealed earphone equipment is likely to occur, therefore when there is artificial audio frequency magnetic field signal, be necessarily from cheating and use Equipment, the location point being also necessarily from where examinee, if in array only there are one detection device it is shinny, unquestionably It is exactly the source of audio frequency magnetic field signal source, if there are multiple detection devices shinny in array, is bound to most bright there are one Detection device, which is exactly the source of audio frequency magnetic field signal source.Specifically, more complicated situation, can be according to detection device The characteristics of feature and Distributed localization method, is judged, may be implemented to carry out each examinee lasting audio frequency magnetic field in a word Signal detection, if in examination process using cheating wireless invisible earpiece equipment, can find immediately and it is shinny warn, to The case where thoroughly preventing using wireless invisible earpiece equipment and cannot being found.
The audio frequency magnetic field signal minitype detecting device of the wireless invisible earpiece that cheats at one's exam of the present invention is a kind of microminiature dress It sets, audio frequency magnetic field signal receiving antenna, power amplifier circuit, the structure of low-pass filter circuit and power all very littles, to make Obtain the volume and cost all very littles of whole device.The packaging of this detection device can make various forms, for example make Coin-size, or do slabbing and bury in seat number label, since appearance is small and exquisite, plasticity is strong, can incorporate and examine well In the environment of field, examinee will not be impacted.
Since the transmitter of wireless invisible earpiece is intended to transmitting audio-frequency electric magnetostatic wave signal, and audio-frequency electric magnetostatic wave signal belongs to low Frequency electromagnetic waves, aerial relaxation phenomenon is very serious, is substantially not present non-artificial audio-frequency electric magnetic wave in a natural environment Signal less exists in the environment of examination hall, therefore must be just artificially to generate when detecting audio-frequency electric magnetostatic wave signal in examination hall 's.Due to audio-frequency electric magnetic wave signal intensity attenuation, the transmitting coil of wireless invisible earpiece transmitter must exist apart from concealed earphone In the range of within 30 centimetres, clearly signal output can be just provided for earphone.And the detection device of the present invention only needs to visit Acoustic frequency electromagnetic waves signal whether there is, thus within 1 meter of the transmitting coil from transmitter with a distance from can accurately capture Its audio-frequency electric magnetostatic wave signal emitted, and luminous alarm, the brightness change of LED can also reflect range transmission coil distance Variation.The desktop in examinee is arranged in apparatus of the present invention, or is worn on examinee, one meter of examinee's ear is thus in In range, if examinee carries the transmitter of wireless invisible earpiece, then when it is practised fraud using transmitter, generation Audio-frequency electric magnetostatic wave signal will be captured by the detector of examinee at one's side, and luminous prompting invigilates personnel.And farther out from this examinee Another detector would not shine, or will appear the different phenomenon of brightness luminous, to realize audio-electromagnetically The precise positioning of signal generating source.
Since detection device cost of the present invention is very low, each examinee may be implemented and configure one, lasting monitoring solves The limitation of traditional anti-cheating device detection also saves anti-cheating equipment cost, the total anti-cheating cost energy in each examination hall It declines to a great extent.Whether examination hall supervisor shines only by the observation present apparatus it may determine that whether examinee is using wireless stealthy The transmitter of earphone.Simultaneously by video monitoring, can also be easy to carry out observation judgement to whether the present apparatus shines.
The detection method of the present invention is as described below:
1)The present apparatus is placed on away from examinee's 0-100 cm distances(It is wearable with examinee, may also placed in examinee's desktop On)
2)When the concealed earphone equipment that examinee carries emits audio-electromagnetically field signal, the present apparatus can receive the electromagnetic field signal And the brightness that alarm lamp is arranged according to Electromagnetic Signal Strength sends out light warning signal,
3)When invigilator personnel have found light warning signal, sent out according to the present apparatus being placed on by cheating examinee and its adjacent examinee Lamplight brightness power judged, at a distance of alarm the highest device of lamplight brightness examinee be concealed earphone equipment carry Person, to realize the accurate positionin to using examinee that wireless invisible earpiece equipment practises fraud.
Description of the drawings:
Attached drawing 1 is that the Distributed Detection of the present invention positions the schematic diagram of audio frequency magnetic field signal source.In figure, where each examinee An audio frequency magnetic field signal minitype detecting device is arranged in the table number of desktop, audio frequency magnetic field signal source, as signal occur in No. 5 positions The range signal strength remoter from center of radiation center, radiation is lower, and audio frequency magnetic field signal is micro- in the table number around No. 5 positions Type detection device receives audio frequency magnetic field signal, and luminous alarm.
Attached drawing 2 is the schematic block circuit diagram of the detection device of the present invention.
Attached drawing 3 is a kind of sectional view of detection device of the present invention.In figure, 5 be button cell, and 6 be circuit board, and 7 be top Portion's Luminous cover, 8 be gum.
Attached drawing 4 is the light-emitting surface schematic diagram of the detection device of the present invention.In figure, 9 be light-emitting surface.
Attached drawing 5 is a kind of circuit diagram of the detection device of the present invention.In figure, 10 be feedback bias circuit.
Specific implementation mode:
Embodiment 1:
A kind of Distributed Detection localization method for the wireless invisible earpiece that cheats at one's exam, composition include:One group of audio frequency magnetic field signal Minitype detecting device, the audio frequency magnetic field signal minitype detecting device have alarm lamp, and the brightness of the alarm lamp is with sound The increase for the audio frequency magnetic field signal strength that frequency magnetic field signal minitype detecting device receives and brighten, with audio frequency magnetic field signal strength Reduction and it is dimmed;
According to the seat distribution mode of examination hall examinee, arrange that an audio frequency magnetic field signal is miniature in the position of each examinee Detection device, the light-emitting surface that the position of arrangement meets audio frequency magnetic field signal minitype detecting device can observe by invigilator personnel, The distribution of all audio frequency magnetic field signal minitype detecting devices forms a detection array, when the audio frequency magnetic field letter for occurring artificially generating Number when, the alarm lamp of the audio frequency magnetic field signal minitype detecting device in the audio frequency magnetic field signal driving detection array shines, Since the intensity of audio frequency magnetic field signal decays rapidly in air, lead to the alarm lamp positioned at audio frequency magnetic field signal source different distance Light emission luminance is different, and the highest alarm lamp of brightness is nearest apart from audio frequency magnetic field signal source, it is believed that the alarm lamp of the maximum brightness The examinee of position carries the audio frequency magnetic field signal source artificially generated, that is, the wireless invisible earpiece equipment to cheat at one's exam.
Embodiment 2:
According to the Distributed Detection localization method of the wireless invisible earpiece described in embodiment 1 that cheats at one's exam, the audio frequency magnetic field Signal minitype detecting device is worn on examinee, or is arranged on the desktop used in examinee, and the alarm lamp uses LED Indicator light.
Embodiment 3:
Distributed Detection localization method applied to the wireless invisible earpiece that cheats at one's exam described in embodiment 1 or 2 cheats at one's exam The audio frequency magnetic field signal minitype detecting device of wireless invisible earpiece, composition include:Audio frequency magnetic field signal receiving antenna 1, it is described Audio frequency magnetic field signal receiving antenna connect with power amplifier circuit 2, the power amplifier circuit and low-pass filtering electricity Road 3 connects, and the low-pass filter circuit is connect with alarm lamp 4, using button cell as the power supply of each electrical appliance.
Embodiment 4:
According to the audio frequency magnetic field signal minitype detecting device of the wireless invisible earpiece described in embodiment 3 that cheats at one's exam, described is low The signal frequency range of bandpass filter circuit output is the audiorange of 20-20000Hz, and the alarm lamp uses LED light.
Embodiment 5:
The audio frequency magnetic field signal minitype detecting device of the wireless invisible earpiece that cheats at one's exam according to embodiment 1 or 2 or 3 or 4, As shown in figure 5, audio frequency magnetic field detection device by audio frequency magnetic field signal receiving antenna, power amplifier circuit, low-pass filter circuit, The acousto-optic driving unit of alarm lamp forms.Audio frequency magnetic field signal receiving antenna can be by induction coil and capacitance group at audio resonance electricity Road selects inductance and capacitance parameter.(Such as need to extract the voice signal of 2kHz, it is 1uF, inductance that capacitance, which may be selected, Amount is 10mH)
Power amplifier circuit can be made of amplifier IC or triode, to make equipment steady operation, be introduced in amplifying unit suitable When feedback bias circuit(Feedback bias circuit is connected in parallel on power amplifier circuit both ends), audio-frequency electric magnetic wave decays in air More apparent, to increase the detection range of device, amplifying unit can be composed in series by multistage amplifier circuit,(Fig. 5)At B points, Electric signal less than 1mv in sensor circuit is amplified to 2V.
In the present embodiment, low-pass filter circuit is one stairs active wave filter, to weaken intermediate frequency in environment, high frequency The influence of electromagnetic wave makes device have good anti-interference,(Fig. 5)Output is the mixing that harmonic component is less than 3kHz at C points Voltage signal.
Acousto-optic instruction in equipment provides power drive by acousto-optic driving unit, and the unit is increased by N-channel in the present embodiment Strong type field-effect tube is realized, is provided fixed low pressure biasing since field-effect tube input impedance is very big, and for it, is introduced resistance R2.For general field-effect tube, the driving voltage of 1V or more can generate less than ten between the source electrode and drain electrode of scene effect pipe The conducting resistance of ohm.Therefore in the present embodiment, to make light-emitting diode correctly generate and alert indicate that, supply voltage is minimum to answer More than 2.5V.

Claims (4)

1. a kind of Distributed Detection localization method for the wireless invisible earpiece that cheats at one's exam, composition include:Prepare one group of audio magnetic Field signal minitype detecting device, it is characterized in that:
A) the audio frequency magnetic field signal minitype detecting device described in has alarm lamp, and the brightness of the alarm lamp is with audio frequency magnetic field The increase for the audio frequency magnetic field signal strength that signal minitype detecting device receives and brighten, with the reduction of audio frequency magnetic field signal strength And it is dimmed;
B) according to the seat distribution mode of examination hall examinee, arrange that an audio frequency magnetic field signal is micro- in the position of each examinee Type detection device, the light-emitting surface that the position arranged meets audio frequency magnetic field signal minitype detecting device can be by invigilator personal observations It arrives, the distribution of all audio frequency magnetic field signal minitype detecting devices forms a detection array;
C) when the audio frequency magnetic field signal for occurring artificially generating, the audio magnetic in the audio frequency magnetic field signal driving detection array The alarm lamp of field signal minitype detecting device shines;
D) since the intensity of audio frequency magnetic field signal decays rapidly in air, cause to be located at audio frequency magnetic field signal source different distance Alarm lamp light emission luminance it is different, the highest alarm lamp of brightness is nearest apart from audio frequency magnetic field signal source, and judgement thinks that this is most highlighted The examinee of the alarm lamp position of degree carries the audio frequency magnetic field signal source artificially generated, that is, the wireless stealth to cheat at one's exam Ear speaker device.
2. the Distributed Detection localization method of the wireless invisible earpiece according to claim 1 that cheats at one's exam, it is characterized in that:Institute The audio frequency magnetic field signal minitype detecting device stated is worn on examinee, or is arranged on the desktop used in examinee, described Alarm lamp uses LED light.
3. a kind of audio frequency magnetic field signal minitype detecting device of what claims 1 or 2 used cheat at one's exam wireless invisible earpiece, Composition includes:Audio frequency magnetic field signal receiving antenna, it is characterized in that:The audio frequency magnetic field signal receiving antenna and power amplifier Circuit connects, and the power amplifier circuit is connect with low-pass filter circuit, and the low-pass filter circuit connects with alarm lamp It connects, using button cell as the power supply of each electrical appliance.
4. the audio frequency magnetic field signal minitype detecting device of the wireless invisible earpiece according to claim 3 that cheats at one's exam, special Sign is:The signal frequency range of the low-pass filter circuit output is the audiorange of 20-20000Hz, the alarm lamp Using LED light.
CN201810774390.6A 2018-07-18 2018-07-18 Cheat at one's exam the Distributed Detection localization method and detection device of wireless invisible earpiece Pending CN108627876A (en)

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CN201810774390.6A CN108627876A (en) 2018-07-18 2018-07-18 Cheat at one's exam the Distributed Detection localization method and detection device of wireless invisible earpiece

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810774390.6A CN108627876A (en) 2018-07-18 2018-07-18 Cheat at one's exam the Distributed Detection localization method and detection device of wireless invisible earpiece

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111417074A (en) * 2020-03-26 2020-07-14 成都佳发安泰教育科技股份有限公司 Method and system for preventing cheating by positioning examinee position based on wifi

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111417074A (en) * 2020-03-26 2020-07-14 成都佳发安泰教育科技股份有限公司 Method and system for preventing cheating by positioning examinee position based on wifi
CN111417074B (en) * 2020-03-26 2021-05-07 成都佳发安泰教育科技股份有限公司 Method and system for preventing cheating by positioning examinee position based on wifi

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