CN206559372U - Examination hall is wirelessly practised fraud signal supervisory instrument - Google Patents
Examination hall is wirelessly practised fraud signal supervisory instrument Download PDFInfo
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- CN206559372U CN206559372U CN201720330692.5U CN201720330692U CN206559372U CN 206559372 U CN206559372 U CN 206559372U CN 201720330692 U CN201720330692 U CN 201720330692U CN 206559372 U CN206559372 U CN 206559372U
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Abstract
Wirelessly practised fraud signal supervisory instrument the utility model discloses a kind of examination hall, including the sound detector being sequentially connected, operational amplifier, A/D analog-digital converters and single-chip microcomputer governor circuit, the display being connected respectively with single-chip microcomputer governor circuit, warning circuit, observation circuit and voltage-stabilized power supply circuit；Sound detector is used to detect the wireless signal in the range of 1MHz ~ 8GHz；The voltage that operational amplifier is used to export sound detector enters from the inverting input of operational amplifier, with carrying out signal amplification after reference voltage contrast；A/D analog-digital converters are used to amplified signal being converted to digital detection signal；Single-chip microcomputer governor circuit sends alarm, and adjust automatically sensitivity, and control observation circuit shielding cheating signal for receiving digital detection signal, being shown in display, startup warning circuit.Simple in construction, performance is stable, can effective detection examination hall cheating signal frequency range, carry out accurately signal direction-finding and positioning and send alarm.
Description
Technical field
The utility model is related to a kind of signal supervisory instrument, more particularly to a kind of examination hall wirelessly practise fraud signal detection dress
Put, belong to signal detection and processing technology field.
Background technology
Today's society, with the continuous development of scientific technology, human society have begun to march toward the epoch of informationization, various
Communication equipment is even more to play indispensable role.We enjoy Information technology transition brought it is huge easily same
When, equally also it is faced with various electromagnetic pollutions and the various problems such as serious signal interference.Even there is criminal using
Psychology of getting high scores is wanted in life, is practised fraud to seek high yield by wireless signal.To ensure the fair and just property of an examination, just
Have to fundamentally prevent such situation generation.This, which is accomplished by design one, can realize signal closely is adopted
Collection and processing, and the monitoring device of precise positioning can be carried out in dense population.
Utility model content
Main purpose of the present utility model is, overcomes of the prior art not enough wirelessly practised fraud letter there is provided a kind of examination hall
Number detection means, be not only simple in structure, performance it is stable, radiationless, and can effective detection examination hall cheating signal frequency range, carry out
Accurately signal direction-finding and positioning and alarm is sent, accuracy of measurement is higher, be adapted to practical application.
In order to achieve the above object, the technical scheme that the utility model is used is：
Wirelessly practise fraud signal supervisory instrument, including sound detector, operational amplifier, the A/D being sequentially connected in a kind of examination hall
Analog-digital converter and single-chip microcomputer governor circuit, the display being connected respectively with single-chip microcomputer governor circuit, warning circuit, observation circuit
And voltage-stabilized power supply circuit；
The sound detector is used to detect the wireless signal in the range of 1MHz ~ 8GHz, the size output of wireless signal
Voltage represent to carry out input operational amplifier；
The voltage that the operational amplifier is used to export sound detector enters from the inverting input of operational amplifier,
A/D analog-digital converters are given with carrying out signal amplification after reference voltage contrast, and amplified signal being exported；
The A/D analog-digital converters are sent to single-chip microcomputer master control electricity for amplified signal to be converted into digital detection signal
Road；
The single-chip microcomputer governor circuit is used to receive digital detection signal, digital detection signal is shown in display, opened
Dynamic warning circuit sends alarm, and the adjust automatically sensitivity when not receiving digital detection signal, and by voltage-stabilized power supply electricity
Road powers and controlled observation circuit shielding cheating signal.
The utility model is further arranged to：The sound detector is AD8318 wave detectors.
The utility model is further arranged to：The operational amplifier is LM324 discharge circuits, including the be sequentially connected
One LM324 amplifiers, the 2nd LM324 amplifiers and the 3rd LM324 amplifiers；
The normal phase input end of the first LM324 amplifiers is connected by resistance R8 with voltage-stabilized power supply circuit and by electricity
R9 ground connection is hindered, the voltage signal of AD8318 wave detectors output passes through resistance R10 and the first LM324 amplifiers inverting input phase
Even, the output end of the first LM324 amplifiers is connected by resistance R11 with the inverting input of the first LM324 amplifiers；
The inverting input of the 2nd LM324 amplifiers is grounded by resistance R12 and passes through resistance R13 and second
The output end of LM324 amplifiers is connected, and the normal phase input end of the 2nd LM324 amplifiers is amplified by resistance R14 and the first LM324
The output end of device is connected；
The output end phase that the normal phase input end of the 3rd LM324 amplifiers passes through resistance R15 and the 2nd LM324 amplifiers
Even, the inverting input of the 3rd LM324 amplifiers is connected and passed through with the output end of the 3rd LM324 amplifiers by resistance R16
Resistance R17 is grounded, and the output end of the 3rd LM324 amplifiers is grounded by electric capacity C13.
The utility model is further arranged to：The single-chip microcomputer governor circuit includes the single-chip microcomputer main control chip being sequentially connected
And relay, the observation circuit is connected by relay with single-chip microcomputer main control chip, and observation circuit includes scan module, received
Module and transmitter module；
The scan module is used to be scanned in frequency range, finds wireless signal, and by the wireless communication monitored
Number it is sent to receiving module；
The receiving module is used to be received according to the selected frequency that receives, and the wireless signal received is sent to
Single-chip microcomputer main control chip；
The single-chip microcomputer main control chip is used to carry out Frequency Band Selection to the wireless signal received, determines whether cheating letter
Number, and drive transmitter module；
The transmitter module is used to be driven the disabling signal for sending cheating signal by single-chip microcomputer main control chip.
The utility model is further arranged to：The single-chip microcomputer main control chip is STC89S52 single-chip microcomputers.
The utility model is further arranged to：The STC89S52 single-chip microcomputers carry out serial ports by MAX232 chips and PC
Communication.
The utility model is further arranged to：The display is LCD1602 displays.
The utility model is further arranged to：The voltage-stabilized power supply circuit uses LM1117 integrated chips, the LM1117
The input of integrated chip is grounded by external filter capacitor C21, the output end of LM1117 integrated chips passes through external filtered electrical
Hold C22 ground connection.
Compared with prior art, the utility model has an advantageous effect in that：
Pass through setting for the sound detector being sequentially connected, operational amplifier, A/D analog-digital converters and single-chip microcomputer governor circuit
Put, and display, warning circuit, there is provided a kind of simple in construction, performance is steady for the setting of observation circuit and voltage-stabilized power supply circuit
Fixed, radiationless examination hall is wirelessly practised fraud signal supervisory instrument, its can effective detection examination hall cheating signal frequency range, carry out accurately
Signal direction-finding and positioning simultaneously send alarm, and accuracy of measurement is higher, are adapted to practical application.
The above is only the general introduction of technical solutions of the utility model, in order to be better understood upon technology of the present utility model
Means, the utility model will be further described below in conjunction with the accompanying drawings.
Brief description of the drawings
Fig. 1 is that the utility model examination hall is wirelessly practised fraud the structured flowchart of signal supervisory instrument；
Fig. 2 is that the utility model examination hall is wirelessly practised fraud the circuit diagrams of LM324 discharge circuits in signal supervisory instrument；
Fig. 3 is that the utility model examination hall is wirelessly practised fraud the circuit connection diagram of observation circuit in signal supervisory instrument；
Fig. 4 is that the utility model examination hall is wirelessly practised fraud the circuit of PC and singlechip serial port communication circuit in signal supervisory instrument
Figure；
Fig. 5 is that the utility model examination hall is wirelessly practised fraud the circuit diagram of power circuit in signal supervisory instrument.
Embodiment
With reference to Figure of description, the utility model is further described.
The examination hall that the utility model is provided wirelessly is practised fraud signal supervisory instrument, signal detection is included in structure, at signal
Reason and alarm and display three parts；As shown in figure 1, including the sound detector being sequentially connected, operational amplifier, A/D moduluses
Converter and single-chip microcomputer governor circuit, the display being connected respectively with single-chip microcomputer governor circuit, warning circuit, observation circuit and steady
Piezoelectricity source circuit.
The sound detector is used to detect the wireless signal in the range of 1MHz ~ 8GHz, the size output of wireless signal
Voltage represent to carry out input operational amplifier.
The voltage that the operational amplifier is used to export sound detector enters from the inverting input of operational amplifier,
A/D analog-digital converters are given with carrying out signal amplification after reference voltage contrast, and amplified signal being exported.
The A/D analog-digital converters are sent to single-chip microcomputer master control electricity for amplified signal to be converted into digital detection signal
Road.
The single-chip microcomputer governor circuit is used to receive digital detection signal, digital detection signal is shown in display, opened
Dynamic warning circuit sends alarm, and the adjust automatically sensitivity when not receiving digital detection signal, and by voltage-stabilized power supply electricity
Road powers and controlled observation circuit shielding cheating signal.
Wherein, the sound detector is AD8318 wave detectors, and it can accurately be surveyed as the signal detection device in system
Measure RF signal powers in 1MHz-8GHz bandwidth ranges, it is adaptable to various wireless communication infrastructure device, carry out received signal strength and refer to
Show and the detection of transmission power level；And signal by 9 cascade amplifying units amplify step by step after realize 8.7db voltage increase
Benefit, by each gain output end there is a square wave detector for effect to carry out having one inside shaping, and AD8318 wave detectors thereafter
Individual compensation feedback is compensated to signal, can avoid the increase of noise band and the gain reduction of receiver.
The operational amplifier is LM324 discharge circuits, as shown in Fig. 2 including the first LM324 amplifiers being sequentially connected
B, the 2nd LM324 amplifiers D and the 3rd LM324 amplifiers C；Two independent, Gao Zeng are included inside the LM324 discharge circuits
Benefit, the operational amplifier of internal frequency compensation, it is adaptable to which supply voltage scope very wide single supply is used, can equally be well applied to double
The mode of operation of power supply.So, wireless signal passes through AD8318 wave detector output voltages, and signal input is put by the first LM324
Big device B end of oppisite phase enters, and the contrast of voltage and reference voltage signal VS is carried out, as the voltage ratio reference voltage signal VS of output
Greatly, signal amplification is carried out by the 2nd LM324 amplifiers D and the 3rd LM324 amplifiers C, the voltage of output passes through A/D moduluses again
Converter carries out signal conversion.
As shown in Fig. 2 the normal phase input end of the first LM324 amplifiers passes through resistance R8 and voltage-stabilized power supply circuit phase
Even simultaneously it is grounded by resistance R9, the voltage signal of AD8318 wave detectors output is by resistance R10 and the first LM324 amplifiers
Inverting input is connected, and the output end of the first LM324 amplifiers passes through resistance R11 and the anti-phase input of the first LM324 amplifiers
End is connected.
The inverting input of the 2nd LM324 amplifiers is grounded by resistance R12 and passes through resistance R13 and second
The output end of LM324 amplifiers is connected, and the normal phase input end of the 2nd LM324 amplifiers is amplified by resistance R14 and the first LM324
The output end of device is connected.
The output end phase that the normal phase input end of the 3rd LM324 amplifiers passes through resistance R15 and the 2nd LM324 amplifiers
Even, the inverting input of the 3rd LM324 amplifiers is connected and passed through with the output end of the 3rd LM324 amplifiers by resistance R16
Resistance R17 is grounded, and the output end of the 3rd LM324 amplifiers is grounded by electric capacity C13.
By the converted signal of A/D analog-digital converters, then after Digital Signal Processing by single-chip microcomputer governor circuit,
Single-chip microcomputer governor circuit detects signal and sends signal alarm；, can be with if the signal that single-chip microcomputer governor circuit is received is very weak
Signal and repeating signal detection process are obtained by adjusting sensitivity, as shown in Figure 1.
The single-chip microcomputer governor circuit includes the single-chip microcomputer main control chip and relay being sequentially connected, and the observation circuit leads to
Cross relay with single-chip microcomputer main control chip to be connected, observation circuit includes scan module, receiving module and transmitter module, observation circuit
Switch control is used as by relay.
The utility model examination hall is wirelessly practised fraud the STC89S52 single-chip microcomputers that signal supervisory instrument is used, and scan module is in frequency
It is scanned in the range of rate, finds wireless signal, and the wireless signal monitored is sent to receiving module；Receiving module according to
The selected frequency that receives is received, and the wireless signal received is sent to single-chip microcomputer main control chip；Single-chip microcomputer main control chip
Frequency Band Selection is carried out to the wireless signal received, signal of practising fraud is determined whether, and drive transmitter module；Transmitter module is by list
Piece owner control chip drives send the disabling signal of cheating signal.As shown in figure 3, relay J has normally opened, normally-closed contact each one
Group.Initialize behind single-chip microcomputer main control chip port, if the control mouth P1.0 of single-chip microcomputer main control chip is high level, relay J is then
Work is stagnated, contact state is constant, after the control mouth P1.0 of single-chip microcomputer main control chip changes into low level by high level, after
Electrical equipment J normally closed interlock disconnects, normally open contact closure.When having detected cheating signal, single-chip microcomputer main control chip will drive
The diode D4 that transmitter module is sent in the disabling signal of the cheating signal, circuit is used to absorb in release relay J coils
The backward voltage of generation.
Wirelessly practise fraud the single-chip microcomputer STC89S52 that signal supervisory instrument is used in the utility model examination hall, is included in single-chip microcomputer
There is the serial interface of full duplex, by serial ports, using PC as visual Background control, by being programmed to single-chip microcomputer,
So as to reach shielding cheating signal function.Its serial communication uses MAX232 chips, P3.1 mouths and P3.2 with single-chip microcomputer
Mouth is connected, and when being communicated with single-chip microcomputer and PC by serial ports, though single-chip microcomputer has the function of serial communication, single-chip microcomputer is carried
The signal level of confession and RS232 standard are different, therefore to carry out level conversion by MAX232 chips.It can believe in high speed
Communicate the mistake that can't report an error under number.As shown in figure 4, MAX232 chip circumferences are 4 electrochemical capacitors（C18、C19、C20、C21）,
Notice that position must be close to chip when installation in circuit.
The display is LCD1602 displays, and the signal that effectively can be handled single-chip microcomputer and analog-digital converter well is strong
Weak degree is shown on screen, it is desirable to which accurate and brightness is clear.
The power circuit uses LM1117 integrated chips, easy to use, external two filter capacitors is only needed, with regard to energy
Change transient response.Shown in Fig. 5, the inputs of LM1117 integrated chips is grounded by external filter capacitor C21, LM1117 is integrated
The output end of chip is grounded by external filter capacitor C22.It is to be based on using LM1117 integrated chips as the core of power circuit
It has the power conversion chip of switch voltage-stabilizing principle, can obtain many Ripple Suppression ratios higher than standard voltage regulator, so tool
There are current limit and the function of Thermal protection.
Innovative point of the present utility model is that simple in construction, performance is stable, and practicality is high, and advantages compensate for tradition
The weak point such as unicity, the low linear, high bit-error of detector；The cheating letter of the different frequency range in energy effective detection examination hall
Number, and can accurately carry out signal direction-finding and positioning and send alarm, can constantly it be adjusted if invalid signals are judged as certainly
The sensitivity of body equipment, accuracy of measurement is higher, is adapted to practical application.
It is described above, only it is preferred embodiment of the present utility model, not makees any formal to the utility model
Limitation, although the utility model is disclosed above with preferred embodiment, but is not limited to the utility model, any ripe
Professional and technical personnel is known, is not being departed from the range of technical solutions of the utility model, when in the technology using the disclosure above
Hold the equivalent embodiment made a little change or be modified to equivalent variations, as long as without departing from technical solutions of the utility model
Hold, any simple modification, equivalent variations and the modification made according to technical spirit of the present utility model to above example,
In the range of still falling within technical solutions of the utility model.
Claims (8)
- The signal supervisory instrument 1. a kind of examination hall is wirelessly practised fraud, it is characterised in that：Put including the sound detector that is sequentially connected, computing Big device, A/D analog-digital converters and single-chip microcomputer governor circuit, the display being connected respectively with single-chip microcomputer governor circuit, warning circuit, Observation circuit and voltage-stabilized power supply circuit；The sound detector is used to detect the wireless signal in the range of 1MHz ~ 8GHz, the electricity of the size output of wireless signal Pressure represents to carry out input operational amplifier；The voltage that the operational amplifier is used to export sound detector enters from the inverting input of operational amplifier, with base Signal amplification is carried out after quasi- voltage-contrast, and amplified signal is exported gives A/D analog-digital converters；The A/D analog-digital converters are sent to single-chip microcomputer governor circuit for amplified signal to be converted into digital detection signal；The single-chip microcomputer governor circuit is used to receive digital detection signal, digital detection signal is shown in display, starts report Alert circuit sends alarm, and the adjust automatically sensitivity when not receiving digital detection signal, and is supplied by voltage-stabilized power supply circuit Electricity and control observation circuit shielding cheating signal.
- The signal supervisory instrument 2. examination hall according to claim 1 is wirelessly practised fraud, it is characterised in that：The sound detector is AD8318 wave detectors.
- The signal supervisory instrument 3. examination hall according to claim 2 is wirelessly practised fraud, it is characterised in that：The operational amplifier is LM324 discharge circuits, including the first LM324 amplifiers, the 2nd LM324 amplifiers and the 3rd LM324 amplifiers being sequentially connected；The normal phase input end of the first LM324 amplifiers is connected by resistance R8 with voltage-stabilized power supply circuit and by resistance R9 Ground connection, the voltage signal of AD8318 wave detectors output is connected by resistance R10 with the inverting input of the first LM324 amplifiers, The output end of first LM324 amplifiers is connected by resistance R11 with the inverting input of the first LM324 amplifiers；The inverting input of the 2nd LM324 amplifiers is grounded by resistance R12 and put by resistance R13 with the 2nd LM324 The output end of big device is connected, and the normal phase input ends of the 2nd LM324 amplifiers is defeated by resistance R14 and the first LM324 amplifiers Go out end to be connected；The normal phase input end of the 3rd LM324 amplifiers is connected by resistance R15 with the output end of the 2nd LM324 amplifiers, The inverting input of 3rd LM324 amplifiers is connected and by electricity by resistance R16 with the output end of the 3rd LM324 amplifiers R17 ground connection is hindered, the output end of the 3rd LM324 amplifiers is grounded by electric capacity C13.
- The signal supervisory instrument 4. examination hall according to claim 1 is wirelessly practised fraud, it is characterised in that：The single-chip microcomputer master control electricity Road includes the single-chip microcomputer main control chip and relay being sequentially connected, and the observation circuit passes through relay and single-chip microcomputer main control chip It is connected, observation circuit includes scan module, receiving module and transmitter module；The scan module is used to be scanned in frequency range, finds wireless signal, and the wireless signal monitored is sent out Give receiving module；The receiving module is used to be received according to the selected frequency that receives, and the wireless signal received is sent into monolithic Machine main control chip；The single-chip microcomputer main control chip is used to carry out Frequency Band Selection to the wireless signal received, determines whether signal of practising fraud, And drive transmitter module；The transmitter module is used to be driven the disabling signal for sending cheating signal by single-chip microcomputer main control chip.
- The signal supervisory instrument 5. examination hall according to claim 4 is wirelessly practised fraud, it is characterised in that：The single-chip microcomputer master control core Piece is STC89S52 single-chip microcomputers.
- The signal supervisory instrument 6. examination hall according to claim 5 is wirelessly practised fraud, it is characterised in that：The STC89S52 monolithics Machine carries out serial communication by MAX232 chips and PC.
- The signal supervisory instrument 7. examination hall according to claim 1 is wirelessly practised fraud, it is characterised in that：The display is LCD1602 displays.
- The signal supervisory instrument 8. examination hall according to claim 1 is wirelessly practised fraud, it is characterised in that：The voltage-stabilized power supply circuit Using LM1117 integrated chips, the inputs of the LM1117 integrated chips is grounded by external filter capacitor C21, LM1117 collection Output end into chip is grounded by external filter capacitor C22.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720330692.5U CN206559372U (en) | 2017-03-31 | 2017-03-31 | Examination hall is wirelessly practised fraud signal supervisory instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720330692.5U CN206559372U (en) | 2017-03-31 | 2017-03-31 | Examination hall is wirelessly practised fraud signal supervisory instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206559372U true CN206559372U (en) | 2017-10-13 |
Family
ID=60015568
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720330692.5U Expired - Fee Related CN206559372U (en) | 2017-03-31 | 2017-03-31 | Examination hall is wirelessly practised fraud signal supervisory instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206559372U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113747494A (en) * | 2021-10-11 | 2021-12-03 | 深圳大趋智能科技有限公司 | Power detection method and device of wireless terminal |
| CN113872710A (en) * | 2021-10-27 | 2021-12-31 | 中北大学 | Programmable radio signal real-time monitoring alarm system and method |
-
2017
- 2017-03-31 CN CN201720330692.5U patent/CN206559372U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113747494A (en) * | 2021-10-11 | 2021-12-03 | 深圳大趋智能科技有限公司 | Power detection method and device of wireless terminal |
| CN113872710A (en) * | 2021-10-27 | 2021-12-31 | 中北大学 | Programmable radio signal real-time monitoring alarm system and method |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171013 Termination date: 20190331 |
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| CF01 | Termination of patent right due to non-payment of annual fee |