CN102104437A - Radio system for preventing cheating on exams - Google Patents
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- CN102104437A CN102104437A CN2011100047432A CN201110004743A CN102104437A CN 102104437 A CN102104437 A CN 102104437A CN 2011100047432 A CN2011100047432 A CN 2011100047432A CN 201110004743 A CN201110004743 A CN 201110004743A CN 102104437 A CN102104437 A CN 102104437A
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Abstract
The invention discloses a radio system for preventing cheating on exams, which belongs to the fields of radio spectrum monitoring and radio interference. The system comprises radio monitoring equipment and signal interference equipment, wherein the radio monitoring equipment and the signal interference equipment are split; the radio monitoring equipment is connected with at least one piece of signal interference equipment, and transmits information such as signal frequency and the like to the signal interference equipment after detecting a cheating signal; and the signal interference equipment transmits a corresponding interference signal. The system adopts a discovery way so as not to cause interference to normal communication signals in an examination room like an interference suppression method; one piece of radio monitoring equipment can correspond to a plurality of pieces of signal interference equipment to realize full spectrum band interference to the signals; and cheating information is stored in a database so as to achieve the technical effect of high pertinence.
Description
Technical field
The present invention relates to a kind of radio examination anti-cheating system, belong to radio-frequency spectrum monitoring and radio interference field, prevent to use in the examination hall system of radio signal cheating, be specially adapted to various big-and-middle-sized examinations.
Background technology
In recent years, occur to use the various radio instrument phenomenon that cheats at one's exam, the cribber usually employs the gunman to enter the examination hall, in examination beginning a period of time, by the wireless image transmission manner examination question is spread out of the examination hall, establishment officer carries out answer then, at last answer is passed to examinee in the examination hall by radio signal again.During some high-grade, precision and advanced radiotechnicss just more and more were applied to and cheat at one's exam, this had seriously violated the examination method and has destroyed examination fairness, fairness.
The main means of taking at various radio cheatings are to disturb compacting at present, and disturbing the method for compacting is to carry out blind interference at certain radio frequency band, stops the possibility of utilizing this frequency range to practise fraud.And disturb the drawing method shortcoming is the interruption that also causes some proper communications of examination hall in shielding cheating signal, and it is powerless to the outer cheating signal of blind interference frequency range simultaneously.
Summary of the invention
The present invention is directed to existing radio anti-cheating method and do not cause the shortcomings such as interruption of proper communication at signal by force, easily, a kind of radio examination anti-cheating system is provided, this system can be by carrying out search sweep to each wave band of radio-frequency spectrum, to the cheating signal discern, demodulation, monitoring, and apply interference as required, the cheating information that simultaneously collection is monitored gathers so that analyze, pointed strong, characteristics that interference effect is good.
The present invention solves the problems of the technologies described above the technical scheme that adopted as following description:
A kind of radio examination anti-cheating system, comprise radio monitoring equipment and signal jamming equipment, described radio monitoring equipment and signal jamming equipment are split type, and described radio monitoring equipment is connected with at least one signal jamming equipment, described radio monitoring Equipment Inspection behind the cheating signal monitoring result by handle obtaining this cheating signal and handle after send to the signal jamming equipment, and then send corresponding interference signal by the signal jamming equipment.The monitoring result of cheating signal comprises frequency, power, access time, frequent degree, modulation system information.
Further, preferred construction is, described radio monitoring equipment, it comprises wideband omnidirectional reception antenna, radio-frequency module, intermediate frequency process module, baseband processing module, system control module, data memory module, audio frequency and video output module and correspondence with foreign country module; Wherein radio-frequency module, intermediate frequency process module, baseband processing module, system control module link to each other successively; Data memory module, audio frequency and video output module and correspondence with foreign country module link to each other with system control module respectively, wherein,
Described wideband omnidirectional reception antenna is used to receive full frequency band radio electromagnetsm ripple;
Described radio-frequency module, be used for radio signal that the wideband omnidirectional reception antenna is received be tuned to fixed intermediate frequency, obtain the intermediate frequency output of fixed-bandwidth;
Described intermediate frequency process module is used for the analog intermediate frequency signal that radio-frequency module obtains is changed into digital baseband signal, comprises the quadrature IQ signal and the frequency spectrum data of various bandwidth;
Described baseband processing module is used to realize identification, detection and demodulating algorithm, through obtaining the monitoring result of cheating signal, comprises information such as frequency, power, access time, frequent degree, modulation system;
Described system control module is used for tasks such as control audio video output module, data memory module and communicating by letter of signal jamming equipment, the monitoring result of cheating signal is carried out statistical analysis, and form database;
Described data memory module is used for stored program and Monitoring Data; Described audio frequency and video output module is used to show the monitoring result of signal of practising fraud, and by touch screen functionality input display parameters and the audio file of playing cheating information;
Described correspondence with foreign country module is used for the monitoring result after the transmission process and sends control information to the signal jamming equipment.
Further, preferred construction is that described signal jamming equipment comprises communication module, micro control module, waveform generation module, frequency multiplication and waveband selection module, power amplifier module and the potato masher antenna that is connected in turn; Wherein,
Described communication module is used to receive the dependent instruction of the jamming pattern that radio monitoring equipment sends;
Described micro control module is used for interpretive order, and the control signal jamming equipment moves, and waveform generation module and power amplifier module are controlled;
Described waveform generation module is used for obtaining the frequency point information that needs disturb according to the data that receive under the control of micro control module, and generates the interference signal of required frequency;
Described frequency multiplication and waveband selection module, the interference that is used to produce multiple frequency range for example obtains the interference of bigger frequency range;
Described power amplifier module is used for the wave shape gain of each frequency is amplified;
Described potato masher antenna is used to launch interference signal.
Further, preferred scheme is, described radio monitoring equipment by radio-frequency module in the enterprising line search scanning of each wave band, and output fixedly the 10.7MHz bandwidth be that the analog intermediate frequency signal of 10MHz enters among the intermediate frequency process module.
Further, preferred scheme is, described data memory module connects described system control module, but described system control module suspect signal is stored as the file of TXT form with the form of tabulation and but the audio file of suspect signal is kept among the described data memory module with the WAV form.
Further, preferred scheme is that the communication module in the described signal jamming equipment adopts gsm module, promptly by the signal of GSM network reception from radio monitoring equipment.
Further, preferred construction is that described waveform generation module obtains the frequency point information that needs disturb according to receiving data under the control of micro control module, and generates the interference signal of required frequency.
The contrast prior art, beneficial effect of the present invention is that the present invention is a discoverable type, so it can not disturb normal signal of communication in the examination hall as disturbing drawing method, native system is the full range band simultaneously, and it can realize that the full range band of cheating signal disturbs.
Therefore radio monitoring equipment of the present invention and signal jamming equipment separate, and the relation between them is a master slave relation, and radio monitoring equipment can corresponding many signal jamming equipments; Secondly,, finally can form form, have extraordinary technological merit and effect for special messenger's reference to the function that cheating information has storage, gathers and analyzes.
Description of drawings
By coming that below in conjunction with accompanying drawing the present invention is carried out further detailed description, above-mentioned advantage of the present invention and technique effect will become more obvious.
Fig. 1 is the structured flowchart of the radio monitoring equipment in the radio examination anti-cheating system of the present invention;
Fig. 2 is the radio monitoring circuitry schematic diagram in the radio examination anti-cheating system of the present invention;
Fig. 3 is the structured flowchart of the signal jamming equipment in the radio examination anti-cheating system of the present invention;
Fig. 4 is the signal jamming equipment circuit theory diagrams in the radio examination anti-cheating system of the present invention.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are described in further detail.
Fig. 1 is the structured flowchart of the radio monitoring equipment in the radio examination anti-cheating system of the present invention.
As described in Figure, described radio monitoring equipment, it comprises wideband omnidirectional reception antenna 0, radio-frequency module 1, intermediate frequency process module 2, baseband processing module 3, system control module 4, data memory module 5, audio frequency and video output module 6 and correspondence with foreign country module 7.Wherein wideband omnidirectional reception antenna, radio-frequency module 1, intermediate frequency process module 2, baseband processing module 3, system control module 4 link to each other successively; Data memory module 5, audio frequency and video output module 6 and correspondence with foreign country module 7 link to each other with system control module 4 respectively.Wherein,
Wideband omnidirectional reception antenna 0 is used to receive full frequency band radio electromagnetsm ripple;
Radio-frequency module 1, be used for radio signal that wideband omnidirectional reception antenna 0 is received be tuned to fixed intermediate frequency, obtain the intermediate frequency output of fixed-bandwidth;
Intermediate frequency process module 2 is used for the analog intermediate frequency signal that radio-frequency module 1 obtains is changed into digital baseband signal, comprises the quadrature IQ signal and the frequency spectrum data of various bandwidth;
Baseband processing module 3 is used to realize various identifications, detection and demodulating algorithm;
Data memory module 5 is used for stored program and Monitoring Data; Process software carries out statistical analysis to the cheating information of monitoring, and forms database.
Audio frequency and video output module 6 be used to show the information such as the frequency, power, access time of signal, frequent degree of practising fraud, and by touch screen functionality input display parameters, the while can be play the audio file of cheating information;
Correspondence with foreign country module 7 is used for the transmission of monitoring result and to the control information of signal jamming equipment.
And radio-frequency module 1, intermediate frequency process module 2, baseband processing module 3, system control module 4 link to each other successively; Data memory module 5, audio frequency and video output module 6 and correspondence with foreign country module 7 link to each other with system control module 4 respectively.
Fig. 2 is the radio monitoring circuitry schematic diagram in the radio examination anti-cheating system of the present invention.
By shown in Figure 2, described radio-frequency module 1 comprises radio-frequency front-end AR-ONE 8; Intermediate frequency process module 2 comprises analog-digital chip 9, multichannel down-conversion chip 10, programmable logic device FPGA 11, prom memory 12; Baseband processing module 3 comprises digital signal processing chip 13, memory FLASH 14, static memory 15; System control module 4 comprises embedded control system 16; Data memory module 5 comprises data local storage NandFlash 17; Audio frequency and video output module 6 comprises LCDs 18 and loud speaker 19; Correspondence with foreign country module 7 comprises gsm module 20.Radio-frequency front-end AR-ONE 8 joins with analog-digital chip 9, analog-digital chip 9 joins with multichannel down-conversion chip 10 and programmable logic device FPGA 11, FPGA 11 joins with PROM 12 memories and digital signal processing chip 13, digital signal processing chip 13 control radio-frequency front-end AR-ONE 8, and join with FLASH memory 14, static memory 15 and embedded system 16, embedded system 16 is joined with local storage 17, LCDs 18, loud speaker 19 and gsm module 20.
Fig. 3 is the structured flowchart of the signal jamming equipment in the radio examination anti-cheating system of the present invention.
As block diagram 3 as can be known, the jamming equipment of signal described in the present embodiment comprises gsm module, micro control module, waveform generation module, frequency multiplication and waveband selection module, power amplifier module, potato masher antenna.Gsm module 21, micro control module 22, waveform generation module 23, frequency multiplication and waveband selection module 24, power amplifier module 25, potato masher antenna 26 joins successively.
Wherein, gsm module is used for receiving instruction, i.e. the jamming pattern dependent instruction of radio monitoring equipment transmission.Micro control module is used for interpretive order, and the control signal jamming equipment moves, and waveform generation module and power amplifier module are controlled.Waveform generation module is used to produce interference waveform.Frequency multiplication and waveband selection module, the interference that produces bigger frequency range.Power amplifier module is used for the wave shape gain of each frequency is amplified.Potato masher antenna is used for emission and disturbs.
Fig. 4 is the signal jamming equipment circuit theory diagrams in the radio examination anti-cheating system of the present invention.
As shown in the figure, described waveform generation module 23 comprises programmable logic device FPGA 29 and frequency synthesizer 30; Frequency multiplication and waveband selection module comprise single-pole double-throw switch (SPDT) 31,37, low pass filter 32, amplifier 33,38,42, attenuator 34,39,43, varactor doubler 35,40, band pass filter 36,41, SP3T switch 44.Gsm module 27 joins with micro control module 28, micro control module 28 power controlling amplification modules 45 also join with programmable logic device FPGA 29, three- way switch 31,37,44 and join in the FPGA 29 control frequency multiplication modules with frequency synthesizer 30, frequency synthesizer 30 joins with frequency multiplication and waveband selection module 24, frequency multiplication and waveband selection module 24 are joined with power amplifier module 45, and power amplifier module 45 connects antenna 46.
And radio monitoring equipment is main control device, and the signal jamming equipment is a controlled plant.At first radio monitoring equipment is searched for, and demodulation is monitored, and transmission information is to the signal jamming equipment behind the lock onto target, and the signal jamming equipment provides the Optimal Jamming scheme implementation and disturbs according to these information.
Specific as follows of workflow of the present invention describe:
(1), system powers on initialization;
(2), radio-frequency module receives radio signals output fixed intermediate frequency signal;
(3), the fixed-bandwidth intermediate-freuqncy signal of radio-frequency module output carries out digitlization through the intermediate frequency process module, and be divided into two-way and carry out arrowband down-conversion and broadband down-conversion respectively;
(4), baseband processing module carries out algorithm process to intermediate frequency processing module output signal, the digital demodulation of realization cheating signal;
(5), cheating information is by system control module, storage also shows, sends work order to the signal jamming equipment simultaneously;
(6), the signal jamming equipment is according to the instruction that receives, produce interference signal and also apply interference.
The concrete steps of its work comprise step as described below:
At first, radio examination anti-cheating system is powered on each module initialization of system.
Radio-frequency module in the radio monitoring equipment receives radio signals, and output fixedly 10.7MHz bandwidth is the analog intermediate frequency signal of 10MHz.The radio-frequency module structure front end has a wideband omnidirectional monitoring aerial to receive radio signals, through overregulating rf gain control, filtering, secondary down-conversion, the intermediate-freuqncy signal of output fixed-bandwidth, fixed center frequency.Radio frequency part adopts the AR-ONE specialty wideband receiver of Japanese AOR company in the native system.The main feature of AR-ONE: the frequency range that receives is from 10KHz ~ 3.3GHz; Highly stable frequency oscillator; Have two external control serial ports; The superheterodyne reception front end of triple frequency conversions; BFO can regulate; Intermediate frequency is output as 10.7MHZ, and bandwidth reaches about 10MHz; Excellent sensitivity.At first utilizing antenna from the wireless space received RF signal, is 10.7MHz through AR-ONE output center frequency, and bandwidth is the analog intermediate frequency signal of 10MHz.Frequency through baseband processing module serial ports control AR-ONE is stepping with the 10MHz bandwidth, obtains successively from the signal of 10KHz ~ 3.3GHz full range band.
The fixed-bandwidth intermediate-freuqncy signal of radio-frequency module output is divided into two-way and carries out arrowband down-conversion and broadband down-conversion respectively through the digitlization of AD conversion chip.When selecting the AD conversion chip, adopted the AD6645 of American TI Company, it is 14 quantifications, keep sample rate can reach 80MS/s, Spurious-Free Dynamic Range (SFDR) is 100dB, and digital output can be worked under 3.3V, power consumption is 1.5W, and this chip can well be finished the data acquisition task.. it is that 10.7MHz, bandwidth are the broadband down-conversion of 10MHz that the intermediate-freuqncy signal after the digitlization of The Wideband Signal Processing passage is at first carried out centre frequency, through cut position with to go DC component, output center frequency be 0 16 I, Q signal; In order to suppress spectral leakage, with signal by time domain during to frequency domain transform, elder generation's windowing, I, Q signal after each 20 windowing of output, deposit in the register, reading in after 2048 20 I, the Q data with the I data by state machine control is that real part, Q data are that imaginary part is done 2048 fast Fourier transform (FFT), export calibrated, synthetic and take the logarithm, export 8 be the frequency spectrum data of unit with the decibel and these data are deposited to the FPGA internal storage, read spectrum analysis and monitoring after being used for by DSP.The fpga chip that is used for The Wideband Signal Processing is selected the chip Xilinx XC4VSX35 of altera corp, and it is the FPGA device 500MHz Smart RAM hierarchical memory that speed is fast, power is extremely low: 18kb, dual-port block RAM unit; 16/32bit LUT ram cell; The Peripheral storage interface; Can realize FIFO from the RAM module, and without any need for additional logic; Can realize distributed memory or shift register from the LUT module, and without any need for additional logic.500MHz is the LUT structure flexibly, compresses the CLB module faster, has 3,500,000 gate level circuits.The signal bandwidth of narrow band signal treatment channel after through the arrowband down-conversion is adjustable from 1MHz to 10KHz, output each I, Q signal of 16, read in by FPGA then, and be that a high position synthesizes 32 IQ signal with the Q signal, and this IQ signal deposited in the internal storage, can be read by dsp chip, the signal after being used for is separated mediation recording etc.For the narrow band signal treatment channel, a kind of high-performance multi-channel digital low-converter GC4016 that can select Craychip company to produce.It has 4 independently Digital Down Convert channel input signal speed can reach 100Msps, have Spurious-Free Dynamic Range greater than 115dB; In addition, GC4016 also has programmable features flexibly, its inside has 255 32 control word registers, can be used for determining the parameter setting (as centre carrier frequency, FIR filter coefficient, the form that extracts the factor, data output and mode etc.) of inner each functional module; The user can write control word by control interface, also can read some state information.
Baseband processing module carries out algorithm process to intermediate frequency processing module output signal, is mainly used in the digital demodulation that realizes the cheating signal, comprises AM, FM etc.Thereby and obtain the frequency spectrum of 20MHz by serial ports regulating and controlling radio-frequency (RF) local oscillator frequency to 1GHz, realize the scanning of full frequency band.The digital processing chip of native system is selected the ADSP-BF537 of AD company for use, it is a series of high-performance low-power-consumption dsp chips that ADI (Analog Device Inc.) company releases, and just adopted immediately by the designers of a lot of countries once releasing based on the ADSP-BF533 of Blackfin processor, follow-up series of products ADSP-BF5xx also is applied in separately the product by more system design producer.Exactly because the ADSP-BF5xx family chip is that the Blackfin processor with powerful performance brilliance is the efficient dsp chip that kernel is released.On the other hand, built-in Linux operating system can be moved, and data processing performance at a high speed can be kept based on the dsp chip of Blackfin series.Baseband signal processing unit among the present invention and task scheduling control module can realize that on same chip the structure of both having simplified has like this been saved cost again like this.
Cheating information is by system control module, and storage also shows, sends work order to the signal jamming equipment simultaneously.The frequency spectrum data that DSP calculates, demodulating datas etc. are transferred in the embedded OS by network interface, and operating system is dispatched various tasks according to the various data of user's needs scheduling use, finishes monitoring, reports to the police demodulation, work such as taking of evidence.The system control module of native system partly adopts to be selected to raise the YC2440 development board of wound company, and operating system is WinCE5.0.The Control Software of moving on this ARM plate is write with C#, and platform is .NET Compact Framework2.0.The function that the control of ARM plate is finished has:
(1) two mode of operations of fully automatic mode and manual intervention pattern;
(2) collection of background information, storage and importing;
(3) the dynamic demonstration of the setting of sweep parameter, spectrogram and suspicious frequency;
(4) but the pattern recognition of suspect signal.
There are two kinds of mode of operations in the ARM Control Software: fully automatic mode and manual intervention pattern:
(a) under the fully automatic mode, but frequency spectrum shows, the tabulation of suspicious signal shows, suspicious signal mode is discerned and the functions such as interference of suspect signal are finished automatically, does not need manual operation;
(b) under the manual intervention pattern, different sweep parameters can be set; But suspect signal needs manual operation to judge whether to disturb after producing.Fully automatic mode is fit to all groups to be operated, and the manual intervention pattern is fit to the professional and operates.
Introduce collection, storage and the importing of background information below.Software must carry out the collection of background information before operate as normal, promptly gather the spectrum information under the normal condition; Then background information is imported in the spectrum mask.When carrying out spectrum monitoring, can find suspect signal but real time spectrum and spectrum mask just compared.We save as the TXT file format to background information, are stored among the NandFlash among the ARM, and are very convenient during importing.
When the dynamic demonstration of the setting of sweep parameter, spectrogram and suspicious frequency enters the manual intervention pattern, at first sweep parameter to be set, comprise scanning initial frequency, cut-off frequency and detection threshold etc.Under the manual intervention pattern, the monitoring that sweep parameter is carried out frequency spectrum can be set flexibly; Sweep parameter is a fixed value under the fully automatic mode.After having scanned once, broader frequency spectrum figure dynamically updates once.In scanning process, be monitored greater than the signal of monitoring thresholding, form suspicious frequency.Suspicious frequency and background information template are compared, we think and the background information frequency differ very little (0.08MHz) but suspect signal be but that the vacation suspect signal is background information.But the suspect signal of having got rid of background information, but we think the real suspect signal signal of promptly practising fraud.But suspect signal dynamically shows with the formation of tabulation in software interface.
But under the pattern recognition fully automatic mode of suspect signal, but when suspect signal repeats several times, but software just carries out the modulation system that pattern recognition is an identification signal to suspect signal automatically.Under the manual intervention pattern, we carry out pattern recognition at manual operation.At first we select to carry out the frequency of pattern recognition in the ARM Control Software, send to DSP by network interface, and DSP sends to the frequency that AR-ONE comes setting signal by serial ports again.The AR-ONE dateout obtains the IQ two paths of data through giving GC4016 behind the A/D, gives Control Software through DSP by network interface.Algorithm for pattern recognition is realized in Control Software.The result of pattern recognition is the modulation system that forms suspicious frequency.
The cheating signal broadcast, record and playback.After pattern recognition is finished, the broadcast of the signal of can practising fraud, record and playback.When the signal of practising fraud was in real time play, we at first obtained suspicious signal frequency point and modulation system from Control Software, give DSP these information via network interfaces, and DSP gives AR-ONE again and sets accordingly.DSP utilizes serial ports to open the voice playing of AR-ONE more then, the broadcast of the signal of just can practising fraud in real time.When practising fraud the signal audio recording, we at first obtain suspicious signal frequency point and modulation system from Control Software, give DSP these information via network interfaces, and DSP gives AR-ONE again and sets accordingly.Audio frequency output is given ARM plate through mutual-recording line from AR-ONE then.In Control Software, we carry out recording of audio frequency, are storage the WAV form, are kept among the NandFlash of ARM plate.During the cheating signal playback, we get final product the WAV format audio File Open of recording in Control Software.
The statistical analysis of cheating information.The cheating information of collecting is deposited in the database, and we can utilize cheating information to obtain the statistical graph that needs in case of necessity, and the quantity of for example practising fraud is with the distribution map of frequency, the cheating quantity situation in each time or the like.So that whether are the frequency range that analysis cheating clique mainly utilizes and the wildness of cheating.
The data memory module that the data memory module native system uses is NandFlash, at first we deposit background spectra information among the NandFlash in the TXT form, so that relatively pick out suspicious frequency, but we are stored as the file of TXT form to suspect signal with the form of tabulation then, are placed among the NandFlash among the ARM.The content of tabulation comprises suspicious signal frequency point, amplitude, frequent degree, modulation system or the like.Simultaneously, the audio file of cheating signal also will be kept among the NandFlash with the WAV form.
Audio frequency and video output module audio frequency and video output module comprises two parts: audio frequency output and video output.
The audio output part branch: we can play back the audio file of the resulting WAV form in front by loud speaker.The video output: this part is presented at detected spectrum information on the liquid crystal display screen, allows the operator experience intuitively to have or not the existence of the signal of practising fraud.Simultaneously can carry out the display parameters setting by touch screen.
Correspondence with foreign country module: gsm module.It has finished communicating by letter between radio monitoring equipment and the signal jamming equipment.Because radio monitoring equipment and signal jamming equipment separate, and communicate by the GSM network between them.But we send to gsm module to the frequency of suspect signal by serial ports in the Control Software.
The signal jamming equipment produces interference signal and applies interference according to the instruction that receives.Be divided into the G100 SMS module that three module gsm modules adopt Beijing prompt wheat communication apparatus Co., Ltd.By the cheating information of GSM network reception from radio monitoring equipment.Micro control module is controlled the work of DTM056 power amplifier simultaneously according to the work of information Control FPGA such as the frequency of practising fraud, power.What this module was used is the C8051F330 chip of U.S. Silabs company.The key property of this chip is: analog peripheral; 10 ADC; Switching rate can reach 200Ksps; Can reach 16 single-ended or difference input VREF in outside, can in inner VREF, external pin or VDD, select; Inside or external conversion start the source; Built-in temperature sensor; 10 digit currents output DAC; Comparator; Hysteresis voltage able to programme and response time; Can be configured to and interrupt or reset source.
Waveform generation module is calculated by micro control module control FPGA and is received the frequency point information that data needing to obtain interference, and the control frequency synthesizer generates the interference signal of required frequency.The frequency signal frequency that the frequency synthesizer of native system module directly produces is 20MHz-280MHz, because the frequency range that will disturb is 20MHz-1GHz, then produces by the frequency multiplication module of back so surpass the frequency signal of 280MHz.
The frequency synthesizer that frequency synthesizer is selected for use is the AD9910 of AD company, and it is the Direct Digital Frequency Synthesizers of a built-in 14 DAC, supports up to the 1Gsps sampling rate.AD9910 adopts senior DDS patented technology, can greatly reduce power consumption under the prerequisite of any sacrifice in performance not.DDS/DAC constitutes the high frequency simulation output frequency synthesizer of digital programmable, can generated frequency is prompt under up to the frequency of 400MHz becomes sinusoidal wave.
The user can visit three signal controlling parameters that are used to control DDS, comprising: frequency, phase place and amplitude.This DDS utilizes 32 bit accumulators that fast frequency hopping and frequency tuning resolution are provided.Under 1Gsps sample rate rate, tuning resolution is about 0.23Hz.This DDS has also realized fast phase and amplitude handoff functionality.
The user can programme to the internal control register of AD9910 by serial i/o port, to realize the control to AD9910.AD9910 is integrated static RAM (SRAM) can be supported frequency, phase place and amplitude-modulated multiple combination.AD9910 also supports user-defined numerical control digital ramp mode of operation.Under this pattern, frequency, phase place or amplitude are linear change in time.
Multiple spectrum scan function of the present invention can be carried out the full frequency band entire scan, also can carry out emphasis scanning to frequency range occurred frequently by priori radio cheating information pointer.Also can carry out segmented scanning to interested frequency range.Have multiple monitoring mode, set alarm threshold, keyword is reported to the police according to the Word message and the voice messaging of demodulation result according to frequency spectrum level and signal occurrence frequency.And the cheating message transmission that has multiple communication interface to utilize GSM network or serial ports output to monitor is given the signal jamming equipment.Conflicting mode is disturbed by the single-point frequency, and the broadband frequency sweep is disturbed and formed; Disturb the sweep velocity scalable.
The present invention can be provided with credible frequency, and specific frequency is not disturbed, and guarantees some necessary communicate by letter unimpeded in the examination hall.Optional two kinds of mode of operations in the work, manual intervention pattern and fully automatic mode.
Under the manual intervention pattern, can be to the parameter of monitoring, the monitoring content manually is provided with; Under the fully automatic mode, but frequency spectrum shows, the tabulation of suspicious signal shows, suspicious signal mode is discerned and the functions such as interference of suspect signal are finished automatically, does not need manual operation.The result's of Monitoring Data and monitoring keeping function and statistical function: data are utilized local storage or circumscribed USB memory stores, can store a large amount of monitoring informations in database, and can carry out statistical analysis to the data in the database, obtain the statistical graph of the information of practising fraud.
The present invention is the networked radio anti-cheating system of a complete function, and it can contain the exam cheating operations of wireless system, safeguards the fairness of examination, correctly selects the talent significant to society, has extraordinary technique effect.
The above; it only is the specific embodiment of the present invention; but protection scope of the present invention is not limited thereto; anyly be familiar with the people of this technology in the disclosed technical scope of the present invention; can understand conversion and the replacement expected; all should be encompassed in of the present invention comprising within the scope, therefore, protection scope of the present invention should be as the criterion with the protection range of claims.
Claims (10)
1. radio examination anti-cheating system, comprise radio monitoring equipment and signal jamming equipment, it is characterized in that, described radio monitoring equipment and signal jamming equipment are split type, and described radio monitoring equipment is connected with at least one signal jamming equipment, described radio monitoring Equipment Inspection passes through to handle the monitoring result that obtains this cheating signal behind the cheating signal, send to the signal jamming equipment after the processing, and then send corresponding interference signal by the signal jamming equipment; The monitoring result of described cheating signal comprises frequency, power, access time, frequent degree, modulation system information.
2. radio examination anti-cheating system according to claim 1, it is characterized in that, described radio monitoring equipment comprises wideband omnidirectional reception antenna, radio-frequency module, intermediate frequency process module, baseband processing module, system control module, data memory module, audio frequency and video output module and correspondence with foreign country module; Wherein wideband omnidirectional reception antenna, radio-frequency module, intermediate frequency process module, baseband processing module, system control module link to each other successively; Data memory module, audio frequency and video output module and correspondence with foreign country module link to each other with system control module respectively, wherein,
Described wideband omnidirectional reception antenna is used to receive full frequency band radio electromagnetsm ripple;
Described radio-frequency module, be used for radio signal that the wideband omnidirectional reception antenna is received be tuned to fixed intermediate frequency, obtain the intermediate frequency output of fixed-bandwidth;
Described intermediate frequency process module is used for the analog intermediate frequency signal that radio-frequency module obtains is changed into digital baseband signal, comprises the quadrature IQ signal and the frequency spectrum data of various bandwidth;
Described baseband processing module is used to realize identification, detection and demodulating algorithm, through handling the monitoring result that obtains the cheating signal;
Described system control module is used for the communication task of control audio video output module, data memory module and signal jamming equipment, and the monitoring result of cheating signal is carried out statistical analysis, and forms database;
Described data memory module is used for stored program and Monitoring Data;
Described audio frequency and video output module is used to show the monitoring result of signal of practising fraud, and by touch screen functionality input display parameters and the audio file of playing cheating information;
Described correspondence with foreign country module is used for the monitoring result after the transmission process and sends control information to the signal jamming equipment.
3. radio examination anti-cheating system according to claim 1 and 2, it is characterized in that described signal jamming equipment comprises communication module, micro control module, waveform generation module, frequency multiplication and waveband selection module, power amplifier module and the potato masher antenna that is connected in turn; Wherein,
Described communication module is used to receive the dependent instruction of the jamming pattern that radio monitoring equipment sends;
Described micro control module is used for interpretive order, and the control signal jamming equipment moves, and waveform generation module and power amplifier module are controlled;
Described waveform generation module is used for obtaining the frequency point information that needs disturb according to the data that receive under the control of micro control module, and generates the interference signal of required frequency;
Described frequency multiplication and waveband selection module, the interference that is used to produce multiple frequency range;
Described power amplifier module is used for the wave shape gain of each frequency is amplified;
Described potato masher antenna is used to launch interference signal.
4. radio examination anti-cheating system according to claim 2, it is characterized in that, described radio monitoring equipment by radio-frequency module in the scanning of the enterprising line search of each wave band, and output fixedly the 10.7MHz bandwidth be that the analog intermediate frequency signal of 10MHz enters among the intermediate frequency process module.
5. radio examination anti-cheating system according to claim 2, it is characterized in that, but described system control module suspect signal is stored as the file of TXT form with the form of tabulation and but the audio file of suspect signal is kept among the described data memory module with the WAV form.
6. radio examination anti-cheating system according to claim 3 is characterized in that the communication module in the described signal jamming equipment adopts gsm module, promptly by the information of GSM network reception from radio monitoring equipment.
7. according to claim 1 or 2 or described any radio examination of 4-6 anti-cheating system, it is characterized in that described radio-frequency module comprises radio-frequency front-end AR-ONE; The intermediate frequency process module comprises analog-digital chip, multichannel down-conversion chip, programmable logic device FPGA, prom memory; Baseband processing module comprises digital signal processing chip, memory FLASH, static memory; System control module comprises embedded control system; Data memory module comprises data local storage NandFlash; The audio frequency and video output module comprises LCDs and loud speaker; The correspondence with foreign country module comprises gsm module; Radio-frequency front-end AR-ONE and analog-digital chip join, analog-digital chip joins with multichannel down-conversion chip and programmable logic device FPGA, FPGA and prom memory and digital signal processing chip join, digital signal processing chip control radio-frequency front-end AR-ONE, and join with FLASH memory, static memory and embedded system, embedded system and local storage, LCDs, loud speaker and gsm module join.
8. radio examination anti-cheating system according to claim 3 is characterized in that described radio-frequency module comprises radio-frequency front-end AR-ONE; The intermediate frequency process module comprises analog-digital chip, multichannel down-conversion chip, programmable logic device FPGA, prom memory; Baseband processing module comprises digital signal processing chip, memory FLASH, static memory; System control module comprises embedded control system; Data memory module comprises data local storage NandFlash; The audio frequency and video output module comprises LCDs and loud speaker; The correspondence with foreign country module comprises gsm module; Radio-frequency front-end AR-ONE and analog-digital chip join, analog-digital chip joins with multichannel down-conversion chip and programmable logic device FPGA, FPGA and prom memory and digital signal processing chip join, digital signal processing chip control radio-frequency front-end AR-ONE, and join with FLASH memory, static memory and embedded system, embedded system and local storage, LCDs, loud speaker and gsm module join.
9. radio examination anti-cheating system according to claim 3 is characterized in that described waveform generation module comprises programmable logic device FPGA and frequency synthesizer; Frequency multiplication and waveband selection module comprise single-pole double-throw switch (SPDT), low pass filter, amplifier, attenuator, varactor doubler, band pass filter, SP3T switch; Micro control module power controlling amplification module also joins with programmable logic device FPGA, three-way switch and join in FPGA control frequency multiplication and the waveband selection module with frequency synthesizer, frequency synthesizer and frequency multiplication and waveband selection module are joined, frequency multiplication and waveband selection module and power amplifier module join, and power amplifier module connects antenna.
10. radio examination anti-cheating system according to claim 3 is characterized in that workflow comprises the steps:
(1), system powers on initialization;
(2), radio-frequency module receives radio signals output fixed intermediate frequency signal;
(3), the fixed-bandwidth intermediate-freuqncy signal of radio-frequency module output carries out digitlization through the intermediate frequency process module, and be divided into two-way and carry out arrowband down-conversion and broadband down-conversion respectively;
(4), baseband processing module carries out algorithm process to intermediate frequency processing module output signal, the digital demodulation of realization cheating signal;
(5), cheating information is by system control module, storage also shows, sends work order to the signal jamming equipment simultaneously;
(6), the signal jamming equipment is according to the instruction that receives, produce interference signal and also apply interference.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100047432A CN102104437A (en) | 2011-01-11 | 2011-01-11 | Radio system for preventing cheating on exams |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100047432A CN102104437A (en) | 2011-01-11 | 2011-01-11 | Radio system for preventing cheating on exams |
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| CN2011100047432A Pending CN102104437A (en) | 2011-01-11 | 2011-01-11 | Radio system for preventing cheating on exams |
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Application publication date: 20110622 |