CN108024251A - A kind of wireless cheating signal management-control method - Google Patents
A kind of wireless cheating signal management-control method Download PDFInfo
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- CN108024251A CN108024251A CN201610974295.1A CN201610974295A CN108024251A CN 108024251 A CN108024251 A CN 108024251A CN 201610974295 A CN201610974295 A CN 201610974295A CN 108024251 A CN108024251 A CN 108024251A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
- H04W12/12—Detection or prevention of fraud
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/60—Jamming involving special techniques
- H04K3/62—Jamming involving special techniques by exposing communication, processing or storing systems to electromagnetic wave radiation, e.g. causing disturbance, disruption or damage of electronic circuits, or causing external injection of faults in the information
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- Computer Networks & Wireless Communication (AREA)
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Computer Security & Cryptography (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses a kind of wireless cheating signal management-control method, including：Obtain full frequency band wireless signal；Modulation recognition and identification are carried out to wireless signal, obtain wireless cheating signal；According to the modulation system of the wireless cheating signal, with reference to disturbance equation, the wireless management and control signal of the making wireless cheating signal；The wireless management and control signal is broadcasted, to block the wireless cheating signal.Wireless cheating signal can be accurately positioned using the embodiment of the present invention, so as to produce corresponding wireless management and control signal, prevent wireless signal from practising fraud.
Description
Technical field
The present invention relates to electronic communication technology field, more particularly to a kind of wireless cheating signal management-control method.
Background technology
In current examination system, test question information can be sent to by wireless signal illegal point outside examination hall by cribber
Son, after criminal receives test question information, using intercom, Vehicle mounted station and wireless signal transmitting device, by examination answer hair
Penetrate the reception device (intercom, mobile phone or form coil) carried to cribber.The cheating mode depends on wireless signal
Transmission, in this regard, examination hall monitoring personnel can use wireless shielding equipment carry out signal shielding.Existing wireless shielding equipment is only capable of
All standing formula shielding is carried out for default frequency range, as voice cheating tranmitting frequency mainly has：60-108MHz、130-174MH、
200-260MHz, 350-370MHz, 400-470MHz, 600-640MHz etc..But cribber is by making the nothing of special frequency channel
Line cheating signal, can avoid the shielding frequency range of wireless shielding equipment, realize cheating.Such as station channel by the legal station or
The other kinds of illegal station of person takes, and when the channel is in idle when taking an examination, cribber can use these channels, will make
Disadvantage signal hiding causes phenomenon of slipping through the net under other kinds of signal model.
The content of the invention
The embodiment of the present invention proposes a kind of wireless cheating signal management-control method, and wireless cheating signal can be accurately positioned, so that
Corresponding wireless management and control signal is produced, prevents wireless signal from practising fraud.
The embodiment of the present invention provides a kind of wireless cheating signal management-control method, including：
Obtain full frequency band wireless signal；
Modulation recognition and identification are carried out to the wireless signal, obtain wireless cheating signal；
According to the modulation system of the wireless cheating signal, with reference to disturbance equation, the nothing of the making wireless cheating signal
Spool control signal；
The wireless management and control signal is broadcasted, to block the wireless cheating signal.
Further, it is described that Modulation recognition and identification are carried out to the wireless signal, wireless cheating signal is obtained, specifically
For：
The signal characteristic of the wireless signal is extracted, and the signal characteristic is identified, will be unable to the wireless of identification
Signal confirms as the wireless cheating signal.
Further, it is described that Modulation recognition and identification are carried out to the wireless signal, wireless cheating signal is obtained, specifically
For：
According to default Probabilistic Decision-making or decision theory, likelihood ratio is determined, and wireless signal substitution is default general
Rate density function, determines cost function, then the minimum cost of the cost function is tried to achieve by the likelihood ratio；
The wireless signal for not meeting the minimum cost is confirmed as into the wireless cheating signal.
Further, the modulation system according to the wireless cheating signal, with reference to disturbance equation, makes described wireless
The wireless management and control signal of cheating signal, is specially：
The modulation system of the wireless cheating signal is analyzed, obtains the characteristic information of the wireless cheating signal；
With reference to following disturbance equation, jamming power P is calculatedJE；
Wherein, the K is blanket factor；PJFeed for jammer the power of antenna；GJRFor the hair that communicates on receiver direction
Penetrate the gain of machine antenna：GSRFor the gain of communication transmitter antenna on receiver direction；GRSTo be received on signal transmitter direction
The gain of antenna；GRJFor the gain of reception antenna on jammer direction；RSThe power of antenna is defeated by for signal transmitter；LSRFor letter
Propagated decay between number transmitted from transmitter to receiver；LJRFor jammer to the propagated decay between receiver；BJFor
Jamming signal bandwidth；BS is signal bandwidth；
According to the jamming power PJE, the wireless management and control signal of the making wireless cheating signal.
Further, before the acquisition full frequency band wireless signal, further include：The base of the wireless signal is launched in identification
Whether stand is pseudo-base station；
If it is, refusal obtains the wireless signal that the pseudo-base station is launched；
Otherwise, the wireless signal that the base station is launched is obtained.
Further, whether the base station that the wireless signal is launched in the identification is pseudo-base station, is specifically included：
According to the signal strength of the base station, the location updating frequency, Separate Dedicated Control Channel information or Location Area Identity,
Whether the base station that the wireless signal is launched in identification is pseudo-base station.
Further, in the broadcast wireless management and control signal, after blocking the wireless cheating signal, also wrap
Include：
Direction finding is carried out to the wireless cheating signal, to confirm the position of the transmitting equipment of the transmitting wireless cheating signal
Information.
Further, it is described that direction finding is carried out to the wireless cheating signal, specifically include：
By amplitude direction finding, phase direction finding, delay inequality direction finding or doppler direction finding technology, to the wireless cheating signal into
Row direction finding.
Implement the embodiment of the present invention, have the advantages that：
A kind of wireless cheating signal management-control method provided in an embodiment of the present invention, by obtaining full frequency band wireless signal, and
Modulation recognition and identification are carried out to it, extract wireless cheating signal, the modulation system combination further according to wireless cheating signal is dry
Equation is disturbed, corresponding wireless management and control signal is produced, broadcasts its wireless management and control signal, to block wireless cheating signal.Compared to
The prior art can only shield the wireless signal of a certain fixed frequency range, the present invention according to the communication standard feature of wireless cheating signal,
Generation has targetedly wireless management and control signal, improves management and control efficiency, prevents criminal from realizing cheating using frequency range loophole.
Brief description of the drawings
Fig. 1 is a kind of flow diagram of embodiment of wireless cheating signal management-control method provided by the invention.
Embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without creative efforts
Embodiment, belongs to the scope of protection of the invention.
It is a kind of flow diagram of embodiment of wireless cheating signal management-control method provided by the invention referring to Fig. 1, should
Method includes step 101 to 104, comprises the following steps that：
Step 101：Obtain full frequency band wireless signal.
In the present embodiment, full frequency band wireless signal is obtained by snooping equipment.It can also include before step 101：
Whether the base station of identification transmitting wireless signal is pseudo-base station；If it is, refusal obtains the wireless signal that pseudo-base station is launched；It is no
Then, the wireless signal launched base station is obtained.
In the present embodiment, whether the base station of identification transmitting wireless signal is pseudo-base station, is specifically included：According to the letter of base station
Number intensity, the location updating frequency, Separate Dedicated Control Channel information or Location Area Identity, the base station of identification transmitting wireless signal are
No is pseudo-base station.
Wherein, since mobile phone maintains a broadcast frequency point information list, which lists 6 surrounding legitimate base stations
Frequency point, the value of signal strength C1, C2.Therefore by monitoring base station C1, C2 values, if both significant differences, illustrate that the base station is
Pseudo-base station.Secondly as mobile phone turn-on time is shorter, off-grid after general 10~20S, therefore pseudo-base station can cause a large amount of mobile phone positions
Renewal is put, the statistics mobile phone location renewal frequency can identify the base station true and false.Furthermore pseudo-base station does not have speech business, and exist big
Measuring tank body length short message service, by monitoring Separate Dedicated Control Channel (SDCCH) information of analysis base station, can recognize that its is true
It is pseudo-.Finally the Location Area Identity (LAI) of pseudo-base station must be set to different from the true base station of surrounding, and ability trigger position more new technological process obtains
IMSI is taken, therefore the base station true and false is identified by the LAI of monitoring base station.
Step 102：Modulation recognition and identification are carried out to wireless signal, obtain wireless cheating signal.
Modulation recognition aids in determining whether the grade of radiation source, understands counterpart device type and the order of severity.Modulation recognition
It can be divided into amplitude modulation, phase modulation or frequency modulation by modulation system, can be divided into base band by signal type for simulation and numeral signal, if
Base band is digital signal, and is divided into various forms, such as BPSK, QPSK and BFSK etc..
In the present embodiment, step 102 is specially：The signal characteristic of wireless signal is extracted, and signal characteristic is known
Not, the wireless signal that will be unable to identification confirms as signal of wirelessly practising fraud.Signal characteristic includes：Waveform, frequency spectrum, centre frequency, band
Width, signal intensity feature etc., when system prestores the signal characteristic, can dock the modulation of the collection of letters number according to these features
Pattern carries out Classification and Identification.For example, being interrupted in the time domain waveform of continuous wave, interrupted sound can be heard after beat.
Shift frequency report time domain plethysmographic signal is continuous, and frequency spectrum is the equal spectral line for having certain distance of two cluster amplitudes, can be listened in low frequency
To different sound equipments.
In the present embodiment, step 102 can also be：According to default Probabilistic Decision-making or decision theory, likelihood ratio is determined,
And wireless signal is substituted into default probability density function, determine cost function, then cost function is tried to achieve most by likelihood ratio
Small cost；The wireless signal for not meeting minimum cost is confirmed as into signal of wirelessly practising fraud.In addition to Probabilistic Decision-making or decision theory,
The methods of can also use cyclic spectrum, higher order statistical, wavelet transform extract modulated signal feature, instead of or supplementary signal in time domain
Or the essential characteristic of frequency domain, identified so as to fulfill Modulation recognition.
Step 103：According to the modulation system of wireless cheating signal, with reference to disturbance equation, the nothing of wireless cheating signal is made
Spool control signal.
In the present embodiment, step 103 is specially：The modulation system of wireless cheating signal is analyzed, obtains wireless letter of practising fraud
Number characteristic information；
With reference to following disturbance equation, jamming power P is calculatedJE；
Wherein, K is blanket factor；PJFeed for jammer the power of antenna；GJRFor communication transmitter on receiver direction
The gain of antenna：GSRFor the gain of communication transmitter antenna on receiver direction；GRSFor reception antenna on signal transmitter direction
Gain；GRJFor the gain of reception antenna on jammer direction；RSThe power of antenna is defeated by for signal transmitter；LSRSent out for signal
Machine is penetrated to the propagated decay between receiver；LJRFor jammer to the propagated decay between receiver；BJFor interference
Signal bandwidth；BS is signal bandwidth；
According to jamming power PJE, make the wireless management and control signal of wireless cheating signal.
Above-mentioned all factors all have an impact the jamming power effectively needed to interference, i.e., they all produce interference effect
Raw to influence, i.e., they all have an impact for interference effect.Wherein influence maximum is bandwidth ratio and the path of interference and signal
Loss ratio.Pay attention to：Path loss L in the formulaSRAnd LJRFraction representation need to be used, such as path loss LSR=100dB, then bring into
It is 1/10 during formula10。
Step 104：Broadcast radio management and control signal, to block wireless cheating signal.
In the present embodiment, broadcasted by the way that wireless management and control signal is sent to blocking equipment, to block wireless cheating
Signal.Blocking equipment includes point frequency formula blocking equipment and sweep-frequency Békésy audiometer blocking equipment.It is preset or logical in equipment that point frequency formula, which blocks,
Cross external interface and insert some frequencies (come from common cheating frequency point), the signal generator in equipment, which produces corresponding point frequency, to be believed
Number, constantly transmitting achievees the purpose that the signal of communication for disturbing corresponding communications and liaison frequency during work, is generally used for professional cheating
The blocking of frequency point；It is to scan ripple by producing from frequency range low side to high-end fast periodic that sweep-frequency Békésy audiometer, which blocks, so that will interference
Energy covers whole frequency range, achievees the purpose that to disturb communication in the frequency range, is generally used for public correspondence frequency range, bluetooth, WIFI
The blocking of frequency range, can also be applied to specialty cheating frequency range.
As one kind citing of the present embodiment, further include after step 104：Direction finding is carried out to wireless cheating signal, with
Confirm the positional information of the transmitting equipment of the wireless cheating signal of transmitting.Carrying out direction finding to wireless cheating signal includes：Pass through amplitude
Direction finding, phase direction finding, delay inequality direction finding or doppler direction finding technology, direction finding is carried out to wireless cheating signal.Wherein, amplitude direction finding
Technology is the directional characteristic having using the level magnitudes of antenna induction, and when antenna is changed direction, output voltage amplitude presses pole
The principle that coordinate direction figure changes and changes carries out direction finding, therefore amplitude direction finding technology is also known as polar coordinates directional diagram direction finding skill
Art.Phase direction finding technology is the phase difference that signal is received by certain framework multiple (two or more) same antennas arranged evenly,
To obtain the direction of incoming wave signal.The lateral technology of interferometer is to measure the induced electricity of each a period of time unit on direction finding array antenna at the same time
Pressure, the relative direction of signal incidence direction-finder antenna is calculated using the phase difference between each induced voltage and related coefficient, in signal
In processing procedure, the phase difference of induced voltage must be kept constant between each a period of time unit, it may be necessary to compensation circuit or soft
Part is corrected.Delay inequality direction finding technology is similar to phase direction finding technology, is to utilize the separated antenna measurement transmitting of two or more
The transmitting signal in source, since the range difference that presence signal is propagated produces the difference of receiving time, and reaching time-difference is signal side
, can be in the hope of the arrival bearing of signal by calculating to the function at angle.In doppler direction finding system, the production of Doppler effect
Life is the relative motion between direction finding array antenna and radio wave transmission source, causes the phase that direction-finder antenna receives signal to occur
Change, be the signal frequency that actual received signal frequency is different from signal source transmitting.When direction-finder antenna is transported to signal source antenna
When dynamic, Doppler effect make it that receiving signal frequency substantially increases, on the contrary then reduce frequency.Actual doppler direction finding is not
The movement of direction-finder antenna, but the relative motion of direction-finder antenna and signal source is imitated by rotation direction finding array antenna.
As it can be seen that a kind of wireless cheating signal management-control method provided in an embodiment of the present invention, by obtaining full frequency band wireless communication
Number, and Modulation recognition and identification are carried out to it, wireless cheating signal is extracted, further according to the modulation system knot of wireless cheating signal
Disturbance equation is closed, corresponding wireless management and control signal is produced, broadcasts its wireless management and control signal, to block wireless cheating signal.Phase
Than the wireless signal that a certain fixed frequency range can only be shielded in the prior art, the present invention is special according to the communication standard of wireless cheating signal
Point, generation have targetedly wireless management and control signal, improve management and control efficiency, prevent criminal is realized using frequency range loophole from making
Disadvantage.
Further, the present invention is first identified the transmitting base station of wireless signal before wireless signal is obtained, can be preliminary
Isolate the signal of pseudo-base station transmitting, blocked for the signal of these pseudo-base stations transmitting, improve efficiency.
Further, the present invention carries out direction finding to wireless cheating signal, knows that its position is believed after management and control signal is broadcasted
Breath, for positioning cribber and its partner, in order to arrest criminal.
The above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also considered as
Protection scope of the present invention.
Claims (8)
- A kind of 1. wireless cheating signal management-control method, it is characterised in that including：Obtain full frequency band wireless signal；Modulation recognition and identification are carried out to the wireless signal, obtain wireless cheating signal；According to the modulation system of the wireless cheating signal, with reference to disturbance equation, make the wireless cheating signal without spool Control signal；The wireless management and control signal is broadcasted, to block the wireless cheating signal.
- 2. wireless cheating signal management-control method according to claim 1, it is characterised in that it is described to the wireless signal into Row Modulation recognition and identification, obtain wireless cheating signal, are specially：The signal characteristic of the wireless signal is extracted, and the signal characteristic is identified, will be unable to the wireless signal of identification Confirm as the wireless cheating signal.
- 3. wireless cheating signal management-control method according to claim 1, it is characterised in that it is described to the wireless signal into Row Modulation recognition and identification, obtain wireless cheating signal, are specially：According to default Probabilistic Decision-making or decision theory, likelihood ratio is determined, and the default probability of wireless signal substitution is close Function is spent, determines cost function, then the minimum cost of the cost function is tried to achieve by the likelihood ratio；The wireless signal for not meeting the minimum cost is confirmed as into the wireless cheating signal.
- 4. wireless cheating signal management-control method according to claim 1, it is characterised in that described according to the wireless cheating The modulation system of signal, with reference to disturbance equation, makes the wireless management and control signal of the wireless cheating signal, is specially：The modulation system of the wireless cheating signal is analyzed, obtains the characteristic information of the wireless cheating signal；With reference to following disturbance equation, jamming power P is calculatedJE；<mrow> <msub> <mi>P</mi> <mrow> <mi>J</mi> <mi>E</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>P</mi> <mi>J</mi> </msub> <mo>&CenterDot;</mo> <msub> <mi>G</mi> <mrow> <mi>J</mi> <mi>R</mi> </mrow> </msub> <mo>&GreaterEqual;</mo> <mi>K</mi> <mo>&CenterDot;</mo> <msub> <mi>R</mi> <mi>S</mi> </msub> <mo>&CenterDot;</mo> <msub> <mi>G</mi> <mrow> <mi>S</mi> <mi>R</mi> </mrow> </msub> <mo>&CenterDot;</mo> <mfrac> <msub> <mi>L</mi> <mrow> <mi>S</mi> <mi>R</mi> </mrow> </msub> <msub> <mi>L</mi> <mrow> <mi>J</mi> <mi>R</mi> </mrow> </msub> </mfrac> <mo>&CenterDot;</mo> <mfrac> <msub> <mi>G</mi> <mrow> <mi>R</mi> <mi>S</mi> </mrow> </msub> <msub> <mi>G</mi> <mrow> <mi>R</mi> <mi>J</mi> </mrow> </msub> </mfrac> <mo>&CenterDot;</mo> <mfrac> <msub> <mi>B</mi> <mi>J</mi> </msub> <msub> <mi>B</mi> <mi>S</mi> </msub> </mfrac> <mo>;</mo> </mrow>Wherein, the K is blanket factor；PJFeed for jammer the power of antenna；GJRFor communication transmitter on receiver direction The gain of antenna：GSRFor the gain of communication transmitter antenna on receiver direction；GRSFor reception antenna on signal transmitter direction Gain；GRJFor the gain of reception antenna on jammer direction；RSThe power of antenna is defeated by for signal transmitter；LSRSent out for signal Machine is penetrated to the propagated decay between receiver；LJRFor jammer to the propagated decay between receiver；BJFor interference Signal bandwidth；BS is signal bandwidth；According to the jamming power PJE, the wireless management and control signal of the making wireless cheating signal.
- 5. wireless cheating signal management-control method according to claim 1, it is characterised in that wireless in the acquisition full frequency band Before signal, further include：Whether the base station that the wireless signal is launched in identification is pseudo-base station；If it is, refusal obtains the wireless signal that the pseudo-base station is launched；Otherwise, the wireless signal that the base station is launched is obtained.
- 6. wireless cheating signal management-control method according to claim 5, it is characterised in that the identification transmitting is described wireless Whether the base station of signal is pseudo-base station, is specifically included：According to the signal strength of the base station, the location updating frequency, Separate Dedicated Control Channel information or Location Area Identity, identification Whether the base station for launching the wireless signal is pseudo-base station.
- 7. wireless cheating signal management-control method according to claim 1, it is characterised in that in the broadcast no spool Signal is controlled, after blocking the wireless cheating signal, is further included：Direction finding is carried out to the wireless cheating signal, to confirm that the position of the transmitting equipment of the transmitting wireless cheating signal is believed Breath.
- 8. wireless cheating signal management-control method according to claim 7, it is characterised in that described to the wireless cheating letter Number carry out direction finding, specifically include：By amplitude direction finding, phase direction finding, delay inequality direction finding or doppler direction finding technology, the wireless cheating signal is surveyed To.
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| CN201610974295.1A CN108024251A (en) | 2016-10-28 | 2016-10-28 | A kind of wireless cheating signal management-control method |
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| CN201610974295.1A CN108024251A (en) | 2016-10-28 | 2016-10-28 | A kind of wireless cheating signal management-control method |
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