CN106683305A - Anti-eavesdrop optical-fiber alarm system - Google Patents
Anti-eavesdrop optical-fiber alarm system Download PDFInfo
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- CN106683305A CN106683305A CN201710047321.0A CN201710047321A CN106683305A CN 106683305 A CN106683305 A CN 106683305A CN 201710047321 A CN201710047321 A CN 201710047321A CN 106683305 A CN106683305 A CN 106683305A
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/02—Mechanical actuation
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/443—Protective covering
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- Burglar Alarm Systems (AREA)
Abstract
The invention provides an anti-eavesdrop optical-fiber alarm system. The anti-eavesdrop optical-fiber alarm system comprises a laser, a circulator, an optical cable, a photoelectric conversion module, a signal processing module and an alarm module, wherein the optical cable comprises a communication optical fiber and a sensing optical fiber; a light output end of the laser is connected with a light incoming end of the sensing optical fiber by virtue of the circulator, the light incoming end of the sensing optical fiber is connected with the photoelectric conversion module by virtue of the circulator, the photoelectric conversion module is connected with the signal processing module, and the signal processing module is connected with the alarm module; the communication optical fiber is used for normal communication; and the sensing optical fiber is used for monitoring an intrusion situation. According to the anti-eavesdrop optical-fiber alarm system, another optical fiber is added in a protective layer of the optical cable, and a broken point and stress of the optical fiber in the protective layer are monitored by utilizing a distributive sensing way, so that a whole communication optical path is protected.
Description
Technical field
The present invention relates to optical fiber anti-eavesdrop field, and in particular to a kind of anti-eavesdrop optical fiber warning system.
Background technology
Fiber optic communication has become safely impact operational commanding and national security principal element.The U.S. is beautiful at the beginning of 1989
National security agency of state has just convened the item point fiber optic communication expert of the whole America to carry out the research work of optical fiber cable eavesdropping.American R ＆ D
Nuclear-powered submarine " Jimmy Ka Te " number in possess the special nacelle for carrying out submarine optical fiber cable eavesdropping, line number can be entered to submarine optical fiber cable
According to stealing, there is mainframe computer to be decrypted calculating on submarine.Newest information shows that the new technology in the U.S. can be with
Just can realize and circuit physical connection in the 1-2 seconds, this technology can not only steal data and can also invade link and send brokenly
Bad property is instructed, if invading command system, can to change war situation consequence hardly imaginable；Invading Rail Transit System can send
False command manufactures accident of trains' collision, and wartime initiates a plurality of circuit intrusion simultaneously can cause the whole railway system to be paralysed, from
And cause army to carry out railway and dispatch, or even social disturbances are caused, reach the purpose won without fighting a battle.
Land-line IPS is more difficult.My Corps Communications circuit kilometer up to ten thousand, has a large amount of circuits all common people's
In farmland, invader only needs to cover the enforcement eavesdropping that a green house of vegetables just can be very hidden.Therefore my Corps Communications circuit is ensured
Safety becomes a critical task.
Generally, intrusion event can all cause channel signal decay and power swing change etc..Some intrusion events
The phenomenon such as interruption appearance suddenly that communicates can be caused；Will cause error burst and burst power ripple during wiretap is installed
Dynamic, error code and power swing will gently change in a new level after wiretap deployment is finished.Existing fiber is eavesdropped
Detection technique is primarily directed to what these characteristics were taken precautions against.
The various methods adopted when being invaded due to enemy are not cause fiber cut and cause decay very little, therefore existing
There is technology to be difficult to detect intrusion event, even if detect event also to be difficult to be accurately positioned to invading position.
The content of the invention
For the anti-eavesdrop optical fiber warning system that defect of the prior art, the present invention are provided, by the outer shield in optical cable
Another road optical fiber of loading in set, and the mode using distributed sensing monitors the vibrations and pressure that produce when invader implements invasion
Deng physical quantity variation, intrusion behavior is confirmed, and realize being accurately positioned invasion point, realize carrying out protection guarantor to whole communication light path
The breakpoint of sheath inner fiber and stress occur, so as to protect to whole communication light path.Designed by light path toroidal inductive layer
The protection to center Communication Layer is strengthened, the accuracy rate of intrusion detecting is effectively increased, rate of false alarm is reduced.
A kind of anti-eavesdrop optical fiber warning system that the present invention is provided, including：Laser instrument, circulator, optical cable, opto-electronic conversion mould
Block, signal processing module and alarm module；The optical cable includes telecommunication optical fiber and sensor fibre；The light output end of the laser instrument
It is connected with the light incident side of the sensor fibre by the circulator, the light incident side of the sensor fibre is by the annular
Device is connected with the photoelectric conversion module, and the photoelectric conversion module is connected with the signal processing module, the signal processing
Module is connected with the alarm module；The telecommunication optical fiber is used for proper communication；The sensor fibre is used to monitor invasion situation；
The laser instrument is used to produce pulse laser；The photoelectric conversion module is used to receive the reflected light in the sensor fibre, and
Convert optical signals to the signal of telecommunication；The signal processing module is used to receive the signal of telecommunication of the photoelectric conversion module output, right
The signal of telecommunication is processed, and obtains monitoring result；The alarm module is used to be reported to the police according to the monitoring result.
Preferably, the telecommunication optical fiber is wrapped with oversheath, and the sensor fibre is embedded in institute in the way of stranded winding
In stating oversheath.
Preferably, including sensor fibre described in multichannel, the stranded winding in different directions respectively of sensor fibre described in multichannel
In the oversheath.
Preferably, sensor fibre described in multichannel is respectively adopted the optical fiber of different coating.
Preferably, the signal processing module specifically for：The signal of telecommunication is received, analog digital conversion is carried out and is obtained monitoring number
According to；If the Monitoring Data is more than the threshold value, it is determined that the corresponding point of the Monitoring Data is invasion point；According to the monitoring
The temporal information of data, is calculated invasion point coordinates.
Preferably, the signal processing module specifically for：The signal of telecommunication is received, analog digital conversion is carried out and is obtained monitoring number
According to；Noise reduction process is carried out to the Monitoring Data；Extract the eigenvalue of the Monitoring Data after noise reduction process；The eigenvalue is defeated
Enter the good grader of training in advance, obtain classification results；If the classification results are Human intrusion, Monitoring Data described in labelling
Corresponding point is doubtful invasion point, according to the temporal information of the Monitoring Data, is calculated doubtful invasion point coordinates, and is exported
Attack early warning；If the classification results, according to the temporal information of the Monitoring Data, are calculated invasion point to be invaded
Coordinate, and export intrusion alarm；If the classification results are extraneous invasion, coordinate calculating is not carried out.
Preferably, the eigenvalue for extracting the Monitoring Data after noise reduction process, including：By the monitoring number after noise reduction process
According to frequency-region signal is converted into, the spectrum information of the frequency-region signal is extracted as eigenvalue.
Preferably, it is further comprising the steps of between noise reduction process and extraction eigenvalue：By the monitoring number after noise reduction process
Mathematic interpolation is done according to normal data, if difference is more than threshold value of warning, noise reduction process is carried out.
Preferably, the training step of the grader includes：Mass data is gathered as sample data, to sample data
Type is marked；Noise reduction process is carried out to the sample data；Extract the eigenvalue of the sample data after noise reduction process；By sample
The eigenvalue input grader of notebook data, obtains class test result；If the class of the sample data of class test result and labelling
Type is different, then adjust the parameter of the grader；Obtain next group of sample data to be trained, until the output of the grader
As a result condition is met.
Preferably, the alarm module specifically for：If monitoring result is to monitor to invade signal, the monitoring is tied
Invasion point coordinates in fruit is sent to satellite, and receives the image information at the invasion point coordinates of satellite backhaul, is reported
Alert alert confirms, if confirmation generation eavesdropping event, issues warning message.
Description of the drawings
Fig. 1 is the structured flowchart of anti-eavesdrop optical fiber warning system provided in an embodiment of the present invention；
Fig. 2 is the structural representation of the optical cable with sensor fibre provided in an embodiment of the present invention；
Fig. 3 is the structural representation of the optical cable with sensor fibre provided in an embodiment of the present invention；
Fig. 4 is the structural representation of the optical cable with sensor fibre provided in an embodiment of the present invention.
Specific embodiment
The embodiment of technical solution of the present invention is described in detail below in conjunction with accompanying drawing.Following examples are only used for
Technical scheme is clearly illustrated, therefore is intended only as example, and the protection of the present invention can not be limited with this
Scope.
It should be noted that unless otherwise stated, technical term used in this application or scientific terminology should be this
The ordinary meaning that bright one of ordinary skill in the art are understood.
As shown in figure 1, a kind of anti-eavesdrop optical fiber warning system provided in an embodiment of the present invention, including：Laser instrument 1, annular
Device 2, optical cable 6, photoelectric conversion module 3, signal processing module 4 and alarm module 5.Optical cable 6 includes telecommunication optical fiber 8 and sensor fibre
7, the quantity of wherein telecommunication optical fiber 8 and sensor fibre 7 is not limited, and can be one or more.
Wherein, telecommunication optical fiber 8 is used for proper communication.Sensor fibre 7 is used to monitor invasion situation.Laser instrument 1 is used to produce
Pulse laser.Photoelectric conversion module 3 is used to receive the reflected light in sensor fibre 7, and converts optical signals to the signal of telecommunication.Signal
Processing module 4 is used to receive the signal of telecommunication of the output of photoelectric conversion module 3, and the signal of telecommunication is entered based on optical time domain reflection (OTDR) principle
Row is processed, and obtains monitoring result, and monitoring result includes whether intrusion event, and the place that intrusion event occurs.Report to the police
Module 5 is used to be reported to the police according to monitoring result.
The light output end of laser instrument 1 is connected by circulator 2 with the light incident side of sensor fibre 7, and the light of sensor fibre 7 enters
Penetrate end to be connected with photoelectric conversion module 3 by circulator 2, photoelectric conversion module 3 is connected with signal processing module 4, signal processing
Module 4 is connected with alarm module 5., through input sensor fibre 7, pulse laser is in sense light for the pulse laser of the output of laser instrument 1
Run in fine 7 and can be reflected after barrier point, the light being reflected back is photoelectrically converted after the reception of module 3, is entered by signal processing module 4
Row analytical calculation, obtains the corresponding coordinate of barrier point.
The anti-eavesdrop optical fiber warning system that the present embodiment is provided, by loading another road optical fiber in the protective layer of optical cable 6,
And the mode using distributed sensing monitors the physical quantity variation such as the vibrations that produce and pressure when invader implements invasion, confirm into
Invade behavior, and realize being accurately positioned invasion point, realize whole communication light path is carried out protecting the breakpoint of protective layer inner fiber and
Stress occurs, so as to protect to whole communication light path.Strengthened to center Communication Layer by the design of light path toroidal inductive layer
Protection, effectively increase the accuracy rate of intrusion detecting, reduce rate of false alarm.
Wherein, if alarm module 5 specifically for：Monitoring result is to monitor to invade signal, then by entering in monitoring result
Invade point coordinates and be sent to satellite, and receive the image information at the invasion point coordinates of satellite backhaul, carry out warning alert confirmation, if
Confirm eavesdropping event, then issue warning message, warning message can be issued by various ways such as network and short messages.By rear
Platform big data platform carries out alarm design analysis, the locking of invasion position, provides accurately to guard against vehicle, satellite, unmanned plane etc.
Invasion point coordinates, and pertinent image information is returned, warning alert confirmation is carried out, greatly reduce the wrong report of distributed sensing
Rate.
As shown in Fig. 2 telecommunication optical fiber 8 is wrapped with oversheath, sensor fibre 7 is embedded in oversheath in the way of stranded winding
In, the direction of winding can be clockwise, or counterclockwise, and the density of winding can be according to different protection needs
To design.Core communication circuit can more preferably be protected by hierarchical design.There is a common spy currently for the scheme of the eavesdropping of optical cable 6
Point, is required for peeling off the oversheath of telecommunication optical fiber 8, could install wiretap.Therefore, invader is destroying to oversheath
During, sensor fibre 7, or even the sensor fibre 7 that can fracture inherently are touched, produce very strong disturbing signal, such machine room
Interior monitoring host computer can be relatively easy the feature that collects significantly invade signal, then calculated by backstage big data platform
To accurate location coordinate, alert.
The sensor fibre 7 of plural radical can be wound in the oversheath of telecommunication optical fiber 8 with identical or different direction, increased
Plus the density of the winding of sensor fibre 7, make listener-in inevitably destroy sensor fibre 7 during peeling off oversheath.
Many sensor fibres 7 can adopt different coating, different coatings to increase sense of the optical fiber to different physical quantities
Should be able to power, such as temperature, stress, to meet the demand of different testing equipments so that the anti-eavesdrop optical cable 6 of the present embodiment can be same
Shi Caiyong various monitoring measures, are favorably improved monitoring sensitivity and accuracy rate.Such as adopt duplex coating technique, preferably internal layer
Coating is nickel coating, and outer coating is SiO2/EA/PUA (silicon dioxide/epoxy propylene acid esters/urethane acrylate) hydridization
Material.This pair of coating so that sensor fibre temperature control coefficient is high, has preferable stability, stress sensitive to temperature
Degree coefficient is high, improves the certainty of measurement and accuracy of temperature.
As shown in figure 3, can be monitored by two-way distributed sensing fiber 7, two-way sensor fibre 7 is respectively with difference
Direction it is stranded be wrapped in oversheath, signal distance not grow in the case of, can be two-way sensor fibre 7 away from laser instrument
1 end is connected, and is only monitored so as to cost-effective with a distributed sensing.
It is possible to further increase one or more sensor fibre 7 in communication layers, sensor fibre 7 and telecommunication optical fiber 8 are twisted
Close winding, redefine line sequence make invader be difficult to differentiate any bar be sensor fibre any bar be telecommunication optical fiber 8, increase invader's peace
The dress wiretap time strives for more Deal with Time for security department, greatly reduces invader's invasion effectiveness.
As shown in figure 4, give the more specifically structure chart of optical cable 6, be successively from inside to outside phosphating steel wire, communication layers,
Aluminium-plastic tape, polyethylene inner sheath, inductive layer, outer protective polyethylene set.Inductive layer and communication layers are constituted by multi-channel optical fibre, and one
Road optical fiber includes being enclosed within multifiber in Loose tube, the space between optical fiber fine cream filling, the sky in communication layers and inductive layer
Cable cream is filled with gap.Optical fiber in communication layers can all for communicating, or a part of optical fiber is used as sensor fibre 7.Sense
Layer is answered to need only to 1-3 root optical fiber for detecting, remaining optical fiber can be used for some non-concerning security matters communications.The phosphatization steel at the center of optical cable 6
Silk contributes to increasing the intensity of optical cable 6.
Wherein, the process step in signal processing module 4 includes：
Step S1, receives the signal of telecommunication, carries out analog digital conversion and obtains Monitoring Data.
Step S2, if Monitoring Data is more than threshold value, it is determined that the corresponding point of Monitoring Data is invasion point；Otherwise disregard and count
Point coordinates is invaded, next Monitoring Data is judged.
Step S3, according to the temporal information of Monitoring Data, is calculated invasion point coordinates, and is sent to alarm module 5.
Then, alarm module 5 receives the invasion point coordinates of the output of signal processing module 4, invasion point coordinates is sent to and is defended
Star, and the image information invaded at point coordinates of satellite backhaul is received, warning alert confirmation is carried out, if confirming eavesdropping thing
Part, then issue warning message.
Wherein, another preferred process step in signal processing module 4 includes：
Step S10, receives the signal of telecommunication, carries out analog digital conversion and obtains Monitoring Data.
Step S20, records the multiple Monitoring Data of same monitoring point, if find that the intensity of multiple Monitoring Data is presented being incremented by
Trend, it is determined that the monitoring point is invasion point.
Step S30, according to the temporal information of Monitoring Data, is calculated invasion point coordinates, and is sent to alarm module 5.
Then, alarm module 5 receives the invasion point coordinates of the output of signal processing module 4, invasion point coordinates is sent to and is defended
Star, and the image information invaded at point coordinates of satellite backhaul is received, warning alert confirmation is carried out, if confirming eavesdropping thing
Part, then issue warning message.
The method for optimizing improves capacity of resisting disturbance by carrying out multiple data statisticss to same monitoring point, reduces mistake
The probability of warning.During eavesdropping in real time, listener-in needs first to excavate ground, then destroys optical cable and is eavesdropped, this
During the signal that returns can also come stronger, using this characteristic, carry out invading energy accumulation statistics (i.e. same place it is multiple
Monitoring Data is presented increasing trend), the interference of other non-intrusive events can be effectively excluded, reach and accurately judge eavesdropping event
Purpose, improves the accuracy rate of warning.
When laser pulse is transmitted in a fiber, in time domain, incident illumination returns to optical fiber incidence end institute through backscattering
Take time as t, the distance that laser pulse is passed by a fiber is 2L, is had：
2L=Vt
Wherein, V is light transmission speed in a fiber；C is the light velocity in vacuum；N is optical fibre refractivity.Therefore, according to prison
Surveying the corresponding temporal information of data can obtain invading point coordinates.
Due to using the optical cable 6 in the present embodiment, being bound to destroy sense light during the destruction oversheath of optical cable 6
Fibre, therefore, signal processing module 4 can relatively easily collect feature and significantly invade signal, be reported to the police.Therefore, originally
The anti-eavesdrop optical fiber warning system of embodiment, implementation is simple, low cost, and invasion signal substantially, can greatly improve detection
Efficiency and accuracy rate.
There are various signal interference in natural environment, from STRESS VARIATION caused by the temperature change of slow modification, arrive
Vehicle vibration is widely present, the real tapped signal for all causing distributed sensing monitoring is submerged among numerous background noises.
This causes various distributed sensings during true environment application, often reports by mistake serious or even cannot use.Based on above-mentioned
Defect, the present embodiment constructs one based on machine learning and the grader of neutral net, the generation to different stress signals
It is analyzed with feature, and using the advantage of current computer high-speed data process, the study for carrying out big data is compared, by not
The self study process for updating the data disconnectedly makes rate of false alarm control in a rational scope.
The training step of grader includes：Collection mass data enters rower as sample data to the type of sample data
Note；Noise reduction process is carried out to sample data；Extract the eigenvalue of the sample data after noise reduction process；By the eigenvalue of sample data
Input grader, obtains class test result；If class test result is different from the type of the sample data of labelling, adjustment point
The parameter of class device；Obtain next group of sample data to be trained, until the output result of grader meets condition.
Wherein, using the means of on-the-spot test, common agro-farming operation, loaded vehicle such as are passed through, are excavated, rained at the vibration knot
Fruit is recorded by system and is used as sample data, and the rumble spectrum of various noises is different from intensity, by great amount of samples number
According to be analyzed the basic feature that obtains various types of interference type, the grader after the training of great amount of samples data can
It is because environment event causes or because invader's destruction is produced, reduces rate of false alarm to distinguish specific signal.
Based on above-mentioned grader, the process step in signal processing module 4 includes：
Step S100, receives the signal of telecommunication, carries out analog digital conversion and obtains Monitoring Data.
Step S200, to Monitoring Data noise reduction process is carried out.
Step S300, extracts the eigenvalue of the Monitoring Data after noise reduction process.
Step S400, by eigenvalue the good grader of training in advance is input into, and obtains classification results.
Step S500, if classification results are Human intrusion, the corresponding point of labelling Monitoring Data is doubtful invasion point, according to
The temporal information of Monitoring Data, is calculated doubtful invasion point coordinates, and exports attack early warning；If classification results are to be entered
Invade, then according to the temporal information of Monitoring Data, be calculated invasion point coordinates, and export intrusion alarm；If classification results are outer
Boundary invades and harasses, then do not carry out coordinate calculating.
Then, if alarm module 5 receives attack early warning or intrusion alarm, doubtful invasion point coordinates or invasion point are sat
Mark is sent to satellite, and receives the image information at the doubtful invasion point coordinates or invasion point coordinates of satellite backhaul, is reported to the police
Alert confirms, if confirmation generation eavesdropping event, issues warning message.So when invader digs the soil near the cable 6 that opens the light,
Early warning alarm will be triggered, to the personnel that arrest more plenty of time is provided, be reduced and even avoid invading loss occurrence.
Wherein, the optimal way of step S300 is：Monitoring Data after noise reduction process is converted into into frequency-region signal, frequency is extracted
The spectrum information of domain signal is used as eigenvalue.
Further, also include between step S200 and step S300：By Monitoring Data and criterion numeral after noise reduction process
According to mathematic interpolation is done, if difference is more than threshold value of warning, noise reduction process is carried out, otherwise do not carry out subsequent treatment.Wherein, criterion numeral
According to can take the multiple meansigma methodss without Monitoring Data during intrusion event, before the calculating of step S300 is carried out, first to whether depositing
Anticipation is made in intrusion event, decides whether to carry out subsequent treatment, can so reduce data processing amount.
Laser instrument is easily warm by work and operating current is affected, and causes power and the wavelength of output to change.When
When the centre wavelength of laser instrument changes, the decay in spread fiber also can change, and in a fiber spontaneous Raman dissipates
Penetrating the wavelength of the two-way scattered light of generation also can change, and also resulting in the loss factor in optical fiber can change, due to
The impact of the bandwidth of wavelength division multiplexer median filter, can make two-way light also can change in the loss of wavelength division multiplexer, these
Factor can all make the temperature of final demodulation produce error.Therefore, the stability of the output light of laser instrument must be high.The present embodiment
In laser instrument adopt high-power optical fiber laser.The good beam quality of optical fiber laser output, pulse width, energy are high, frequency
Rate is stablized, and the introducing of interference is reduced from light source, directly by optical fiber output pulse laser, reduces the luminous energy in output procedure
The loss of amount.
Laser wavelength is typically chosen 980nm, 1310nm or 1550nm, wherein, the transmission of the laser of 1550nm in optical fiber
Than larger, loss is smaller, and the wavelength of laser instrument is preferably 1550nm in the monitoring system of the present embodiment for distance.
Photodetector is mainly responsible for the conversion of photosignal in system, the quality of its performance directly with the letter of system signal
Make an uproar and compare, stability is relevant.In the system, need to detect that the comparison of reflected light is faint, it is therefore desirable to which big from responsiveness, gain is big
Photodetector.Conventional photodetector is mainly PIN photodiode and APD avalanche photodides.Wherein,
The characteristics of APD avalanche photodides have high sensitivity, noise equivalent power is low, is adapted to the detection of small-signal, then passes through
Amplifying circuit is amplified to the signal of telecommunication for exporting, wherein, amplifier will also meet low noise, high-gain, high bandwidth and height and turn
The characteristics of throw-over rate.In order to improve sensitivity and the monitoring distance of monitoring system, the photoelectric conversion module in the present embodiment is adopted
The APD avalanche photodides of the big high-gain of responsiveness detecting reflected light, and to be furnished with amplifying circuit, for amplifying APD snow
The signal that avalanche photo diode is collected, the amplifier in amplifying circuit is preferably provided with low noise, high-gain, high bandwidth and height and turns
The amplifier of throw-over rate.
Summary, the anti-eavesdrop optical fiber warning system that the present embodiment is provided, the resolution of monitoring can be reached to 10 meters
Magnitude, detection range can reach 50-90km.
Finally it should be noted that：Various embodiments above only to illustrate technical scheme, rather than a limitation；To the greatest extent
Pipe has been described in detail with reference to foregoing embodiments to the present invention, it will be understood by those within the art that：Its according to
So the technical scheme described in foregoing embodiments can be modified, either which part or all technical characteristic are entered
Row equivalent；And these modifications or replacement, do not make the essence disengaging various embodiments of the present invention technology of appropriate technical solution
The scope of scheme, it all should cover in the middle of the claim of the present invention and the scope of description.
Claims (10)
1. a kind of anti-eavesdrop optical fiber warning system, it is characterised in that include：Laser instrument, circulator, optical cable, photoelectric conversion module,
Signal processing module and alarm module；The optical cable includes telecommunication optical fiber and sensor fibre；
The light output end of the laser instrument is connected by the circulator with the light incident side of the sensor fibre, the sense light
Fine light incident side is connected by the circulator with the photoelectric conversion module, at the photoelectric conversion module and the signal
Reason module connection, the signal processing module is connected with the alarm module；
The telecommunication optical fiber is used for proper communication；
The sensor fibre is used to monitor invasion situation；
The laser instrument is used to produce pulse laser；
The photoelectric conversion module is used to receive the reflected light in the sensor fibre, and converts optical signals to the signal of telecommunication；
The signal processing module is used to receive the signal of telecommunication of the photoelectric conversion module output, at the signal of telecommunication
Reason, obtains monitoring result；
The alarm module is used to be reported to the police according to the monitoring result.
2. system according to claim 1, it is characterised in that the telecommunication optical fiber is wrapped with oversheath, the sensing
Optical fiber is embedded in the oversheath in the way of stranded winding.
3. system according to claim 2, it is characterised in that including sensor fibre described in multichannel, sense light described in multichannel
Fibre is stranded in different directions respectively to be wrapped in the oversheath.
4. system according to claim 3, it is characterised in that sensor fibre described in multichannel is respectively adopted the light of different coating
It is fine.
5. the system according to any one of Claims 1 to 4, it is characterised in that the signal processing module specifically for：
The signal of telecommunication is received, analog digital conversion is carried out and is obtained Monitoring Data；
If the Monitoring Data is more than the threshold value, it is determined that the corresponding point of the Monitoring Data is invasion point；
According to the temporal information of the Monitoring Data, invasion point coordinates is calculated.
6. the system according to any one of Claims 1 to 4, it is characterised in that the signal processing module specifically for：
The signal of telecommunication is received, analog digital conversion is carried out and is obtained Monitoring Data；
Noise reduction process is carried out to the Monitoring Data；
Extract the eigenvalue of the Monitoring Data after noise reduction process；
The eigenvalue is input into into the good grader of training in advance, classification results are obtained；
If the classification results are Human intrusion, the corresponding point of Monitoring Data described in labelling is doubtful invasion point, according to described
The temporal information of Monitoring Data, is calculated doubtful invasion point coordinates, and exports attack early warning；
If the classification results, according to the temporal information of the Monitoring Data, are calculated invasion point coordinates to be invaded,
And export intrusion alarm；
If the classification results are extraneous invasion, coordinate calculating is not carried out.
7. system according to claim 6, it is characterised in that the feature of the Monitoring Data after the extraction noise reduction process
Value, including：Monitoring Data after noise reduction process is converted into into frequency-region signal, the spectrum information of the frequency-region signal is extracted as spy
Value indicative.
8. system according to claim 6, it is characterised in that in noise reduction process and extract and also include between eigenvalue following
Step：Monitoring Data after noise reduction process and normal data are done into mathematic interpolation, if difference is more than threshold value of warning, noise reduction is carried out
Process.
9. system according to claim 6, it is characterised in that the training step of the grader includes：
Collection mass data is marked as sample data to the type of sample data；
Noise reduction process is carried out to the sample data；
Extract the eigenvalue of the sample data after noise reduction process；
The eigenvalue of sample data is input into into grader, class test result is obtained；
If class test result is different from the type of the sample data of labelling, the parameter of the grader is adjusted；
Obtain next group of sample data to be trained, until the output result of the grader meets condition.
10. system according to claim 1, it is characterised in that the alarm module specifically for：If monitoring result is prison
Measure invasion signal, then the invasion point coordinates in the monitoring result be sent to into satellite, and receive satellite backhaul it is described enter
The image information invaded at point coordinates, carries out warning alert confirmation, if confirming eavesdropping event, issues warning message.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107132629A (en) * | 2017-06-09 | 2017-09-05 | 南京华信藤仓光通信有限公司 | Optical fiber cable and its manufacture method with Fibre Optical Sensor and communication function |
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