CN109451281A - A kind of video monitoring system of high confidentiality - Google Patents
A kind of video monitoring system of high confidentiality Download PDFInfo
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- CN109451281A CN109451281A CN201811565510.8A CN201811565510A CN109451281A CN 109451281 A CN109451281 A CN 109451281A CN 201811565510 A CN201811565510 A CN 201811565510A CN 109451281 A CN109451281 A CN 109451281A
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- laser
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- fiber coupler
- chaotic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
- H04N7/181—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast for receiving images from a plurality of remote sources
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/001—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols using chaotic signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/22—Adaptations for optical transmission
Abstract
The invention discloses a kind of video monitoring system of high confidentiality, which includes: several Anti-theft video signal communication units and monitor terminal module；Wherein, each Anti-theft video signal communication unit includes: video signal collection encrypting module, video signal decoding module；It drives the light of laser transmitting after double optical feedback return circuit, optoisolator, fiber amplifier, fiber coupler FC2, enters video signal collection encrypting module all the way, another way enters balanced detector through the second response laser；Optical signal is input to the first response laser of video signal collection encrypting module through video signal decoding module, loads together in the balanced detector of encrypted transmission to video signal decoding module after the first delay line with the vision signal of IP Camera acquisition.The video information of acquisition is loaded on chaotic signal and transmits by present system, passes through the safety of video information transmission of two-way synchronous chaos information assurance.
Description
Technical field
The present invention relates to a kind of video monitoring systems, and in particular to a kind of video monitoring system of high confidentiality.
Background technique
Important component of the video monitoring as safety and protection system, with modern computer, network, image procossing,
The rapid development of transmission technology has evolved to the Network Video Surveillance of today after after simulation monitoring, digital supervision.Video
Monitoring system realizes video monitoring and the integration of meeting links, and can flexibly and effectively be managed to remote equipment.Video
Monitoring has the characteristics that intuitively, accurately, in time to enrich with the information content, passes through video recording, playback, the linkage to long-range monitored object
Alarm, monitoring strategies formulation, emergency command etc. application, can reach the dual function of monitoring and communication, thus meet comprehensively traffic,
Long-range monitoring and the emergency command demand of the every field such as water conservancy, oil field, bank, telecommunications.
Currently, Video Supervision Technique just towards networking, high Qinghua and universalness it is several in terms of develop, it is concerned by people heavy
How point mainly effectively monitors target.However, that but pays close attention in terms of the safety of monitoring information is relatively fewer.
Information security technology has most important effect in the key area for being related to politics, military, economy and national security.It is supervised in video
Prosecutor face, once leakage occurs in the video monitoring data for being applied to associated core field will cause irremediable damage to country
It loses.Based on this, effective information privacy technology is added in Video Supervision Technique to be particularly important.
Summary of the invention
The object of the present invention is to provide a kind of video monitoring systems of high confidentiality, and system solves the problem existing video monitorings
Easily there is the problem of monitoring information leaks in transmission process in technology, and it is logical the information that monitoring system acquires can be loaded into secrecy
It is transmitted on the chaotic carrier that letter system generates, to effectively guarantee the safety of video information transmission.
In order to achieve the above object, the present invention provides a kind of video monitoring systems of high confidentiality, if the system includes:
Dry Anti-theft video signal communication unit and monitor terminal module；Wherein, each Anti-theft video signal communication unit includes: view
Frequency signal acquisition encrypting module, video signal decoding module.
In the video signal decoding module, the light of driving laser transmitting through double optical feedback return circuits, optoisolator,
After fiber amplifier, fiber coupler FC2, enter the video signal collection encrypting module all the way, another way is through the second sound
Laser is answered to enter balanced detector, which has delay characteristics through what double optical feedback return circuits exported by injection
The chaotic signal of inhibition obtains the Chaotic Wideband Signal one that delay characteristics are suppressed more, which is used for
The vision signal of encryption is decrypted；Wherein, double optical feedback return circuits include the first external cavity feedback ring and the second exocoel is anti-
Ring is presented, the difference of the time delay of two external cavity feedback rings is equal to the half of the driving laser relaxation oscillation time, by double light
Feedback loop exports the chaotic signal that delay characteristics inhibit.
In the video signal collection encrypting module, optical signal is input to video through the video signal decoding module
First response laser of signal acquisition encrypting module, the vision signal after the first delay line with IP Camera acquisition load
Together in the balanced detector of encrypted transmission to the video signal decoding module；Wherein, the first response laser
The chaotic signal inhibited with delay characteristics exported by injection through double optical feedback return circuits, obtains delay characteristics and is suppressed more
Chaotic Wideband Signal two, the Chaotic Wideband Signal two is for encrypting vision signal.
The second response laser and the first response laser generate Chaotic Synchronous, delay characteristics quilt can be achieved respectively
The Chaotic Wideband Signal one and Chaotic Wideband Signal two of inhibition, by the adjusting of delay, power and polarization state to two signals,
The exportable decoded vision signal of balanced detector transmits a signal to the monitor terminal module.
Preferably, double optical feedback return circuits include: circulator, fiber coupler FC4, fiber coupler FC3, second
Delay line, Polarization Controller PC1, adjustable attenuator VA1, Polarization Controller PC2, adjustable attenuator VA2, fiber coupler FC5.
The light of the driving laser transmitting is after circulator, fiber coupler FC4, fiber coupler FC3, a part warp
Second delay line, Polarization Controller PC1 and adjustable attenuator VA1 are transmitted to fiber coupler FC5, and drive is fed back to after circulator
Dynamic laser forms the first external cavity feedback ring；Another part is transmitted to optical fiber coupling through Polarization Controller PC2 and adjustable attenuator VA2
Clutch FC5 feeds back to driving laser after circulator, forms the second external cavity feedback ring.
Preferably, the splitting ratio of the fiber coupler FC4 is 2:8, the fiber coupler FC2, fiber coupler FC5
Splitting ratio with fiber coupler FC3 is 5:5；After the fiber coupler FC4,80% partial light transmission is to described
Fiber coupler FC3.
Preferably, in the video signal decoding module, feed back to what driving laser obtained through the circulator
For the chaotic signal that delay characteristics inhibit again after optical isolation, fiber amplifier, fiber coupler FC2, a part enters polarization control
After device PC3 processed, adjustable attenuator VA3, it is transmitted to the first response laser；Another part is through Polarization Controller PC4, adjustable damping
Device VA4 is transmitted to the second response laser.
Preferably, the repressed Chaotic Wideband Signal of delay characteristics that the second response laser generates is believed once video
Adjustable attenuator VA5, Polarization Controller PC5 in number decoder module are transmitted to the balanced detector；First response
The repressed Chaotic Wideband Signal two of delay characteristics that laser generates is through fiber coupler FC1 and video signal decoding mould
Adjustable attenuator VA6 and Polarization Controller PC6 in block are transmitted to the balanced detector.
Preferably, the first response laser is electrically connected with first laser device controller；The second response laser
It is electrically connected with second laser controller；The driving laser is electrically connected with third laser controller.
Preferably, the fiber amplifier is EDFA Erbium-Doped Fiber Amplifier.
Preferably, the operation wavelength for driving laser, the first response laser, the second response laser is
1550nm。
Preferably, the monitor terminal module can adjust the angle and focal length of each IP Camera according to the actual situation.
Preferably, decoded vision signal is transmitted to by the balanced detector through data conversion module, router
The monitor terminal module；Decoded vision signal is converted into meeting the video of RJ45 transmission by the data conversion module
Signal.
The video monitoring system of high confidentiality of the invention, solves existing Video Supervision Technique and monitoring information easily occurs and exist
The problem of leaking in transmission process has the advantage that
(1) video information that IP Camera acquires can be loaded into secret signalling by monitoring system of the invention
It is transmitted on the chaotic carrier of generation, and drives two Chaotic Synchronous technology by one, it is special that a response laser obtains time delay
Further suppression of chaotic carrier signal is levied, the encryption for realizing video information using the chaotic carrier signal, another response
Laser obtains the further suppression of chaotic carrier signal of delay characteristics, by adopting to video signal decoding module and vision signal
Collect the adjusting of the time delay, power and polarization state of encrypting module two-way chaotic signal, two-way chaotic signal can realize the same of high quality
Step, through the exportable decoded vision signal of balanced detector, to effectively guarantee the safety of video information transmission；
(2) monitoring system of the invention introduces two-way light feedback (external cavity feedback) on semiconductor laser, passes through control
The chamber length and feedback intensity of two exocoels make two exocoel time delays and the reciprocal of the relaxation oscillation frequency of laser are driven to meet one
Fixed relationship, so that effective inhibition can be obtained in the delay characteristics of laser output；
(3) monitoring system of the invention, the chaotic signal inhibited using the delay characteristics that double external cavity feedback lasers obtain
Be injected into the matched response Distributed Feedback Laser of two parameters, two response lasers can obtain delay characteristics be further suppressed,
The chaotic signal that bandwidth is reinforced, and two chaotic signals can realize the Chaotic Synchronous of high quality；
(4) monitoring system of the invention, the work of driving laser, the first response laser, the second response laser
Wavelength is 1550nm, can be conducive to the popularization and application of the Video Supervision Technique of this secrecy with existing fiber system compatible.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the video monitoring system of high confidentiality of the invention.
Fig. 2 is the specific transmission figure of the video monitoring system of high confidentiality of the invention.
Specific embodiment
The technical scheme in the embodiments of the invention will be clearly and completely described below, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without making creative work belongs to the model that the present invention protects
It encloses.
Embodiment 1
A kind of video monitoring system of high confidentiality, as shown in Figure 1, being the video monitoring system of high confidentiality of the invention
Structural schematic diagram, as shown in Fig. 2, for high confidentiality of the invention video monitoring system specific transmission scheme, the system packet
It includes: multiple Anti-theft video signal communication units and monitor terminal module；Wherein, each Anti-theft video signal communication unit packet
It includes: video signal collection encrypting module, video signal decoding module.The monitor terminal can be computer.
Wherein, video signal decoding module includes: that double optical feedback return circuits, optoisolator OI 19, fiber amplifier 18 (are mixed
Bait fiber amplifier EDFA1), fiber coupler FC2 17, Polarization Controller PC4 16, adjustable attenuator VA4 15, the second sound
Answer laser 14 (R-DFB2), second laser controller 13, Polarization Controller PC5 12, adjustable attenuator VA5 11, adjustable
Attenuator VA6 9, Polarization Controller PC6 10, balanced detector 31, data conversion module 32, driving laser (D-DFB) 30
With third laser controller 29.
Wherein, video signal collection encrypting module includes: IP Camera 1, fiber optical transceiver 2, the first delay line 3,
One laser controller 4, first responds laser 5 (R-DFB1), adjustable attenuator VA3 6, Polarization Controller PC3 7, optical fiber
Coupler FC1 8.
Video signal collection encrypting module, video signal decoding module and monitor terminal module pass through data conversion module
32, router 33 connects.
Third laser controller 29 is electrically connected with driving laser D-DFB 30, and control driving laser D-DFB 30 is sent out
Optical signals generate the chaotic signal that delay characteristics inhibit through double optical feedback return circuits, then through optoisolator OI 19, fiber amplifier
It is divided into two-way after device 18, fiber coupler FC2 17:
(1) it is transmitted to the Polarization Controller PC3 7 of video signal collection encrypting module all the way, continues on through adjustable attenuator
VA3 6, first responds laser 5 (R-DFB1) and exports the further suppression of Chaotic Wideband Signal two of delay characteristics, prolongs through first
Slow line 3 is transmitted to fiber coupler FC1 8, and the vision signal of IP Camera acquisition is transmitted to optical fiber coupling through fiber optical transceiver 2
Clutch FC1 8, the chaotic signal load inhibited with the delay characteristics obtained through the first delay line 3 realize that vision signal adds together
It is close, to realize the encryption for the video information transmitted to system, then will through adjustable attenuator VA6 9, Polarization Controller PC6 10
Coded signal is transmitted to balanced detector 31；
(2) another way is transmitted to Polarization Controller PC4 16, adjustable attenuator VA4 15, second response 14 (R- of laser
DFB2 the further suppression of Chaotic Wideband Signal one of delay characteristics) is exported, through adjustable attenuator VA5 11, Polarization Controller PC5
12 are transmitted to balanced detector 31.
Above by the first delay line 3, adjustable attenuator VA6 9, Polarization Controller PC6 10, adjustable attenuator VA5
11, it is mixed to control to adjust two-way in video signal decoding module and video signal collection encrypting module respectively by Polarization Controller PC5 12
Time delay, power and the polarization state of ignorant signal (Chaotic Wideband Signal two and Chaotic Wideband Signal one), two-way chaotic signal can be realized
The synchronization of high quality, and decoded vision signal is exported after balanced detector 31, the decoding exported from balanced detector 31
Signal afterwards is converted into meeting the vision signal of RJ45 transmission after data conversion module 32, transmits a signal to monitor terminal mould
Block 34, to realize the monitoring to predeterminated target.In addition, computer terminal according to the actual needs can adjust camera angle and
The focal length of camera lens.
Above-mentioned double optical feedback return circuits include: circulator 20, fiber coupler FC4 21, fiber coupler FC3 22, second
Delay line 23, Polarization Controller PC1 24, adjustable attenuator VA1 25, Polarization Controller PC2 26, adjustable attenuator VA2 27,
Fiber coupler FC5 28.Optical signal is divided into two parts after circulator 20, fiber coupler FC4 21:
(1) a part is divided into two-way after being transmitted to fiber coupler FC3 22, all the way through the second delay line 23, Polarization Control
Device PC1 24, adjustable attenuator VA1 25 are transmitted to fiber coupler FC5 28, most feed back to driving laser through circulator 20 afterwards
Device 30 forms the first external cavity feedback ring；
(2) another part is transmitted to fiber coupler FC5 28 through Polarization Controller PC2 26, adjustable attenuator VA2 27,
Driving laser 30 most is fed back to through circulator 20 afterwards, forms the second external cavity feedback ring.
Above-mentioned second delay line 23 is used to adjust the difference of two external cavity feedback rings delay to being approximately equal to and drives laser 30
The half of relaxation oscillation time.
Specifically, one is entered after circulator OC (optical fiber circulator) 20 by the light that driving laser (D-DFB) is issued
A splitting ratio is the fiber coupler FC3 that then 80% part is 5:5 through splitting ratio in the fiber coupler FC4 21 of 2:8
22, one of part is again through fibre delay line 23, Polarization Controller PC1 24, adjustable attenuator VA1 25, splitting ratio 5:5
Fiber coupler FC5 28 and circulator OC 20 after feed back to laser constitute the first external cavity feedback ring；From fiber coupler
The other light that FC3 22 is exported is through Polarization Controller PC2 26, adjustable attenuator VA2 27, the optical fiber coupling that splitting ratio is 5:5
Laser is fed back to after clutch FC5 28 and circulator OC 20 constitutes the second external cavity feedback ring.
Specifically, the splitting ratio of fiber coupler FC2 17 is 5:5.
Specifically, commercialization DFB can be used in laser of the invention, and the cost of system can be effectively reduced.
The working principle of the video monitoring system of high confidentiality of the invention is the secrecy transmission based on chaotic signal, and mesh
The preceding chaotic signal generated based on light feedback semiconductor laser has apparent delay characteristics mostly, is easy to be realized by third party
System reconfiguration, this will will lead to huge security breaches.In addition, being influenced by semiconductor laser relaxation oscillation, light feedback half
The energy for the chaotic signal that conductor laser generates is concentrated mainly near relaxation oscillation frequency on frequency domain, causes frequency spectrum uneven
Smooth, low frequency inhibits serious, narrow bandwidth, this can seriously limit the transmission rate of chaotic optical communication.The view of high confidentiality of the invention
Frequency monitoring system, the chaotic signal being effectively suppressed using delay characteristics, working principle are specific as follows:
Firstly, controlling the operating current and temperature of driving laser 30 using laser controller, then prolong by second
Slow line 23 adjusts the difference that two external cavity feedback rings are delayed to the half for being approximately equal to the driving 30 relaxation oscillation time of laser；
Then, strong by the feedback in adjustable attenuator VA1 25 and adjustable attenuator VA2 27 two feedback loops of adjusting
Degree makes that laser 30 is driven to export chaotic signal under two external cavity feedback rings respectively；
Finally, driving laser 30 chaos that exportable delay characteristics inhibit under two specific external cavity feedback rings letter
Number, this chaotic signal is injected into two response lasers (the first response laser 5 and the second response laser 14), two
The exportable delay characteristics of a response laser further repressed Chaotic Wideband Signal, and this symmetrical Chaotic Synchronous of utilization
System can make the Chaotic Synchronous of the chaotic signal realization high quality of two response laser outputs, the video that camera is acquired
The encryption of video information can be achieved into the Chaotic Wideband Signal two of the first response laser output for signal loading, in vision signal
Encrypted vision signal is input to balance detection with the Chaotic Wideband Signal one generated by the second response laser by decoding end
Device, the decoding of video information can be realized using the high quality Chaotic Synchronous of two paths of signals, to realize that the secrecy of video information passes
It is defeated.
In addition, it is whole to enter computer after the router that the video signal communication unit of multiple Anti-thefts passes through monitor terminal module
The real time monitoring, it can be achieved that multiple set objectives is held, so that the networking for the video surveillance network of high confidentiality provides possibility.
It is discussed in detail although the contents of the present invention have passed through above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read above content, for of the invention
A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (10)
1. a kind of video monitoring system of high confidentiality, which is characterized in that the system includes: several Anti-theft video signal communications
Unit and monitor terminal module (34)；Wherein, each Anti-theft video signal communication unit includes: video signal collection encryption mould
Block, video signal decoding module；
In the video signal decoding module, the light of driving laser (30) transmitting is through double optical feedback return circuits, optoisolator
(19), after fiber amplifier (18), fiber coupler FC2 (17), enter the video signal collection encrypting module all the way, separately
Enter balanced detector (31) through the second response laser (14) all the way, second response laser (14) is anti-through double light by injection
It is fed back to the chaotic signal of road output inhibited with delay characteristics, obtains delay characteristics further repressed Chaotic Wideband Signal
One, the Chaotic Wideband Signal one is for being decrypted the vision signal of encryption；Wherein, double optical feedback return circuits include
The difference of one external cavity feedback ring and the second external cavity feedback ring, the time delay of two external cavity feedback rings is relaxed equal to the driving laser (30)
The half of Henan duration of oscillation, the chaotic signal inhibited by double optical feedback return circuit output delay characteristics；
In the video signal collection encrypting module, optical signal is input to vision signal through the video signal decoding module
The first response laser (5) of encrypting module is acquired, the vision signal after the first delay line (3) with IP Camera acquisition adds
It is loaded in together in the balanced detector (31) of encrypted transmission to the video signal decoding module；Wherein, first response
The chaotic signal inhibited with delay characteristics that laser (5) is exported by injection through double optical feedback return circuits, obtain delay characteristics into
The repressed Chaotic Wideband Signal two of one step, the Chaotic Wideband Signal two is for encrypting vision signal；
Second response laser (14) and the first response laser (5) generate respectively achievable high quality Chaotic Synchronous,
The repressed Chaotic Wideband Signal one of delay characteristics and Chaotic Wideband Signal two pass through delay to two signals, power and partially
It is whole to transmit a signal to the monitoring for the adjusting of polarization state, the exportable decoded vision signal of balanced detector (31)
End module (34).
2. the video monitoring system of high confidentiality according to claim 1, which is characterized in that double optical feedback return circuits
It include: circulator (20), fiber coupler FC4 (21), fiber coupler FC3 (22), the second delay line (23), Polarization Controller
PC1 (24), adjustable attenuator VA1 (25), Polarization Controller PC2 (26), adjustable attenuator VA2 (27), fiber coupler FC5
(28)；
The light of driving laser (30) transmitting is through circulator (20), fiber coupler FC4 (21), fiber coupler FC3
(22) after, a part is transmitted to optical fiber through the second delay line (23), Polarization Controller PC1 (24) and adjustable attenuator VA1 (25)
Coupler FC5 (28) feeds back to driving laser (30) after circulator (20) and forms the first external cavity feedback ring；Another part warp
Polarization Controller PC2 (26) and adjustable attenuator VA2 (27) are transmitted to fiber coupler FC5 (28), anti-after circulator (20)
It is fed back to driving laser (30), forms the second external cavity feedback ring.
3. the video monitoring system of high confidentiality according to claim 2, which is characterized in that the fiber coupler FC4
(21) splitting ratio is 2:8, the fiber coupler FC2 (17), fiber coupler FC5 (28) and fiber coupler FC3 (22)
Splitting ratio be 5:5；After the fiber coupler FC4 (21), 80% partial light transmission to the fiber coupler
FC3(22)。
4. the video monitoring system of high confidentiality according to claim 2, which is characterized in that in the vision signal solution
In code module, the chaotic signal that the delay characteristics that driving laser (30) obtains inhibit is fed back to through the circulator (20) and is passed through again
After optical isolation (19), fiber amplifier (18), fiber coupler FC2 (17), a part enters Polarization Controller PC3 (7), adjustable
After attenuator VA3 (6), it is transmitted to the first response laser (5)；
Another part is transmitted to the second response laser (14) through Polarization Controller PC4 (16), adjustable attenuator VA4 (15).
5. the video monitoring system of high confidentiality according to claim 4, which is characterized in that the second response laser
(14) the repressed Chaotic Wideband Signal of delay characteristics generated is once the adjustable attenuator VA5 in video signal decoding module
(11), Polarization Controller PC5 (12) is transmitted to the balanced detector (31)；What first response laser (5) generated
The repressed Chaotic Wideband Signal two of delay characteristics is through adjustable in fiber coupler FC1 (8) and video signal decoding module
Attenuator VA6 (9) and Polarization Controller PC6 (10) is transmitted to the balanced detector (31).
6. the video monitoring system of high confidentiality according to claim 1, which is characterized in that the first response laser
(5) it is electrically connected with first laser device controller (4)；Second response laser (14) and second laser controller (13) electricity
Connection；The driving laser (30) is electrically connected with third laser controller (29).
7. the video monitoring system of high confidentiality according to claim 1, which is characterized in that the fiber amplifier (18)
For EDFA Erbium-Doped Fiber Amplifier.
8. the video monitoring system of high confidentiality according to claim 1, which is characterized in that the driving laser
(30), the first response laser (5), the second operation wavelength for responding laser (14) are 1550nm.
9. the video monitoring system of high confidentiality according to claim 1, which is characterized in that the monitor terminal module
(34) angle and focal length of each IP Camera can be adjusted according to the actual situation.
10. the video monitoring system of high confidentiality according to claim 1, which is characterized in that the balanced detector
(31) decoded vision signal is transmitted to the monitor terminal module through data conversion module (32), router (33)
(34)；Decoded vision signal is converted into meeting the vision signal of RJ45 transmission by the data conversion module (32).
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