CN107566804A - A kind of underwater video and data transmission system based on optical fiber - Google Patents
A kind of underwater video and data transmission system based on optical fiber Download PDFInfo
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- CN107566804A CN107566804A CN201710894489.5A CN201710894489A CN107566804A CN 107566804 A CN107566804 A CN 107566804A CN 201710894489 A CN201710894489 A CN 201710894489A CN 107566804 A CN107566804 A CN 107566804A
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Abstract
The invention discloses a kind of underwater video and data transmission system based on optical fiber, the wherein system includes:Optical fiber telecommunications system, the underwater three parts such as embedded acquisition control system and deck monitoring interface composition.Optical fiber telecommunications system is divided into underwater and two parts of deck fiber optic telecommunications module, and it provides the real-time monitoring of two-path video image, and provides transparent data passage for underwater embedded acquisition control system and deck monitoring interface.Underwater embedded acquisition control system beats Jian according to descending underwater installation control command or closes the underwater installations such as Underwater Camera, illuminating lamp and altimeter, the status information such as timing acquiring system voltage and towed body posture is also wanted, and they are transmitted and gives deck monitoring interface.Deck monitoring interface realizes the functions such as the real-time display of two-path video image and monitoring data, the transmission of underwater installation control command, the storage and playback of video.The real-time video monitoring of deep-sea resources exploration and development process can be realized by the system, correctly to quickly finish underwater operation.
Description
Technical field
The present invention relates to fiber optic communication field, particularly one kind to be based on Underwater Optical Fiber video and data transmission system.
Background technology
Contain substantial amounts of precious resources in ocean.But because of the particularity of its environment, how accurately and quickly to explore and open
Marine resources are sent out, are a difficult problem of the pendulum in face of countries in the world, it has become the national quick, weight of sustainable development of restriction
Want factor.Therefore, Development of Marine science and technology, especially ocean new and high technology have turned into the important content of new worldwide technological revolution.With
The exploration and exploitation of land resources are different, and in the exploration and development process of marine resources, people cannot be directly viewed entirely mistake
The real-time pictures situation of journey, it is necessary to monitored in real time come the progress to underwater site environment by deep sea camera system, so as to just
Really, other deep-sea scientific investigation equipment are rapidly manipulated.
In recent years, China's seafari and development technique achieve rapid development, are also included in investigating equipment at deep-sea
Deep sea camera system.The transmission cable that these systems mainly use mainly has armored coaxial cable and the pin dress with dynamic transmission
Composite cable.Armored coaxial cable is widely used in deep-sea expedition and sampling equipment due to simple to operate, easy to maintain.Coaxially
Cable narrow bandwidth, data transmission bauds is slow, and signal attenuation is big, and frequency distortion degree is high；Coaxial cable is more thin longer, loss
Will be bigger；Signal frequency is higher, and loss also can be bigger；And cable is longer, " side frequency difference " is also bigger, coaxial cable
This " frequency distortion characteristic ", be to influence the most key factor of video image quality.Therefore when deep-sea picture pick-up device is taken
After the Underwater Camera number more than two of load, to ensure that communication is smooth, the vision signal transmitted has to pass through compressed encoding,
Video quality after recovery is by degradation, it is difficult to meets the requirement of video monitoring.It can be seen that because armored coaxial cable itself is special
The limitation of property so that based on the deep sea camera system of armored coaxial cable many occasions using when be restricted.The present invention adopts
Solved the above problems by the use of armouring composite cable as video image and the transmission medium of data.Compared with coaxial cable, optical fiber
The fairly obvious optical fiber attenuation of advantage it is very low, and can consistently pass through broader frequency range.Next, and the one of most critical
Point, fibre system will not be disturbed by external electromagnetic field.Although armouring composite cable price is higher, it is acted on greatly, in cable
Spcific power cable can easily realize tens kilowatts of energy sources.In addition, armouring composite cable be ocean engineering application in compared with
More composite ropes, technology are ripe already.
The content of the invention
The present invention solves the technical problem of provide a kind of underwater HD video and video big data based on optical fiber
Data transmission system is measured, video definition is improved, can effectively lift deep-sea detecting efficiency.
In order to solve the above technical problems, one aspect of the present invention is：By using myriametre armouring complex light
Cable is the underwater video and data transmission system that transmission medium is formed.
Wherein, the underwater video system based on armouring composite fiber, including：Wherein, myriametre armouring composite cable is again
Referred to as optoelectronic composite cable, its center are a copper cables, and mutually redundant double optical cable units are placed on wrapped outside copper cable
In private school layer.The energy is transmitted by center copper cable, and up vision signal, sensor status data frame and under
Capable underwater installation control command is by optical cable transmission.Deck system mainly be responsible for deck power supply HVDC conversion,
The reception and display of up video image and sensor status data frame, the transmission of downstream plant control command etc., by its function
Also further module deck policer operation platform, power conversion processing module, deck fiber optic telecommunications module and video can be turned to
Server.
Wherein, the deep-sea System Working Principle, including:After system electrification, start monitoring circle on the monitor supervision platform of deck
Face, send descending underwater installation control command；Equipment control command enters deck fiber optic telecommunications module, mould through RS232 serial ports
Order (electric signal) now can be converted into optical signal by block, then pass through optical cable transmission to underwater optical fibre communication module；Under water
Order first can be carried out opto-electronic conversion by fiber optic telecommunications module, then be sent to underwater embedded acquisition control system by serial ports；Adopt
Collect control system according to i.e. fixed communication protocol, resolve command, and perform opening with closing video camera, illuminating lamp and altimeter etc.
Water
The task of lower equipment；When video camera and after be opened from bottom altimeter, video camera output analog video signal is directly carried out
Enter underwater optical fibre communication module, and from system state datas such as bottom altimeter and obliquity sensors by underwater embedded acquisition control
System acquisition is simultaneously packaged into after data incline, then sends underwater optical fibre communication module to, and video and data are inclined with time-multiplexed side
Formula, deck fiber optic telecommunications module is passed to by optical cable；Deck fiber optic telecommunications module taps row video and data, video letter
Number export to video server, and data frame is then directly transmitted to deck monitoring interface by serial ports, data frame is after parsing, system
State parameter is shown in the corresponding region in interface；When deck, monitoring interface opens video monitoring function, and deck monitoring interface is just
Video server can be accessed, obtains and shows two-path video image；When needing store video images, Jian opens video recording store function
；, can be to play back the video image of all storages after stopping video monitoring.
Wherein, the conceptual design of the deep-sea video monitoring three digest journals, including:The similar numeral of optical fiber telecommunications system function
Optical transmitter and receiver, it is only necessary to the transmission work of video image and data is completed, from CPLD as underwater and deck fiber optic telecommunications module
Main control chip.
Wherein, the fibre-optic transmission system (FOTS) is that various information are transmitted in a manner of serial serial data stream.Therefore, in water
In lower fiber optic telecommunications module, it is necessary to first enter to data before parallel video and data message are sent into electrooptical device
Row parallel-serial conversion.Equally, in the fiber optic telecommunications module of deck, after opto-electronic conversion is completed to high-speed serial data, it is necessary to first
The parallel data for being reduced into serial data with serioparallel exchange chip, it then can just give CPLD and carry out tap processing.The present invention
That selects is string and is the SN65LV1023A and SN65LV1224B of TI companies respectively with parallel-serial conversion chip.It is all 10
Deserializer, working frequency are 10 ~ 66MHz.SN65LV1023A chips can restore in highspeed serial data stream when
Clock, the clock is extremely important, synchronous for the clock between the module of optical fiber telecommunications system two.In addition, it also has one synchronously to carry
Show pin, after the clock synchronization on module both sides, it can export low level, very convenient debugging.In view of system context
Particularity, in being designed, optical fiber telecommunications system employs two optical fiber simultaneous transmission identical video datas, sensor shapes
State data and descending equipment control command, two optical fiber backup each other.
Wherein, underwater embedded acquisition control system conceptual design, including：Perform and open with closing Underwater Camera, shining
The mission critical of the underwater installation such as bright lamp and altimeter, he will also complete the parsing of downstream plant control command, timing acquiring and
The tasks such as sensor status data are sent, underwater embedded acquisition control system is completed these tasks very well, it is necessary to select
One suitable embeded processor.In control field, microcontroller is main flow, and therefore, the present invention selects embedded micro-control
Processor of the device processed as underwater embedded acquisition control system.
Wherein, the deck monitoring interface conceptual design, including:The monitoring interface of deck monitor supervision platform will show that two-way regards
Frequency image, reception simultaneously show the sensor status data frame transmitted from deck fiber optic telecommunications module, send descending underwater installation
Control command, some operational configurations for showing ship（The speed of a ship or plane and through forbidden word degree etc.）.It can generally be divided into following four area：Video shows
Show area, parameter display area, underwater installation control zone and video control zone.
Brief description of the drawings
Fig. 1 is present system hardware connection diagram；
Fig. 2 is underwater optical fibre communication module Design of CRT Video Processing Circuit of the present invention；
Fig. 3 is underwater embedded acquisition control system integral layout figure of the invention；
Fig. 4 is fiber optic telecommunications module Design of CRT Video Processing Circuit figure in deck of the present invention；
Fig. 5 is D/A change-over circuits of the present invention；
Fig. 6 is amplification circuit diagram of video of the present invention；
Fig. 7 is underwater embedded primary control program flow chart of the invention；
Fig. 8 is communication protocol design instruction code brief introduction figure of the present invention.
Embodiment
In describing below, in order to illustrate rather than in order to limit, it is proposed that such as particular system structure, interface, technology etc
Detail, thoroughly to understand the application.However, it will be clear to one skilled in the art that in these no details
Other embodiment in can also realize the application.In other situations, omit to well-known device, circuit and side
The detailed description of method, in case unnecessary details hinders the description of the present application.
Referring to Fig. 1, present system hardware connection diagram, this method include：
Hardware design mainly includes optical fiber telecommunications system and underwater embedded acquisition control system, and the former is by deck fiber optic communication mould
Block and underwater optical fibre communication module composition.The collection and transmission of the main completion video image of fiber communication system, it is also underwater
Communication between embedded acquisition control system and deck monitoring interface provides transparent data passage.Underwater embedded acquisition control
The sensor status data that timing collects will can just pass to deck monitor supervision platform by optical fiber telecommunications system.Equally, first
The underwater installation control command that board monitoring interface is sent will also get to underwater embedded collection control by optical fiber telecommunications system
System processed.
Fig. 2 is underwater optical fibre communication module Design of CRT Video Processing Circuit, and the analog video signal of Underwater Camera output will
By the processing of video processing circuits, it can just give and carry out multiple connection processing.Video processing circuit is by match circuit, clamper electricity
Road, low-pass filter circuit and change-over circuit composition.Wherein impedance matching is only needed behind the interface of access analog video signal
The resistance of one is connect over the ground, and it can play a part of absorption signal, not produce any reflection.Wherein, video amplifier circuit
The analog video signal maximum of Underwater Camera output be 1Vpp, video processing circuits needs are first put to input signal
Greatly, make the input voltage range of A/D converter selected by the voltage magnitude satisfaction of input signal, and should try one's best close to its full amount
Journey, to improve the precision of A/D conversions.The amplifier selected herein is the high broadband operational amplifier of company, model
EL5166, it is a Current feedback amplifier, has preferable performance, as gain be 1 Time Bandwidth can reach 1.4GHz, turn
Throw-over rate is 600v/ μ s, and this makes it can be used for high-speed video amplification.Wherein, the pal video letter of video clamping circuit
Number frequency band from " zero-frequency " to 6MHz, wherein " zero-frequency " represents slowly varying part in picture signal, its signal properties connect
It is bordering on direct current.Zero-frequency being close to if the progressive formation of image background brightness to be transmitted.Therefore, in order to transmit this " zero
Frequently signal ", it is necessary to using dc amplifier.But because more stages of high gain amplifier easily causes level-shift, so actual should
Still using handing over stream Said to close amplifier in, this will cause DC component quilt " blocking ", most make the mean flow rate of row image at last
Change.Fixed blanking level and unipolarity change, and fixed row, field have been used when the present invention solves the above problems
Cycle, and the blanking level for the video signal for losing average weight is clamped down on same fixed level, thus may be used
To recover DC component.Wherein, treated analog video signal is converted into digital video letter by video a/d change-over circuit
Number.AD9280 has multiple-working mode, and specific mode of operation can be selected by the external circuitses of chip pin.
Fig. 3 is underwater embedded acquisition control system integral layout, and underwater embedded acquisition control system is with C8051F020
For main control chip, by I/O plus relay drive circuit come control relay, and then underwater camera, illuminating lamp, height are controlled
The switch of the equipment such as meter；By the output voltage for carrying ADC acquisition systems input voltage and obliquity sensor；By carry two
Road UART is communicated with the altimeter with RS-232 interface and underwater optical fibre communication module.In view of underwater embedded collection control
The scalability of systemic-function processed, in hardware design, the internal resource of handle has been drawn out by binding post as much as possible.
Fig. 4 is deck fiber optic telecommunications module Design of CRT Video Processing Circuit, deck optical fiber telecommunications system video processing circuits master
If analog video signal will be converted into from obtained digital video signal, video server is given after enhanced processing.Depending on
Frequency process circuit includes change-over circuit, amplifying circuit of video, low-pass filter circuit, the secondary amplifying circuit of video.Wherein, D/
A change-over circuits are using DAC908E, and he is 8 parallel-by-bit high-speed A/D converters of a low-power consumption, difference current output,
Maximum slew rate is up to 165MSPS, and single-ended power voltage is 3V or 5V.From the 8 digital video data signals warp of CPLD outputs
After DAC908E is converted into difference current, video amplifier circuit below is given.Wherein, a video amplifying circuit such as Fig. 6 institutes
Show, the amplifying circuit is the Voltage Feedback operational amplifier of a high speed using EL5104.5V or positive and negative 5V can be used
Power supply is powered, and Slew Rate is 700v/ μ s, output current 160mA.It receives the difference current from the output of D/A change-over circuits, defeated
Go out analog video signal.Wherein, LPF is after EL5104 processing, it should carries out low pass filtered to vision signal first
Ripple, then just carry out secondary amplification.The secondary amplifying circuit of video is using above used EL5166 as the secondary amplification electricity of video
The operational amplifier on road.
Fig. 7 is underwater embedded primary control program flow chart, under water in embedded acquisition control system, main control chip
C8051F020 is the most key part, it to complete the data acquisition of monitoring system, the parsing of downstream plant control command,
The functions such as the data message that the control and upload of underwater installation collect.Therefore, C8051F020 programming includes：System
The initialization of system, the parsing of downstream plant control command and execution, sensor and other upstream datas collection with send and
Interrupt service routine.After system electrification, main control chip C8051F020 will carry out reset operation automatically.Program starts normally to transport
Before row, it is necessary to which closing, which is seen, doorway and to be forbidden interrupting, and mistake occurs during preventing subsequent operation.Then program will be initialized
Operation, such as timer initialization, initialization of (a) serial ports etc..Then Jian opens house dog, enabled interruption and opening timing device, is followed into master
Ring.During each run major cycle, dog feeding operation will be carried out, anti-locking system automatically resets.Afterwards, data are read from serial ports, such as
Fruit receives complete command frame, then it is parsed, then performs associative operation.If timer then, reads sensor
With other system state datas, and sent after they are packaged into data frame.System initialization is in order that program can be transported normally
Software for Design part necessary to row, is mainly included the following steps that：Clock initializes.Clock selecting can be to other initial configurations
Have a certain impact, it is necessary to first configure main control chip C8051F020 system clock before other initialization, intersection is opened
Close initialization.The external pin function of C8051F series monolithics needs to enable by configuring intersection Jian pass pin Come.House dog
Initialization.In order that system is relatively reliable, it is necessary to interrupted using house dog, therefore, it is necessary to initialized to it, and will be also
Often carry out dog feeding operation.Interrupt initialization.Complete the setting of interrupt source and interrupt priority level etc..
UART is initialized.Including working method, baud rate selection and the setting of respective interrupt.Timer initializes.Bag
Include determine working method, when device clock and count initial value setting.ADC is initialized.Worked including Multipexer selector, ADC
The setting of mode, programmable amplifier gain, alignment of data mode etc..
Fig. 8 is communication protocol design instruction code brief introduction, the monitoring interface of board monitoring platform and underwater embedded acquisition control
, it is necessary to formulate the communication of mutual concession when system communicates
Agreement, so make to be operated according to the requirement of other side each other.In Software for Design, the communication protocol used includes：Under
Capable equipment control command agreement and up sensor status data Frame Protocol.In order to realize the backward compatibility of software,
When designing frame format, the function that C8051F020 can be utilized to realize all has been covered in data frame.
Embodiments of the present invention are the foregoing is only, are not intended to limit the scope of the invention, it is every to utilize this
The equivalent structure or equivalent flow conversion that description of the invention and accompanying drawing content are made, or directly or indirectly it is used in other correlations
Technical field, it is included within the scope of the present invention.
Claims (6)
1. a kind of underwater video and data transmission system based on optical fiber, the composition and opto-electronic conversion of optical fibre control system, signal
Transmission, it is characterised in that including：
Optical fibre control system is made up of 5 parts, including：Electric terminal, optical transmitter, optical fiber cable, optical repeater and photoreceiver
Composition；
Electric terminal performs general telecommunication function, including but not limited to A/D conversion, multiplexing processing；
The function of optical transmitter is that the electric signal of input is converted to optical signal, and with affinity technology optical signal to greatest extent
Injection fibre circuit；
Optical transmitter converts electrical signals into the process of optical signal（It is often simply called electric light or conversion）It is to light by electric signal
Modulate and realize；
For optical fiber cable as circuit, its function is with distortion as small as possible the optical signal from optical transmitter（Distortion）With decline
Subtract and be transferred to photoreceiver；
Optical fiber is the main body of fibre circuit, and joint and connector are indispensable devices, and receiving is used in Practical Project
Perhaps the optical cable of multifiber；
In long-distance optical fiber communication system, optical repeater passes through the faint optical signal after long-distance optical fiber is decayed and is distorted
Amplification, shaping, the optical signal for regenerating some strength, continue to be sent to front to ensure good communication quality；
The function of photoreceiver is that the faint optical signal that distortion and decay are exported, produced from fibre circuit is converted into electric signal,
And the electric signal before transmitting is reverted to after amplification and processing；
Photoreceiver is made up of photodetector, amplifier and interlock circuit.
2. according to the method for claim 1, it is characterised in that the transmission of the fiber optic communication vision signal and composition, bag
Include：The picture point of multiple finite element sizes may make up piece image, and picture point is to form the elementary cell of piece image；In image transmitting
When, the picture is scanned, electric signal is converted into and then is transmitted；In image transmitting, it is necessary to it is rapid and accurate, often
One picture point just sends and receives when only taking turns to his transmission, and referred to as Transmitting and Receiving End works asynchronously；In the communication system, insert
Synchronizing signal is entered and has realized that transmitting-receiving is synchronous.
3. according to the method for claim 2, underwater embedded acquisition control system hardware design, it is characterised in that with
C8051F020 is main control chip, by I/O plus relay drive circuit come control relay；In view of underwater embedded collection
The scalability of control system function, in hardware design, C8051F020 internal resource is passed through binding post as much as possible
Extract.
4. according to the method for claim 3, it is characterised in that deck fiber optic telecommunications module Design of CRT Video Processing Circuit, first
Plate optical fiber telecommunications system video processing circuits mainly will be converted into analog video signal from obtained digital video signal, pass through
Video server is given after enhanced processing；Video processing circuits includes change-over circuit, amplifying circuit of video, LPF electricity
Road, the secondary amplifying circuit of video.
5. according to the method for claim 4, the last deck monitoring interface conceptual design of part, it is characterised in that
Deck monitor supervision platform will be connected with three parts：First, deck fiber optic telecommunications module；Second, video server；Third, ship island
Operational configuration system, the system provide interface.
6. according to the method for claim 5, software component elements in systems, it is characterised in that including:It is embedding under water
Enter in formula acquisition control system, main control chip C8051F020 is major part, and C8051F020 programming includes, system
Initialization, the collection of parsing Yu the execution, sensor and its upstream data of downstream plant control command take with sending and interrupting
Business program；Underwater optical fibre communication module program to complete the collection of video image, the multiple connection of multiple paths of video images and data frame,
The function such as 8B/10B codings and manchester decoder；Deck fiber optic telecommunications module program completes the recovery of video image, multichannel regards
The tap of frequency image and data frame, 8B/10B decodings and Manchester's code etc., in addition, program must also realize that double-fiber redundancy is standby
The function of part.
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| CN201710894489.5A CN107566804A (en) | 2017-09-28 | 2017-09-28 | A kind of underwater video and data transmission system based on optical fiber |
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| CN201710894489.5A CN107566804A (en) | 2017-09-28 | 2017-09-28 | A kind of underwater video and data transmission system based on optical fiber |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109617606A (en) * | 2018-12-18 | 2019-04-12 | 林育东 | A kind of optical fiber bidirectional Transmission system adapting to marine environment |
| CN109818676A (en) * | 2019-03-12 | 2019-05-28 | 武汉理工大学 | It is a kind of suitable for multi-environment signal collecting device |
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| CN103188479A (en) * | 2011-12-27 | 2013-07-03 | 中国航天科工集团第二研究院七〇六所 | Video monitoring system and video monitoring method based on optical fiber interface |
| CN203522925U (en) * | 2013-08-27 | 2014-04-02 | 杭州电子科技大学 | Deep-sea high-definition video acquisition control system |
| CN105430351A (en) * | 2015-12-23 | 2016-03-23 | 国家***第一海洋研究所 | Underwater high-definition data transmission system |
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2017
- 2017-09-28 CN CN201710894489.5A patent/CN107566804A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103188479A (en) * | 2011-12-27 | 2013-07-03 | 中国航天科工集团第二研究院七〇六所 | Video monitoring system and video monitoring method based on optical fiber interface |
| CN203522925U (en) * | 2013-08-27 | 2014-04-02 | 杭州电子科技大学 | Deep-sea high-definition video acquisition control system |
| CN105430351A (en) * | 2015-12-23 | 2016-03-23 | 国家***第一海洋研究所 | Underwater high-definition data transmission system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109617606A (en) * | 2018-12-18 | 2019-04-12 | 林育东 | A kind of optical fiber bidirectional Transmission system adapting to marine environment |
| CN109818676A (en) * | 2019-03-12 | 2019-05-28 | 武汉理工大学 | It is a kind of suitable for multi-environment signal collecting device |
| CN109818676B (en) * | 2019-03-12 | 2021-11-23 | 武汉理工大学 | Signal acquisition equipment suitable for many environments |
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Application publication date: 20180109 |