CN110138457A - Has the underwater visible light communication system of condition monitoring and operating condition adaptively - Google Patents
Has the underwater visible light communication system of condition monitoring and operating condition adaptively Download PDFInfo
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- CN110138457A CN110138457A CN201910282601.9A CN201910282601A CN110138457A CN 110138457 A CN110138457 A CN 110138457A CN 201910282601 A CN201910282601 A CN 201910282601A CN 110138457 A CN110138457 A CN 110138457A
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- G—PHYSICS
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- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
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Abstract
The invention discloses have the underwater visible light communication system of condition monitoring and operating condition adaptively, including being sequentially connected the computing device connect, ethernet module and optical modem, optical modem is connected by cable with optical receiver assembly and optical launcher, wherein: light sensitive diode detects the illuminance that optical launcher issues, and then calls the operating current and illuminance of control algolithm adjusting optical launcher；Temperature-detecting device detects the internal temperature of optical receiver assembly, and then adjusts the driving voltage and gain amplifier of photodiode；Optical modem illuminance, the practical bit error rate and transmission delay based on the received, automatically adjust its transmission speed.By above-mentioned measure, real-time monitoring working condition and adjust automatically operating current, driving voltage are reached, it is ensured that device works in linear zone and optimizes the technical purpose of data transmission bauds.
Description
Technical field
The present invention relates to technical field of visible light communication, more particularly, to having condition monitoring and the adaptive water of operating condition
Lower visible light communication system.
Background technique
Currently, the mode for subsurface communication has two kinds of wire communication and wireless communication.Cable communicating technology is mainly applied
Communication between submarine navigation device and manipulation lash ship, it is by laying conducting wire or light between aircraft under water and manipulation lash ship
Cable establishes communication loop between the two, carries out reliable two-way communication, to realize the real-time Transmission of remote control, telemetry intelligence (TELINT).Due to
It needs to be laid with optical cable or conducting wire under water, when underwater detection equipment is mobile, the flexibility of equipment can be restricted.In addition, with
Equipment spacing from increase, the cost of optical cable or conducting wire increases, is also not easy to carry on small device under water.With cable modem
Letter mode is compared, and wireless communication is more suitable for underwater operation.
In recent years, underwater robot technology was quickly grown, and popularized it in the use in the fields such as hydrospace detection, its energy
Enough navigation under water and the specific functions such as complete independently monitoring and collection information.Underwater robot is generally divided into two kinds: remote control machine
Device people (Remotely Operated Vehicle, abbreviation ROV) and autonomous type underwater robot (Autonomous
Underwater Vehicle, abbreviation AUV).ROV has cable, provides power by lash ship and carries out manual control, but by
The restriction of cable lacks flexibility.AUV is a kind of untethered, Intelligent Underwater Robot, its included energy, by airborne centre
Reason device (Central Processing Unit, abbreviation CPU) carries out processing decision, and complete independently includes positioning, information collection etc.
Various operations, to complete the mission of mankind's imparting, it represents the developing direction of underwater robot.The shortcoming of AUV be by
It is limited to energy resource supply problem, and CPU processing capacity is limited, so some short distances, uncomplicated work can only be responsible for.Above-mentioned
In the application process of ocean observation technology, the either observation real-time Transmission of data or assigning for control instruction is required full
The support of the underwater wireless communication technology of sufficient transmission requirement.
Underwater visible light communication technology is a kind of emerging underwater wireless communication technology, it is in marine environmental monitoring and ocean
Military affairs etc. are played the role of vital.Visible wavelength range is 380nm ~ 780nm, and frequency of light wave is high, can be carried
Ability is strong, can be realized large-capacity data transmission；Light is influenced smaller, strong antijamming capability by temperature and salinity in the seawater；
The spread speed of light in water is about 3/4 of spread speed in vacuum, and propagation delay time is small；Light wave has good directionality, when
When optical signal is intercepted by third party, reception can find communication link fails in time, be easy to maintain secrecy；Optical wavelength is shorter, so
Dual-mode antenna is short, volume miniaturization.It is serious that it overcomes electromagnetic wave transmission attenuation in ocean；Sonic transmissions time delay is big, rate
The disadvantages of low, narrow bandwidth, safety poor, vulnerable to underwater environment influence.
Although existing Chinese patent CN105572807B, a kind of optical communication interface device of underwater wet plug and its optic communication
Method discloses the light source drawn in optical fiber using special optical device, logical using existing more mature underwater wireless light
The target that letter technology completes the docking of optical fiber interface, optical communication link is established, converts complicated submarine mechanical operating process to
It is relatively easy to the wireless light communication process realized under water, greatlys improve working efficiency, improves reliability, while also solving and working as
The preceding underwater wet plug problem that the fiber optic data communication interface service life is short, manufacturing cost is high, provides one kind for submarine optical communication and compares
More simple, convenient, the reliable method of traditional underwater wet connecting-disconnecting interface.
Existing Chinese patent CN201610887844.1, underwater LED radio optical communication system based on light application time and its
Using the emission system for disclosing underwater LED radio optical communication system includes the driving circuit of LED light, LED light, and can
Control the controller module of LED light opening and closing and luminous duration；The controller module of the emission system is available to pass through existing electronics control
Technology processed voluntarily builds the controller of example, in hardware, and the embedded software that also can use smart phone realizes software function module control
The mode of system, to conveniently realize underwater laser communication.
But it causes to send out since power attenuation is serious on light transceiver path in current underwater visible light communication field
It is larger to penetrate power, transceiving device easily enter saturation region, loss transmission rate and increase transmission delay the problem of, especially in temperature
The job stability for rising communication system in the case where fluctuating is a research topic.
Summary of the invention
In order to overcome the above-mentioned deficiencies of the prior art, the present invention is intended to provide to have condition monitoring and operating condition adaptive
Underwater visible light communication system, including being sequentially connected the computing device connect, ethernet module and optical modem, light modulation solution
Device is adjusted to be connected by cable with optical receiver assembly and optical launcher, in which: light sensitive diode detects optical emitting dress
The illuminance of sending is set, and then calls the operating current and illuminance of control algolithm adjusting optical launcher；Temperature detection dress
The internal temperature of detection optical receiver assembly is set, and then calls control algolithm to adjust the driving voltage of photodiode and amplify and increases
Benefit；Optical modem automatically adjusts its biography according to the received illuminance of optical receiver assembly, the practical bit error rate and transmission delay
Defeated speed.By above-mentioned measure, to reach temperature, voltage, electric current and the adjust automatically hair of real-time monitoring optical transmitting and receiving device
The driving voltage of the operating current of injection device, reception device, it is ensured that device work is in linear zone and optimizes data transmission bauds
Technical purpose.
For this purpose, the technical scheme adopted by the invention is that: have the underwater visible light of condition monitoring and operating condition adaptively
Communication system, including being sequentially connected the computing device connect, ethernet module and optical modem, the computing device is also connected with
There are other peripheral circuits, optical modem is connected by cable with optical receiver assembly and optical launcher, wherein its
His peripheral circuit includes temperature-detecting device, light sensitive diode, acoustic-optic alarm and cooling device.Wherein:
Light sensitive diode is connected with the LED light array in optical launcher, for detecting optical launcher sending
Illuminance, and then call the operating current and illuminance of control algolithm adjusting optical launcher；
Temperature-detecting device is connected with the photodiode in optical receiver assembly, for detecting the inside of optical receiver assembly
Temperature, and then call the driving voltage and gain amplifier of control algolithm adjusting photodiode；
Optical modem automatically adjusts it according to the received illuminance of optical receiver assembly, the practical bit error rate and transmission delay
Transmission speed.
It further, include being sequentially connected the D/A conversion circuit connect, LED modulation driving inside the optical launcher
Circuit and LED light array, LED modulation drive circuit are also connected with current measuring device, in which: the D/A conversion circuit with
Optical modem is connected, and LED modulation drive circuit and light sensitive diode have cable connection, and light sensitive diode is installed on
In the visual range of LED light array.
It further, include being sequentially connected the photodiode connect, differential amplifier circuit inside the optical receiver assembly
With A/D conversion circuit, the photodiode is also connected with photoelectricity flow measuring apparatus and photodiode drive module, and with it is outer
The temperature measuring device in portion is connected, and the A/D conversion circuit is connected with optical modem, the photodiode driving
Module is for voltage source needed for providing photodiode work.
More preferably, optical launcher has the ability of automatic adjustment illuminance, this regulation flow process are as follows: 1) light sensitive diode
The illumination of LED light array inside real-time detection optical launcher, and the illumination for the optical launcher that will test passes
Give LED modulation drive circuit；2) LED modulation drive circuit calls control according to the illumination detected and the difference of object illumination
Algorithm processed obtains and is adjusted to the operating current suitable for LED modulation drive circuit；3) work of LED modulation drive circuit
Electric current influences the illumination of LED light array output.
More preferably, optical receiver assembly has the ability for automatically adjusting its gain amplifier, regulation flow process are as follows: 1) temperature is examined
The internal temperature for surveying device real-time detection optical receiver assembly, the photodiode driving mould being transmitted to inside optical receiver assembly
Block；2) the received photoelectric current of photoelectricity flow measuring apparatus real-time detection optical receiver assembly institute, and it is transmitted to photodiode drive
Dynamic model block；3) photodiode drive module according to the internal temperature detected and receives photoelectric current, is calculated required
Target drives voltage, and adjust and arrive required target drives voltage；4) photodiode changes its amplification by driving voltage
Gain.
More preferably, optical modem has the ability of automatic adjustment transmission speed, regulation flow process are as follows: 1) light modulation solution
Device is adjusted to obtain rough Preset Transfer speed in conjunction with empirical value table according to the received illuminance of photodiode；2) light modulation solution
It adjusts device according to Preset Transfer speed, the practical bit error rate and transmission delay, obtains finer object transmission speed.
More preferably, optical receiver assembly has the ability of automatic calibration internal photo driving voltage, specific steps
Are as follows:
S1. computing device stops the data transmission procedure of optical launcher and optical receiver assembly；
S2. the driving voltage that optical receiver assembly is arranged is new numerical value；
S3. system optics structure is adjusted, optical receiver assembly is enabled to receive the luminous ray issued from optical launcher；
S4. the output illuminance for continuously changing optical launcher, keeps the photoelectricity flow measuring apparatus inside optical receiver assembly real-time
Measure photocurrent values；
S5. computing device judges whether optical receiver assembly is in linear zone, if being not at linear zone, repeats step
Otherwise S2-S5 executes step S6；
S6. terminate the automatic control of driving voltage, resume data transmission process；
Wherein: step S5 judges whether the method in linear zone are as follows: judges measured photocurrent values sequence and optical emitting
Exist between the output illuminance of device it is whether linearly related, if it is present showing that optical receiver assembly is in linear zone.
The invention has the following beneficial effects:
Firstly, visible light communication system of the present invention can detect internal temperature, transmitting illumination, receive illuminance and work
Electric current is conducive to real time monitoring and controls working state of system comprehensively；
Secondly, the illuminance that optical launcher of the invention can be issued by detection, and then control algolithm is called to adjust optics
The operating current and illuminance of emitter；Optical receiver assembly detects its internal temperature by temperature-detecting device, and then adjusts
The driving voltage and gain amplifier that photodiode is adjusted with control algolithm, so that it is guaranteed that optical transmitting and receiving part works in line always
Property area, be conducive to system the operation is stable and reduce transmission delay；
Third, system are prolonged by optical modem according to the received illuminance of optical receiver assembly, the practical bit error rate and transmission
Late, the data transmission bauds that target is fine-tuned based on the empirical value for receiving illuminance influence data transmission bauds, reaches transmission
The optimization of speed, the bit error rate and transmission delay.
Detailed description of the invention
Fig. 1 is the composed structure schematic diagram for having the underwater visible light communication system of condition monitoring and operating condition adaptively；
Fig. 2 is the composition knot for having other peripheral circuits of the underwater visible light communication system of condition monitoring and operating condition adaptively
Structure schematic diagram；
Fig. 3 is the composition knot for having the optical launcher of the underwater visible light communication system of condition monitoring and operating condition adaptively
Structure schematic diagram；
Fig. 4 is the composition knot for having the optical receiver assembly of the underwater visible light communication system of condition monitoring and operating condition adaptively
Structure schematic diagram；
Fig. 5 is the optical launcher automatic adjustment for having the underwater visible light communication system of condition monitoring and operating condition adaptively
The regulation flow process schematic diagram of illuminance；
Fig. 6 is the optical receiver assembly automatic adjustment for having the underwater visible light communication system of condition monitoring and operating condition adaptively
The regulation flow process schematic diagram of its gain amplifier；
Fig. 7 is the tune for having the automatic adjustment transmission speed of the underwater visible light communication system of condition monitoring and operating condition adaptively
Save flow diagram；
Fig. 8 is that have the underwater visible light communication system of condition monitoring and operating condition adaptively to calibrate internal photo automatically
The execution flow chart of driving voltage.
Specific embodiment
In order to deepen the understanding of the present invention, present invention will be further explained below with reference to the attached drawings and examples, the implementation
Example for explaining only the invention, does not constitute protection scope of the present invention and limits.
It is of the present invention to have the underwater visible light communication system of condition monitoring and operating condition adaptively, composed structure
As shown in Figure 1, including being sequentially connected the computing device 1, ethernet module 3 and optical modem 4 connect, the computing device 1
Other peripheral circuits 2 are also connected with, optical modem 4 is connected by cable with optical receiver assembly 5 and optical launcher 6
It connects.
Ethernet module 3 is usually the network adapter suitable for computer, is commonly called as network interface card, is responsible in calculator memory number
It is formatted according between Ethernet data bag, Ethernet data bag herein is specific to network layer (i.e. IP layers).Light tune
Modulator-demodulator 4 between Ethernet data bag format and digital baseband signal for mutually converting, between ethernet module 3
It is connected with cable network, inside has the function of synchronous carrier detect, data, automatic error-correcting and channel equalization；Underwater visible light
The Modulation Types of communication are digital modulation, generally use the Modern modulations mode such as QAM/OFDM.Optical launcher 5 will be for that will adjust
Digital baseband signal after system is transformed into space optical signal, and optical receiver assembly 6 obtains number for demodulating space optical signal
Baseband signal.
The composed structure of other peripheral circuits 2 is as described in Figure 2, including temperature-detecting device 201, light sensitive diode 202, sound
Light warning device 203 and cooling device 204.Wherein: optical launcher 6, light in 201 real-time detecting system of temperature-detecting device
The internal temperature for learning reception device 5, in this, as adjustment driving voltage, operating current or starting air-cooled/water cooling, sound-light alarm
Foundation.
The visible light communication system can detect internal temperature, transmitting illumination, receive illuminance and operating current, benefit
In real time monitoring and comprehensive control working state of system, there is stronger practical value.
In said structure: light sensitive diode 202 is connected with the LED light array 603 in optical launcher 6, uses
In the illuminance that detection optical launcher issues, consequently facilitating the work for calling control algolithm to adjust optical launcher 6 is electric
Stream and illuminance；Temperature-detecting device 201 is connected with the photodiode 501 in optical receiver assembly 5, for detecting optics
The internal temperature of reception device 5, consequently facilitating calling, control algolithm adjusts the driving voltage of photodiode 501 and amplification increases
Benefit.
Optical modem 4 is according to the received illuminance of optical receiver assembly 6, the practical bit error rate and transmission delay, automatically
Adjust its transmission speed.
Composed structure inside optical launcher 6 as shown in figure 3, include be sequentially connected the D/A conversion circuit 601 connect,
LED modulation drive circuit 602 and LED light array 603, LED modulation drive circuit 602 are also connected with current measuring device 604,
Wherein: the D/A conversion circuit 601 is connected with optical modem 4, LED modulation drive circuit 602 and light sensitive diode
202 have cable connection, and light sensitive diode 202 is installed in the visual range of LED light array 603.
Digital baseband signal from optical modem 4 is transformed into analog baseband signal, LED tune by D/A conversion circuit
Analog intermediate frequency electric signal for being transformed into the visible light signal for being used for communications by driving circuit 602 processed, due to underwater visible
Optical transport decaying is serious, causes its power consumption larger；LED light array 603 is used for optical link shaping, good to realize
Optically focused, homogenization and heat transfer；Current measuring device 604 is for finely measuring the electricity of 602 course of work of LED modulation drive circuit
Stream consumption, to monitor the real-time working condition of optical launcher 6.
Composed structure inside the optical receiver assembly is as shown in figure 4, include being sequentially connected the photodiode connect
501, differential amplifier circuit 503 and A/D conversion circuit 504, the photodiode 501 are also connected with photoelectricity flow measuring apparatus
502 and photodiode drive module 505, and be connected with external temperature measuring device 201, the A/D conversion circuit 501
It is connected with optical modem 4.Wherein: photodiode 501 has line with illuminance for receiving optical signal and being converted to
The analog electrical signal of sexual intercourse, photoelectricity flow measuring apparatus 502 is for measuring the received light signal strength of optical receiver assembly, light
Electric diode drive module 505 is used for for driving voltage source needed for providing photodiode work, differential amplifier circuit 503
Transmission interference and clean signal are filtered out, A/D conversion circuit 504 is used to analog electrical signal conversion exporting discrete sampled value sequence
Column, as digital baseband signal；This digital baseband signal can be passed to optical modem 4, detect through carrier wave, data are synchronous, certainly
Dynamic error correction and etc. obtain original network packet.Photodiode drive module 505 is for providing photodiode work
Required voltage source.
In a kind of more preferably embodiment, optical launcher has the ability of automatic adjustment illuminance, this regulation flow process
As shown in figure 5, detailed process are as follows:
1) illumination of light sensitive diode device real-time detection optical launcher inside LED light array, and will test
The illumination of optical launcher sends LED modulation drive circuit to；
2) LED modulation drive circuit calls control algolithm, obtains and adjust according to the illumination detected and the difference of object illumination
Section is extremely suitable for the operating current of LED modulation drive circuit；
3) operating current of LED modulation drive circuit influences the illumination of LED light array output.
Wherein: the data output that light sensitive diode device detects illumination is 4 ~ 20mA current signal, RS232 signal, CAN letter
Number and I2C signal in any one, LED modulation drive circuit automatically adjust operating current control algolithm be digital PID
Control algolithm, expression are similar to k1*P+k2*I+k3*D；It is continuously detected when LED modulation drive circuit passes through a period of time,
It was found that operating current output need to be increased after obtained practical illumination is lower than object illumination.
From fig. 5, it can be seen that environmental temperature variations play bad interference and make during operating current influences illuminance
With.Change operating current by measurement illuminance, with control algolithm, negative feedback loop is constituted, to the disturbing factor of temperature variation
It is offset and is inhibited, be conducive to improve photoemissive stability and improve visible light communication reliability, and ensure optical transmitting and receiving
Part always works in linear zone, reduces transmission error rates and delay.
In a kind of more preferably embodiment, optical receiver assembly has the ability for automatically adjusting its gain amplifier, adjusts
Process is as shown in fig. 6, detailed process are as follows:
1) internal temperature of temperature-detecting device real-time detection optical receiver assembly, the photoelectricity being transmitted to inside optical receiver assembly
Diode driving module；
2) the received photoelectric current of photoelectricity flow measuring apparatus real-time detection optical receiver assembly institute, and it is transmitted to photodiode drive
Dynamic model block；
3) photodiode drive module according to the internal temperature detected and receives photoelectric current, and required target is calculated
Driving voltage, and adjust and arrive required target drives voltage；
4) photodiode changes its gain amplifier by driving voltage.It is currently known the gain amplifier and its work of photodiode
Make temperature correlation, and optical receiver apparatus leaves linear zone, in saturation region or close to shutdown area, will all substantially reduce communication effect
Rate leads to communication mistake.Visible light communication process changes under water in order to make optical receiver assembly be in linear zone always
Its driving voltage is a kind of relatively simple method.The method is in empirical equation, root built in the calculating area of photoelectric diode device
According to the internal temperature and receiving end photoelectric current measured, required target drives voltage can be obtained, so that photodiode
It maintains the gain amplifier of consistency and is in linear work area always.
In a kind of more preferably embodiment, optical modem has the ability of automatic adjustment transmission speed, adjusts stream
Journey is as shown in fig. 7, detailed process are as follows:
1) optical modem obtains rough Preset Transfer in conjunction with empirical value table according to the received illuminance of photodiode
Speed；
2) optical modem obtains finer object transmission according to Preset Transfer speed, the practical bit error rate and transmission delay
Speed.
The received illuminance of photodiode can be calculated in real time during real time communication by computing device 1, different
Illuminance corresponds to different grades of rough transmission speed, thus can be in this warp built in the calculating area of optical modem and memory block
Test formula.The negative feedback mechanism of Preset Transfer speed, the practical bit error rate and transmission delay is added, may make the adjusting of transmission speed
It is more fine, accurate, the optimum proportioning of the transmission speed, the bit error rate and the network delay that are optimal: when the practical bit error rate and biography
When defeated delay increases, the transmission speed of setting need to be reduced；And when the practical bit error rate and smaller transmission delay, it is contemplated that setting
Higher transmission speed.Set transmission speed grade should refer to current illuminance numerical value, should not deviate too greatly, overall next
When saying that illuminance is weak, lower data transmission bauds should be set.
System is prolonged by optical modem according to the received illuminance of optical receiver assembly, the practical bit error rate and transmission
Late, the data transmission bauds that target is fine-tuned based on the empirical value for receiving illuminance influence data transmission bauds, thus reachable
To the optimization of transmission speed, the bit error rate and transmission delay.
In a kind of more preferably embodiment, optical receiver assembly has automatic calibration internal photo driving voltage
Ability, the flow chart executed is as shown in figure 8, specific steps are as follows:
S1. computing device stops the data transmission procedure of optical launcher and optical receiver assembly；
S2. the driving voltage that optical receiver assembly is arranged is new numerical value；
S3. system optics structure is adjusted, optical receiver assembly is enabled to receive the luminous ray issued from optical launcher；
S4. the output illuminance for continuously changing optical launcher, keeps the photoelectricity flow measuring apparatus inside optical receiver assembly real-time
Measure photocurrent values；
S5. computing device judges whether optical receiver assembly is in linear zone, if being not at linear zone, repeats step
Otherwise S2-S5 executes step S6；
S6. terminate the automatic control of driving voltage, resume data transmission process.
In above-mentioned steps, need to make self-contained optical launcher and optical receiver assembly straight due to calibrating automatically
Letter is connected, the optic communication process with outside must be stopped first thus, such as step S1.It is continuous to change the defeated of optical launcher
Illumination out, need to occur communication protocol permission minimal illumination and highest illumination, observation whole process optical receiver assembly whether
Always linear zone is worked in；If do not worked in linear zone always, illustrate that this driving voltage of optical receiver assembly is improper, it is necessary to
It is adjusted.
The method by faster scan method judge rapidly current optical receiver apparatus driving voltage it is whether suitable, whether
Always linear zone is worked in, communication link failure is excluded, improves underwater visible light communication reliability with highly beneficial
Effect.
Wherein: step S5 judges whether the method in linear zone are as follows: the light measured by judging inside optical receiver assembly
Exist between electric current value sequence and the output illuminance value sequence of optical launcher and whether be linearly positively correlated, if it is present table
Bright optical receiver assembly is in linear zone.The output illuminance of optical launcher can pass through the detection knot of its internal light sensitive diode
Fruit obtains.
Judge the method for two value sequence linear correlations for linear regression analysis.
What the embodiment of the present invention was announced is preferred embodiment, and however, it is not limited to this, the ordinary skill people of this field
Member, easily according to above-described embodiment, understands spirit of the invention, and make different amplification and variation, but as long as not departing from this
The spirit of invention, all within the scope of the present invention.
Claims (7)
1. having the underwater visible light communication system of condition monitoring and operating condition adaptively, which is characterized in that including being sequentially connected
Computing device, ethernet module and the optical modem connect, the computing device are also connected with other peripheral circuits, light modulation
Demodulator is connected by cable with optical receiver assembly and optical launcher, other described peripheral circuits include temperature inspection
Survey device, light sensitive diode, acoustic-optic alarm and cooling device, in which:
Light sensitive diode is connected with the LED light array in optical launcher, for detecting optical launcher sending
Illuminance, and then call the operating current and illuminance of control algolithm adjusting optical launcher；
Temperature-detecting device is connected with the photodiode in optical receiver assembly, for detecting the inside of optical receiver assembly
Temperature, and then call the driving voltage and gain amplifier of control algolithm adjusting photodiode；
Optical modem automatically adjusts it according to the received illuminance of optical receiver assembly, the practical bit error rate and transmission delay
Transmission speed.
2. according to claim 1 have the underwater visible light communication system of condition monitoring and operating condition adaptively, spy
Sign is, includes being sequentially connected the D/A conversion circuit, LED modulation drive circuit and LED light connect inside the optical launcher
Array is learned, LED modulation drive circuit is also connected with current measuring device, in which: the D/A conversion circuit and optical modem
It is connected, LED modulation drive circuit and light sensitive diode have cable connection, and light sensitive diode is installed on LED light array
In visual range.
3. according to claim 1 have the underwater visible light communication system of condition monitoring and operating condition adaptively, spy
Sign is, includes being sequentially connected photodiode, differential amplifier circuit and A/D the conversion electricity connect inside the optical receiver assembly
Road, the photodiode is also connected with photoelectricity flow measuring apparatus and photodiode drive module, and surveys with external temperature
Amount device is connected, and the A/D conversion circuit is connected with optical modem, and the photodiode drive module is for mentioning
For voltage source needed for photodiode work.
4. according to claim 3 have the underwater visible light communication system of condition monitoring and operating condition adaptively, spy
Sign is that optical launcher has the ability of automatic adjustment illuminance, this regulation flow process are as follows:
1) illumination of light sensitive diode real-time detection optical launcher inside LED light array, and the optics that will test
The illumination of emitter sends LED modulation drive circuit to；
2) LED modulation drive circuit calls control algolithm, obtains and adjust according to the illumination detected and the difference of object illumination
Section is extremely suitable for the operating current of LED modulation drive circuit；
3) operating current of LED modulation drive circuit influences the illumination of LED light array output.
5. according to claim 4 have the underwater visible light communication system of condition monitoring and operating condition adaptively, spy
Sign is that optical receiver assembly has the ability for automatically adjusting its gain amplifier, regulation flow process are as follows:
1) internal temperature of temperature-detecting device real-time detection optical receiver assembly, and the internal temperature that will test is transmitted to
Photodiode drive module inside optical receiver assembly；
2) the received photoelectric current of photoelectricity flow measuring apparatus real-time detection optical receiver assembly institute, and it is transmitted to photodiode drive
Dynamic model block；
3) photodiode drive module according to the internal temperature detected and receives photoelectric current, and required target is calculated
Driving voltage, and adjust and arrive required target drives voltage；
4) photodiode changes its gain amplifier by driving voltage.
6. according to claim 5 have the underwater visible light communication system of condition monitoring and operating condition adaptively, spy
Sign is, optical modem has the ability of automatic adjustment transmission speed, regulation flow process are as follows: 1) optical modem according to
The received illuminance of photodiode obtains rough Preset Transfer speed in conjunction with empirical value table；
2) optical modem obtains finer object transmission according to Preset Transfer speed, the practical bit error rate and transmission delay
Speed.
7. logical to having the underwater visible light of condition monitoring and operating condition adaptively described in 6 any one according to claim 1
Letter system, which is characterized in that optical receiver assembly has the ability of automatic calibration internal photo driving voltage, specific to walk
Suddenly are as follows:
S1. computing device stops the data transmission procedure of optical launcher and optical receiver assembly；
S2. the driving voltage that optical receiver assembly is arranged is new numerical value；
S3. system optics structure is adjusted, optical receiver assembly is enabled to receive the luminous ray issued from optical launcher；
S4. the output illuminance for continuously changing optical launcher, keeps the photoelectricity flow measuring apparatus inside optical receiver assembly real-time
Measure photocurrent values；
S5. computing device judges whether optical receiver assembly is in linear zone, if being not at linear zone, repeats step
Otherwise S2-S5 executes step S6；
S6. terminate the automatic control of driving voltage, resume data transmission process；
Wherein: step S5 judges whether the method in linear zone are as follows: judges measured photocurrent values sequence and optical emitting
Exist between the output illuminance of device it is whether linearly related, if it is present showing that optical receiver assembly is in linear zone.
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