CN110417468A - Miniature self-service machine platform downlink data adaptive optical transmitting device and method - Google Patents
Miniature self-service machine platform downlink data adaptive optical transmitting device and method Download PDFInfo
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- CN110417468A CN110417468A CN201910766871.7A CN201910766871A CN110417468A CN 110417468 A CN110417468 A CN 110417468A CN 201910766871 A CN201910766871 A CN 201910766871A CN 110417468 A CN110417468 A CN 110417468A
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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
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/112—Line-of-sight transmission over an extended range
- H04B10/1123—Bidirectional transmission
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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
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/112—Line-of-sight transmission over an extended range
- H04B10/1129—Arrangements for outdoor wireless networking of information
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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
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/114—Indoor or close-range type systems
- H04B10/116—Visible light communication
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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
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/54—Intensity modulation
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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
- H04B10/50—Transmitters
- H04B10/564—Power control
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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
- H04B10/806—Arrangements for feeding power
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
Miniature self-service machine platform downlink data adaptive optical transmitting device and method belong to wireless light communication technical field.Sufficiently large surplus is arranged in terms of communication capacity for unmanned plane radio optical communication system in the prior art, and cost is to sacrifice traffic rate.The invention enables small drone can be according to its state of flight and its wireless light communication channel status, real-time aligned data returns parameter and wireless light communication parameter, under the premise of maintaining normal wireless light communication, traffic rate is improved to greatest extent, and magnanimity initial data is returned with traffic rate as high as possible.The present invention obtains state of flight information, channel state information by inertial sensor, camera respectively；Small drone flying quality, wireless light communication channel characteristic data are therefrom extracted by controller respectively, quasi- return data is optimized into passback parameter coding by encoder, respectively by DC power supply, the focus unit adjustment average intensity of communicating light signal, beam divergence angle, rightly return data in an adaptive way.
Description
Technical field
The present invention relates to a kind of miniature self-service machine platform downlink data adaptive optical transmitting device and methods, belong to wireless optical
Field of communication technology.
Background technique
Small drone has special advantage in terms of real-time monitoring and assessment, for this purpose, the field forward direction high-resolution, height
Frame frequency, wide spectrum and multisensor combined monitoring etc. development, at the same time, there is an urgent need to by magnanimity initial data with lossless
Compress mode returns in real time, and existing radio communication data transmission technology can not be competent at this task, and alternative solution is then
Unidirectional optical communication link is established in miniature self-service generator terminal, ground surface end, after keeping miniature self-service generator terminal to be directed at tracking with ground surface end,
Data back is realized in a manner of wireless light communication, completes downlink data optical transport.But in downlink data optical transmission process
In, due to the influence of environmental factor, the state of flight of small drone and the channel status of wireless light communication are all changing at any time,
This has larger impact to message transmission rate, the stability of link, communication bit error rates.
In existing unmanned plane atmospheric channel wireless light communication technical field, do not take specially handle reply state of flight,
Influence of the variation of channel status to wireless light communication is only arranged in terms of communication capacity for unmanned plane radio optical communication system
Sufficiently large surplus can guarantee normal communication under state of flight and the maximum conditions of channel status.But, this method is simultaneously
Be not suitable for the small drone wireless light communication for needing in a manner of lossless compression to return magnanimity initial data in real time, because, such as
Fruit sets communication capacity according to severe maximum conditions, and surplus is excessive, although the variation of state of flight, channel status is to wireless optical
The influence of communication does not show not come out, and still, communication capacity setting its excessive cost of surplus is to sacrifice traffic rate, especially in normality
Lower such traffic rate seems too low, it is difficult to high speed passback magnanimity initial data.
Summary of the invention
It is an object of the present invention to enable small drone according to its state of flight and its wireless light communication channel shape
State, real-time aligned data return parameter and wireless light communication parameter, under the premise of maintaining normal wireless light communication, maximum limit
Degree improves traffic rate, for this purpose, we have invented a kind of miniature self-service machine platform downlink data adaptive optical transmitting device and sides
Method, can according to the variation of state of flight and wireless light communication channel status, adaptive adjustment and optimization data back parameter and
Wireless light communication parameter returns magnanimity original number so that traffic rate can maximize always with traffic rate as high as possible
According to.
The miniature self-service machine platform downlink data adaptive optical transmitting device of the present invention is it is characterized in that, data source and coding
Device is connected, encoder built-in storage unit；Encoder, amplifier, T-type bias device, light emitting diode are sequentially connected, and T-type is inclined
It sets device and is connected to DC power supply；Beam shaping emission system is set in going out for light emitting diode, beam shaping transmitting system in light optical path
Focus unit built in uniting；The image planes of imaging optical system are overlapped with the photosurface of camera, camera, inertial sensor respectively with control
The input terminal of device is connected；The output end of controller is connected with DC power supply, focus unit, encoder respectively；Beam shaping transmitting
Optical system, imaging optical system, inertial sensor are mounted in the same dimensional turntable, beam shaping optical transmitting system
Optical axis is parallel with the optical axis of imaging optical system；The effect of encoder is that quasi- return data is carried out passback parameter coding, makes to intend
The communication electric signal that return data becomes conducive to passback, and the wireless light communication channel characteristic data and small sent according to controller
Type unmanned plane during flying data optimize the passback parameter of quasi- return data；The effect of storage unit is the caching of data；Amplifier
Effect is will to communicate electric signal to carry out power amplification；The effect of DC power supply is the wireless light communication channel sent according to controller
Performance data and small drone flying quality adjust the height of DC voltage and are supplied to T-type bias device；T-type bias device
Effect is the bias voltage for the communication electric signal that the DC voltage for providing DC power supply is arranged via power amplification；Luminous two
The effect of pole pipe is that communication electric signal is converted to the Communication ray with a certain average intensity under the driving of the bias voltage
Signal；The effect of beam shaping emission system is by built-in focus unit, according to the wireless light communication channel of controller transmission
Performance data and small drone flying quality, adjust the beam divergence angle of communicating light signal；The effect of imaging optical system is by nothing
The light of linear light communication ground surface end secondary light source transmitting images on the photosurface of camera, and is converted to electronic image conduct by camera
The channel state information of wireless light communication；The effect of inertial sensor is to obtain the state of flight information of small drone；Control
The effect of device be respectively from the channel state information of wireless light communication, small drone state of flight information in extract wireless optical
Communication channel characteristics data, small drone flying quality.
The miniature self-service machine platform downlink data adaptive optical transmission method of the present invention it is characterized in that, unmanned generator terminal with
After ground surface end is aligned and keeps tracking, in unmanned generator terminal, the state of flight information of small drone is obtained by inertial sensor, by
Imaging optical system images in the light that wireless light communication ground surface end secondary light source emits on the photosurface of camera, and is turned by camera
It is changed to channel state information of the electronic image as wireless light communication；Controller is respectively received the state of flight of small drone
Information, wireless light communication channel state information after, respectively therefrom extract small drone flying quality, wireless light communication channel
Performance data, and it is sent to encoder, DC power supply, the focus unit in beam shaping emission system simultaneously；Data source will be intended
Return data is input in encoder, and quasi- return data is carried out passback parameter coding by encoder, is obtained conducive to the logical of passback
Believe electric signal, the small drone flying quality and wireless light communication channel characteristic data that encoder is sent further according to controller,
Optimize the passback parameter of quasi- return data；The communication electric signal carries out power amplification by amplifier, and is sent into T-type bias device；
The wireless light communication channel characteristic data and small drone flying quality that DC power supply is sent according to controller, adjust direct current
The height of pressure is simultaneously supplied to T-type bias device, then sets the DC voltage to by T-type bias device the biased electrical of communication electric signal
Pressure；Light emitting diode is driven by the bias voltage, communication electric signal is converted into the letter of the Communication ray with a certain average intensity
Number；Wireless light communication channel characteristic data that focus unit built in beam shaping emission system is sent according to controller and small-sized
Unmanned plane during flying data adjust the beam divergence angle of communicating light signal and to the ground end transmitting.
The present invention it has technical effect that, realizes small drone magnanimity initial data using the device and method of the present invention
Passback, wireless light communication parameter, including signal light beam divergence angle and average intensity, data back parameter, including data length, number
According to density (data break) and message transmission rate, and non-default excessive surplus, and on-fixed and unalterable, but according to small
The state of flight of type unmanned plane and the channel status of wireless light communication adjust wireless light communication parameter and optimization data back in real time
Parameter gets rid of the interference of state of flight, the undesirable change of channel status to small drone downlink data optical transport, is maintaining just
Under the premise of normal wireless light communication, traffic rate is improved to greatest extent.Otherwise, wireless light communication parameter, data back parameter
Surplus is preset excessive, and cost is the reduction of traffic rate；If being preset as seeming just right a certain fixed value, work as flight
There is more apparent undesirable change in state, channel status, and the influence to wireless light communication is default beyond this, then wireless light communication
It can not be normally carried out.
For example, the state of flight of small drone by three axis angular rates, 3-axis acceleration, three axis magnetic force characterize, by comprising
The inertial sensor acquisition of three axis accelerometer, three-axis gyroscope, three axle magnetometer, therefrom extracts small drone by controller
Flying quality, including flying speed, with the distance between ground surface end and flight stability, and be sent to encoder, straight simultaneously
Focus unit in galvanic electricity source, beam shaping emission system.When flying quality is respectively that flying speed is fast between ground surface end
When distance is remote, flight stability is low, encoder is transmitted with shorter data length, the low and lower data of lower packing density
Rate carries out passback parameter coding to quasi- return data；The higher DC voltage of direct-current power supply T-type bias device, it is final to improve
The average intensity of communicating light signal；The beam divergence angle of focus unit expansion communicating light signal.Otherwise do adjustment contrary to the above.
The channel status of wireless light communication is characterized by scintillation effect, is obtained by camera, therefrom extracts wireless optical by controller
The channel characteristic data of communication, including atmospheric coherence length, refractive index structure parameter and atmospheric channel decay time, and send out simultaneously
Give encoder, DC power supply, the focus unit in beam shaping emission system.When meteorological condition difference, scintillation effect is obvious,
Atmospheric coherence length is short, refractive index structure parameter is big, atmospheric channel decay time is short, encoder with shorter data length, compared with
The low and lower message transmission rate of low packing density carries out passback parameter coding to quasi- return data；Direct-current power supply T
The higher DC voltage of type bias device, the final average intensity for improving communicating light signal；Focus unit expands communicating light signal
Beam divergence angle.Otherwise do adjustment contrary to the above.
Detailed description of the invention
Fig. 1 is the miniature self-service machine platform downlink data adaptive optical transmitting device structural schematic diagram of the present invention, while
It is the miniature self-service machine platform downlink data adaptive optical transmission method schematic diagram of the present invention, which doubles as being Figure of abstract.
Specific embodiment
In the miniature self-service machine platform downlink data adaptive optical transmitting device of the present invention, the phase of data source and encoder
Even, encoder built-in storage unit.Encoder, amplifier, T-type bias device, light emitting diode are sequentially connected, and T-type bias device connects
There is DC power supply.Encoder is a kind of specific integrated circuit (ASIC), built-in 128Mb storage unit.Amplifier is a kind of broadband
Amplifier.The offset signal rate of T-type bias device reaches as high as 50GHz.In going out in light optical path for light emitting diode, light beam is set
Shaping emission system, focus unit built in beam shaping emission system.The luminous point of light emitting diode is located at beam shaping transmitting
At system focus.Beam shaping emission system is transmission type optical system, by first fixed group, zoom group, compensation group and rear solid
Fixed group composition, the bore of optical system are 60mm, and focal length is 50~200mm, automatically controlled in the focal range by focus unit
Focusing.The transmitting optical power of light emitting diode is 50mw, and transmitting signal rate is 2.5Gbps.The model of DC power output voltage
It encloses for 0~5V, output maximum current is 3A.The image planes of imaging optical system are overlapped with the photosurface of camera, camera, inertia sensing
Device is connected with the input terminal of controller respectively.The bore of imaging optical system is 50mm, focal length 85mm.The photodetection of camera
Device is CCD, and resolution ratio is 1280 × 1024, sample frequency 506Hz.The output end of controller respectively with DC power supply, focusing
Unit, encoder are connected.Controller is a kind of specific integrated circuit (ASIC).Beam shaping optical transmitting system, image optics
System, inertial sensor are mounted in the same dimensional turntable, the optical axis of beam shaping optical transmitting system and image optics system
The optical axis of system is parallel.The dimensional turntable can rotate in pitch orientation and azimuth direction.Three axis add built in inertial sensor
Speedometer, three-axis gyroscope, three axle magnetometer.
In the miniature self-service machine platform downlink data adaptive optical transmitting device of the present invention, the effect of each component part
It is identical as the explanation of this specification Summary.
In the miniature self-service machine platform downlink data adaptive optical transmitting device and method of the present invention, the wireless optical is logical
The channel state information of letter refers to scintillation effect；The state of flight information of the small drone includes three axis angular rates, three axis
Acceleration, three axis magnetic force；The wireless light communication channel characteristic data includes atmospheric coherence length, refractive index structure parameter and big
The gas channel fading time；The small drone flying quality includes that the distance between flying speed and ground surface end and flight are steady
It is qualitative；The passback parameter includes data length, packing density and message transmission rate；The average intensity, beam divergence angle are referred to as
For wireless light communication parameter.
The miniature self-service machine platform downlink data adaptive optical transmission method of the present invention also has the feature that
The state of flight information for the small drone that controller reception is sent from inertial sensor, including three axis angular rates,
3-axis acceleration, three axis magnetic force derive small drone flying quality with inertial navigation technology, including flying speed, with
The distance between ground surface end and flight stability.
When small drone flying quality be respectively flying speed it is fast, with the remote, flight stability of the distance between ground surface end
When low, encoder is with shorter data length, the low and lower message transmission rate of lower packing density to quasi- return data
Carry out passback parameter coding；The higher DC voltage of direct-current power supply T-type bias device, it is final to improve being averaged for communicating light signal
Light intensity；The beam divergence angle of focus unit expansion communicating light signal；Otherwise do adjustment contrary to the above.
Controller receives the electronic image sent from camera, calculates the brightness change of electronic image, obtains light intensity flashing number
According to, then from light intensity glint data derive wireless light communication channel characteristic data, including atmospheric coherence length, refractive index structures are normal
Several and atmospheric channel decay time.
When meteorological condition difference, scintillation effect is obvious, and atmospheric coherence length is short, refractive index structure parameter is big, atmospheric channel
Decay time is short, and encoder is with shorter data length, the low and lower message transmission rate of lower packing density to intending back
It passes data and carries out passback parameter coding；The higher DC voltage of direct-current power supply T-type bias device, finally improves communicating light signal
Average intensity；The beam divergence angle of focus unit expansion communicating light signal；Otherwise do adjustment contrary to the above.
Claims (9)
1. a kind of miniature self-service machine platform downlink data adaptive optical transmitting device, which is characterized in that data source and encoder
It is connected, encoder built-in storage unit；Encoder, amplifier, T-type bias device, light emitting diode are sequentially connected, T-type bias device
It is connected to DC power supply；Beam shaping emission system is set in going out for light emitting diode, in beam shaping emission system in light optical path
Set focus unit；The image planes of imaging optical system are overlapped with the photosurface of camera, camera, inertial sensor respectively with controller
Input terminal is connected；The output end of controller is connected with DC power supply, focus unit, encoder respectively；Beam shaping emits optics
System, imaging optical system, inertial sensor are mounted in the same dimensional turntable, the optical axis of beam shaping optical transmitting system
It is parallel with the optical axis of imaging optical system；The effect of encoder is that quasi- return data is carried out passback parameter coding, makes quasi- passback
The communication electric signal that data become conducive to passback, and the wireless light communication channel characteristic data and small-sized nothing sent according to controller
Man-machine flying quality optimizes the passback parameter of quasi- return data；The effect of storage unit is the caching of data；The effect of amplifier
It is that will communicate electric signal to carry out power amplification；The effect of DC power supply is the wireless light communication characteristic of channel sent according to controller
Data and small drone flying quality adjust the height of DC voltage and are supplied to T-type bias device；The effect of T-type bias device
It is the bias voltage for the communication electric signal that the DC voltage for providing DC power supply is arranged via power amplification；Light emitting diode
Effect be under the driving of the bias voltage, will communication electric signal be converted to the Communication ray with a certain average intensity letter
Number；The effect of beam shaping emission system is by built-in focus unit, and the wireless light communication channel sent according to controller is special
Property data and small drone flying quality, adjust the beam divergence angle of communicating light signal；The effect of imaging optical system is will be wireless
The light of optic communication ground surface end secondary light source transmitting images on the photosurface of camera, and is converted to electronic image as nothing by camera
The channel state information of linear light communication；The effect of inertial sensor is to obtain the state of flight information of small drone；Controller
Effect be respectively from the channel state information of wireless light communication, small drone state of flight information in extract wireless optical logical
Believe channel characteristic data, small drone flying quality.
2. miniature self-service machine platform downlink data adaptive optical transmitting device according to claim 1, which is characterized in that institute
The channel state information for stating wireless light communication refers to scintillation effect；The state of flight information of the small drone includes three shaft angles
Speed, 3-axis acceleration, three axis magnetic force；The wireless light communication channel characteristic data includes atmospheric coherence length, refractive index knot
Structure constant and atmospheric channel decay time；The small drone flying quality include between flying speed and ground surface end away from
From and flight stability；The passback parameter includes data length, packing density and message transmission rate；The average intensity,
Beam divergence angle is referred to as wireless light communication parameter.
3. miniature self-service machine platform downlink data adaptive optical transmitting device according to claim 1, which is characterized in that compile
Code device is a kind of application-specific integrated circuit ASIC, built-in 128Mb storage unit；Amplifier is a kind of broad band amplifier；T-type bias device
Offset signal rate reach as high as 50GHz；The luminous point of light emitting diode is located at beam shaping emission system focal point；Light beam
Shaping emission system is transmission type optical system, is made of first fixed group, zoom group, compensation group and rear fixed group, optical system
The bore of system be 60mm, focal length be 50~200mm, by focus unit in the focal range electric control focusing；Light emitting diode
Transmitting optical power be 50mw, transmitting signal rate be 2.5Gbps；The range of DC power output voltage is 0~5V, and output is most
High current is 3A；The bore of imaging optical system is 50mm, focal length 85mm；The photoelectric detector of camera is CCD, resolution ratio
It is 1280 × 1024, sample frequency 506Hz；Controller is a kind of application-specific integrated circuit ASIC；The dimensional turntable can bow
It faces upward and is rotated on direction and azimuth direction；Three axis accelerometer, three-axis gyroscope, three axle magnetometer built in inertial sensor.
4. a kind of miniature self-service machine platform downlink data adaptive optical transmission method, which is characterized in that on unmanned generator terminal and ground
After end is aligned and keeps tracking, in unmanned generator terminal, the state of flight information of small drone is obtained by inertial sensor, by being imaged
Optical system images in the light that wireless light communication ground surface end secondary light source emits on the photosurface of camera, and is converted to by camera
Channel state information of the electronic image as wireless light communication；Controller is respectively received the state of flight letter of small drone
It ceases, after the channel state information of wireless light communication, it is special therefrom to extract small drone flying quality, wireless light communication channel respectively
Property data, and it is sent to encoder, DC power supply, the focus unit in beam shaping emission system simultaneously；Data source will be intended back
It passes data to be input in encoder, quasi- return data is subjected to passback parameter coding by encoder, obtain the communication conducive to passback
Electric signal, the small drone flying quality and wireless light communication channel characteristic data that encoder is sent further according to controller are excellent
Change the passback parameter of quasi- return data；The communication electric signal carries out power amplification by amplifier, and is sent into T-type bias device；Directly
The wireless light communication channel characteristic data and small drone flying quality that galvanic electricity source is sent according to controller, adjust DC voltage
Height and be supplied to T-type bias device, then by T-type bias device by the DC voltage be set as communication electric signal bias voltage；
Light emitting diode is driven by the bias voltage, communication electric signal is converted into the communicating light signal with a certain average intensity；
The wireless light communication channel characteristic data and small-sized nothing that focus unit built in beam shaping emission system is sent according to controller
Man-machine flying quality adjusts the beam divergence angle of communicating light signal and to the ground end transmitting.
5. miniature self-service machine platform downlink data adaptive optical transmission method according to claim 4, which is characterized in that institute
The channel state information for stating wireless light communication refers to scintillation effect；The state of flight information of the small drone includes three shaft angles
Speed, 3-axis acceleration, three axis magnetic force；The wireless light communication channel characteristic data includes atmospheric coherence length, refractive index knot
Structure constant and atmospheric channel decay time；The small drone flying quality include between flying speed and ground surface end away from
From and flight stability；The passback parameter includes data length, packing density and message transmission rate；The average intensity,
Beam divergence angle is referred to as wireless light communication parameter.
6. miniature self-service machine platform downlink data adaptive optical transmission method according to claim 4, which is characterized in that control
Device processed receives the state of flight information for the small drone sent from inertial sensor, including three axis angular rates, 3-axis acceleration,
Three axis magnetic force derive small drone flying quality with inertial navigation technology, including between flying speed and ground surface end
Distance and flight stability.
7. miniature self-service machine platform downlink data adaptive optical transmission method according to claim 6, which is characterized in that when
When small drone flying quality is respectively that flying speed is fast, remote with the distance between ground surface end, flight stability is low, encoder
Passback parameter is carried out to quasi- return data with shorter data length, lower packing density low and lower message transmission rate
Coding；The higher DC voltage of direct-current power supply T-type bias device, the final average intensity for improving communicating light signal；Focusing is single
Member expands the beam divergence angle of communicating light signal；Otherwise do adjustment contrary to the above.
8. miniature self-service machine platform downlink data adaptive optical transmission method according to claim 4, which is characterized in that control
Device processed receives the electronic image sent from camera, calculates the brightness change of electronic image, obtains light intensity glint data, then from light intensity
Glint data derives wireless light communication channel characteristic data, including atmospheric coherence length, refractive index structure parameter and atmosphere
The channel fading time.
9. miniature self-service machine platform downlink data adaptive optical transmission method according to claim 8, which is characterized in that when
When meteorological condition difference, scintillation effect is obvious, and atmospheric coherence length is short, refractive index structure parameter is big, atmospheric channel decay time is short,
Encoder returns quasi- return data with shorter data length, the low and lower message transmission rate of lower packing density
Pass parameter coding；The higher DC voltage of direct-current power supply T-type bias device, the final average intensity for improving communicating light signal；
The beam divergence angle of focus unit expansion communicating light signal；Otherwise do adjustment contrary to the above.
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| CN110989426A (en) * | 2019-11-15 | 2020-04-10 | 国网河南省电力公司洛阳供电公司 | Unmanned aerial vehicle testing platform with solar power supply and 5G data transmission |
| CN113726427A (en) * | 2021-07-12 | 2021-11-30 | 北京邮电大学 | Unmanned aerial vehicle closed-loop positioning device and method based on optical communication |
| CN116886213A (en) * | 2023-08-22 | 2023-10-13 | 广东海洋大学 | Method for achieving alignment of unmanned aerial vehicle to light source in visible light communication |
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