CN109150303A - A kind of urban road laser communication method and system - Google Patents
A kind of urban road laser communication method and system Download PDFInfo
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- CN109150303A CN109150303A CN201811280076.9A CN201811280076A CN109150303A CN 109150303 A CN109150303 A CN 109150303A CN 201811280076 A CN201811280076 A CN 201811280076A CN 109150303 A CN109150303 A CN 109150303A
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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
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
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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
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
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Abstract
本发明提供一种城市道路激光通信方法及系统，方法包括：在城市道路边特定区域内设置与路灯高度相仿的激光通信路面单元，同时，在车辆顶部位置设置激光通信车载单元；当车辆经过设置有激光通信路面单元的区域时，激光通信路面单元与激光通信车载单元之间发生信息交互。系统包括：设置在城市道路边的激光通信路面单元和设置在车辆顶部的能够与激光通信路面单元进行信息交互的激光通信车载单元。当车辆行驶至激光通信路面单元附近时，本发明中激光通信路面单元能够瞄准捕获激光通信车载单元的位置，并与之建立稳定的通信链路，发生信息交互，便于激光通信路面单元获取行驶车辆实时的位置、速度信息，便于激光通信车载单元获取道路信息。
The invention provides an urban road laser communication method and system. The method includes: setting a laser communication pavement unit with a height similar to that of a street lamp in a specific area beside an urban road; at the same time, setting a laser communication vehicle-mounted unit at the top of the vehicle; When there is an area with a laser communication pavement unit, information exchange occurs between the laser communication pavement unit and the laser communication vehicle-mounted unit. The system includes: a laser communication pavement unit arranged on the side of an urban road and a laser communication vehicle-mounted unit arranged on the top of the vehicle and capable of information interaction with the laser communication pavement unit. When the vehicle travels near the laser communication pavement unit, the laser communication pavement unit in the present invention can aim to capture the position of the laser communication vehicle-mounted unit, and establish a stable communication link with it, and information exchange occurs, which is convenient for the laser communication pavement unit to obtain the driving vehicle. The real-time position and speed information is convenient for the laser communication vehicle-mounted unit to obtain road information.
Description
Technical field
The invention belongs to technical field of photo communication, are related to laser communication method, in particular to a kind of to be suitable for urban road
The laser communication transmission method and system of short-distance and medium-distance.
Background technique
Light wireless communication has the advantage of fiber optic communication and mobile communication as a kind of novel communication technology, can
Realize broadband transmission, networking maneuverability is not necessarily to frequency application, and electromagnetism interference, good confidentiality, therefore nowadays to wireless
The research of optic communication receives extensive attention.Also, the light source of the light wireless communication of short-distance and medium-distance also has low-power consumption, longevity
The advantages that life, low cost.
In light wireless communication system, using LED as light source, receiving end is connect transmitting terminal using optical detector (PD)
It receives.But light wireless communication system link is affected, while light wireless communication has penetrability by atmospheric channel by weather
It is weak, the shortcomings that nontransparent object can not be penetrated, thus application is extensive not as good as microwave communication.
Traditional capture for applying to laser communication aims at the long range laser that method for tracing mainly applies to space communication
Communication, wherein the optical antenna of high optical quality is mostly used greatly due to aiming at tracking mainly for the large scale capture in space,
Rough tracking servo turntable constructs capture, aiming, tracking (ATP) system.
To provide the laser communication channel of high efficient and reliable, the main success that the foundation of its channel is improved using following items technology
It probability and holds time, stability: utilizing high stability Position-Sensitive Detector (Position Sensitive
Detector, PSD) light beam is adjusted, the bias light in PSD is eliminated using plasmon and is interfered, to improve PSD detection
Accuracy.But present laser communication capture aiming tracking does not minimize, portability, can not be in ubiquitous networks such as car networkings
Network uses generally to be used in scene.
Summary of the invention
To solve the above problems, the present invention, which provides one kind, can be used for urban road communication and urban road target positioning scene
The system that the capture of lower laser communication aims at method for tracing and realizes this method.It can make vehicle in the process of moving, with road
The static information transmit-receive terminal in side carries out stable, efficient information exchange.
In order to achieve the above object, the invention provides the following technical scheme:
A kind of urban road laser communication method, includes the following steps:
Laser communication road surface unit with street lamp similar elevation is set in the specific region of urban road side, meanwhile, in vehicle
Laser communication on board unit is arranged in top position；
When vehicle through the region for being provided with laser communication road surface unit, laser communication road surface unit and laser communication vehicle
Information exchange occurs between carrier unit:
The signal that laser communication road surface unit receives gateway transmission is filtered signal and modulates the signal to after amplifying
It is transmitted on light；
Laser communication on board unit receives the laser signal that road surface unit issues, and converts thereof into electric signal, is filtered
And enhanced processing, and modulate signals into and move base band, convert a signal into corresponding image in 2 D code, be transmitted to roof into
Row display；
The camera that laser communication road surface unit aims at acquisition and tracking module obtains two-dimensional barcode information, and letter is extracted from image
Breath.
Further, the information exchange step specifically includes following process:
The signal processing subsystem of laser communication transmitting module in the unit of laser communication road surface receives the letter of gateway transmission
Number, and sending digital signal reception unit to, digital signal reception unit is filtered and amplifies to signal, and is sent to light tune
In unit processed, received signal is added in the driving current signal of laser LED by the light-modulating cell, driving LED light hair
Light is transmitted to modulate the signal on light；
Optical detector receives the laser signal that road surface unit issues in laser communication on board unit receiving module, is converted
At electric signal, passes to and receive circuit and be filtered and enhanced processing, and be transferred at signal by digital signal transmission unit
Subsystem is managed, signal processing subsystem modulates signals into and moves base band, is then transferred to information by digital signal line
Control module or even In-vehicle networking；
In laser communication on board unit, control module receives the digital signal of In-vehicle networking transmission, passes through digital signal
Line transfers to signal processing subsystem, and signal processing subsystem converts a signal into corresponding image in 2 D code, is transmitted to roof
Display screen is shown；The camera of the aiming acquisition and tracking module of laser communication road surface unit obtains two-dimensional barcode information, signal
Processing subsystem receives the signal of camera, and information is extracted from image, information is then transferred to control by digital signal line
Molding block.
Further, information exchange step further includes following process:
Laser communication road surface unit receives the location information for the laser communication on board unit transmitted by image in 2 D code
And velocity information, the laser emitting module of laser communication transmitting module and the laser of laser communication on board unit are realized using algorithm
The alignment of communication receipt module and the holding of communication link.
Further, the algorithm is pid control algorithm.
A kind of urban road laser communication system, laser communication road surface unit and setting including urban road side is arranged in
In the laser communication on board unit that can carry out information exchange with laser communication road surface unit of vehicle roof；
Laser communication road surface unit includes laser communication transmitting module, aims at acquisition and tracking module and control module；
Wherein, laser communication transmitting module includes laser emitting module, a signal processing subsystem, at laser emitting module and signal
It manages subsystem to be connected, signal processing subsystem is connected by gateway with road surface unit back-end server；Laser emitting module includes
Digital signal reception unit and light-modulating cell, the digital signal reception unit receive the number sent from signal processing subsystem
Word signal is filtered and amplifies, is sent in light-modulating cell, and received signal is added to laser by the light-modulating cell
In the driving current signal of LED, driving LED light shines, and is transmitted to modulate the signal on light；Aim at acquisition and tracking mould
Block includes camera module, signal processing subsystem, and camera module is connected with signal processing subsystem, and being used for will be collected
Image data is transmitted in signal processing subsystem；Signal processing subsystem receives the information transmitted from digital signal line, will believe
Number modulate and move on suitable frequency band, be transmitted to laser emitting module；The signal from camera is received simultaneously, from image
Information is extracted, information is then transferred to control module or even gateway by digital signal line；Control module is for executing aiming
Acquisition and tracking algorithm adjusts the angle of mechanical holder subsystem；
Laser communication on board unit includes at least one two dimensional code display module, laser communication receiving module and control mould
Block, two dimensional code display module and laser communication receiving module are connected with control module respectively, and control module is connected with In-vehicle networking；
Two dimensional code display module includes display screen and signal processing subsystem, and display screen is connected with signal processing subsystem, the signal
Processing subsystem is connected with control module；Laser communication receiving module includes photoelectric detection module and signal processing subsystem, light
Electric detecting module is connected with signal processing subsystem, and signal processing subsystem is connected with control module；Photoelectric detection module includes
Optical detector receives circuit and digital signal transmitting unit, and optical detector receives the laser signal that road surface unit issues, by its turn
It changes electric signal into, passes to and receive circuit and be filtered and enhanced processing, and signal is transferred to by digital signal transmission unit
Processing subsystem；The signal processing subsystem of laser communication on board unit is transmitted by digital signal line reception from control module
Information converts a signal into corresponding image in 2 D code, is transmitted to display screen；It also receives and is passed from laser communication receiving module simultaneously
The signal come, demodulates and moves base band, information is then transferred to control module or even In-vehicle networking by digital signal line；
Control module is for coordinating between two dimensional code display module and In-vehicle networking, between laser communication receiving module and In-vehicle networking
Information transmitting.
Further, the display screen is arranged in roof.
Compared with prior art, the invention has the advantages that and the utility model has the advantages that
1. the present invention is under unpiloted scene, it can be achieved that the instant messages of the traffic system in each section and each vehicle
Interaction, to more effectively be controlled traffic condition.
2. there is the present invention two-dimensional barcode information to return mechanism, the relevant information of vehicle is transmitted using visible light communication,
Increase the accuracy for aiming at tracking.
3. method of the invention can provide more efficient accurate under urban road scene compared with traditional wireless communication
Channel establish, stronger data security and the higher rate of information throughput.
4. system transmitting terminal can be coupled on light pole, cost is both saved, is also convenient for large-scale application.
5. system components compact, portability is high, and complexity is low, and universality is good, is conducive to promote.
Detailed description of the invention
Fig. 1 is laser communication road surface cellular construction schematic diagram.
Fig. 2 is laser communication on board unit structural schematic diagram.
Fig. 3 is the information exchange schematic diagram of optical communications module and laser communication on board unit.
Specific embodiment
Technical solution provided by the invention is described in detail below with reference to specific embodiment, it should be understood that following specific
Embodiment is only illustrative of the invention and is not intended to limit the scope of the invention.
The present invention provides a kind of urban road laser communication method, includes the following steps:
Laser communication road surface unit with street lamp similar elevation is set first in the specific region of urban road side, meanwhile,
In vehicle roof position, laser communication on board unit is set.
When vehicle through the region for being provided with laser communication road surface unit, laser communication road surface unit and laser communication vehicle
Information exchange occurs between carrier unit.
Realize the above method, the present invention provides urban road laser communication systems, including are arranged on urban road side
Laser communication road surface unit and be arranged in vehicle roof can with laser communication road surface unit carry out information exchange laser
Communication vehicle carried unit.
As shown in Figure 1, laser communication road surface unit is arranged on section periphery, laser communication road surface unit is divided into three big moulds
Block, respectively laser communication transmitting module aim at acquisition and tracking module and control module.Wherein, laser communication transmitting module packet
Laser emitting module, a signal processing subsystem are included, laser emitting module is connected with signal processing subsystem, signal processing
System is connected by gateway with road surface unit back-end server.Laser emitting module mainly includes digital signal reception unit and light
Modulation unit, the digital signal reception unit receive the digital signal sent from signal processing subsystem, are filtered and put
It is big etc., it is sent in light-modulating cell, received signal is added to the driving current signal of laser LED by the light-modulating cell
On, driving LED light shines, and is transmitted to modulate the signal on light.Aim at acquisition and tracking module include camera module,
Mechanical holder subsystem, signal processing subsystem, camera module are connected with signal processing subsystem, are used for collected figure
As data are transmitted in signal processing subsystem, camera module is fixed on mechanical holder subsystem, by mechanical holder subsystem
System adjusts the angle of camera module, and mechanical holder subsystem is connected with control module, controls mechanical holder by control module
The movement of system.Control module aims at acquisition and tracking algorithm for executing, and adjusts the angle of mechanical holder subsystem.Control module
Including microcontroller, using signal can be received, the control chip of operation and processing, such as single-chip microcontroller, CPU.Signal
Processing subsystem receives the information transmitted from digital signal line, modulates signals into and moves on suitable frequency band, is transmitted to sharp
Optical transmitter module；The signal from camera is also received simultaneously, and information is extracted from image, information is then passed through into digital signal line
It is transferred to control module or even gateway.
As shown in Fig. 2, laser communication on board unit includes at least one two dimensional code display module, laser communication receiving module
And control module, two dimensional code display module and laser communication receiving module are connected with control module respectively, control module with it is vehicle-mounted
Network is connected.Two dimensional code display module includes large-area displays screen and signal processing subsystem, at large-area displays screen and signal
It manages subsystem to be connected, the signal processing subsystem is connected with control module.Control module is for coordinating two dimensional code display module
Information transmitting between In-vehicle networking, between laser communication receiving module and In-vehicle networking.Control module includes microcontroller,
Using signal can be received, the control chip of operation and processing, such as single-chip microcontroller, CPU.Laser communication receiving module packet
Photoelectric detection module and signal processing subsystem are included, photoelectric detection module is connected with signal processing subsystem, signal processing subsystem
System is connected with control module.Photoelectric detection module includes optical detector, receives circuit and digital signal transmitting unit.PD (visit by light
Survey device) laser signal that road surface unit issues is received, electric signal is converted thereof into, reception circuit is passed to and is filtered and amplifies
Processing, and signal processing subsystem is transferred to by digital signal transmission unit.Signal processing of laser communication on board unit
System receives the information transmitted from control module by digital signal line, converts a signal into corresponding image in 2 D code, transmits
To roof large-area displays screen；The signal transmitted from laser communication receiving module is also received simultaneously, demodulates and move base band, so
Information is transferred to control module or even In-vehicle networking by digital signal line afterwards.Laser communication on board unit is generally arranged at vehicle
At top, transmitted convenient for signal.
As shown in Figure 3, on the one hand, in the unit of laser communication road surface, the signal processing subsystem of laser communication transmitting module
System receives signal (low latency control information, vehicle mounted multimedia information, road and the weather money including automatic Pilot of gateway transmission
News etc.), and send digital signal reception unit to, digital signal reception unit is filtered and amplifies to signal, and is sent to
In light-modulating cell, received signal is added in the driving current signal of laser LED by the light-modulating cell, drives LED
Lamp shines, and is transmitted to modulate the signal on light.Then, the PD in laser communication on board unit receiving module (visit by light
Survey device) laser signal that road surface unit issues is received, electric signal is converted thereof into, reception circuit is passed to and is filtered and amplifies
Processing, and signal processing subsystem is transferred to by digital signal transmission unit.Above-mentioned signal processing subsystem modulates signals into
And base band is moved, information is then transferred to control module or even In-vehicle networking by digital signal line.On the other hand, swashing
In optic communication on board unit, control module receives the digital signal (including speed and location information) of In-vehicle networking transmission, passes through
Digital signal line transfers to signal processing subsystem.Signal processing subsystem converts a signal into corresponding image in 2 D code, passes
Roof large-area displays screen is delivered to be shown.Then, the camera of the aiming acquisition and tracking module of laser communication road surface unit
Obtain two-dimensional barcode information, signal processing subsystem receive camera signal, from image extract information (including location information and
Velocity information), information is then transferred to control module or even gateway by digital signal line.
Laser communication road surface unit receives the location information for the laser communication on board unit transmitted by image in 2 D code
And velocity information, laser emitting module and the laser communication of laser communication transmitting module are realized using algorithm (pid control algorithm)
The alignment of the laser communication receiving module of on board unit and the holding of communication link.
Based on the systems and methods, when near vehicle driving to laser communication road surface unit, laser communication road surface is single
Member aims at the position of capture laser communication on board unit, and establishes stable communication link therewith, and information exchange occurs.Convenient for swashing
Optic communication road surface unit obtains the real-time position of driving vehicle, velocity information, obtains road letter convenient for laser communication on board unit
Breath, thus overcome present laser communication capture aiming tracking not minimize, portability, it can not be in ubiquitous networks such as car networkings
Network is with the deficiency generally used in scene.
The technical means disclosed in the embodiments of the present invention is not limited only to technological means disclosed in above embodiment, further includes
Technical solution consisting of any combination of the above technical features.It should be pointed out that for those skilled in the art
For, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also considered as
Protection scope of the present invention.
Claims (6)
1. a kind of urban road laser communication method, which comprises the steps of:
Laser communication road surface unit with street lamp similar elevation is set in the specific region of urban road side, meanwhile, on vehicle top
Position installs laser communication on board unit；
When vehicle through the region for being provided with laser communication road surface unit, laser communication road surface unit and the vehicle-mounted list of laser communication
Information exchange occurs between member:
The signal that laser communication road surface unit receives gateway transmission is filtered signal and modulates the signal on light after amplifying
It is transmitted；
Laser communication on board unit receives the laser signal that road surface unit issues, and converts thereof into electric signal, is filtered and puts
Big processing, and base band is modulated signals into and moves, corresponding image in 2 D code is converted a signal into, roof is transmitted to and is shown
Show；
The camera that laser communication road surface unit aims at acquisition and tracking module obtains two-dimensional barcode information, and information is extracted from image.
2. urban road laser communication method according to claim 1, which is characterized in that the information exchange step is specific
It comprises the following processes:
The signal processing subsystem of laser communication transmitting module in the unit of laser communication road surface receives the signal of gateway transmission, and
Send digital signal reception unit to, digital signal reception unit is filtered and amplifies to signal, and is sent to light modulation list
In member, received signal is added in the driving current signal of laser LED by the light-modulating cell, and driving LED light shines, from
And it modulates the signal on light and is transmitted；
Optical detector receives the laser signal that road surface unit issues in laser communication on board unit receiving module, converts thereof into electricity
Signal passes to and receives circuit and be filtered and enhanced processing, and it is sub by digital signal transmission unit to be transferred to signal processing
System, signal processing subsystem modulate signals into and move base band, and information is then transferred to control by digital signal line
Module or even In-vehicle networking；
In laser communication on board unit, control module receives the digital signal of In-vehicle networking transmission, is turned by digital signal line
Signal processing subsystem is given, signal processing subsystem converts a signal into corresponding image in 2 D code, is transmitted to roof and shows
Screen is shown；The camera of the aiming acquisition and tracking module of laser communication road surface unit obtains two-dimensional barcode information, signal processing
Subsystem receives the signal of camera, and information is extracted from image, information is then transferred to control mould by digital signal line
Block.
3. urban road laser communication method according to claim 1, which is characterized in that information exchange step further include as
Lower process:
Laser communication road surface unit receives the location information and speed for the laser communication on board unit transmitted by image in 2 D code
Information is spent, the laser emitting module of laser communication transmitting module and the laser communication of laser communication on board unit are realized using algorithm
The alignment of receiving module and the holding of communication link.
4. urban road laser communication method according to claim 1, which is characterized in that the algorithm is PID control calculation
Method.
5. a kind of urban road laser communication system, which is characterized in that the laser communication road surface including urban road side is arranged in
Unit and the laser communication on board unit that information exchange can be carried out with laser communication road surface unit that vehicle roof is set；
Laser communication road surface unit includes laser communication transmitting module, aims at acquisition and tracking module and control module；Wherein,
Laser communication transmitting module includes laser emitting module, a signal processing subsystem, and laser emitting module and signal processing are sub
System is connected, and signal processing subsystem is connected by gateway with road surface unit back-end server；Laser emitting module includes number
Signal receiving unit and light-modulating cell, the digital signal reception unit receive the number letter sent from signal processing subsystem
Number, it is filtered and amplifies, be sent in light-modulating cell, received signal is added to laser LED by the light-modulating cell
Driving current signal on, driving LED light shine, transmitted to modulate the signal on light；Aim at acquisition and tracking module
Including camera module, signal processing subsystem, camera module is connected with signal processing subsystem, is used for collected figure
As data are transmitted in signal processing subsystem；Signal processing subsystem receives the information transmitted from digital signal line, by signal
It modulates and moves on suitable frequency band, be transmitted to laser emitting module；The signal from camera is received simultaneously, is mentioned from image
It wins the confidence breath, information is then transferred to control module or even gateway by digital signal line；Control module is caught for executing to aim at
Track algorithm is obtained, the angle of mechanical holder subsystem is adjusted；
Laser communication on board unit includes at least one two dimensional code display module, laser communication receiving module and control module, and two
Dimension code display module and laser communication receiving module are connected with control module respectively, and control module is connected with In-vehicle networking；Two dimension
Code display module includes display screen and signal processing subsystem, and display screen is connected with signal processing subsystem, the signal processing
Subsystem is connected with control module；Laser communication receiving module includes photoelectric detection module and signal processing subsystem, and photoelectricity is visited
It surveys module to be connected with signal processing subsystem, signal processing subsystem is connected with control module；Photoelectric detection module is visited comprising light
It surveys device, receive circuit and digital signal transmitting unit, the laser signal that optical detector reception road surface unit issues converts thereof into
Electric signal passes to and receives circuit and be filtered and enhanced processing, and is transferred to signal processing by digital signal transmission unit
Subsystem；The signal processing subsystem of laser communication on board unit receives the letter transmitted from control module by digital signal line
Breath, converts a signal into corresponding image in 2 D code, is transmitted to display screen；It also receives and is transmitted from laser communication receiving module simultaneously
Signal, demodulate and move base band, information is then transferred to control module or even In-vehicle networking by digital signal line；Control
Molding block is used to coordinate the letter between two dimensional code display module and In-vehicle networking, between laser communication receiving module and In-vehicle networking
Breath transmitting.
6. urban road laser communication system according to claim 5, which is characterized in that the display screen is arranged in vehicle
Top.
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