The Research On Identification Technology Of Parking Vehicles'identity Information Based On Visible Light Communication

As people have higher requirements for material living standards,the number of private cars has skyrocketed,and parking problems caused by inefficient parking and parking difficulties have become commonplace.In response to these problems,both domestic and foreign countries are committed to researching intelligent,unmanned parking systems.Intelligent parking is now an important part of the Intelligent Transportation System(ITS).This article applies the automotive lighting system to the field of vehicle identification,which is of great significance to the realization of intelligent and unmanned parking,and has great potential for development.At the same time,visible light communication technology is a new type of communication method developed on the basis of white light LED technology.It utilizes the LED's high-speed dot extinction feature to modulate at a frequency that is not perceived by the human eye,meeting the lighting requirements while also being able to transfer information.It also has the advantages of available frequency bandwidth,no electromagnetic interference,and universal application.It has great potential for development and the prospect of practical application is worth looking forward to.Combining automotive LED headlamps with visible light communication technology,it can also realize information transmission while realizing road lighting,and can realize vehicle identification function with low cost and low power consumption.The application of the intelligent parking system in a special place sensitive to electromagnetic interference can alleviate parking congestion and improve efficiency,and has great development prospects.The main contents of the full text are as follows:(1)Give the physical model of visible light communication between fixed point of car and parking lot,workflow,the basic structure of LED headlamps for automobiles,and the characteristics of white LEDs;study the characteristics of visible light communication links and transmission channels;common modulation methods A simulation comparison was made to determine the use of OOK(On-Off Keying)as the modulation method of this paper.(2)Established the attenuation model of the direct outdoor channel near the ground of the car,analyzed the characteristics of the background noise of sunlight,and simulated the visible light communication under the background light condition using Optisystem software,and realized the data rate of 10kb/s,and the transmission distance was as high as 10m.The minimum BER reaches BER 5.43075×10~-2121 for communications.(3)The whole conception of parking management based on visible light communication is expounded,and a visible light communication character transmission system based on OOK modulation is designed.First,the feasibility was verified through an audio visible light communication circuit.The BER is then used as an indicator to measure the quality of character transmission communication,and its performance is tested by changing the communication distance,transmitter and receiver angles,indoor fluorescent lighting and outdoor sunlight.The results show that the system can achieve stable communication within a range of 110cm under the darkroom condition.After the condenser lens is added,the communication distance can reach 3.5 meters.For the outdoor parking lot visible light communication research provides a basis to reduce the cost.