| In recent years,people have chosen cars as the means of transportation for travel,and the number and frequency of cars have increased significantly.Many city administrators have chosen to use the Parking Guidance and Information(PGI)system to reduce the high parking costs incurred during parking.Faced with the increasing number of cars and the increasingly complex parking environment,an active PGI system capable of actively guiding the driver to park by wireless communication system is becoming the future development trend of the parking guidance system.As one of the wireless optical communication technologies,ultraviolet light communication technology uses ultraviolet light as a medium for information transmission,and has reliable security,excellent electromagnetic compatibility and strong environmental adaptability.At the same time,it has the ability of non-direct-view communication that cannot be achieved by visible light communication technology.It is a wireless optical communication technology with great potential.Because the use environment of the active PGI system is relatively complicated,the required wireless communication technology can well adapt to complex and changing environmental factors,and at the same time can take into account the increasingly scarce electromagnetic spectrum resources.In this paper,ultraviolet light communication technology is used in an active PGI system.The ultraviolet light communication technology is used in the guidance system to transmit guidance information and is compatible with various parking environments.This makes the PGI system using ultraviolet light communication technology possess a variety of complex parking environments Strong compatibility.The principle,characteristics,link model and influence on human biology of ultraviolet optical communication technology were studied.The feasibility of ultraviolet light communication technology in active parking guidance system and its advantages compared with other wireless communication methods are discussed.The key technologies of ultraviolet light communication technology in the application scenario of active parking guidance system are studied.Finally,the ultraviolet LED was selected as the light source at the transmitting end,the ultraviolet photodiode was used as the photoelectric sensor at the receiving end,and the PPM modulation was used as the signal modulation method,and the corresponding driving circuit and receiving circuit were designed.Based on this,an active PGI system using UV communication technology is designed.Among them,the D *-Lite path planning algorithm is used to dynamically plan the parking route of the vehicle,and ultraviolet light communication technology is used to transmit the guidance signal to the receiving end where the driver is located to realize the active parking guidance function.Experiments show that the designed ultraviolet light communication system can complete the sending and receiving of signals,and realize the accurate transmission of information in a short distance.The path planning algorithm can effectively calculate the travel route of the parking process,and it can be realized by using ultraviolet light Active parking guidance for vehicles. |
