Based On Wireless Communications, Urban Road Traffic Signal Control System

In order to solve the increasingly serious traffic problems in the city, how to carry on effective management and control to the existing traffic becomes an urgent problem that should be solved in transportation of our country. The control system of urban traffic signal is one of mandatory methods to solve the congestion of traffic. The system is used to control and manage the urban road traffic, to realize the intellectual control of the traffic signal, to make the vehicle sail out of the conflict area in good order through regular control and the application of traffic light, playing an important role to the traffic network of urban road smoothly and openly.The telecommunication technique in which the urban traffic signal uses always adopts telephone cables at present. When the project is implemented, the cable generally adopts the way in which erecting in the sky or underground lay. But there are various kinds of aerial or underground facility in the city, so the on-the-spot traffic situation is very complicated and brings a lot of difficult to the implementation of project, such as high costs and so on.This thesis puts forward and designs a kind of new-type Traffic Light Control System of Urban Road based on Wireless Telecommunication. This system includes Traffic Signal Control Device, Wireless GPRS MODEM and the software of the server center. The system adopts GPRS wireless telecommunication as the method to transport the data of traffic signal control. This method can solve the problem of high costs and the difficult problems we faced when we use wired telecommunication cable system at present.Traffic Signal Device adopts microchip to control and uses the mode based on timetable. Through setting up the traffic signal mode and signal control scheme, the Signal Control Device coordinates and controls vehicles arrive while the green light begins, realize green waveband control, improve the speed of vehicle driving and the capacity of road, guarantee the none-congestion of the backbone, and reduce the delay in the course of going of vehicle.The central part of GPRS wireless MODEM adopts CSM91-900/1800 GSM/GPRS wireless module of CELLON Company, using microchip to controlthe module realize GPRS wireless group network based on dial connection way and realize the wireless access of such equipments as the service center of the system, traffic signal control device, etc.This thesis has finished prototype design and development of Traffic Signal Control Device of the Traffic Light Control System of Urban Road based on Wireless Telecommunication, the prototype design and development of GPRS Wireless MODEM and the basic function of the server software. The thesis is success in utilizing the way of GPRS wireless telecommunication to carry on data transmission, realize green waveband control based on timetable and achieve the anticipated goals.Gong Yingying(Telecommunications and information System)Directed by Zeng Liansun...