Research Of A Vehicle Monitoring System For Expressway Based On GPRS/GPS

The Vehicle Monitor System integrates Geography information techniques, Global Positioning techniques, Current Telecommunication Scheme into high- tech system. Its mostly function is the mobile target installed GPS receiver transfer it's the information of dynamic location, time, states to monitor center by Wireless communication way, then display the mobile target'moving track in electronic map which have powerful inquiry function. Monitor center monitor the parameters which user have interest in that is mobile target's location, state, direction etc. According in these information, monitor center can manage vehicle, raise vehicle'running efficiency, And insure vehicle'safety.Firstly this paper introduces the general situation of the expressway in our country and the circumstance of the supervision system. Then the paper introduced the actual circumstance of the expressway in our province. This paper puts forward an important solution of the Intelligence Transportation System. That is the Vehicle Monitor System.This paper describes the Telecommunication techniques, the Global Positioning system (GPS to position the composing, the signal structure and basic principle), the Geography Information Techniques of the system. The point discusses the Telecommunication Net-Plan of The Vehicle Monitor System based GPS, including the list letter way to call the net, Trunked Mobile Radio System, Satellites communication system, Global System for Mobile Communication. Comparing to their merit and shortcoming, the GSM net is selected for a widely existing over our country, the network facilities is most sound, the network applied most mature , the network can provide the speech, data, message and travel extensively several business of etc., the network of GPRS setting up on this foundation has the baud rate big, the frequency making use of the resources high, support various network agreement and support to travel extensively etc. According to the service and characteristic of GPRS, GPRS is chose by the Vehicle Monitor System based GPS of expressway.This paper puts forward the expressway administration make use of a net project that the GPRS/ GPS/ GIS carries out the Vehicle Monitor System based GPS. In the end it can carry out to the supervision of the vehicle and the function of the managements. According to the structure of this system, the total function of the software designed. It includes following few aspects: The function of GIS, core function, system manages the function, business application function and systems to gather the successful ability. The paper emphasize particularly on studying GPRS. For understanding of thee working principle of the Vehicle Monitor System based on GPRS, the service and the characteristic of GPRS are introduced briefly, and its data flow is described, which is of great importance to know the system. The design scheme of the system including its constitute and its working principle are presented. The GPRS communication unit in mobile terminal sends the information which includes GPS information and the appropriation APN information was by the station to the GPRS service supporting node (SGSN). Then SGSN communicate with GGSN, GGSN deal with the data, then through DDN or Internet roads to the supervision center ,then marking contain car carry the unit address of a data of cent wrap coming from the supervision center, received by the GGSN, then delivering it to the SGSN, to the mobile terminal. The data that resolves the car to carry the GPS fixed position management system deliver" bottleneck" problem. With the development of GPRS, it is concluded that the Vehicle Monitor System will have better application prospect in the management of expressway.