Bus Automatically Stop And Map Matching

Nowadays,most buses in large cities are used artifical sound- announcing-station,by which a driver or steward presses a sound-key to announce the station. But mistaken announcing station or leaking station often happens because of bad weather, people's crowding or mood-changing etc. These mistakes can take excessive trouble to passengers particularly to the people who are not familiar to the city. These also bring the city negative influence. So it is necessary to study a auto-announcing station syatem for public traffic.The first chapter introduces the development of ITS,and the relevant knowledges such as Geographical Information System, Global Position System and the design language MapBasic.Then it introduces the theory and the application of GPS,then it emphasizes the application in the troop.Then the third chapter introduces the design setting for embedded bus auto-announcing station,including the softwares and hardwares.At the same time the paper emphasizes the design of the system,from the receiving,the transfer and processing of GPS datum to the design of embedded GIS and the storeing of data.In the forth and fifth chapters, the application of Global Position System (GPS) and design of bus auto-announcing station based on embedded system are studied. Comparing the data got from GPS with the data of station from GIS, as the difference between GPS and GIS is smaller than a certain threshold,the programme of announcing system is started. It designs the order chart of the system and writes main codes.Map-matching is the key technique in vehicle navigate system as well as bus announcing-station system. At the same time, the method of map-matching has its special feathers because the roads of the bus passing by is regular. The paper discusses how to record the road using the diffence datum of GPS received repeatedly, map-matcing with the the datum of GIS, getting ride of the large errors and system errors, decreasing the other errors such as traveling errors .locating errors and electronic map errors etc, obtaining the stable GPS datum, deciding the stationsof the bus runing in or out.lt introduces the primary processing of datum before map-matching,the design of programme order for map-matching,analysing the questions of map-matching.At the end the methods of road-matching based on muzzy-matching are studied. In addition ,the paper looks on the direction of bus as an important factor that the map-matching algorithm designs.At last,the paper introduces the design of the modules for the disposal of datum,embedded system and showing of LCD sac. At the same time ,it introduces the development prospect of embedded bus auto-announcing station system,explaining the necessity of founding whole information management system for city traffic.