Research On The Technology Of Vehicle Navigation System Based On GPS/GIS

Global Position System, called GPS also, can provide high precision, all-weather, continuous and real-time three- dimension coordinate, velocity and time. Geographic Information System , called GIS also, On the basis of special geographical datas, used the theory of geographical models, provided a variety of special and dynamic geographical datas. The Integration of GPS and GIS have extensive foreground, which can realize the GPS navigation datas' visualization .integration on the maps, can track and display the position of the object on the maps .vehicle navigation and position system is the type of its application..This paper mainly study the key technique of vehicle navigation and position system, it including reasonable management of the GPS navigation datas, introducing the transform of the coordinate system, discussing the map matching technique so that the vehicles can display correctly on the digital maps, and studying the Dijkstra arithmetic, then on the basis of analyzing, improved the arithmetic so that economize time and EMS memory of the computer, the detailed content as follow:1. Discussed coordinate transform of the same coordinate system and the different coordinate system. That is to realize the transform of WGS-84 to Descartes, so that the GPS datas can display on the digital maps correctly.2. Studied the map matching arithmetic point-based matching and trace-curve matching, then found the disadvantages and shortages of the arithmetic and improve ,so as to advance the precision of the position.3. Rest on the relative knowledge of graph network model .analyzed a variety of short-path arithmetic ,especially,Dijkstra arithmetic.then I found Dijkstra arithmetic used adjacency matrix seek short-path,thus it occupied EMS memory.so I used Node and Arc file storage graph.4. By using Visual Basic 6.0 and MapX control developed a software of vehicle navigation and position system.