| The vehicle navigation, position and monitor-control system is a High-tech system that blends the high new technique of Global Position System(GPS), geography information system(GIS), modern communication technique(GSM) .through the accurate fixed position, match with to correspond by l technique of GSM and numerical maps, the vehicle navigation and position system and can carry out the reasonable supervision and dispensations to the vehicle. Through comprehensive analysis to many factors,It can obtain to satisfy the applied information of demand quickly, and can mean with the map, sketch or the form of the data processed of result. the paper mainly include: 1) The basic principle of GPS technical and GIS technical. 2) The GPS data processing and GSM data transfering. 3) The optimal path analysis. 4)The technique of map-matching. 5) The system function introduction and implemention. The receiver of GPS constantly receives and computes the GPS fixed position information, and these information were delivered to computer. These information are to can't be used before withouting processing. Therefore, we must extract these information through a procedure, and convert them to the fixed position information which have the actual meaning and can be used by decision-maker。Similar to other communication Protocol, we must know the structure of frame, and then can achieve all kinds of the position information. We will get the information of longitude and latitude of the vehicle after processing these data. Then using the technique of the map-matching will get the vehicle's coordinate, and display on the map, then accomplish the vehicle position. The short message of GSM is a kind of information that sends out by making use of the Free time. The network of the GSM In this system, the position information of the vehicle delivers the surveillance and control center through the GSM, the surveillance and control center direct and attemper the vehicles through the GSM. |
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