| The technology of vehicle position is approved along with its development and popularizing. The major works of this thesis are studying Vehicle Mobile Positioning system, and devising the construct of GPS/GSM and some details such as the software and hardware composition.In the end, there are some forcasts for the technology of vehicle Mobile Positioning.The master function of vehicle positioning follows:the receiver obtains the accurate geographical coordinate, azimuth, attitude and other navigation datas on the automobile by the GPS, then tansmit these information to monitoring center by the form of short news. The monitoring center fulfills the accurate positioning of vehicle depending on the contents of short news, which is based upon integrating the GIS (Geographic Information System) map in the monitoring center. Although GPS positioning is with high accuracy, it has some defects that reception can be blocked by obstacles between GPS receiver and satellites.For the sake of improving the technology, a scheme is designed in this paper that GPS positioning is compensated by the GSM network positioning.The major works of this thesis are as follows:1. The system scheme adopting GPS positioning and GSM network transmiting the positional informations is brought forward by analyzing detailedly the charactors of the GPS and GSM. The complete set of design on vehicle position system is finished, then the terminal vehicle position system is studied from the two aspects of software and hardware.2. According to the requirement of the devising software and hardware, a 89C52 chip computer combining with GPS·OEMGN-77N board and TC35I module is choose to finish the devising of electric circuit by experiments and comparing the nature of model .3. For existence of defect when GPS performing task, for example automobile travel in avenue, STK(SIM TOOL KIT) card improve accuracy of positioning by GSM network .after many times experiments the method is proved to be effective.
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