Abstract:
To develop an automatic vehicle location system that an operator can track the locations of vehicles correctly. In this development, the devices required for client side are AGPS-included handset and in-car battery charger. The embedded software in a handset was developed on BREW which is the standard platform on a DCMA-based handset. The dispatching program for an operator was developed on MySQL and in PHP. Testing and analysis results between this system and the others, using a traditional GPS receiver, communicating via GSM/GPRS network, are done. The experimental results suggest that the system avaibility and the location accuracy are better than a traditional GPS receiver, especially in fading environments. In open space, however, the performance of both is similar. Furthermore, the distribution of location data calculated from a handset location is more than that from a traditional GPS receiver. The program for an operation center is comparible to commercial automatic vehicle location system. The main functions of the system consist of information request mode that allows clients to request location-based services from the web server, and request-response mode that allows operators to track the location of user handsets on a web browser, The current operation of the system shows that is runs correctly and meets the scope of requirements