The Design Of GPS Pocket Terminal Based On Personal Digital Assistant

Computer science changing with each passing day has motivated the development of geographic information system greatly and brought infinitude of energy. With the rapid development of micro-electronic and photoelectron technologies, we are on the verge of a new computing paradigm. Mobile computing system based on personal digital assistant (PDA) products has been used widely. It is not Arabian nights for mobile users to operate computers when moving, connect to the network anytime and anywhere in different ways and combine themselves and immense digital space seamlessly.The purpose of the paper is to develop a GPS pocket terminal system Based on PDA (personal digital assistant). The system integrated the mobile computing technology and digital vector map. It has the function of the visualization , query, and analysis of spatial information. Besides it is more important that system is mobile, and enables users to enjoy location-based Service anytime and anywhere.The research of the paper involves such technology as embedded developing(mainly software development), computer graphics, driver development, interface circuit design of USB, location and navigation based global positioning system(GPS) and the visualization of digital maps.First, the paper analyses the interface of USB and its driver. Second, it set up the whole logical frame structure of software for GPS pocket terminal based on PDA. At the same time, summarizes the factors should be considered in the period of embedded development. Finally, the paper analyses in detail the principle and method of function of software in windows CE based on Embedded visual C++ 4.0.