The Design And Implementation Of GPS Module Of Mobilephone Based On Windows Mobile Operating System

GPS is the abbreviation for the Global Positioning System. It is the satellite system which can be obtained the information of geographic position and accurate time.After business usage of GPS , GPS terminal system is to be the main product in the GPS market.The flourishing of mobile phone and its portable,agile characteristic makes the combine of GPS and mobile phone which increase rapidly in GPS market. In the near future, along with the mature and development of the wireless mobile position services technology, people can enjoy various LBS (Location Based Service).How to realize the GPS function on the smart mobile phone based on Windows Mobile operating system? Building the GPS module of the mobilephone based on Windows Mobile Operating System, hardware is the basis, and the windows mobile operating system is the platform for software. They played an important role in the whole GPS mobile phone. So, this paper focus on the study of hardware platform and Windows mobile operating system.Firstly, the paper briefly analyzed the GPS development status quo and prospect at home and abroad, then introduced the fundamental of the GPS, and described the research purpose of the subject. This mobilephone choose the GPS solution of SiRF Corporation, and we designed the hardware system according to the solution. This paper analyed the CPU chip (S3C2442B of Samsung) and GPS chip ( SiRF Star3f/LP of SiRF Corporation), and finished the circuits design, such as the front part of RF, receiver, RTC, power, controlling and data signal part .We research the Serial Port Driver model of the windows CE, finish the Serial port Driver, realize the communication between the CPU and GPS module. For shorting the TTFF (time to first Fix), SiRF Corporation provide theAGPS(Assisted GPS ) solution——CLM (Client Location Management) .Because thephysical Serial Port was occupied by GPS, this subject fulfill the CLM function through virtual Serial Port to realize the AGPS solution.Finally, the paper summarized the work of system design, figured out the deficiencies and improvements, and the future development direction.