Design And Implementation Of Key Modules Of Beidou/GPS Dual Mode Navigation Terminal

Satellite-based navigation device is widely used in transportation,monitoring and rescue activities. It will rise at the average speed of 99.3% growth in the navigation market of China in the next five years. It means an average annual consumption of tens of millions. But 95% of navigation terminals are using GPS technology. While our Beidou navigation system only shares less than 1%. Our government actively develops the Beidou satellite navigation.Beidou navigation experimental system was successfully biuild up in 2003.Until now the ninth satellite of Beidou II navigation system is successfully launched. In 2020, the 35-satellites Beidou global navigation system will be completed.This paper is to develop a BeiDou/GPS dual-mode navigation terminal using Android OS and is based on one Science and Technology research project of Chongqing.The terminal is designed to receive two kinds of satellite signals with both the GPS high positioning accuracy and Beidou satellite packet communication, thus ensuring the user terminal can receive satellite positioning signal whenever and wherever.This thesis's main contents include the following:①Build the hardware and software development platform. Using UT6410 and HMBY/CZ4 Beidou receiver,build Android system in the way of source code.②Compare the output format of signals of Beidou receivers with GPS signals. Change the format of Beidou signal into GPS format.③Rearch the process of GIS geting GPS signal from the hardware. Design functions to make the converted signal and Beidou GPS signal reporte to the GIS in the same mode, so the user can choose the positioning mode easily.④Design and implement the graphic Beidou communication program on Android.⑤Design and implementation communication mechanisms for process and threads, solving the conflict between the main process'file reading and writing with the child threads'writing action.The rearch and development of this terminal can promote Beidou navigation technology. This terminal can be applied to positioning, navigation, communication and monitoring. It is highly valueable and great promotional.