A Design For 4G Beidou Terminal Based On ARM+DSP Architecture

Beidou satellite navigation system is an important national strategic of "Thirteen five plan".As its application side, Beidou Positioning Terminal has a broad application market and important research value. The main research content is to improve the positioning accuracy and effect of the Beidou Positioning Terminal. Secondly, combined the Beidou Positioning with other technologies, such as the sensor for the navigation, Wireless network for the Internet of things is also the main direction of research. 4G technology is a new generation mobile communication protocol, which has the advantages of wide bandwidth and high transmission speed, and it is the best mobile media for the Beidou terminal to access the Internet.In this paper, a method of realizing 4G-Beidou Positioning Terminal based on ARM and DSP is studied, which is used to improve the positioning accuracy of the Beidou satellite receiver. The main contents of this paper are as follows:First, the hardware terminal based on ARM and DSP dual processor is designed. ARM module, DSP module, 4G module, Beidou positioning module, serial port module and power module are designed respectively by using the modular design method. Each part is introduced including the Chip model, specifications, circuit and interface definition, and the circuit board is drew through Altium Designer software to complete the hardware circuit design.Secondly, the embedded Linux system is built on the S3C6410 platform and the environment variable is set. The embedded BOA server is transplanted and built as a display platform for the network map, then the script file is written, and the Baidu map API is called to complete the network map. The embedded mitab library is built and the local map is displayed by using the Qt program to call the *.mif file. Then the Qt-Embedded platform is built for running the Qt program and Qt procedures is written for receiving serial information. The serial port information is transmitted to the Xml file and the mitab library function respectively,meanwhile, the positioning and the historical point is displayed position on the touch screen.The map switch under the different condition of the 4G signal is designed.Finally, the external Flash memory of TM320VC5509A is extended for curing DSP program by using EPM240 and AM29LV800B. The method of realizing the sampling serial port and the way of selecting the best Beidou information through Beidou protocol is introduced respectively, and the UKF filter algorithm is realized in DSP to improve the positioning accuracy. In this paper, the performance of the Beidou Positioning Terminal is analyzed by simulation and actual measurement, and the index of the terminal is evaluated by the method of comparative analysis. The causes of the positioning errors and the advantages and disadvantages of the terminal is also studied, and the problems is put forward that the terminal has not been resolved and the work that needs further research in the future. In this paper,the network map is realized by using 4G, and the positioning accuracy improved by UKF filtering algorithm,which provides a reference for the design of the positioning terminal.