The Research And Realization Of GPS Location System Based On ARM Microprocessor

From the 1970s in the 20th century, the United States Department of Defense approved to begin the research and development of Global Positioning System (GPS),to be fully completed in 1994 . GPS is established to satisfy the military on the sea, land and air transport carriers with high-precision navigation and positioning requirements. GPS is accepted the success of the meridian system experience, it is the second generation of satellite navigation systems of the United States. In recent years, with GPS technology in the field of the application of basic research and in the new areas of application, the launch navigation and positioning technology has entered a new era.Currently, GPS technology has been widely applied to resource exploration, aviation and satellite remote sensing, traffic information systems, moving targets gun and urban control network improvements, and other scientific technology and economic development fields .The successful application of GPS technology showed that the high precision and high efficiency of the satellite positioning technology, also demonstrated its superiority and great potential.GPS receivers is to use the basic principles of GPS for design, it's compact, easy to carry, and could use the all-weather, real-time positioning equipment. Currently, the GPS receivers on development drawing on the development of technology abroad .The main components of GPS receivers are made into VLSI chips, and integrated in a circuit board - the GPS receiver module. The module is receiving GPS signal, signal processing, the output signals and positioning results, and other functions. Users can use GPS modules secondary development of hardware and software, can be developed into various applications of GPS. Since GPS module prices much lower than unit prices, according to the application and the need for special development, so along with GPS technology in various fields, and promote the popularization. This small GPS Module with good performance and low price, light weight flexible and easier to develop the advantages of being increasingly widespread concern and favor.This paper is based on the ARM microprocessor GPS System Design and Implementation, and starting on the basis of the second development of OEM. GPS positioning system via the GPS receiver module from GPS satellite positioning, after further storage and handling, showing on the LCD real-time. The entire system is used S3C44B0X Samsung ARM processor as the development board and chip UC/OSII embedded operating system as a hardware / software platform, use GPS module is the GARMIN15L sensor module of the GARMIN, according to international standards NMEA-0183 agreement.In the system design process, do a lot of work on the large number of embedded processors and embedded operating system for the research, Analysis and comparison. Currently, the domestic chip ARM7 development is the Samsung of S3C44B0 and S3C4510.The former concentrates on the PDA application. Integrated within the chip LCD controller, SDRAM controller, two serial interface controller, IIS controller, Real-time clock, A/D conversion and so on lots of external control modules; and then S3C4510 is one network application-specific CPU, 44B0 lacks of such a large number of external control modules, but integrated with a powerful network control module can support 100BASE network interface. According to the design of the system needs S3C44B0 undoubtedly is the first choice; Embedded operating system in the selection, uC/OSII is the first choice. Because, as Samsung S3C44Box microprocessor use ARM7TDMI, it is a highly efficient, low-power RISC processor, but it does not have MMU. uC/ OSII operating system and Without MMU Embedded System has good advantages in technology. As uC/OSII operating system and the structure is very simple, could easily be transplanted to various microprocessors, and so the system use uC/OSII in the operating system.The system completed 44B0 Development Board, GARMIN15L GPS module and LCD display equipment and other hardware platform structures. Achieving the handling of operating system of uC/OSII and the transplant of the Microprocessor S3C44B0X, on this basis, and completed the application program. In the actual system software development, system and application procedures are coupled together, and they complement each other, coordinate the operation. The GPS data in the background handling, the system is a measurement of static positioning function, Therefore, using the average method to do data error processing. Such the methods are the main characteristics of the receiver can be eliminated in the resting state of very serious drift. By a certain period of time the number of measurement points GPS data storage, calculated these positioning data to the average to eliminate errors, thereby improving the accuracy of the system.In summary, Based on this paper, the GPS system for the design and realization of a more in-depth study. Focused on achieving the right structures hardware environment, the operating system uC/OSII transplantation and application development. Basically achieved the target system design requirements.