Designing The GPS Receiver Interface Software And Establishing The Navigation System

With the development of social economy and modern information technology, the integration of communication, navigation, control and computer science has been applied to vehicle transportation and formed to the real-time, exact and high-efficiency transport system —ITS(Intelligent Transport System) which has already become one of the important methods for solving city traffic problems. The vehicle location system, one fundamental part of ITS, has become the research hotspot. Many companies are aiming at the latent market, and developing the products enthusiastically. Under the circumstances, we combine the GPS with GIS (Geographic Information System) technology to design and establish a navigation system. The research of this thesis is one part of a project of the Education Reform and Development Program in 21st Century of China. According to the condition of China, combining the situation of vehicle location, the paper integrates GPS and GIS, uses MapX5.0 ActiveX Control of MapInfo Company's product inserting Visual C++6.0 to develop, sets up a real time location system based on GIS. In the design, I divide the system into 3 subsystems, which are map management editor, serial-port transmission and location. The 3 subsystems, each department its duty and suit, distribute operations, common complete the functions system management, map editor, and location. The paper focuses on the following contents: 1. Design GPS system basing on OEM of "Jupiter"GPS. The software of GPS receiver is more and more getting the attention of people. It already expands from military affairs and recovery field to commercial and civil field gradually. This is carrying out the big prerequisite of development and project research. Rockwell's "Jupiter"GPS receiver is used in the project. It is designed for low cost and maximum flexibility in a wide range of OEM configurations including handhelds, panel mounts, sensors, and in-vehicle automotive products. The receiver continuously tracks all visible GPS satellites and uses all the measurements to produce an overdetermined, smoothed navigation solution. 2. Use Visual C++ 6.0 to design communication interface program, using Control to design communication of serial interface, finish the design of saving the transmission data. Because of "Jupiter"GPS receiver's software taking over signals under DOS environment, in order to rise the expansibility of receiver, the readability of signals and convenience to user, I directly show data under Windows by Visual C++ 6.0. Through serial-port collection GPS data that follows NMEA0183 agreements, after handling the data, the program preserve location, time, speed and course etc. in database by ODBC. This program matches the independent database, which offers accurate data to the location system. 3. Finish the common function design of the Electronic Map by MPX5.0 and Visual C++ 6.0, including insert, dispose, save, output, print Electronic Map; transfer database and create Theme Map; design of all kinds of GIS Tool; design of View etc; MapX is the important control, which support project development. MapX ActiveX Control is MapInfo company offer to user, which has powerful map analysis function. It support the most Visual development environment, such as Visual C++, Visual Basic, Delphi and PowerBuilder. Its major functions include thematic mapping, mapping refinedly layer of layer, data binding, annotation, make layers, raster image, label automatically, tools and map editing. 4. Realize real time display of vehicles in the Electronic Map; in order to real time monitor vehicles, realize real time the location system of the vehicles based on GIS. In this paper, a set of software and hardware project is designed to receive the positioning data from GPS successfully, based on the positioning principle of GPS, the characteristics of technology and the project practice. And combined with some knowledge about GIS, a way to implement vector electronic map by Maplnfo is put forward. Furthermore, the integration of GPS and GIS is finished in order to transmit and display in real-time the vehicle positioning data in the electronic map. To reduce of the total cost, Vehicle Location and Navigation System designed in this paper chooses a single GPS receiver to position,as a result, the positioning precision of the system is affected. To improve the precision of positioning, a definite algorithm is designed and used to make the signals of GPS and electronic map match, which has greatly improved the qualities of real-time,...