| In recent years, with the rapid development of technology and navigation technology, the navigation technology has been widely used in people’s daily life and related scientific research activities. GNSS systems constantly improve, upgrade and expand the application field. It has extended a space for the development of information science development research. It has become the logo and important part of the country, the national science and technology progress.For developing of the space technology around the world, and the background of the coexistence of multiple satellite navigation and positioning system, Chinese workers put forward the concept of construction of multimode integrated satellite system as early as2005. These multi-mode navigation system can calculate the different characteristics of different types of data from fusion navigation system, gain new positioning results, so as to realize the system navigation ability, accuracy, reliability and automation degree improved. It has become one of the important direction of current satellite positioning technology.As now the multimode system research and development trend is changing, according to different characteristics of Beidou satellite navigation system and GPS, through combining the two system, it make its implementation function complementary and information exchange, as well as to ensure the positioning precision will guarantee its development in a deeper, more extensive direction. So this topic is committed to fully absorb and draw lessons from existing research results of positioning technology, and on the basis of research by improving star algorithm to realize the Beidou/GPS dual-mode system high precision positioning.The main research contents and innovative work of this thesis includes:(1) Combine beidou system-GPS constellation distribution characteristics. The compatibility of coordinating system and time system are analyzed, various theoretical parameters of the both system are analyzed, provide a theoretical basis for the co-system in combination calculating method.(2) Based on the analysis of the existing single system navigation star algorithm implementation mode and characteristics of the premise, this paper put forward a modified star algorithm use the high Angle and azimuth of the filter as the main means. Moreover according to the practical application of some special constellation that may occur in the scene condition, the star algorithm is improved. And modified satellite selected algorithm give out a detailed introduction of the application scenario of determination method and process of application.(3) After the basic principle and calculating method of the traditional single positioning system is studied, on the basis of further improve the observation equation, proposed in an integrated navigation positioning system (Beidou-GPS) decoding method, in order to gain the positioning results combination of dual system. For calculating process, the possible errors source are analyzed, and puts forward the corresponding method of reduce error.At the end of the paper, using the actual measurement of experimental data, based on MATLAB platform, the author studies on the theory and the method is verified and analyzed. From the operational efficiency of constellation selected algorithm, visible satellite number, positioning accuracy and GDOP value and many other angles, the feasibility of the calculating method of this paper is verified. Verification results show that the presented method for calculating the combination of navigation and positioning in guarantee of the premise of certain location accuracy, can greatly improve the operation efficiency of the system, the design of Beidou and GPS integrated navigation positioning system can realize the user positioning of the practical application requirements. |
PDF Full Text Request