Research And Realization Of GPS/BD-2 Integrated Positioning Algorithm Based On DSP

The BD-2 planet orientation system is a new generation of planet navigation system developed by China.As an important information fundmental project in this century,its development and appliance will have fundmental impacts on science research,economy development,state security,state defence and so on.In order to boost the construction of BD-2 planet orientation system,we need to speed up the progress of developing customer terminal equipment(CPE),which is of great importance for BD-2 planet orientation system's appliance in the future.The research of this paper is based on the project of The Development of BD-2 Integrated Navigation CPE,and it focuses on the GPS/BD-2 integrated navigation and positioning arithmetic.In this thesis the basic principles of integrated navigation and positioning are firstly introduced.Then according to the similarity between GPS/BD-2 integrated navigation and positioning mode and GPS/GLONASS integrated navigation and positioning mode,we use the mathematical mode of GPS/GLONASS integrated navigation and positioning for reference to export the mathematical expression of GPS/BD-2 integrated navigation and positioning mode,which is the theoretics basis for arithrnetic's reliazation.According to the expression,for GPS/BD-2 integrated pseudo-range positioning,solutions of the expression require tracking at least 5 navigation satellites simultaneously.Moreover,for the ununification of the reference frames and time system between GPS and BD-2,this thesis analyzes the characteristics and relations between WGS-84 and CGS2000 reference frames,and puts forward a solution that we regard the two reference frames as the same reference frame during calculation,which will reduce the arithmetic's complexity.Then this thesis introduces the structures and characteristics of TMS320C6414 and software development kit CCS,which are the cores of positioning module. Further more,this thesis analyzes the whole framework of the positioning module and illuminates the realization of every sub-module,including picking up original observational data,error correction,DOP's calculation,RAIM,calculation of satellite's position and calculation of CPE's position.What's more,we gives the application interfaces and corresponding explanations of every segment.Finally,this thesis gives the results of testing positioning arithmetic,which validates the feasibility and correctness of integrated pseudo-range positioning arithmetic.