Research And Software Realization On Positioning Information Solution For Satellite Navigation

Satellite navigation system aims to provide accurate and continuous information about location, speed and time for various kinds of users and motion platforms. Satellite navigation technique has taken place of radio navigation, astronomical survey and traditional geodetic survey technique. It has contributes a lot to the development of navigation positioning technique and become the widespread adopted technique for navigation positioning, which is the key technical supporting system for the national safety and economical development. The GPS of the United States, the GLONASS of Russia and the Galileo system of Europe which is expected to be brought to use are the navigation systems that we currently use. Therefore, it is very important and necessary to built independent satellite navigation system based on our national conditions. Accordingly, the observation location solution is an important research area for navigation positioning.Firstly, this paper introduces the structure of global satellite navigation system and its development, and summarizes the researches on navigation information solution technique in home and abroad. After the analysis of the basic principles of navigation information solution technique, we focus on the solution for single point absolute positioning. The over design and process of information processing module for software receiver is proposed, and the algorithm modules and error analyzing method of each main part are shown. Finally, according to the actual demand, the solution method based on iterative method of least square method is realized with C language.The simulation and realization are divided into three parts. First, computing the instantaneous location and speed of satellite with the broadcasting ephemeris of GPS satellite and realizing it with C language. Then realizing the positioning solution algorithm with four, five, six and seven satellites separately under the knowledge of the position coordinates and pseudo-range of satellites with C language. The comparison between positioning result error and precision factor is made. Finally, the broadcasting ephemeris and corresponding observation data from NIMA are used to realize the positioning solution algorithm under stationary data with C language. The error analysis of the statistic values of the computation result after one hour is performed and demonstrated. Platform. Realization results show that each part can accomplish its function and the final precision can satisfy the requirement of navigation positioning.