GPS Point Postioning Using Undifferenced Obserbation And Program Implementation

With the improvement of GNSS and establish CORS station in many big cities of China, GNSS is more and more popular. This thesis theoretically analyzed mathematical model and method of undifferenced point positioning. and all kinds of error correction model, such as ionospheric delay correction, tropospheric delay correction, earth rotation correction, relativistic effect, antenna calibration ect. In view of this, the paper develops program of point positioning using pseudorange and broadcast ephemeredes, precies ephemeredes. The given practical example proved the program and some useful conclusions are obtained.In order to weaken the ionosphere delay, Klonuchar correct model is used for single-frequency receivers and real-time observations data for double-frequency receivers. As to troposphere delay, the paper use Saastamoinen model and Hopfield model to correct them. In this approach, the IGS precise orbits and satellite clocks are used together for single point positioning to make the program run more simple and more practical. In addition, receiver clock were discussed in detail in this paper. In order to verify its effectiveness, using the commercial software Pinnacle for data processing,the result show that both of the trend is the same and the different value is not more than 0.2ns, can satisfy the single point positioning requirement. The different regions datas is used to verify the program and the results is well-received, and its internal precision can reach the precision of point positioning, its external precision can be at 7cm, basically reaching the poor single point positioning of the research level at home and abroad.Figure [17] table [5] Reference[58]...