GPS Observation Data Simulation And Error Analysis

As a result of the GPS positioning technology widespread use, the research on observation file received is also getting more and more. Using computer technology, taking the GPS positioning system basic principle as the foundation, this thesis has realized the static observation data simulation using the C#.NET programming, and can produce the observation file effectively. The thesis primarily including following several aspects:(1) The thesis has analyzed the satellite positioning basic principle, has studied the GPS satellite signal propagation errors and has made the analysis to model errors, and has developed the corresponding program module.(2) The calculating of the satellite coordinates is discussed in detail, and the thesis has analysised how to calculate the satellite coordinates in steps; And using the Lagrange multinomial to the calculation of the satellite coordinate with precision ephemeris, obtaining satellite coordinates in every 15 second. The thesis also compare the results of the two methods, and the two results are almost the same, and this confirmed the satellite coordinate is correct.(3) The thesis has introduced the coordinates system, time system, the coordinates transformation, the RINEX file type, the form of data, the type of value in the observation file, which are used in simulating the observation file.(4) The thesis has analysised and studied the structure and the function of the simulation observation file programmes, and worked out how to read the navigation file, read the precise ephemeris file and the creation of observation file with using the C#.NET technology, and has produced many observation files with the program.(5) According to the distance between the two observation stations and choose to read the observation file or the precise ephemeris file, and then create the observation files. Using TGO and LGO software to test and calculate the baseline using the observation files which are simulated with the programme.The thesis has analyzed the results of different baselines and errors.And in the last chapter, the thesis made a simple analysis of the problems which are still needed to be settled, and introduced the direction of the observation file stimulantion.