Slr Technology-based Satellite Precise Orbit Determination

SLR (Satellite Laser Ranging) is one of the important space geodetic advanced techniques. It provides precise range between a laser station and a satellite that is equipped with retroreflectors. In the dissertation, the precis orbit determination on SLR technique is researched. We first present the theory and methods of satellite orbit determination, then therobust estimation and variance component estimation are introduced and applied in the satellite orbit determination to resist the effects of outlying observation and to resolve the problem of weights. By the determination of Lageos2 satellite orbit, we find that the precision of orbit determination is improved with robust estimation which resists the outlying observation, and variance component estimation which gives a reasonable weights for the observations of different stations.As the application of SLR satellite orbit determination, we compute two time series of the geocenter motion with respect to ITRF2000 based on the analysis of the data set of Lageos2 from January 1996 to December 2000 using the direct and dynamic methods. By comparison and analysis, we find that there are annual and semi-annual components in the geocenter motions, but there is no significant long-term movement in the geocenter motions.To compute GLONASS orbit by using SLR data, we add GLONASS models into original precis orbit determination software. In this paper, orbits of the GLONASS satellites are determined by using the SLR data observed from March 28 to April 24, 1999. Finally we compare our results with those satellites computed by CODE. By comparison and analysis, we find that the radial RMS of the orbit differences is smaller then 10 cm. We also find that there is a systematic error in radial direction between SLR and the CODE orbits, and the systematic error varies with the different orbital planes.Combination of space geodetic techniques for satellite orbit determination is one way to improve the precision of the orbit. In the dissertation we discuss the combination of SLR and GPS pseudorange data for GPS35 orbit determination. First, GPS35 orbit is determined by using non-difference pseudorange data, then, GPS35 orbit is computed by using SLR and GPS non-difference pseudorange data. Finally we compare our results with the orbits of satellites computed bylGS. By comparison and analysis, we find that the precision of GPS35 satellite orbit is improved when SLR data is added. We also find that the level of the improvement is not only related to the number of the SLR data, but also related to the distribution of the observation stations.