The principle of POD is introduced systematically in this dissertation. The related time systems and coordinate systems are outlined, including the relation-ship between them, respectively. The measurement models and dynamic models are involved more detailed. And a residual analysis method is briefly described. Based on the above theory, in reference to the international program of POD, using newer models and parameters, Precision Orbit Estimate Determination of Yunnan Observatory (POREDY for short) is established. The PODs of LAGEOS-1/2, Ajisai, Beacon-C are calculated by POREDY. The residual analysis method is used to remove outliers. It appears optimal and reliable after excluding outliers. Further more, the RMS is similar to the results of CSR at Texas over the same period. So that the results of POREDY are reliable, and it can be used widely for a variety of scientific research. Using POREDY, an orbit improvement method is investigated just using single-station SLR observational data. The range data with high precision and the tracking data (that are angular data) of the telescope recorded in the process of the ranging observation are synthesized. The tracking vector is used as the observation. The method takes fully advantage of the high precision of the range data, and can improve the precision of i and Ω. And no other experiments and observations are required. The feasibility and effectiveness are validated by calculating on Ajisai and LAGEOS-1. The establishment of POREDY filled the vacancy in the POD study area of Yunnan Observatory. Based on POREDY, and the high-performance and high-precision platform running it, a variety of studies can be done, such as the motion of the geocenter, station coordinates determination, Earth orientation parameters estimation, etc.
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