| With the rapid development of science and technology,the global satellite navigation system occupies a pivotal position in the national economic construction,the America's GPS,Russia's GLONASS and the European GALILEO navigation system has its national military,civil and other aspects of a guiding role.The China's independent research and development of the Beidou navigation satellite system has been in the Asia-Pacific region to provide location services,and positioning accuracy depends on the orbit accuracy,in order to further improve the BDS satellite high-precision positioning capabilities,satellite precision orbit determination is the core issue.Aiming at the problem of precise orbit determination of Beidou satellite navigation system,experiments were carried out by studying the dynamic model and perturbation model that affect satellite orbit accuracy.Firstly,the research status of precision orbit and the global satellite navigation system and the corresponding time and space benchmark are briefly introduced.The principle of precision orbit determination of Beidou satellite is discussed in depth,and the formula is deduced for the determination of the first track and the estimation of orbital parameters.The optimal parameters of the satellite photodynamic model are determined by experimentally analyzing the various photodynamic factors influencing the orbit accuracy.Then,the BDS single system orbit and BDS/GPS fusion orbit determination experiment is carried out based on the non-difference algorithm.Finally,by comparing the orbit results with the GFZ orbital products,and using the MEGX station and the observed data of the domestic CORS station,the Beidou static precision single point positioning experiment is used to verify the orbit accuracy.The results show that the two methods have the same orbit accuracy,and the experimental results can provide reference value for the study of the precise orbit determination of Beidou satellite navigation system at this stage. |
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