【摘 要】
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The accuracy of satellite ephemeris directly affects the accuracy of navigation and positioning. The BDS-3 under construction in China is based on the BDS-2 system, and the Beidou global satellite nav
【机 构】
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College of Geology Engineering and Geomantic,Chang’an University,Xi’an 710054,Shanxi, China
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The accuracy of satellite ephemeris directly affects the accuracy of navigation and positioning. The BDS-3 under construction in China is based on the BDS-2 system, and the Beidou global satellite navigation system with global service capability is built. The BDS-3 system is in operation before and after the official operation. The accuracy of satellite ephemeris needs to be analyzed to provide a reference for its builders and users.As a high-precision external evaluation method, satellite laser ranging (SLR) can be used to check the Beidou satellite orbit. This paper discusses the principle of using SLR to check the Beidou satellite orbit. The SLR observation data from August to October 2018 is used to evaluate the satellite broadcast ephemeris orbit and precision ephemeris orbit of the BDS-3 network. The results show that the radial accuracy of C20, C21, C29 and C30 satellite broadcast ephemeris orbitals are 12.92cm, 15.08cm, 8.53cm and 10.74cm, respectively, and the radial accuracy of the precision orbit are about 7cm.
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