BDS/SLR Combined Precise Orbit Determination Based On Observation Range

With the development of the GNSS,satellite precision orbiting has become the focus of research and hotspot in satellite navigation.With the maturity of BDS precision orbiting technology and the gradual increase of global tracking stations,the fusion of multiple GNSS systems for precision orbiting can no longer effectively improve the accuracy of BDS precision orbiting.So the introduction of SLR technology,SLR can enhance the accuracy of BDS precision orbiting and improve the accuracy of BDS precision orbiting.SLR technology is introduced.SLR can be used as an external verification tool to evaluate the GNSS precision ephemeris and has great significance for the joint BDS/SLR precision orbiting research.Using SLR observations,the precision ephemeris products of BDS are evaluated.The experimental results show that the accuracy of the C01 satellite precision ephemeris provided by WHU has been improved by 30.44 cm due to the Solar Radiation Pressure model was updated.And the accuracy of the C01 satellite precision ephemeris provided by GFZ has been improved by 30.44 cm.The precision ephemeris of the C01 satellite from the GFZ has been improved twice by 18.47 cm and 13.82 cm of the orbiting strategy and the update of the SRP model.In comparison,the precision ephemeris of the C08 and C10 satellites are better than 7 cm,and the C11 satellite is better than 5 cm.Based on the precision orbiting of navigation satellites,the principle of satellite laser ranging and parameter estimation methods are introduced to realize the joint GNSS/SLR precision orbiting.Several vital theories and practices in the fused BDS/SLR precision orbiting are investigated.The experimental results show that with SLR observations,the orbit accuracy of the GEO satellite 3D directional overlapping arc segment is improved by more than 37 cm.In comparison,that of the IGSO/MEO satellite is enhanced by more than 12 cm.The results show that the results of the PPP experiments with the joint precision orbit and clock products are improved compared with those with the original precision products.In the E,N and U directions,the static PPP increased by 0.17 cm,0.08 cm and 0.30 cm,respectively,while the dynamic PPP increased by 0.10 cm,0.16 cm and 1.65 cm.The paper has 37 figures,18 tables and 95 references.