Acta Geodaetica et Cartographica Sinica ›› 2022, Vol. 51 ›› Issue (8): 1680-1689.doi: 10.11947/j.AGCS.2022.20210532

• Collaborative Precision Positioning • Previous Articles     Next Articles

Assessment and improvement of the empirical solar radiation pressure models for BDS-3 satellites

LI Xingxing, LI Jie, YUAN Yongqiang, ZHENG Hongjie, HUANG Shi, LIU Chengbo, ZHANG Keke   

  1. School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China
  • Received:2021-09-16 Revised:2022-03-15 Published:2022-09-03
  • Supported by:
    The National Natural Science Foundation of China (Nos.41974027;42142037);The National Key Research and Development Program of China (No.2021YFB2501100);The Hubei Province Natural Science Foundation (No.2020CFA002);The Sino-German Mobility Programme (No.M-0054)

Abstract: Solar radiation pressure (SRP) is the largest non-gravitational perturbation for GNSS satellites,and is the main error source of GNSS precise orbit determination (POD).Currently,two empirical SRP models,namely the extended CODE orbit model (ECOM) and the updated ECOM (ECOM2) model,are widely used in GNSS POD.However,these two models are not suitable for BDS-3 satellites,as they are designed for GPS and GLONASS satellites.The five-parameter ECOM model exhibits large orbit discontinuities in low β periods.By introducing the first-order harmonic Dc parameter,the orbit overlapping RMS values of CAST satellites can be reduced by 60%,52%,and 29% in the along-track,cross-track,and radial components,respectively.As for the ECOM2 model,strong correlations are observed between D2c and D0 parameters as well as that between D2s and Bs parameters.Based on the strong correlations,the eight-parameter ECOM2 model and the seven-parameter ECOM2 model are proposed,where the parameters D2c and D2c/D2s are not estimated,respectively.The results show that the radial overlapping RMS values can be reduced by about 18% and 27% for CAST and SECM satellites when using the eight-parameter ECOM2 model.In addition,a further reduction of 5.2%~8.5% in the radial overlapping RMS values can be achieved when applying seven-parameter ECOM2 model.By considering both the accuracy of overlapping orbit and SLR residuals,we conclude that the seven-parameter ECOM2 model without D2c and D2s is more applicable for BDS-3 POD.The orbit overlapping RMS values are (5.0,3.4,1.4) cm and (5.4,3.5,1.5) cm for CAST and SECM satellites in the along-track,cross-track,and radial components,respectively.The standard deviation values of SLR residuals are 3.1~3.2 cm and 4.4~4.7 cm for CAST and SECM satellites.

Key words: BDS-3, precise orbit determination, solar radiation pressure, empirical SRP models

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