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

doi:10.11947/j.AGCS.2022.20210532

Abstract

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 D_c 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 D_2c and D₀ parameters as well as that between D_2s and B_s parameters.Based on the strong correlations,the eight-parameter ECOM2 model and the seven-parameter ECOM2 model are proposed,where the parameters D_2c and D_2c/D_2s 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 D_2c and D_2s 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

CLC Number:

P228

LI Xingxing, LI Jie, YUAN Yongqiang, ZHENG Hongjie, HUANG Shi, LIU Chengbo, ZHANG Keke. Assessment and improvement of the empirical solar radiation pressure models for BDS-3 satellites[J]. Acta Geodaetica et Cartographica Sinica, 2022, 51(8): 1680-1689.

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