Modeling non-conservative forces for BDS-3 MEO satellites

doi:10.11947/j.AGCS.2022.20210319

Abstract

Abstract: The non-conservative force (NCF) model is one of the main factors that restrict orbit accuracy of BDS-3 satellites. In this paper, several NCF models for BDS-3 MEO satellites were built by compensating typical empirical solar radiation pressure (SRP) models, i.e., the ECOM1 and ECOM2, with earth radiation pressure (ERP), antenna thrust (AT) and the box-wing SRP model. Experiments were carried out with globally distributed stations to compare different NCF models by analyzing the overlap orbit differences and SLR residuals. It's shown that the empirical SRP modes dominate the orbit precision and the ECOM2 is superior to ECOM1 under the nominal yaw steering (YS) mode, while the ECOM1 is less sensitive to different YS modes. The ERP and AT together cause a systematic deviation of about 3 cm in the radial direction of orbit. By modeling the ERP and AT, the SLR residuals bias of satellites C29 and C30 can be almost completely eliminated, but the bias of satellites C20 and C21 increases. In addition, introducing the box-wing model is also beneficial to improve the orbit accuracy.

Key words: BDS-3, solar radiation pressure, earth radiation pressure, antenna thrust, non-conservative forces, SLR residual

CLC Number:

P228

RUAN Rengui, JIA Xiaolin, FENG Laiping, WANG Long, ZHANG Fen. Modeling non-conservative forces for BDS-3 MEO satellites[J]. Acta Geodaetica et Cartographica Sinica, 2022, 51(9): 1862-1869.

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