A study on the Beidou IGSO/MEO satellite orbit determination and prediction of the different yaw control mode

During the conversion between yaw steering and orbit normal mode of the Beidou IGSO and MEO satellite, the dynamic model changes. As a result, the accuracy of the orbit determination and prediction decrease. As the yaw control mode changes, the variation of the dynamic model has been studied. Based on the empirical and analytical solar radiation pressure models, one piecewise model and one linear model have been proposed. The two models were tested with the actual Beidou satellites' on-orbit data. The results showed that the two models which are raised in this paper can improve the accuracy of the Beidou IGSO/MEO orbit determination and prediction.