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Precise Real-Time Orbit Determination Model Using Space-Borne Single-Frequency GPS Observations" />
To eliminate the influence of the ionosphere we construct the group and phase ionosphere correction (GRAPHIC) with single-frequency GPS pseudo-range and phase observations. At the same time, we add pseudo-ambiguity parameter to the orbit determination filter to absorb the broadcast ephemeris errors. We assess the absorption effect and accuracy of real-time orbit determination for space-borne single-frequency GPS with real GPS measurements of 8 different low earth orbit satellites. The results show that the accuracy of real-time orbit determination improves greatly with GRAPHIC measurements. The position accuracy is 0.44-055 m and the velocity is 0.37-0.63 mm/s. The accuracy improvement is about 40% compared to the traditional dual-frequency pseudo-range real-time orbit determination method. We believe that with the real-time orbit determination algorithm mentioned in this paper, high precise orbit determination results can be achieved with low-cost single-frequency GPS receiver."/>
星载单频GPS实时精密定轨模型研究
Abstract：To eliminate the influence of the ionosphere we construct the group and phase ionosphere correction (GRAPHIC) with single-frequency GPS pseudo-range and phase observations. At the same time, we add pseudo-ambiguity parameter to the orbit determination filter to absorb the broadcast ephemeris errors. We assess the absorption effect and accuracy of real-time orbit determination for space-borne single-frequency GPS with real GPS measurements of 8 different low earth orbit satellites. The results show that the accuracy of real-time orbit determination improves greatly with GRAPHIC measurements. The position accuracy is 0.44-055 m and the velocity is 0.37-0.63 mm/s. The accuracy improvement is about 40% compared to the traditional dual-frequency pseudo-range real-time orbit determination method. We believe that with the real-time orbit determination algorithm mentioned in this paper, high precise orbit determination results can be achieved with low-cost single-frequency GPS receiver.
