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Effect of satellite attitude quaternions on BeiDou precise point positioning during the eclipse season
LIU Tianjun, CHEN Qusen, JIANG Weiping, CHEN Hua, XIA Fengyu, FAN Caoming
Acta Geodaetica et Cartographica Sinica
2023, 52 (4):
550-558.
DOI: 10.11947/j.AGCS.2023.20220245
In order to obtain high-precision positioning, precise point positioning (PPP) user side should keep the the consistent satellite attitude model with analysis centers. Based on the satellite attitude quaternions products provided by the Wuhan university analysis centers (WUM), we introduce the yaw angle computation method that uses satellite attitude quaternions. When the BDS-2/BDS-3 satellite is at a low sun elevation angle, the satellite attitude model strategy of WUM is analyzed. By using the open-source positioning software GAMP, the BDS-2/BDS-3 PPP solutions are also investigated with different satellite attitude strategies. During the deep eclipse season, the results demonstrate that the differences between nominal and quaternion yaw angles can reach 360°, which can cause the decimeter-level biases in the phase wind-up and antenna phase center offset correction. In this period, compared with the nominal attitude, the positioning accuracy of PPP solutions with satellite attitude quaternions can be improved approximately 32%, 29% and 38% in the earth (E), north (N) and up (U) components, respectively. Furthermore, the positioning accuracy of PPP solutions with satellite attitude quaternions can be improved approximately 29%,25% and 28%in the E, N and U components, respectively, when compared to that of the deleting the eclipsing satellite strategy(deleting satellite at the farthest and closest point of the orbit). The inconsistent attitude models would reduce the reliability of PPP positioning results, so the satellite attitude quaternions that provided from the analysis centers should be used for phase wind-up and antenna phase center offset correction in the PPP user side.
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