BDS-3 MEO卫星偏航姿态对PPP的影响

系统比较深地影期间BDS-3 SECM和CAST MEO卫星采用公开的偏航姿态模型计算的模型姿态与名义姿态的差异，首次评估其对天线相位缠绕和相位中心等几何误差的改正及PPP结果的影响。结果表明，对于机动期间的BDS-3 MEO卫星，采用名义姿态会导致CAST 和SECM 卫星的天线相位中心改正误差分别达0.2 m和0.02 m, 相位缠绕改正误差达0.1～0.2周。由于卫星机动时间较短以及观测几何构型较强，与模型姿态相比，名义姿态的使用并不会引起PPP结果显著下降。

Impact of Yaw Attitude of BDS-3 MEOs on PPP Performance

We systematically compare the differences between the modeled attitude and nominal attitude derived by the published yaw attitude models for BDS-3 SECM and CAST MEOs during deep eclipse seasons, and evaluate its influence on the calculation of antenna phase wind-up and phase center offsets(PCO) and PPP performance for the first time. The research shows that, for BDS-3 MEOs during maneuvers, adopting nominal attitude will cause the PCO correction errors for CAST and SECM satellites to reach 0.2 m and 0.02 m, respectively, and the wind-up correction errors to reach 0.1-0.2 cycles. Due to the shorter duration of satellite maneuvers and stronger geometric strength, compared with the modeled attitude, the use of the nominal attitude will not cause a significant drop in the PPP results.