资源三号01星GPS天线相位中心变化在轨估计及对精密定轨的影响

利用资源三号01星（ZY3-01）实测GPS数据，基于简化动力学定轨方法和残差法估计该星GPS天线的在轨相位中心变化（phase center variation，PCV）模型，并分析该星PCV对精密定轨的影响。实验表明，通过考虑PCV模型，ZY3-01星定轨结果在重叠弧段对比上，三维位置RMS值有4.5 mm的精度提升，SLR检核RMS值有1.2 mm的精度提升，且各SLR测站检核结果也均有不同程度的精度提升。

Phase Center Variations Estimation In-Flight for ZY3-01 GPS Antenna and Its Influence on the Precision Orbit Determination

Receiver antenna phase center variation is one of important error sources influencing the precision orbit determination of low earth orbit satellites. In this paper, based on the GPS data of ZY3-01 star, the PCV models are estimated using the reduced-dynamic method and the residual method, and the influence of PCV on the precision orbit determination is analyzed. After using the PCV model, 3D accuracy in overlapping arcs comparison can increase 4.5mm, and SLR residual can increase 1.2 mm. All SLR station checking results also increase.