北斗卫星天线相位中心改正模型精化及对精密定轨和定位影响分析

Refinement of BeiDou satellite antenna phase center correction model and its impact on precision orbit determination and positioning

针对BDS-2和BDS-3卫星联合精密定轨和精密定位中高精度BDS-2 IGSO/MEO卫星天线相位中心改正在轨估计模型的缺失问题,本文采用了改进的PCV和z-offset参数估计方法,精化了BDS-2 IGSO/MEO卫星B1I/B3I无电离层组合PCC模型。数值验证结果表明:相比北斗官方发布的PCO地面标定值,本文精化的PCC模型使得精密轨道SLR残差的STD减小了0.6~2.4 cm,改善百分比为8.6%~33.3%;基于本文精化的BDS-2和已有BDS-3卫星精化的PCC模型使得精密定位浮点解在高程方向显著提升了9.5 mm(37.2%)。

Aiming at the lack of high accurate antenna phase correction(PCC)model for the BDS-2 IGSO and MEO satellites,in the BDS-2 and BDS-3 satellites joint precision orbit determination(POD)and precise point positioning(PPP),in this paper,an improved method for estimating PCV and z-offset parameters is used to refine the B1I/B3I ionosphere-free linear combination PCC model for the BDS-2 IGSO and MEO satellites.Compared with the results obtained using the ground-calibrated PCO model published by BeiDou official,the STD of SLR residuals obtained by the POD using the refined PCC model is reduced by 0.6~2.4 cm,and the improvement percentage is about 8.6%~33.3%.The floating PPP solution results,based on the refined BDS-2 satellite PCC model in this paper and the existing BDS-3 PCC model,have been significantly improved by 9.5 mm(37.2%)in the elevation direction.