中文摘要：

低轨卫星精密定轨技术极大地受益于GPS的连续三维定位功能和IGS等机构提供的高精度轨道与钟差产品。反过来，低轨卫星也可视为运动的监测站，星载GPS数据也可用于确定GPS卫星轨道。我们的SPODS软件已经具备了融合处理低轨卫星星载数据和地面监测站数据进行导航卫星精密定轨的能力。利用IGS跟踪站数据和GRACE-B卫星星载GPS数据进行联合定轨实验，结果表明，在20个地面监测站的情况下，增加一颗低轨卫星（GRACE-B）星载数据，GPS卫星径向、迹向和法向的轨道精度分别提高约12％、25％和23％，其中在迹向和法向的精度还略优于40个地面站的结果。

英文摘要：

The technology of precise orbit determination for LEO satellites have been benefitting from the continuous three - dimensional coverage offered by GPS and the precise GPS ephemeris and clock products offered by the International GNSS Service （ IGS）. In return, the LEO orbiters equipped with GPS receiver can be treated as dynamic tracking stations , and can be used for orbit determination for GPS satellites. The SPODS has now achieved the ability to recover the orbit of GPS satellites by integrating the data from ground tracking stations and LEO orbiters. Experiments with GPS data from IGS tracking stations and GRACE - B were carried out. It＇ s shown that, by adding space - borne data of one LEO （ GRACE - B ）, the accuracy of GPS orbits with data from 20 IGS tracking stations were greatly improved by about 12% ,25% and 23% respectively in RTN components, compared with IGS final orbits. And the accuracy in T and N components is even slightly better than the case with data of 40 tracking stations.