海洋二号A与资源三号卫星星载GPS自主轨道确定

系统研究了基于海洋二号A（HY2A）与资源三号（ZY3）卫星国产星载GPS接收机双频数据的自主定轨问题，模拟在轨实时处理的结果表明，HY2A与ZY3卫星伪距自主定轨的位置精度可达1.3 m，速度精度可达1.2 mm/s；而HY2A卫星相位自主定轨位置精度可达38 cm，其中径向精度约10 cm，速度精度可达0.36 mm/s；ZY3卫星相位定轨位置精度可达54 cm，速度精度可达0.54 mm/s。自主定轨的相关成果可以应用于我国后续对地观测计划的实时服务。

Autonomous Orbit Determination of HY2A and ZY3 Missions Using Space-borne GPS Measurements

This paper studied the determination of autonomous orbits of HY2A and ZY3 missions using on-board GPS data. A simulative on-board processing of real-time orbit determination was carried out using the space-borne GPS dual frequency pseudo-range and phase measurements with the auto-developed software SATODS. The test demonstrates that, based on pseudo-rang data, the position and velocity error (3D RMS) of orbit results are up to 1.3 m and 1.2 mm/s respectively, but with phase data, they are reduced to 38cm and 0.36 mm/s for HY2A mission, where the radial accuracy is about 10 cm, and decreased to 54 cm and 0.54 mm/s for ZY3 mission. These contributions can be used for certain real-time service of continued low-earth orbiters (LEO) for earth observations.