基于星载GPS的资源三号卫星精密定轨

Precise Orbit Determination for the ZY-3 Satellite Mission Using GPS Receiver

资源三号卫星是我国首颗民用立体测图卫星,于2012年1月9日发射。卫星上配备有国产双频GPS接收机。利用非差双频GPS数据,基于卫星动力学原理和事后批处理定轨模式,采用30小时弧段(重叠弧长为6小时)对资源三号卫星进行了精密定轨,卫星位置重叠弧段精度平均为4.95cm。利用卫星激光测距(SLR)观测数据对星载GPS定轨结果进行了检核,检核精度优于4cm,无明显系统偏差。结果表明,该定轨精度完全能够满足资源三号卫星任务的要求。

The ZY-3 satellite launched on January 9, 2012, is China＇ s first civilian mapping satellite. The satellite is equipped with GPS double frequency receivers made in China. Based on the satellite dynamics principle and the batch processing mode, the orbit of ZYJ3 satellite are determined from zero-difference GPS measurements by use of the reduced dynamics methods in this article. The data arc length is 30h, with overlaps of 6 hours. The result reveals that the orbit determination accuracy of overlapping arcs is around 5 era. Compared with SLR data, the distance biases between the satellite and SLR stations are about 4cm excluding the station system bias. So, the ZY-3 satellite orbit determination accuracy can meet the satellite mission requirement.