2011年8月16日发射的海洋环境动力（海洋二号）卫星是中国第一颗动力环境卫星，其中搭载的雷达高度计需要连续的厘米级海洋地形测量，轨道误差在雷达高度计整体误差预算中占主要部分，为实现海洋二号卫星精密定轨事后处理径向10 cm精度的研制总要求，海洋二号卫星搭载了多普勒地球轨道和无线电定位系统（DORIS）接收机、双频全球定位系统（GPS）接收机和激光反射棱镜阵列用于精密定轨。本文综述了海洋二号卫星精密定轨方案设计和关键技术，给出了在轨测试结果。

The HY-2A satellite, launched on October 16, 2011 is the first dynamic environments satellite in China, carrying the radar altimeter which continues the time series of centimeter lever ocean topography measurement. Orbit error is a major component in the overall error budge of all altimeter satellite missions. The HY-2A satellite carries DORIS deceiver, Dual frequency GPS receiver and Laser Retroreflector Array for Precise orbit determination (POD) to meet 10cm radial accuracy goal for the HY-2A satellite radar altimeter. First, the tracking system and method of POD for HY-2A satellite is introduced, then the solution strategy is showed, finally the results of the radial accuracy for HY-2A satellite are given in this paper.