中文摘要：

针对海洋2A（HY2A）卫星快速精密定轨的需求,本文基于非差动力学方法,利用国际GNSS服务组织（IGS）和上海天文台GNSS数据处理中心（SHA）提供的超快速星历产品IGU和SHU,对HY2A卫星进行快速精密定轨研究。计算结果表明,以法国国家空间研究中心（CNES）提供的精密轨道作为参考轨道,联合超快速星历SHU和IGU的预报星历,可以确定径向厘米级精度的快速轨道。同时利用卫星激光测距（SLR）数据检核快速精密轨道,得到SHU和IGU预报星历确定的快速精密轨道站星距方向残差的RMS分别为2.9和4.8cm。可见,利用SHU和IGU预报星历组合可以得到厘米级的快速精密轨道,对HY2A卫星的海洋环境监测和海洋灾害预警具有一定应用价值。

英文摘要：

Based on zero-difference dynamics method by using ultra-rapid ephemeris products IGU offered by the International GNSS Service Organizations（ IGS） and SHU offered by the GNSS Data Analysis Center of Shanghai Astronomical Observatory（ SHAO）,the study of rapid precise orbit determination for satellite HY2 A is carried out to satisfy the relevant requirements. The results show that,compared with the reference precise orbit provided by the French Centre National d＇Etudes Spatiales（ CNES）,the rapid orbit with centimeter-level radial accuracy can be achieved by using the combination of ultra-rapid SHU and IGU predicted ephemeris products. At the same time,the satellite laser ranging（ SLR）validation shows the orbit RMS of SHU and IGU predicted ephemeris along the station-satellite direction is 2. 9cm and 4.8cm respectively. In conclusion, it is possible to obtain rapid orbits with centimeter-level precision by using the combination of SHU and IGU predicted ephemeris products. This demonstrates the application prospects of HY2 A for oceanic environmental monitoring and hazard early-warning.