基于星载GPS数据的HY-2B卫星简化动力学精密定轨

Simplified dynamic precision orbit determination of HY-2B satellites based on spaceborne GPS data

为研究满足HY-2B星载GPS定轨要求的EGM2008重力场模型合理阶次和HY-2B卫星简化动力学定轨精度,采用HY-2B卫星14天星载GPS观测数据及不同阶次EGM2008重力场,进行简化动力学轨道确定。结果表明:采用120阶及以上阶次的EGM2008重力场模型,能够获得厘米级高精度定轨结果。同时,检核结果显示:采用简化动力学法定轨时,载波相位残差结果稳定在6.2~6.8mm之间,重叠轨道对比结果在轨道径向、切向、法向上均优于0.6cm,SLR检核整体轨道精度优于4cm。定轨结果满足测高卫星需求,可为后续我国海洋系列卫星精密轨道确定等相关科学研究提供借鉴。

In order to study the reasonable order of EGM2008 gravity field model that meets the requirements of HY-2B spaceborne GPS orbit determination and the simplified dynamic orbit determination accuracy of HY-2B satellites,this paper uses the 14-day spaceborne GPS observation data of HY-2B satellites and EGM2008 gravity fields of diferent orders to simplify dynamic orbit determination.The results show that the EGM2008 gravity field model of order 120 and above can obtain high-precision orbit determination results.At the same time,the inspection results show that the carrier phase residual results in the simplified kinetic legal orbit are stable between 6.2~6.8 mm,the overlapping track comparison results are better than 1cm in the orbital radial,tangential and normal directions,and the overall orbital accuracy of the SLR inspection results is better than 4 cm.The orbit determination results meet the needs of altimetry satellites,and can provide reference for subsequent scientific research on precision orbit determination of China's marine series satellites.