导航卫星自主定轨中JPL DE星历的简化及应用研究

SIMPLIFICATION OF JPL'S DE AND ITS APPLICATION ON AUTONOMOUS ORBIT DETERMINATION OF GLOBAL NAVIGATION CONSTELLATION

根据JPL DE系列星历的存储结构,提出了适用于导航卫星自主定轨算法的DE星历数据的简化措施。经过简化处理后,20年的DE406星历数据量仅为369 kb,是简化前的1/6。以GPS卫星为对象,用简化的DE星历参与长时间的轨道预报试验,结果表明:60天的轨道法向的最大预报误差仅为3 m。该简化措施在保证导航卫星自主定轨算法的定轨精度的基础上,可大幅减小星上数据的存储空间,提高自主定轨算法的运行效率。

According to the data structure of JPL＇ s Development Ephemeris （DE） series, a simplified method is presented to facilitate the computation of autonomous orbit determination onboard GNSS satellite. The storage size of DE406 ephemeris in a period of 20 years is reduced to 369kb with this method. This simplified DE406 is verified with an experiment of long-term orbit integration of GPS satellites. The results show that the maximum prediction er- ror in the normal direction is less than 3.0 meters during 60 days. This simplified method could not only ensure the accuracy and computational efficiency of autonomous orbit determination algorithm, but also decrease the data stor- age space onboard GNSS satellite.