Abstract:Based on the analysis of the orbit characteristics of more than ten low-orbit satellites, such as GRACE and SWARM, we analyze the sampling interval and interpolation methods of the precise ephemeris for the low-orbit satellites. We design two precise ephemeris schemes: efficiency first and precision first, according to the user’s requirement. The experimental results show that the orbit height of low-orbit satellites has a significant influence on the sampling interval and interpolation methods. In view of the accuracy requirements of 3 cm and 10 cm orbits, the storage space occupied by ephemeris files can be compressed by more than 99% through reasonable orbit design.