Beidou Precise Ephemeris Analysis Based on Cubic Spline Interpolation Method
ZHAO Changchun
YAO Jinjie
Abstract：How to improve the accuracy of satellite positioning is an important research problem at present,and the precise ephemeris plays a crucial role in the process of high precision satellite positioning.In the previous studies,the position coordinates of navigation satellites in precise ephemeris are directly interpolated,and the interpolation calculation conditions are relatively sim-ple.In order to further improve the accuracy of precision ephemeris interpolation,this paper proposes an interpolation method using satellite velocity as interpolation boundary conditions,and uses cubic spline interpolation method to calculate precision ephemeris data at different time periods.The experimental results show that the precision of the cubic spline interpolation method for precise ephemeris is about one order of magnitude higher than that of the previous one,and the minimum accuracy is maintained at the milli-meter level even when the position data changes greatly.This paper enriches the methods and ideas of interpolation calculation and analysis of precision ephemeris,which is of great significance to improve the precision of post-processing precision single point posi-tioning.
Keywords：precise ephemeriscubic spline interpolationprecision analysisBDS
Publication Date：2023-10-20
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 67-71 )