BDS精密星历插值计算分析

Calculation and analysis of BDS precise ephemeris interpolation

针对北斗卫星导航系统空间星座的多样性和定轨精度的差异性,介绍两种严密的数学插值方法分别对三种不同轨道卫星的精密星历进行插值计算。通过选取不同的插值阶数,将插值计算结果进行统计分析。结果表明:在选取合适的插值阶数后,两种方法均能有效地实现BDS三种不同轨道卫星精密星历的插值,且精度皆能达到毫米级。

Aiming at the diversity of space constellations and the difference of orbit determination accuracy of BeiDou Navigation Satellite System,two rigorous mathematical interpolation methods are introduced to interpolate the precise ephemeris of three kinds of satellites in different orbits.By selecting different interpolation degrees,the interpolation results are statistically analyzed.The results show that after selecting the appropriate interpolation degrees,the two methods can effectively interpolate the precise ephemeris of three kinds of BeiDou satellites in different orbits,and the accuracy can reach the millimeter level.