基于拉格朗日与切比雪夫方法的精密星历插值研究

摘要

采用拉格朗日方法和切比雪夫方法对间隔为15min的精密星历进行内插或拟合，将结果和原始星历进行比较，得到内插拟合的精度。详细分析了在不同阶数时的两种方法各自的精度，比较了它们的优劣。%This paper introduces how to interpolate or fit precise ephemeris provided by IGS using Lagrange method and Chebyshev method and then respectively compares the outcomes with original ephemeris getting precision of this two algorithms .We analyze preci-sions at different orders for both methods according to which we can choose the most appropriate order .