COMPARISON OF INTERPOLATING AND FITTING IGS PRECISE EPHEMERIS
IGS精密星历内插与拟合法精度的比较

The principles of Lagrange interpolation,Neville interpolation,Chebyshev polynomial fitting and Legendre polynomial fitting were analysized compared with each other.The results indicate that the best orders of interpolating algorithm and fitting algorithm are 8 and 9 respecdively and each algorithm has the same accuracy when their orders are the same.Besides,the stage of epoch which fitting algorithm is suitable to is longer than that for interpolating algorithm in the same order.