A new interpolation method based on satellite physical character in using IGS precise ephemeris

Abstract

Due to the deficiency of sliding Lagrange polynomial interpolation, the author proposes a new interpolation method, which considers the physical character of satellite movement in coordinate transformation and reasonable selection of interpolation function. Precision of the two methods is compared by a numerical example. The result shows that the new method is superior to the sliding Lagrange polynomial interpolation in interpolation and extrapolation, especially in extrapolation that is over short time spans.

Keywords

• precise ephemeris
• interpolation
• trigonometric interpolation
• coordinate transformation
• physical character