Rapidly Computing Satellite Gravity Gradient Observations Along Orbit from Gravity Field Model

The direct computation with the high-degree gravity field model is time-consuming.We studied a method of fast simulation of GOCE satellite gravity gradient observations along the orbit with high-degree gravity field model.We proposed a method,which uses the gridding data from the gravity field model on the different height spherical surfaces to interpolate the points along the orbit.The numerical analysis results based on the comparison between the interpolated values and the ones from the direct evaluation with the spherical series expansion show that this method is rapid and valid.