Downward Continuation of Satellite Gravity Gradient Data Based on Poisson Integral Iteration Method

Downward continuation is one of the vital steps in pre-processing of satellite gravity gradient (SGG) data when recovering the earth gravity field by space-wise method. Mathematic downward continuation model of the SGG data based on Poisson integral iteration method was constructed, of which the downward continuation effects based on ‘Direct’ and ‘Remove-Restore’ schemes were analyzed and discussed with simulated SGG data. Results show that the precision of ‘Remove- Restore’ scheme is better than that of the ‘Direct’ scheme at the height of both 5 kilometers and 250 kilometers, i.e., the ‘Remove- Restore’ technique could improve the precision of downward continuation results based on Poisson integral iteration method in a certain degree.