Method for downward continuation of gravity and magnetic data based on pade approximation

摘要

The invention provides a method for downward continuation of gravity and magnetic data based on Pade approximation. The method comprises calculating S11 different orders of vertical derivatives of gravity and magnetic data by integrated second vertical derivatives (ISVD). Next, a coefficient equation of Pade approximation is calculated S12 by means of the different orders of vertical derivatives, and coefficients of the coefficient equation are resolved. Finally, the resolved coefficients are substituted S13 into Pade approximation to calculate a downward continuation result of the gravity and magnetic data.