A study on polynomial fitting of computing space disturbing gravity with point-mass model

By the analysis of each frequency space disturbing gravity vector results computed with point-mass model,this paper proposes a polynomial fitting approach method to substitute the point-mass model method.With comparing and analyzing the results between polynomial fitting model and point-mass model,the degree of each frequency polynomial function is confirmed and the subsection polynomial function model is established.The polynomial function model's form is simple,can reflect the frequency characteristics of space disturbing gravity,and is favorable to speed computing the space disturbing gravity.