Accuracy Analysis and Calculation of 1°×1° Point Masses in the Area of China

Through the analyses of anomalies relativity,the approximation effects of surface gravity field and the numerical stability of calculation,the datum configuration of the disturbing point masses model is discussed in this paper.Then,in an effort to optimize model configuration,a new method of creating fictitious point masses by way of moving window control is proposed.On this basis,the successive over-relaxation(SOR) iterative method is introduced to solve the equation of boundary value condition which has been optimized to be a sparse matrix.And the method is used to calculate the 1°×1°point masses in the area of China(0°~60°N;70°E~140°E).Finally,the computation results are analysed and checked.It is proved that the optimization of datum configuration by way of moving window control has many advantages.