Keywords Satellite-to-Satellite Tracking;Global Geopotenial Model;Energy Conservation Method;Variational Equations;Numerical Integration;Parallel Computing;CHAMP;GRACE;GOCE;

• 卫星跟踪卫星;全球重力位模型;能量守恒法;变分方程;数值积分;并行计算;CHAMP;GRACE;GOCE;