The characteristics of the normal equation created in recovering the earth gravity model (EGM) by least-squares (LS) adjustment from the in-situ disturbing potential has been discussed in detail.

• 摘要讨论了在基于能量法确定地球重力场模型的过程中，利用最小二乘方法由沿轨扰动位数据解算位系数时法方程的特性，在该问题中，法方程只与卫星轨道有关。