为了更精确地考虑地球对超远程弹道计算的影响，提出了一个计入精确正常重力的椭球地表弹道模型。
To consider the effect of the earth on the calculation of ultra range trajectory more accurately, an elliptic earth trajectory model adopting accurate normal gravity is established.
给定参考椭球体的四个基本参数，椭球体产生的外部正常重力位场可利用传统方法确定。
Given four basic parameters of a reference ellipsoid, the normal potential field generated by the ellipsoid could be determined by using conventional method.
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