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中文摘要：
给出了利用地球重力场模型计算扰动引力以及重力场模型截断误差的公式,计算了36阶、360阶、2 160阶地球重力场模型在径向和水平方向的截断误差,并对36阶、360阶的EGM96和EGM2008重力场模型计算的弹道扰动引力矢量进行了分析和比较。结果表明,采用重力场模型计算扰动引力时,模型阶数和弹道点的高度越低,模型截断误差越大;EGM96和EGM2008模型的一致性随着模型阶数的升高而逐渐降低。总体来看,EGM2008模型的精度要好于EGM96模型。
英文摘要：
The formulas which are used to calculate the disturbing gravity and the model truncation error are given, and the truncation errors of the Earth gravity field models of 36 degree ,360 degree, and 2 160 degree are calculated in the radial and horizontal directions, and the trajectory disturbing gravity vectors, which are calculated with the Earth gravity field models of EGM96 and EGM2008 of 36 degree and 360 degree, are analyzed and compared. The results show that when using the Earth gravity field model to calculate the trajectory disturbing gravity, the lower the model degree and the trajectory points height are, the bigger the model truncation errors are;the coherence of EGM96 and EGM2008 is gradually descending along with the model degree rising. As a whole, the accuracy of EGM2008 is better than that of EGM96.
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