A study of the EGM2008 model of Earth's gravitational field

IF 1.9 4区工程技术 Q2 ENGINEERING, MARINE

Journal of Navigation Pub Date : 2022-09-01 DOI:10.1017/S0373463322000480

Don Koks

引用次数: 0

Abstract

Abstract The Earth Gravity Model 2008 (EGM2008) is now some years old, and yet information on how to use it to calculate Earth's gravity remains obscure outside the field of geodesy. We describe the mathematics necessary to implement EGM2008, and use this to discuss several points of the model: its sensitivity to the number of spherical harmonics being summed, nuances and a trap for physicists and mathematicians in the normalisation it uses, and a comparison with other work. We conclude that one must not overestimate the precision shown by a global-fit model such as EGM2008.

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地球引力场的EGM2008模型研究

摘要2008年地球重力模型（EGM2008）已经有几年的历史了，但关于如何使用它来计算地球重力的信息在大地测量领域之外仍然模糊不清。我们描述了实现EGM2008所需的数学，并用它来讨论该模型的几个要点：它对被求和的球面谐波数量的敏感性，物理学家和数学家在使用归一化时的细微差别和陷阱，以及与其他工作的比较。我们得出的结论是，不能高估像EGM2008这样的全局拟合模型所显示的精度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Navigation 工程技术-工程：海洋

CiteScore

6.10

自引率

4.20%

发文量

审稿时长

4.6 months

期刊介绍： The Journal of Navigation contains original papers on the science of navigation by man and animals over land and sea and through air and space, including a selection of papers presented at meetings of the Institute and other organisations associated with navigation. Papers cover every aspect of navigation, from the highly technical to the descriptive and historical. Subjects include electronics, astronomy, mathematics, cartography, command and control, psychology and zoology, operational research, risk analysis, theoretical physics, operation in hostile environments, instrumentation, ergonomics, financial planning and law. The journal also publishes selected papers and reports from the Institute’s special interest groups. Contributions come from all parts of the world.