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首页> 外文会议>Gravity, Geoid and Space Missions: GGSM 2004; International Association of Geodesy Symposia; vol.129 >A Preliminary Gravitational Model to Degree 2160
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A Preliminary Gravitational Model to Degree 2160

机译：2160级引力模型

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The National Geospatial-Intelligence Agency (NGA) of the USA has embarked upon the development of a new Earth Gravitational Model (EGM), to support future realizations of NGA's World Geodetic System. Current plans call for the development of the new EGM (EGM05) by the end of 2005. The new model will be complete to degree and order 2160, and aims at a ±15 cm global Root Mean Square (RMS) geoid undulation error requirement. The new model will combine optimally the gravitational information that is extracted from dedicated geopotential mapping satellite missions (CHAMP, GRACE), with the information contained within a global gravity anomaly database of 5' x 5' resolution. This paper describes the development of a Preliminary Gravitational Model (PGM2004A). We developed PGM2004A by combining the GRACE-only model GGM02S, with a 5' x 5' global gravity anomaly database compiled by NGA. PGM2004A is complete to degree and order 2160, and is accompanied by propagated error maps at 5' x 5' resolution, accounting for the entire bandwidth of the model (from degree 2 to degree 2160), for various model-derived gravimetric quantities (Δg, N, ξ, η). We have evaluated PGM2004A through comparisons with independent data including GPS/Leveling data, astronomic deflections of the vertical over the conterminous US (CONUS), and altimeter data from TOPEX. The results of these comparisons indicate that the goal set for EGM05 is well within reach. We summarize in this paper our current status and technical accomplishments, and discuss briefly our next steps towards the development of EGM05.
机译：美国国家地理空间情报局（NGA）已着手开发新的地球引力模型（EGM），以支持NGA的世界大地测量系统的未来实现。当前的计划要求在2005年底之前开发新的EGM（EGM05）。新模型的完成度和阶数为2160，目标是±15 cm全球均方根（RMS）大地水准面波动误差要求。新模型将最佳地结合从专用地势测绘卫星任务（CHAMP，GRACE）中提取的重力信息，以及包含在5'x 5'分辨率的全球重力异常数据库中的信息。本文介绍了引力模型（PGM2004A）的开发。我们通过将仅GRACE模型GGM02S与NGA编译的5'x 5'全球重力异常数据库相结合，开发了PGM2004A。 PGM2004A的阶次和阶次是完整的2160，并伴随着5'x 5'分辨率的传播误差图，说明了模型得出的各种重量（Δg）的整个模型带宽（从阶次2到阶次2160）。 ，N，ξ，η）。我们通过与独立数据进行比较，对PGM2004A进行了评估，这些数据包括GPS /水准仪数据，美国本土（CONUS）垂直线的天文变形以及TOPEX的高度计数据。这些比较的结果表明，为EGM05设定的目标完全可以实现。我们在本文中总结了我们的现状和技术成就，并简要讨论了我们朝EGM05的发展迈出的下一步。

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