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首页> 外文会议>Gravity, Geoid and Space Missions: GGSM 2004; International Association of Geodesy Symposia; vol.129 >Upward Continuation of Ground Data for GOCE Calibration/Validation Purposes
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Upward Continuation of Ground Data for GOCE Calibration/Validation Purposes

机译：用于GOCE校准/验证目的的地面数据的向上延续

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摘要

With the upcoming ESA satellite mission GOCE, gravitational gradients (2nd derivatives of the Earth's gravitational potential) will be measured globally, except for the polar gaps. An accuracy of a few mE (1 mE = 10~(-3) Eoetvoes, 1 E = 10~(-9)s~(-2)) is required to derive, in combination with satellite-to-satellite tracking (SST) measurements, a global geopotential model up to about spherical harmonic degree 200 with an accuracy of 1... 2 cm in terms of geoid undulations and 1 mgal for gravity anomalies, respectively. To meet these requirements, the gradiometer will be calibrated and validated internally as well as externally. One strategy for an external calibration or validation includes the use of ground data upward continued to satellite altitude. This strategy can only be applied regionally, because sufficiently accurate ground data are only available for selected areas. In this study, gravity anomalies over Europe are upward continued to gravitational gradients at GOCE altitude. The computations are done with synthetic data in a closed-loop simulation. Two upward continuation methods are considered, namely least-squares collocation and integral formulas based on the spectral combination technique. Both methods are described and the results are compared numerically with the ground-truth data.
机译：随着即将到来的ESA卫星任务GOCE，将全球测量引力梯度（地球引力的二阶导数），但极差除外。结合卫星到卫星跟踪（SST），需要几mE的精度（1 mE = 10〜（-3）Eoetvoes，1 E = 10〜（-9）s〜（-2））。 ）测量，一个高达大约球谐度200的全局地球电势模型，在大地水准面波动方面的精度分别为1 ... 2 cm，重力异常的精度为1 mgal。为了满足这些要求，梯度仪将在内部和外部进行校准和验证。外部校准或验证的一种策略包括使用持续到卫星高度的地面数据。该策略只能在区域内应用，因为足够准确的地面数据仅可用于所选区域。在这项研究中，欧洲的重力异常在GOCE高度继续上升到重力梯度。在闭环仿真中使用合成数据进行计算。考虑了两种向上连续方法，即最小二乘配置和基于谱组合技术的积分公式。描述了这两种方法，并将结果与​​真实数据进行了数值比较。

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