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首页> 外文会议>Proceedings of 4th international GOCE User workshop. >GOCE GRAVITY GRADIENTS: A NEW SATELLITE OBSERVABLE
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GOCE GRAVITY GRADIENTS: A NEW SATELLITE OBSERVABLE

机译：重力梯度：可观测的新卫星

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The Gravity field and steady-state Ocean CirculationrnExplorer (GOCE) is one of the flagships in ESA’s LivingrnPlanet Programme. With the help of the on-board, veryrnprecise gravitational gradiometer the Earth’s gravity fieldrnis to be determined with unprecedented accuracy. Therngradiometer measures gravity field differences that arerncontained in six gravity gradient (GG) tensor components.rnBecause of the instrument characteristics, fourrnout of six tensor elements are very accurate, whereas thernother two are less accurate.rnWe will concentrate on the noise characteristics of thernaccurate GGs by a spectral analysis of the residuals ofrna semi-analytical gravity field solution for the first measurementrnphase (November - December 2009). Formalrnerrors of spherical harmonic coefficients are estimated inrna semi-analytical way by means of a GOCE combinedrngravity field solution. In addition they are then comparedrnwith formal errors of recent GOCE-only models.rnAs in the measured GG tensor there are two less accuraterncomponents the rotation of the GG tensor from therninstrument frame to a local Earth related frame is notrnstraightforward. A possible solution is to replace thernless accurate components with model gradients. We willrndiscuss the trade-off between measured and model GGsrnand assess the information content of the rotated gradientsrnin different local frames, specifically the local northorientedrnframe and the local orbital frame.rnFurthermore we will present a quality assessment of thernGOCE GGs over time. We will show that the errors ofrnV_(xx) and V_(xz) are constant over time, but that the errors inrnV_(yy) increase after each calibration event, which is due torna drift in the differential scale factor associated with V_(yy).rnFinally, the V_(zz) error level seems to have decreased byrn25% after the switch from CPU A to B in February 2010.
机译：重力场和稳态海洋环流探测器（GOCE）是ESA的LivingrnPlanet计划的旗舰产品之一。借助机载非常精确的重力梯度仪，可以前所未有的精度确定地球的重力场。辐射计测量的重力场差包含在六个重力梯度（GG）张量分量中。rn由于仪器的特性，六个张量元素的四个十分精确，而另外两个张量元素的准确性较差.rn我们将通过以下方法集中研究精确的GGs的噪声特征对第一个测量相位（2009年11月-2009年12月）的rna半解析重力场解决方案的残差进行频谱分析。球面谐波系数的形式误差是通过GOCE组合重力场解法半解析估计的。另外，然后将它们与最新的仅GOCE模型的形式误差进行比较。在所测量的GG张量中，有两个精度较差的分量，GG张量从仪器框架向与地球相关的局部框架的旋转不是直接的。一种可能的解决方案是用模型梯度替换无缝的精确分量。我们将讨论被测GGs模型和模型GGsrn之间的权衡，并评估不同局部框架（特别是局部北向框架和局部轨道框架）中旋转梯度的信息内容。此外，我们还将对GOCE GGs进行质量评估。我们将显示rnV_（xx）和V_（xz）的误差随时间变化是恒定的，但是误差inrnV_（yy）在每次校准事件之后都会增加，这是由于与V_（yy）相关的微分比例因子中的色差漂移最后，在2010年2月从CPU A切换到B之后，V_（zz）错误级别似乎降低了rn25％。

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