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首页> 外文会议>Proceedings of 4th international GOCE User workshop. >VALIDATION OF GOCE GRAVITY FIELD MODELS BY ASTROGEODETIC VERTICAL DEFLECTIONS IN GERMANY
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VALIDATION OF GOCE GRAVITY FIELD MODELS BY ASTROGEODETIC VERTICAL DEFLECTIONS IN GERMANY

机译：通过德国大地大地垂直偏转验证GOCE重力场模型

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摘要

The validation of GOCE products is one of the mainrnobjectives within the framework of the German REALrnGOCE project. Within the work package “GOCErnCal/Val, Quasigeoid and Height System”, global gravityrnfield models are evaluated by various terrestrial datarnsets in Germany. In this contribution, the focus is on thernevaluation of global gravity field models by means ofrnastrogeodetic vertical deflections observed with therndigital transportable zenith camera system TZK2-D inrnGermany.rnThe terrestrial data set comprises approx. 300 verticalrndeflections along a North-South and a West-Eastrnprofile. Regarding accuracy (standard deviation of 0.1"),rndimension (profile lengths of 500 km) and resolutionrn(station spacings of 2.5 to 5 km), the astrogeodeticrnvertical deflections are well applicable for a spot checkrnof global gravity field models. In connection with arnmultistage filtering process, accounting for the differentrnspectral content of the different data sets, the comparisonsrnare performed, meeting the accuracy requirementsrnof the GOCE mission.rnThe analyses are carried out with actual global gravityrnfield models from GOCE data, GRACE data and fromrncombination solutions of GOCE and GRACE as well asrnfrom GRACE and terrestrial data. The first generationrnof GOCE models, based on an observation period ofrnapprox. 2 months, already reveal a considerablernimprovement within the spectral range between degreernand order 150 and 180 over the GRACE models. For thernsecond generation GOCE models, based on a longerrnobservation period of approx. 8 months, a furtherrnsignificant improvement within the spectral range up torndegree and order 224 can be stated. For higher degreesrnup to 250, however, the quality of the GOCE modelsrnstill degrades with respect to the combined models fromrnGRACE and terrestrial data.
机译：GOCE产品的验证是德国REALrnGOCE项目框架内的主要目标之一。在“ GOCErnCal / Val，拟类星体和高度系统”工作包中，全球重力场模型由德国的各种地面数据集进行评估。在这项贡献中，重点是通过数字可移动天顶摄像机系统TZK2-D iner德国观察到的地磁垂直偏转对全球重力场模型进行的重新评估。沿北-南和西-东剖面的300个垂直挠度。关于精度（标准偏差为0.1英寸），尺寸（轮廓长度为500 km）和分辨率rn（测站间距为2.5至5 km），星形大地垂直偏转非常适用于点检核全球重力场模型。在处理过程中，考虑了不同数据集的不同光谱内容，进行了比较，满足了GOCE任务的精度要求。rn使用GOCE数据，GRACE数据以及GOCE和GRACE的组合解决方案中的实际全局重力场模型进行了分析。根据GRACE和地面数据，第一代rnof GOCE模型基于大约2个月的观测期，已经显示出GRACE模型在150到180阶度的光谱范围内有相当大的改进。更长的观察期约8个月，更重要的是可以说明在光谱范围内直至残缺度和阶数为224的改进。但是，对于高达250的度数，相对于GRACE和地面数据的组合模型，GOCE模型的质量仍然下降。

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